hall-effect latches for high-temperature operation these hall-effect latches are extremely temperature-stable and stress- resistant sensors especially suited for operation over extended temperature ranges to +150 c. superior high-temperature performance is made possible through a novel schmitt trigger circuit that maintains operate and release point symmetry by compensating for temperature changes in the hall ele- ment. additionally, internal compensation provides magnetic switch points that become more sensitive with temperature, hence offsetting the usual degradation of the magnetic field with temperature. the symmetry capability makes these devices ideal for use in pulse-counting applications where duty cycle is an important parameter. the four basic devices (3185, 3187, 3188, and 3189) are identical except for magnetic switch points. each device includes on a single silicon chip a voltage regulator, qua- dratic hall-voltage generator, temperature compensation circuit, signal amplifier, schmitt trigger, and a buffered open-collector output to sink up to 25 ma. the on-board regulator permits operation with supply voltages of 3.8 to 24 volts. the first character of the part number suffix determines the device operating temperature range. suffix eC is for -40 c to +85 c, and suffix lC is for -40 c to +150 c. three package styles provide a magnetically optimized package for most applications. suffix Clt is a miniature sot- 89/to-243aa transistor package for surface-mount applications; suffix Cu is a three-lead plastic mini-sip, while suffix Cua is a three-lead ultra-mini- sip. data sheet 27609.2a* absolute maximum ratings at t a = +25 c supply voltage, v cc ............................ 30 v reverse battery voltage, v rcc ........... -30 v magnetic flux density, b ........... unlimited output off voltage, v out .................. 30 v reverse output voltage, v out .......... -0.5 v continuous output current, i out ..... 25 ma operating temperature range, t a suffix eC ................... -40 c to +85 c suffix lC ................. -40 c to +150 c storage temperature range, t s ............................... -65 c to +170 c features symmetrical switch points superior temperature stability operation from unregulated supply open-collector 25 ma output reverse battery protection activate with small, commercially available permanent magnets solid-state reliability small size resistant to physical stress pinning is shown viewed from branded side. always order by complete part number: the prefix a + the basic four-digit part number + a suffix to indicate operating temperature range + a suffix to indicate package style, e.g., a3185elt . 3185 thru 3189 dwg. ph-003a 1 supply v cc ground 3 2 output x devices in the u package are last-time buy orders accepted only until april 18, 2002
3185 thru 3189 hall-effect latches for high-temperature operation 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 electrical characteristics over operating temperature range, at v cc = 12 v. limits characteristic symbol test conditions min. typ. max. units supply voltage v cc operating 3.8 24 v output saturation voltage v out(sat) i out = 20 ma, b > b op 175 400 mv output leakage current i off v out = 24 v, b < b rp 0.05 5.0 a supply current i cc b < b rp (output off) 4.75 8.0 ma b > b op (output on) 5.7 ma output rise time t r r l = 820 ? , c l = 20 pf 100 ns output fall time t f r l = 820 ? , c l = 20 pf 100 ns magnetic characteristics in gauss over operating supply voltage range. part numbers* a3185 a3187 a3188 a3189 characteristic min. max. min. max. min. max. min. max. b op at t a = 25 c 170 270 50 150 100 180 50 230 over operating temp. range 140 300 50 175 80 200 50 250 b rp at t a = 25 c -270 -170 -150 -50 -180 -100 -230 -50 over operating temp. range -300 -140 -175 -50 -200 -80 -250 -50 b hys at t a = 25 c 340 540 100 300 200 360 100 460 over operating temp. range 280 600 100 350 160 400 100 500 functional block diagram notes: b op = operate point (output turns on); b rp = release point (output turns off); b hys = hysteresis (b op - b rp ). as used here, negative flux densities are defined as less than zero (algebraic convention). *complete part number includes a suffix to identify operating temperature range (e or l) and package type ( lt, u, or ua). v cc x reg. dwg. fh-005-3 ground output 1 3 2 copyright ? 1995, 2002 allegro microsystems, inc.
3185 thru 3189 hall-effect latches for high-temperature operation www.allegromicro.com typical operating characteristics a3185* switch points a3187* switch points * complete part number includes a suffix denoting operating temperature range (e or l) and package type (lt, u, or ua). output saturation voltage supply current supply current operate point 0 50 100 ambient temperature in ? -50 dwg. gh-027 switch point in gauss 0 50 100 -50 -100 operate point release point v = 12 v cc 150 150 -150 -25 25 75 125 0 25 50 75 100 ambient temperature in c -50 dwg. gh-028 125 -25 v = 12 v cc b b rp supply current in ma 7.0 6.0 5.0 4.0 b b op 150 0255075 100 300 0 ambient temperature in c 200 100 -50 dwg. gh-029 saturation voltage in mv 150 -25 125 i = 20 ma v = 4.5?4 v out cc 10 15 20 25 supply voltage in volts 0 dwg. gh-037 5 change in operate point in gauss -5.0 0 5.0 10 15 20 t = +25 c a 0 50 100 ambient temperature in c -50 dwg. gh-026 switch point in gauss 0 100 200 -100 -200 operate point release point v = 12 v cc 150 300 -300 -25 25 75 125 10 15 20 25 supply voltage in volts 0 dwg. gh-030 5 supply current in ma 0 2.0 4.0 6.0 8.0 10 b b op b b rp t = +25 c a
3185 thru 3189 hall-effect latches for high-temperature operation 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 sensor locations ( 0.005 [0.13 mm] die placement) allegro package designators lt 1 3 2 dwg. mh-008-4c 0.0305" 0.775 mm nom active area depth 0.050" 1.27 mm 0.090" 2.27 mm a package designator u 1 3 2 dwg. mh-002-7c 0.0165" 0.42 mm nom branded surface active area depth 0.077" 1.96 mm 0.092" 2.33 mm a package designators ua and "ua-tl" 1 3 2 dwg. mh-011-4c 0.0195" 0.50 mm nom branded surface active area depth 0.083" 2.10 mm 0.060" 1.51 mm a the simplest form of magnet that will operate these devices is a ring magnet, as shown below. other methods of operation are possible. dwg. a-11,899 operation in operation, the output transistor is off until the strength of the mag- netic field perpendicular to the surface of the chip exceeds the threshold or operate point (b op ). when the field strength exceeds b op , the output transis- tor switches on and is capable of sinking 25 ma of current. the output transistor switches off when magnetic field reversal results in a magnetic flux density below the off threshold (b rp ). this is illustrated in the transfer characteristics graph (a3187* shown). note that the device latches; that is, a south pole of sufficient strength will turn the device on. removal of the south pole will leave the device on. the presence of a north pole of sufficient strength is required to turn the device off. powering up in the absence of a magnetic field (less than b op and higher than b rp ) will allow an indeterminate output state. the correct state is warranted after the first excursion beyond b op or b rp . applications information extensive applications information on magnets and hall-effect sensors is also available in the allegro integrated and discrete semiconductors data book or application note 27701. 30 v max 0+b 0 output voltage in volts flux density dwg. gh-034-4 -b rp b v out(sat) bb v op b although sensor location is accurate to three sigma for a particular design, product improve- ments may result in small changes to sensor location.
3185 thru 3189 hall-effect latches for high-temperature operation www.allegromicro.com notes: 1. tolerances on package height and width represent allowable mold offsets. dimensions given are measured at the widest point (parting line). 2. exact body and lead configuration at vendors option within limits shown. 3. height does not include mold gate flash. 4. recommended minimum pwb hole diameter to clear transition area is 0.035" (0.89 mm). 5. where no tolerance is specified, dimension is nominal. 6. minimum lead length was 0.500" (12.70 mm). if existing product to the original specifications is not acceptable, contact sales office before ordering. package designator u dimensions in inches (controlling dimensions) dimensions in millimeters (for reference only) dwg. mh-003e in 0.063 0.059 0.018 0.0173 0.0138 0.0189 0.0142 0.050 1 2 3 0.100 45 see note 0.183 0.178 0.181 0.176 0.600 0.560 0.086 max dwg. mh-003e mm 1.60 1.50 0.46 0.44 0.35 0.48 0.36 1.27 1 2 3 2.54 45 see note 4.65 4.52 4.60 4.47 15.24 14.23 2.18 max devices in the u package are last-time buy orders accepted only until april 18, 2002
3185 thru 3189 hall-effect latches for high-temperature operation 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 surface-mount lead form (suffix -tl) notes: 1. tolerances on package height and width represent allowable mold offsets. dimensions given are measured at the widest point (parting line). 2. exact body and lead configuration at vendors option within limits shown. 3. height does not include mold gate flash. 4. recommended minimum pwb hole diameter to clear transition area is 0.035" (0.89 mm). 5. where no tolerance is specified, dimension is nominal. dimensions in inches (controlling dimensions) dimensions in millimeters (for reference only) package designator ua 0.095 0.005 0.020 min flat dwg. mh-015 in 0.004 max 0.002 max 0 8 2.41 0.13 0.51 min flat dwg. mh-015 mm 0.10 max 0.051 max 0 8 dwg. mh-014e mm 4.17 4.04 1.57 1.47 0.44 0.35 1.27 bsc 45 16.26 15.24 0.48 0.36 2.16 max 45 0.79 1 2 3 3.10 2.97 see note dwg. mh-014e in 0.164 0.159 0.062 0.058 0.0173 0.0138 0.050 bsc 45 0.640 0.600 0.0189 0.0142 0.085 max 45 0.031 1 2 3 0.122 0.117 see note
3185 thru 3189 hall-effect latches for high-temperature operation www.allegromicro.com note: exact body and lead configuration at vendors option within limits shown. package designator lt (sot-89/to-243aa) dimensions in inches (for reference only) dimensions in millimeters (controlling dimensions) dwg. ma-009-3a in 1 23 0.072 0.064 0.167 0.155 0.059 bsc 0.0189 0.0142 0.047 0.035 0.102 0.090 0.063 0.055 0.0173 0.0138 0.090 0.084 0.0221 0.0173 0.118 bsc 0.181 0.173 dwg. ma-009-3a mm 1 23 4.60 4.40 1.83 1.62 4.25 3.94 1.50 bsc 0.48 0.36 1.20 0.89 2.60 2.29 1.60 1.40 0.44 0.35 2.29 2.13 0.56 0.44 3.00 bsc the products described herein are manufactured under one or more of the following u.s. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending. allegro microsystems, inc. 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. allegro products are not authorized for use as critical components in life-support appliances, devices, or systems without express written approval. the information included herein is believed to be accurate and reliable. how- ever, allegro microsystems, inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties that may result from its use.
3185 thru 3189 hall-effect latches for high-temperature operation 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 hall-effect sensors latching hall-effect digital switches partial operate release hysteresis replaces part point (g) point (g) (g) oper. and number over oper. voltage & temp. range temp. packages comments ugn3175 15 to 180 -180 to -15 >80 (typ 180) s lt, ua ugn3177 25 to 150 -150 to -25 >50 (typ 180) s lt, ua a3185x 140 to 300 -300 to -140 280 to 600 e/l lt, ua a3187x 50 to 175 -175 to -50 100 to 350 e/l lt, ua 3077, 3175, 3177 a3188x 80 to 200 -200 to -80 160 to 400 e/l lt, ua a3189x 50 to 250 -250 to -50 100 to 500 e/l lt, ua 3075, 3076 a3280x 5 to 40 -40 to -5 10 to 80 e/l lh, lt, ua chopper stabilized a3281x 15 to 90 -90 to -15 30 to 180 e/l lh, lt, ua chopper stabilized a3283x 100 to 180 -180 to -100 <400 (typ 300) e/l lh, lt, ua chopper stabilized protected latching hall-effect digital switches partial operate release hysteresis part point (g) point (g) (g) oper. number over oper. voltage & temp. range temp. packages comments a3195x 40 to 200 -200 to -40 >110 (typ 220) e, l u, lt active pulldown a3197x 40 to 200 -200 to -40 >110 (typ 230) e, l u, lt open-collector output notes: 1) typical data is at t a = +25 c and nominal operating voltage. 2) x = operating temperature range [suffix letter or (prefix)]: s (ugn) = -20 c to +85 c, e = -40 c to +85 c, j = -40 c to +115 c, k (ugs) = -40 c to +125 c, l (ugl) = -40 c to +150 c.
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