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description the a1120, a1121, a1122, a1123, and a1125 hall-effect unipolar switches are extremely temperature-stable and stress-resistant sensor ics, especially suited for operation over extended temperature ranges to 150c. superior high- temperature performance is made possible through dynamic offset cancellation, which reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. each device includes on a single silicon chip a voltage regulator, hall-voltage generator, small-signal amplifier, chopper stabilization, schmitt trigger, and a short-circuit protected open-drain output to sink up to 25 ma. an on-board regulator permits operation with supply voltages of 3 to 24 v. the advantage of operating down to 3 v is that the device can be used in 3 v applications or with additional external resistance in series with the supply pin for greater protection against high-voltage transient events. for the a1120, a1121, a1122, and a1123, a south pole of sufficient strength turns the output on. removal of the magnetic field turns the output off. the a1125 is complementary, in that for these devices, a south pole turns the a1125 output off, and removal of the magnetic field turns the output on. two package styles provide a magnetically optimized package for most applications. package type lh is a modified sot23w, surface-mount package, while ua is a three-lead ultra-mini sip for through-hole mounting. each package type is lead (pb) free (suffix, Ct), with a 100% matte-tin-plated leadframe. a1120-ds, rev. 16 features and benefits ? aec-q100 automotive qualified ? unipolar switchpoints ? resistant to physical stress ? superior temperature stability ? output short-circuit protection ? operation from unregulated supply ? reverse-battery protection ? solid-state reliability ? small package sizes chopper-stabilized precision hall-effect switches packages: functional block diagram not to scale a1120, a1121, a1122, a1123, and a1125 3-pin sot23w (suffix lh) (a1121, a1122, a1123, and a1125) (a1120) 3-pin sip (suffix ua) r egu l a to r gn d vc c vout co ntro l cu rre nt l i mit dyna mic o ffse t ca nce l l a ti on s a m p le an d h o ld to all subcircuits am p low-pass filter
2 selection guide part number packing 1 mounting ambient, t a switchpoints (typ.) output in south (positive) magnetic field b op b rp a1120elhlx-t 13-in. reel, 10000 pieces/reel 3-pin sot23w surface mount C40oc to 85oc 35 25 on (logic low) a1120elhlt-t 2 7-in. reel, 3000 pieces/reel 3-pin sot23w surface mount a1120eua-t bulk, 500 pieces/bag 3-pin sip through hole a1120llhlx-t 13-in. reel, 10000 pieces/reel 3-pin sot23w surface mount C40oc to 150oc a1120llhlt-t 2 7-in. reel, 3000 pieces/reel 3-pin sot23w surface mount a1120lua-t bulk, 500 pieces/bag 3-pin sip through hole a1121elhlx-t 13-in. reel, 10000 pieces/reel 3-pin sot23w surface mount C40oc to 85oc 95 70 a1121elhlt-t 2 7-in. reel, 3000 pieces/reel 3-pin sot23w surface mount a1121eua-t bulk, 500 pieces/bag 3-pin sip through hole a1121llhlx-t 13-in. reel, 10000 pieces/reel 3-pin sot23w surface mount C40oc to 150oc a1121llhlt-t 2 7-in. reel, 3000 pieces/reel 3-pin sot23w surface mount a1121lua-t bulk, 500 pieces/bag 3-pin sip through hole a1122elhlx-t 13-in. reel, 10000 pieces/reel 3-pin sot23w surface mount C40oc to 85oc 150 125 a1122elhlt-t 2 7-in. reel, 3000 pieces/reel 3-pin sot23w surface mount a1122eua-t bulk, 500 pieces/bag 3-pin sip through hole a1122llhlx-t 13-in. reel, 10000 pieces/reel 3-pin sot23w surface mount C40oc to 150oc a1122llhlt-t 2 7-in. reel, 3000 pieces/reel 3-pin sot23w surface mount a1122lua-t bulk, 500 pieces/bag 3-pin sip through hole a1123llhlx-t 13-in. reel, 10000 pieces/reel 3-pin sot23w surface mount C40oc to 150oc 280 225 a1123llhlt-t 2 7-in. reel, 3000 pieces/reel 3-pin sot23w surface mount a1123lua-t bulk, 500 pieces/bag 3-pin sip through hole a1125elhlx-t 13-in. reel, 10000 pieces/reel 3-pin sot23w surface mount C40oc to 85oc 35 25 off (logic high) a1125elhlt-t 2 7-in. reel, 3000 pieces/reel 3-pin sot23w surface mount a1125eua-t bulk, 500 pieces/bag 3-pin sip through hole a1125llhlx-t 13-in. reel, 10000 pieces/reel 3-pin sot23w surface mount C40oc to 150oc a1125llhlt-t 2 7-in. reel, 3000 pieces/reel 3-pin sot23w surface mount a1125lua-t bulk, 500 pieces/bag 3-pin sip through hole 1 contact allegro for additional packing options. 2 available through authorized allegro distributors only. chopper-stabilized precision hall-effect switches a1120, a1121, a1122, a1123, and a1125 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
3 absolute maximum ratings characteristic symbol notes rating units forward supply voltage v cc 26.5 v reverse supply voltage v rcc C30 v output off voltage v out 26 v continuous output current i out 25 ma reverse output current i rout C50 ma operating ambient temperature t a range e C40 to 85 oc range l C40 to 150 oc maximum junction temperature t j (max) 165 oc storage temperature t stg C65 to 170 oc pin-out diagrams terminal list name description number package lh package ua vcc connects power supply to chip 1 1 vout output from circuit 2 3 gnd ground 3 2 1 3 2 gnd vout vcc package ua package lh 1 2 3 gnd vout vcc chopper-stabilized precision hall-effect switches a1120, a1121, a1122, a1123, and a1125 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
4 electrical characteristics: valid over full operating voltage and ambient temperature ranges, unless otherwise noted characteristics symbol test conditions min. typ. 1 max. unit 2 electrical characteristics forward supply voltage v cc operating, t j < 165c 3 C 24 v output leakage current i outoff a1120 a1121 a1122 a1123 v out = 24 v, b b op C C 10 a output saturation voltage v out(sat) a1120 a1121 a1122 a1123 i out = 20 ma, b > b op C 185 500 mv a1125 i out = 20 ma, b b op 30 C 60 ma a1125 b 3.0 v, b b op (max) + 10 g C C 25 s chopping frequency f c C 800 C khz output rise time 3,4 t r r l = 820 , c s = 20 pf C 0.2 2 s output fall time 3,4 t f r l = 820 , c s = 20 pf C 0.1 2 s supply current i cc(on) a1120 a1121 a1122 a1123 v cc = 12 v, b > b op C C 4 ma a1125 v cc = 12 v, b b op C C 4 ma reverse supply current i rcc v rcc = C30 v C C C5 ma supply zener clamp voltage v z i cc = 5 ma; t a = 25c 28 C C v zener impedance i z i cc = 5 ma; t a = 25c C 50 C continued on the next page chopper-stabilized precision hall-effect switches a1120, a1121, a1122, a1123, and a1125 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
5 electrical characteristics (continued): valid over full operating voltage and ambient temperature ranges, unless otherwise noted characteristics symbol test conditions min. typ. 1 max. unit 2 magnetic characteristics operate point b op a1120 C 35 50 g a1121 50 95 135 g a1122 120 150 200 g a1123 205 280 355 g a1125 C 35 50 g release point b rp a1120 5 25 C g a1121 40 70 110 g a1122 110 125 190 g a1123 150 225 300 g a1125 5 25 C g hysteresis b hys a1120 (b op C b rp ) C 10 C g a1121 10 25 42 g a1122 10 25 42 g a1123 30 55 80 g a1125 C 10 C g 1 typical data are are at t a = 25c and v cc = 12 v, and are for initial design estimations only. 2 1 g (gauss) = 0.1 mt (millitesla). 3 guaranteed by device design and characterization. 4 c s = oscilloscope probe capacitance. chopper-stabilized precision hall-effect switches a1120, a1121, a1122, a1123, and a1125 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
6 thermal characteristics: may require derating at maximum conditions; see application information characteristic symbol test conditions value units package thermal resistance r ja package lh, 1-layer pcb with copper limited to solder pads 228 oc/w package lh, 2-layer pcb with 0.463 in. 2 of copper area each side connected by thermal vias 110 oc/w package ua, 1-layer pcb with copper limited to solder pads 165 oc/w 6 7 8 9 2 3 4 5 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 20 40 60 80 100 120 140 160 180 temperature (oc) maximum allowable v cc (v) t j(max) = 165oc; i cc = i cc(max) power derating curve (r ja = 228 oc/w) package lh, 1-layer pcb (r ja = 110 oc/w) package lh, 2-layer pcb (r ja = 165 oc/w) package ua, 1-layer pcb v cc(min) v cc(max) 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 20 40 60 80 100 120 140 160 180 temperature (c) power dissipation, p d (mw) power dissipation versus ambient temperature (r ja = 165 oc/w) package ua, 1-layer pcb (r ja = 228 oc/w) package lh, 1-layer pcb (r ja = 110 oc/w) package lh, 2-layer pcb chopper-stabilized precision hall-effect switches a1120, a1121, a1122, a1123, and a1125 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
7 characteristic performance a1120, a1121, a1122, a1123, and a1125 electrical characteristics 0 0 . 5 1 . 0 1 . 5 2 . 0 2 . 5 3 . 0 3 . 5 4 . 0 4 . 5 5 . 0 5 . 5 6 . 0 2 6 1 0 1 4 1 8 2 2 2 6 0 0 . 5 1 . 0 1 . 5 2 . 0 2 . 5 3 . 0 3 . 5 4 . 0 4 . 5 5 . 0 5 . 5 6 . 0 - 6 0 - 4 0 - 2 0 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 1 4 0 1 6 0 0 0 . 5 1 . 0 1 . 5 2 . 0 2 . 5 3 . 0 3 . 5 4 . 0 4 . 5 5 . 0 5 . 5 6 . 0 - 6 0 - 4 0 - 2 0 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 1 4 0 1 6 0 0 0 . 5 1 . 0 1 . 5 2 . 0 2 . 5 3 . 0 3 . 5 4 . 0 4 . 5 5 . 0 5 . 5 6 . 0 2 6 1 0 1 4 1 8 2 2 2 6 0 5 0 1 0 0 1 5 0 2 0 0 2 5 0 3 0 0 - - - 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 1 4 0 1 6 0 0 5 0 1 0 0 1 5 0 2 0 0 2 5 0 3 0 0 2 6 1 0 1 4 1 8 2 2 2 6 6 0 4 0 2 0 average supply current (on) versus average supply voltage average supply current (on) versus ambient temperature average supply current (off) versus average supply voltage average supply current (off) versus ambient temperature average output saturation voltage versus supply voltage average output saturation voltage versus ambient temperature t a (c) i cc(av) (ma) i cc(av) (ma) i cc(av) (ma) i cc(av) (ma) v out(sat) (v) v out(sat) (v) v cc (v) t a (c) v cc (v) t a (c) v cc (v) t a (c) ?40 25 150 v cc (v) 3.0 12 24 v cc (v) 3.0 3.8 4.2 12 24 a112x* *a1120, a1121, a1122, and a1125 a1123 v cc (v) 3.0 12 24 a112x* *a1120, a1121, a1122, and a1125 a1123 a112x* *a1120, a1121, a1122, and a1125 a1123 t a (c) ?40 25 150 a112x* *a1120, a1121, a1122, and a1125 a1123 t a (c) ?40 25 150 a112x* *a1120, a1121, a1122, and a1125 a1123 a112x* *a1120, a1121, a1122, and a1125 a1123 chopper-stabilized precision hall-effect switches a1120, a1121, a1122, a1123, and a1125 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
8 a1120 and a1125 magnetic characteristics 0 5 1 0 1 5 2 0 2 5 3 0 3 5 4 0 4 5 5 0 - 6 0 - 4 0 - 2 0 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 1 4 0 1 6 0 0 5 1 0 1 5 2 0 2 5 3 0 3 5 4 0 4 5 5 0 - 6 0 - 4 0 - 2 0 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 1 4 0 1 6 0 0 2 4 6 8 1 0 1 2 1 4 1 6 1 8 2 0 - 6 0 - 4 0 - 2 0 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 1 4 0 1 6 0 0 5 1 0 1 5 2 0 2 5 3 0 3 5 4 0 4 5 5 0 2 6 1 0 1 4 1 8 2 2 2 6 0 5 1 0 1 5 2 0 2 5 3 0 3 5 4 0 4 5 5 0 2 6 1 0 1 4 1 8 2 2 2 6 0 2 4 6 8 1 0 1 2 1 4 1 6 1 8 2 0 2 6 1 0 1 4 1 8 2 2 2 6 average operate point versus average supply voltage average operate point versus ambient temperature average release point versus average supply voltage average release point versus ambient temperature average switchpoint hysteresis versus supply voltage average switchpoint hysteresis versus ambient temperature t a (c) b op (g) b op (g) b rp (g) b rp (g) b hys (g) b hys (g) v cc (v) t a (c) v cc (v) t a (c) v cc (v) v cc (v) 3.0 24 v cc (v) 3.0 24 v cc (v) 3.0 24 t a (c) ?40 25 150 t a (c) ?40 25 150 t a (c) ?40 25 150 chopper-stabilized precision hall-effect switches a1120, a1121, a1122, a1123, and a1125 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
9 a1121 magnetic characteristics - 60 - 40 - 20 0 20 40 60 80 100 120 140 160 2 6 10 14 18 22 26 26 - 60 - 40 - 20 0 20 40 60 80 100 120 140 160 2 6 10 14 18 22 - 60 - 40 - 20 0 20 40 60 80 100 120 140 160 2 6 10 14 18 22 26 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 1 1 0 1 0 1 5 2 0 2 5 3 0 3 5 4 0 50 6 0 7 0 8 0 9 0 1 0 0 1 1 0 1 2 0 1 3 0 1 4 0 50 6 0 7 0 8 0 9 0 1 0 0 1 1 0 1 2 0 1 3 0 1 4 0 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 1 1 0 1 0 1 5 2 0 2 5 3 0 3 5 4 0 average operate point versus average supply voltage average operate point versus ambient temperature average release point versus average supply voltage average release point versus ambient temperature average switchpoint hysteresis versus supply voltage average switchpoint hysteresis versus ambient temperature t a (c) b op (g) b op (g) b rp (g) b rp (g) b hys (g) b hys (g) v cc (v) t a (c) v cc (v) t a (c) v cc (v) v cc (v) 3.0 12 24 v cc (v) 3.0 12 24 v cc (v) 3.0 12 24 t a (c) ?40 25 150 t a (c) ?40 25 150 t a (c) ?40 25 150 chopper-stabilized precision hall-effect switches a1120, a1121, a1122, a1123, and a1125 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
10 a1122 magnetic characteristics - 60 - 40 - 20 0 20 40 60 80 100 120 140 160 2 6 10 14 18 22 26 26 - 60 - 40 - 20 0 20 40 60 80 100 120 140 160 2 6 10 14 18 22 - 60 - 40 - 20 0 20 40 60 80 100 120 140 160 2 6 10 14 18 22 26 1 0 1 5 2 0 2 5 3 0 3 5 4 0 200 190 180 170 160 150 140 130 120 200 190 180 170 160 150 140 130 120 190 180 170 160 150 140 130 120 110 190 180 170 160 150 140 130 120 110 1 0 1 5 2 0 2 5 3 0 3 5 4 0 average operate point versus average supply voltage average operate point versus ambient temperature average release point versus average supply voltage average release point versus ambient temperature average switchpoint hysteresis versus supply voltage average switchpoint hysteresis versus ambient temperature t a (c) b op (g) b op (g) b rp (g) b rp (g) b hys (g) b hys (g) v cc (v) t a (c) v cc (v) t a (c) v cc (v) v cc (v) 3.0 12 24 v cc (v) 3.0 12 24 v cc (v) 3.0 12 24 t a (c) ?40 25 150 t a (c) ?40 25 150 t a (c) ?40 25 150 chopper-stabilized precision hall-effect switches a1120, a1121, a1122, a1123, and a1125 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
11 a1123 magnetic characteristics 355 35 0 305 280 255 230 205 355 35 0 305 280 255 230 205 - 6 0 - 4 0 - 2 0 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 1 4 0 1 6 0 - 6 0 - 4 0 - 2 0 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 1 4 0 1 6 0 - 6 0 - 4 0 - 2 0 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 1 4 0 1 6 0 2 6 1 0 1 4 1 8 2 2 2 6 2 6 1 0 1 4 1 8 2 2 2 6 2 6 1 0 1 4 1 8 2 2 2 6 300 275 250 225 200 175 150 300 275 250 225 200 175 150 80 75 70 65 60 55 50 45 40 35 30 80 75 70 65 60 55 50 45 40 35 30 average operate point versus average supply voltage average operate point versus ambient temperature average release point versus average supply voltage average release point versus ambient temperature average switchpoint hysteresis versus supply voltage average switchpoint hysteresis versus ambient temperature t a (c) b op (g) b op (g) b rp (g) b rp (g) b hys (g) b hys (g) v cc (v) t a (c) v cc (v) t a (c) v cc (v) t a (c) ?40 25 150 t a (c) ?40 25 150 t a (c) ?40 25 150 t a (c) 3 12 24 t a (c) 3 12 24 t a (c) 3 12 24 chopper-stabilized precision hall-effect switches a1120, a1121, a1122, a1123, and a1125 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
12 c byp a112x vout gnd 0.1 f vcc output r l v s operation the output of the a1120, a1121, a1122, and a1123 devices switches low (turns on) when a magnetic field perpendicular to the hall element exceeds the operate point threshold, b op (see panel a of figure 1). when the magnetic field is reduced below the release point, b rp , the device output goes high (turns off). the output of the a1125 devices switches high (turns off) when a magnetic field perpendicular to the hall element exceeds the operate point threshold, b op (see panel b of figure 1). when the magnetic field is reduced below the release point, b rp , the device output goes low (turns on). after turn-on, the output voltage is v out(sat) . the output tran - sistor is capable of sinking current up to the short circuit current limit, i om , which is a minimum of 30 ma. the difference in the magnetic operate and release points is the hysteresis, b hys , of the device. this built-in hysteresis allows clean switching of the output even in the presence of external mechanical vibration and electrical noise. powering-on the device in the hysteresis range (less than b op and higher than b rp ) will give an indeterminate output state. the correct state is attained after the first excursion beyond b op or b rp . applications it is strongly recommended that an external bypass capacitor be connected (in close proximity to the hall element) between the supply and ground of the device to reduce external noise in the application. as is shown in panel b of figure 1, a 0.1 f capacitor is typical. extensive applications information for hall effect devices is available in: ? hall-effect ic applications guide , application note 27701 ? guidelines for designing subassemblies using hall-effect devices , application note 27703.1 ? soldering methods for allegros products C smt and through- hole , application note 26009 all are provided on the allegro web site, www.allegromicro.com. figure 1. device switching behavior. in panels a and b, on the horizontal axis, the b+ direction indicates increasing south polarity magnetic field strength. this behavior can be exhibited when using an electrical circuit such as that shown in panel c. (a) (b) (c) functional description b op b rp b hys v cc v out v out(sat) switch to low switch to high b+ v+ 0 0 b op b rp b hys v cc v out v out(sat) switch to low switch to high b+ v+ 0 0 chopper-stabilized precision hall-effect switches a1120, a1121, a1122, a1123, and a1125 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
13 a m p r e g u l a t o r c l o c k / l o g i c h a l l e l e m e n t s a m p l e a n d h o l d l o w - p a ss f i l t e r chopper stabilization technique when using hall effect technology, a limiting factor for switchpoint accuracy is the small signal voltage developed across the hall element. this voltage is disproportionally small relative to the offset that can be produced at the output of the hall ele - ment. this makes it difficult to process the signal while main - taining an accurate, reliable output over the specified operating temperature and voltage ranges. chopper stabilization is a unique approach used to minimize hall offset on the chip. the patented allegro technique, namely dynamic quadrature offset cancellation, removes key sources of the output drift induced by thermal and mechanical stresses. this offset reduction technique is based on a signal modulation- demodulation process. the undesired offset signal is separated from the magnetic field-induced signal in the frequency domain, through modulation. the subsequent demodulation acts as a modulation process for the offset, causing the magnetic field induced signal to recover its original spectrum at baseband, while the dc offset becomes a high-frequency signal. the magnetic sourced signal then can pass through a low-pass filter, while the modulated dc offset is suppressed. this configuration is illus - trated in figure 2. the chopper stabilization technique uses a 400 khz high fre - quency clock. for demodulation process, a sample and hold technique is used, where the sampling is performed at twice the chopper frequency (800 khz). this high-frequency operation allows a greater sampling rate, which results in higher accuracy and faster signal-processing capability. this approach desensi - tizes the chip to the effects of thermal and mechanical stresses, and produces devices that have extremely stable quiescent hall output voltages and precise recoverability after temperature cycling. this technique is made possible through the use of a bicmos process, which allows the use of low-offset, low-noise amplifiers in combination with high-density logic integration and sample-and-hold circuits. the repeatability of magnetic field-induced switching is affected slightly by a chopper technique. however, the allegro high frequency chopping approach minimizes the affect of jitter and makes it imperceptible in most applications. applications that are more likely to be sensitive to such degradation are those requiring precise sensing of alternating magnetic fields; for example, speed sensing of ring-magnet targets. for such applications, allegro recommends its digital device families with lower sensitivity to jitter. for more information on those devices, contact your allegro sales representative. figure 2. model of chopper stabilization technique chopper-stabilized precision hall-effect switches a1120, a1121, a1122, a1123, and a1125 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
14 power derating the device must be operated below the maximum junction temperature of the device, t j(max) . under certain combinations of peak conditions, reliable operation may require derating supplied power or improving the heat dissipation properties of the appli - cation. this section presents a procedure for correlating factors affecting operating t j . (thermal data is also available on the allegro microsystems website.) the package thermal resistance, r ja , is a figure of merit sum - marizing the ability of the application and the device to dissipate heat from the junction (die), through all paths to the ambient air. its primary component is the effective thermal conductivity, k, of the printed circuit board, including adjacent devices and traces. radiation from the die through the device case, r jc , is relatively small component of r ja . ambient air temperature, t a , and air motion are significant external factors, damped by overmolding. the effect of varying power levels (power dissipation, p d ), can be estimated. the following formulas represent the fundamental relationships used to estimate t j , at p d . p d = v in i in (1) t = p d r ja (2) t j = t a + t (3) for example, given common conditions such as: t a = 25c, v cc = 12 v, i cc = 1.6 ma, and r ja = 165 c/w, then: p d = v cc i cc = 12 v 1.6 ma = 19 mw t = p d r ja = 19 mw 165 c/w = 3c t j = t a + t = 25c + 3c = 28c a worst-case estimate, p d(max) , represents the maximum allow - able power level (v cc(max) , i cc(max) ), without exceeding t j(max) , at a selected r ja and t a . example : reliability for v cc at t a = 150c, package lh, using a minimum-k pcb. observe the worst-case ratings for the device, specifically: r ja = 228c/w, t j (max) = 165c, v cc (max) = 24 v, and i cc (max) = 4 ma. calculate the maximum allowable power level, p d (max). first, invert equation 3: t max = t j (max) C t a = 165 c C 150 c = 15 c this provides the allowable increase to t j resulting from internal power dissipation. then, invert equation 2: p d (max) = t max r ja = 15c 228 c/w = 66 mw finally, invert equation 1 with respect to voltage: ? v cc(est) = p d (max) i cc (max) = 66 mw 4 ma = 16.5 v the result indicates that, at t a , the applicati on and device can dissipate adequate amounts of heat at voltages v cc(est) . compare v cc(est) to v cc (max). if v cc(est) v cc (max), then reli - able operation between v cc(est) and v cc (max) requires enhanced r ja . if v cc(est) v cc (max), then operation between v cc(est) and v cc (max) is reliable under these conditions. chopper-stabilized precision hall-effect switches a1120, a1121, a1122, a1123, and a1125 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
15 0.55 ref gauge plane seating plane 0.25 bsc 0.95 bsc 0.95 1.00 0.70 2.40 2 1 a active area depth, 0.28 mm ref b c b reference land pattern layout all pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and pcb layout tolerances branding scale and appearance at supplier discretion a pcb layout reference view branded face c standard branding reference view n = last two digits of device part number t = temperature code (letter) 1 nnt n = last three digits of device part number 1 nnn 2.90 +0.10 ?0.20 44 8x 10 ref 0.180 +0.020 ?0.053 0.05 +0.10 ?0.05 0.25 min 1.91 +0.19 ?0.06 2.98 +0.12 ?0.08 1.00 0.13 0.40 0.10 for reference only; not for tooling use (reference dwg. 802840) dimensions in millimeters dimensions exclusive of mold flash, gate burrs, and dambar protrusions exact case and lead configuration at supplier discretion within limits shown d hall element, not to scale d d d 1.49 0.96 3 package lh, 3-pin (sot-23w) chopper-stabilized precision hall-effect switches a1120, a1121, a1122, a1123, and a1125 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
16 2 3 1 0.79 ref 1.27 nom 2.16 max 0.51 ref 45 c 45 b e e e 2.04 1.44 gate burr area a b c dambar removal protrusion (6x) a d e d branding scale and appearance at supplier discretion hall element, not to scale active area depth, 0.50 mm ref for reference only; not for tooling use (reference dwg-9049) dimensions in millimeters dimensions exclusive of mold flash, gate burrs, and dambar protrusions exact case and lead configuration at supplier discretion within limits shown standard branding reference view = supplier emblem n = last two digits of device part number t = temperature code nnt 1 mold ejector pin indent branded face 4.09 +0.08 ?0.05 0.41 +0.03 ?0.06 3.02 +0.08 ?0.05 0.43 +0.05 ?0.07 15.75 0.51 1.52 0.05 package ua, 3-pin sip (a1120) chopper-stabilized precision hall-effect switches a1120, a1121, a1122, a1123, and a1125 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
17 package ua, 3-pin sip (a1121, a1122, a1123, and a1125) 2 3 1 1.27 nom 1.02 max 45 45 c 1.52 0.05 b gate and tie bar burr area a b c dambar removal protrusion (6x) a d e e e 1.44 2.04 e active area depth, 0.50 mm ref branding scale and appearance at supplier discretion hall element (not to scale) for reference only; not for tooling use (reference dwg-9065) dimensions in millimeters dimensions exclusive of mold flash, gate burrs, and dambar protrusions exact case and lead configuration at supplier discretion within limits shown mold ejector pin indent d standard branding reference view = supplier emblem n = last three digits of device part number nnn 1 0.41 +0.03 ?0.06 0.43 +0.05 ?0.07 14.99 0.25 4.09 +0.08 ?0.05 3.02 +0.08 ?0.05 0.79 ref 10 branded face chopper-stabilized precision hall-effect switches a1120, a1121, a1122, a1123, and a1125 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
18 revision history revision revision date description of revision 15 september 3, 2013 update product offerings update ua package drawing 16 september 16, 2015 added aec-q100 qualification under features and benefits copyright ?2015, allegro microsystems, llc allegro microsystems, llc reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. before placing an order, the user is cautioned to verify that the information being relied upon is current. allegros products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of allegros product can reasonably be expected to cause bodily harm. the information included herein is believed to be accurate and reliable. however, allegro microsystems, llc assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. chopper-stabilized precision hall-effect switches a1120, a1121, a1122, a1123, and a1125 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com

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