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3240
Suffix `-LT' & `-UA' Pinning
(SOT89/TO-243AA & ultra-min SIP)
CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH
The A3240-- Hall-effect switch is an extremely temperature-stable and stress-resistant sensor 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. The device includes on a single silicon chip a voltage regulator, Hallvoltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a short-circuit protected open-collector output to sink up to 25 mA. A south pole of sufficient strength will turn the output on. An on-board regulator permits operation with supply voltages of 4.2 to 24 volts.
3
Data Sheet 27621.20d
X
PTCT
V
CC
1
2
Three package styles provide a magnetically optimized package for most applications. Package type LH is a modified SOT23W surfacemount package, LT is a miniature SOT89/TO-243AA transistor package for surface-mount applications; while UA is a three-lead ultra-mini-SIP for through-hole mounting. The LH and UA packages are also available in a lead (Pb) free version (suffix, -T) , with a 100% matte tin plated leadframe.
GROUND
SUPPLY
Dwg. PH-003-2
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at TA = +25C Supply Voltage, VCC .......................... 26.5 V Reverse Battery Voltage, VRCC .......... -30 V Magnetic Flux Density, B ............ Unlimited Output OFF Voltage, VOUT .................. 26 V Continuous Output Current, IOUT ......................................... 25 mA* Reverse Output Current, IOUT ......... -50 mA Package Power Dissipation, PD See Graph Junction Temperature, TJ ................ +165C Operating Temperature Range, TA Range `E' ..................... -40C to +85C Range `L'.................... -40C to +150C Storage Temperature Range, TS .............................. -65C to +170C
*Internal current limiting is intended to protect the device from output short circuits.
OUTPUT
FEATURES
Resistant to Physical Stress Superior Temperature Stability Output Short-Circuit Protection Operation From Unregulated Supply Reverse Battery Protection Solid-State Reliability Small Size
3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH
Product Selection Guide
Part Number A3240ELHLT-T A3240EUA-T A3240LLHLT-T A3240LUA-T
1Pb-based
Pb-free1 Yes Yes Yes Yes
Packing2
Mounting
Ambient, TA (C) -40 to 85
BRP(MIN) (G)
BOP(MAX) (G)
7-in. reel, 3000 pieces/reel Surface Mount Bulk, 500 pieces/bag Bulk, 500 pieces/bag SIP through hole SIP through hole 7-in. reel, 3000 pieces/reel Surface Mount
5.0 -40 to 150
50
variants are being phased out of the product line. Certain variants cited in this footnote are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: May 1, 2006. These variants include: A3240ELHLT, A3240ELT, A3240ELTTR, A3240EUA, A3240LLHLT, A3240LLT, A3240LLTTR, and A3240LUA. 2Contact Allegro for additional packing options.
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2
3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH
FUNCTIONAL BLOCK DIAGRAM
SUPPLY
REG.
TO ALL SUBCIRCUITS
DYNAMIC OFFSET CANCELLATION
OUTPUT
LOW-PASS FILTER SAMPLE & HOLD
X
CONTROL
CURRENT LIMIT <1 GROUND
Dwg. FH-020-1
800
ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS
Suffix `-LH' Pinning
(SOT23W)
Suffix "-UA" RJA = 165C/W
700
3
600
500 Suffix "-LH" RJA = 228C/W 400
Suffix "-LT" RJA = 180C/W
X
PTCT
300
V
CC
200 Suffix "E-"
1
2
GROUND
100 Suffix "L-" 0 20 40 60 100 80 120 AMBIENT TEMPERATURE in C 140 160 180
Dwg. PH-003-4
Dwg. GH-046-2D
3
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2000, 2003, 2004 Allegro MicroSystems, Inc.
OUTPUT
SUPPLY
3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH
ELECTRICAL CHARACTERISTICS over operating temperature range.
Limits Characteristic Supply Voltage Range Output Leakage Current Output Saturation Voltage Output Current Limit Power-On Time Chopping Frequency Output Rise Time Output Fall Time Supply Current Symbol VCC IOFF VOUT(SAT) IOM tpo fC tr tf ICC RL = 820 , CL = 20 pF RL = 820 , CL = 20 pF B < BRP, VCC = 12 V B > BOP, VCC = 12 V Reverse Battery Current Zener Voltage Zener Impedance ICC VZ + VD zz + z D VRCC = -30 V ICC = 15 mA, TA = 25C ICC = 15 mA, TA = 25C Test Conditions Operating, TJ < 165C1 VOUT = 24 V, B < BRP IOUT = 20 mA, B > BOP B > BOP VCC > 4.2 V Min. 4.2 - - 30 - - - - - - - 28 - Typ. - - 185 - - 340 0.2 0.1 3.0 4.0 - 32 50 Max. 24 10 500 60 50 - 2.0 2.0 6.0 6.0 -5.0 37 - Units V A mV mA s kHz s s mA mA mA V
NOTES:1. Maximum voltage must be adjusted for power dissipation and junction temperature. 2. BOP = operate point (output turns on); BRP = release point (output turns off). 3. Typical Data is at TA = +25C and VCC = 12 V and is for design information only.
MAGNETIC CHARACTERISTICS over operating supply voltage and temperature ranges.
Limits Characteristic Operate Point Release Point Hysteresis Symbol BOP BRP Bhys BOP - BRP Test Conditions Min. - 5.0 - Typ. 35 25 10 Max. 50 - - Units G G G
NOTES: 1. Typical Data is at TA = +25C and VCC = 12 V and is for design information only. 2. 1 gauss (G) is exactly equal to 0.1 millitesla (mT).
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4
3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH
TYPICAL OPERATING CHARACTERISTICS as a function of temperature
SWITCH POINTS
50
40
SWITCH POINTS IN GAUSS
OPERATE POINT
30
RELEASE POINT
20
10
VCC = 4.5 V VCC = 24 V
0 -50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN C
Dwg. GH-026-5
OUTPUT SATURATION VOLTAGE
300
SUPPLY CURRENT
6.0
IOUT = 20 mA VCC = 12 V
VCC = 12 V
SATURATION VOLTAGE IN mV
5.0
200
SUPPLY CURRENT IN mA
4.0
OUTPUT ON, B > BOP
100
3.0
OUTPUT OFF, B < BRP
0 -50
-25
0
25
50
75
100
125
150
2.0 -50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN C
Dwg. GH-029-4
AMBIENT TEMPERATURE IN C
Dwg. GH-028-5
5
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH
TYPICAL OPERATING CHARACTERISTICS as a function of supply voltage
SWITCH POINTS
40
OPERATE POINT
30
SWITCH POINT IN GAUSS
RELEASE POINT
20
TA = 150C TA = -40C
10
0 3.0
3.5
4.0
4.5
5.0
24
Dwg. GH-021-2
SUPPLY VOLTAGE IN VOLTS
OUTPUT SATURATION VOLTAGE
250
IOUT = 20 mA TA = 150C TA = +25C TA = -40C
SUPPLY CURRENT
8.0 7.0 6.0
OUTPUT ON TA = 150C TA = +25C TA = -40C
SATURATION VOLTAGE IN mV
225
SUPPLY CURRENT IN mA
5.0 4.0 3.0 2.0 1.0
200
175
150 3.0
3.5
4.0
4.5
5.0
24
Dwg. GH-055-1
0 3.0
4.0
5.0
6.0
7.0
8.0
9.0
10
11
12
SUPPLY VOLTAGE IN VOLTS
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-058-4
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6
3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH
SENSOR LOCATIONS
Package Designator `LH'
ACTIVE AREA DEPTH 0.011" 0.28 mm NOM
0.059" 1.49 mm
3
0.038" 0.96 mm
A
1
2
Dwg. MH-025
Package Designator `LT'
ACTIVE AREA DEPTH 0.0305" 0.775 mm NOM
0.088" 2.24 mm 0.045" 1.14 mm
A
1 2 3
Dwg. MH-008-8A
Package Designator `UA'
ACTIVE AREA DEPTH 0.0195" 0.50 mm NOM 0.080" 2.04 mm
0.056" 1.44 mm
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
A
BRANDED SURFACE
1
2
3
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. However, 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.
Dwg. MH-011-9B
7
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH
FUNCTIONAL DESCRIPTION
Chopper-Stabilized Technique. The Hall element can be considered as a resistor array similar to a Wheatstone bridge. A large portion of the offset is a result of the mismatching of these resistors. These devices use a proprietary dynamic offset cancellation technique, with an internal high-frequency clock to reduce the residual offset voltage of the Hall element that is normally caused by device overmolding, temperature dependencies, and thermal stress. The chopper-stabilizing technique cancels the mismatching of the resistor circuit by changing the direction of the current flowing through the Hall plate using CMOS switches and Hall voltage measurement taps, while maintaing the Hall-voltage signal that is induced by the external magnetic flux. The signal is then captured by a sample-andhold circuit and further processed using low-offset bipolar circuitry. This technique produces devices that have an extremely stable quiescent Hall output voltage, are immune to thermal stress, and have precise recoverability after temperature cycling. This technique will also slightly degrade the device output repeatability. A relatively high sampling frequency is used in order that faster signals can be processed. More detailed descriptions of the circuit operation can be found in: Technical Paper STP 97-10, Monolithic Magnetic Hall Sensor Using Dynamic Quadrature Offset Cancellation and Technical Paper STP 99-1, Chopper-Stabilized Amplifiers With A Track-and-Hold Signal Demodulator. Operation. The output of these devices switches low (turns on) when a magnetic field (south pole) perpendicular to the Hall sensor exceeds the operate point threshold (BOP). After turn-on, the output is capable of sinking 25 mA and the output voltage is VOUT(SAT). When the magnetic field is reduced below the release point (BRP), the device output goes high (turns off). The difference in the magnetic operate and release points is the hysteresis (Bhys) of the device. This built-in hysteresis allows clean switching of the output even in the presence of external mechanical vibration and electrical noise. Applications. It is strongly recommended that an external bypass capacitor be connected (in close proximity to the Hall sensor) between the supply and ground of the device to reduce both external noise and noise generated by the chopperstabilization technique. The simplest form of magnet that will operate these devices is a ring magnet. Other methods of operation, such as linear magnets, are possible. Extensive applications information on magnets and Hall-effect sensors is also available in Application Note 27701, or at
REG
X
B +V
--
HALL VOLTAGE
+
Dwg. AH-011-2
+V
VCC
OUTPUT VOLTAGE
B RP
B OP
VOUT(SAT)
0 0 FLUX DENSITY +B
Dwg. GH-007-2
SUPPLY
3
PTCT
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CC
2
0.1 F
1
V
www.allegromicro.com
SAMPLE & HOLD
Dwg. EH-012
OUTPUT
X
SUPPLY
Dwg. EH-013
8
3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH
PACKAGE DESIGNATOR `LH'
(fits SC-59A solder-pad layout) Dimensions in Inches (for reference only) Dimensions in Millimeters (controlling dimensions)
0.122 0.114
3.10 2.90
0.50 0.30
0.020 0.012 0.083 0.073
3
1
2
0.118 0.106
GAUGE PLANE SEATING PLANE
0.010
BSC
2.10 1.85
3
1 2
3.00 2.70
GAUGE PLANE SEATING PLANE
0.25
BSC
0.022
REF
0.55
0.010
MIN
0.037
BSC
0 TO 8
REF
0.95
BSC
0 TO 8
0.20 0.127
0.25
MIN
0.006 0.000
0.045 0.032
0.0079 0.0050
0.15 0.00
Dwg. MA-010-3D in
1.13 0.87
Dwg. MA-010-3D mm
0.028
3
0.70
3
0.039 0.094
1 2
1.00 2.40
1 2
0.037
Dwg. MA-011-3 in
0.95
Dwg. MA-011-3 mm
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 vendor's option within limits shown. 3. Height does not include mold gate flash. 4. Where no tolerance is specified, dimension is nominal. 5. Add "LT" to part number for tape and reel.
9
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH
PACKAGE DESIGNATOR `LT'
(SOT89/TO-243AA) Dimensions in Inches (for reference only) Dimensions in Millimeters (controlling dimensions)
0.181 0.173 0.072 0.064 0.167 0.155 0.102 0.090
0.063 0.055
0.0173 0.0138
4.60 4.40 1.83 1.62 4.25 3.94 2.60 2.29
1.60 1.40
0.44 0.35
1
2
3
0.090 0.084
1
2
3
2.29 2.13
0.047 0.035 0.059
BSC
0.0189 0.0142 0.0221 0.0173 0.118
BSC
Dwg. MA-009-3A in
1.20 0.89 1.50
BSC
0.48 0.36 0.56 0.44 3.00
BSC
Dwg. MA-009-3A mm
0.098 0.079 B A 0.031 0.102 0.181 3 0.047 0.031
TYP
2.5 2.0 B A 0.8 2.6 4.6 1.2 0.8
TYP
1 0.028
TYP
2
1 0.7
TYP
2
3
Pads 1, 2, 3, and A -- Standard SOT89 Layout Pads 1, 2, 3, and B -- Low-Stress Version Pads 1, 2, and 3 only -- Lowest Stress, But Not Self Aligning
Dwg. MA-012-3 in
Pads 1, 2, 3, and A -- Standard SOT89 Layout Pads 1, 2, 3, and B -- Low-Stress Version Pads 1, 2, and 3 only -- Lowest Stress, But Not Self Aligning
Dwg. MA-012-3 mm
NOTES: 1. Exact body and lead configuration at vendor's option within limits shown. 2. Supplied in bulk pack (500 pieces per bag) or add "TR" to part number for tape and reel. 3. Only low-temperature (240C) reflow-soldering techniques are recommended for SOT89 devices.
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10
3240 CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH
PACKAGE DESIGNATOR `UA'
Dimensions in Inches (controlling dimensions)
0.164 0.159
Dimensions in Millimeters (for reference only)
4.17 4.04
45
0.062 0.058
45
1.57 1.47
0.122 0.117 45 0.031
3.10 2.97 45 0.79
0.085
MAX
1
2
3
2.16
MAX
1
2
3
0.640 0.600
0.0173 0.0138
16.26 15.24
0.44 0.35
SEE NOTE
0.0189 0.0142
SEE NOTE
0.48 0.36
0.050
BSC
Dwg. MH-014E in
1.27
BSC
Dwg. MH-014E mm
Ra
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 vendor's 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. Supplied in bulk pack (500 pieces per bag).
11
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

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