3161

3161 ALLEGRO

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This Hall-effect switch is a monolithic integrated circuit designed to operate continuously over extended temperatures to +85°C. The unipo- lar switching characteristic makes this device ideal for use with a simple bar or rod magnet. The A3161ELT and A3161EUA are identical except for package. Each device includes a voltage regulator for operation with supply voltages of 3.5 to 25 volts, reverse battery protection diode, quadratic Hall-voltage generator, temperature compensation circuitry, small-signal amplifier, Schmitt trigger, and a constant-current open-collector output. Noise radiation is limited by control of the output current slew rate. Two package styles provide a magnetically optimized package for most applications. Suffix ‘LT’ is a miniature SOT-89/TO-243AA transistor package for surface-mount applications; suffix ‘UA’ is a three- lead ultra-mini SIP for through-hole mounting. HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS Always order by complete part number, e.g., A3161ELT . Data Sheet27621.30A‡ Pinning is shown viewed from branded side. ABSOLUTE MAXIMUM RATINGS at TA = +25°C FEATURES and BENEFITS I Internal Current Regulator for 2-Wire Operation I Output Slew Rate Controlled I 3.5 V to 25 V Operation … Needs Only An Unregulated Supply I Reverse Battery Protection I Excellent Temp. Stability I Activate with Small, Commercially Available Permanent Magnets I Small Size I Solid-State Reliability … No Moving Parts I Resistant to Physical Stress 3161 Supply Voltage, VCC Reverse Battery Voltage, VRCC Operating Temperature Range, Storage Temperature Range, Dwg. PH-003-3 SUPPLY VCC GROUND OUTPUT X

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000 Limits At TA = +25°C Over Oper. Temp. Range Operate Point (output turns OFF) B OP – 130 160 – 130 160 G Release Point (output turns ON) B RP 30 110 – 30 110 – G Hysteresis (BOP - BRP)B hys 5.0 20 – 5.0 20 80 G Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Supply Voltage V CC Operating 3.5 — 25 V Load Current I OUT + ICC 3.5 V ≤ VOUT < 12 V, B < BRP 12 15 17 mA (2-wire application) VOUT ≥ 12 V, B < BRP 12 15 19 mA B > BOP —3 . 5 5 . 0 m A Output Current I OUT B < BRP —1 2— m A IOFF VOUT = 24 V, B > BOP — <1.0 10 µA Output Saturation Voltage V OUT IOUT = 5 mA, B < BRP –0 . 9 1 . 5 V Output Slew Rate di/dt C L = 20 pF — 7.0 20 mA/ µs Output Settling Time t sd CL = 20 pF — — 20 µs ELECTRICAL CHARACTERISTICS over operating voltage and temperature ranges. Copyright © 1998, 1999, Allegro MicroSystems, Inc. MAGNETIC CHARACTERISTICS over operating supply voltage range. FUNCTIONAL BLOCK DIAGRAM NOTE:Typical values are at TA = +25°C and VCC = 12 V. VCC X REG. Dwg. FH-017 GROUND OUTPUT3

www.allegromicro.com SWITCH POINTS TOTAL SUPPLY CURRENT TYPICAL OPERATING CHARACTERISTICS OUTPUT SATURATION VOLTAGE SAFE OPERATING AREA 0 50 100 AMBIENT TEMPERATURE in °C -50 Dwg. GH-044-1 SWITCH POINT in GAUSS 150 200 100 150 -25 25 75 125 OVER OPER. VOLT. RANGE OPERATE POINT RELEASE POINT TOTAL SUPPLY CURRENT (IOUT + ICC) in mA 0 2 55 07 51 0 0 AMBIENT TEMPERATURE in °C -50 Dwg. GH-028-4 125-25 150 5.0 B < BRP B > BOP VCC = 25 V VCC = 25 V VCC = 3.5 V VCC = 3.5 V 20 60 100 140 AMBIENT TEMPERATURE in °C MAXIMUM CONTINUOUS SUPPLY VOLTAGE in VOLTS Dwg. GH-068 40 80 120 180 160 PACKAGE SUFFIX CODE -UA PACKAGE SUFFIX CODE -LT 0 25 50 75 100 1200 AMBIENT TEMPERATURE in °C 800 400 -50 Dwg. GH-029-3 SATURATION VOLTAGE in mV 150-25 125 IOUT = 5 mA VCC = 10 V 1000 600 200

Worcester, Massachusetts 01615-0036 (508) 853-5000 Suffix “LT” SENSOR LOCATIONS OPERATION The output of these devices (pin 3) switches OFF when the magnetic field at the Hall sensor exceeds the operate point threshold (B OP). When the magnetic field is reduced to below the release point threshold (B RP), the device output switches ON. The difference in the magnetic operate and release points is called 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. Suffix “UA” APPLICATIONS INFORMATION These devices are normally operated in a 2-wire mode, where the supply terminal and the output terminal are tied together. An external comparator detects the change in total supply current by the addition (output off, B > B OP) or subtraction (output on, B < BRP) of IOUT. Hall effect applications information is available in the “Hall-Effect IC Applications Guide”, which can be found in the latest issue of the Allegro MicroSystems Electronic Data Book , AMS-702 or Application Note 27701, or at www.allegromicro.com. TYPICAL 2-WIRE APPLICATION 0.045" 1.14 mm 1 32 Dwg. MH-008-7 0.030" 0.76 mm NOM ACTIVE AREA DEPTH 0.085" 2.16 mm A 1 32 Dwg. MH-011-8 0.018" 0.46 mm NOM BRANDED SURFACE ACTIVE AREA DEPTH 0.078" 1.98 mm 0.054" 1.36 mmA 0.85 V 1VCC X 100 Ω Dwg. EH-011A 0.1 µF SUPPLY Icc + IoUT 100 125 150 175 200 3.0 OUTPUT CURRENT in mA MAGNETIC FLUX DENSITY in GAUSS 9.0 6.0 Dwg. GH-007-1 50250 BOP BRP TA = +25°C Allegro

www.allegromicro.com PACKAGE DESIGNATOR ‘LT’ 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 0.01420.047 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 0.361.20 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

Worcester, Massachusetts 01615-0036 (508) 853-5000 PACKAGE DESIGNATOR ‘UA’ Dimensions in Inches Dimensions in Millimeters (controlling dimensions) (for reference only) 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. 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° 0.031123 0.122 0.117 SEE NOTE 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° 0.79123 3.10 2.97 SEE NOTE

www.allegromicro.com 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; 5,686,894; 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. However, Allegro MicroSystems, Inc. assumes no responsibil- ity for its use; nor for any infringements of patents or other rights of third parties that may result from its use.

Worcester, Massachusetts 01615-0036 (508) 853-5000 HALL-EFFECT SENSORS Partial Part Avail. Oper. Characteristics at T A = +25°C Number Temp. B OP max B RP min B hys typ Features Notes HALL-EFFECT UNIPOLAR SWITCHES in order of BOP and Bhys 3240 E/L +50 +5.0 10 chopper stabilized 1 3209 E ±60 ±5.0 7.7 400 µW, chopper stabilized 3210 E ±60 ±5.0 7.7 25 µW, chopper stabilized 3361 E +110 +55 5.0* 2-wire, chopper stabilized 3362 E +110 +55 5.0* 2-wire, chopper stabilized, inverted output

3161 E +160 +30 20 2-wire

3141 E/L +160 +10 55

3235 S +175 +25 15* output 1 2

-25 -175 15* output 2 2

5140 E +200 +50 55 300 mA power driver output 1

3142 E/L +230 +75 55

3143 E/L +340 +165 55

3144 E/L +350 +50 55

3122 E/L +400 +140 105

3123 E/L +440 +180 105

3121 E/L +450 +125 105

HALL-EFFECT LATCHES & BIPOLAR SWITCHES† in order of BOP and Bhys

3260 E/L +30 -30 20 bipolar switch, chopper stabilized

3280 E/L +40 -40 45 chopper stabilized

3134 E/L +50 -50 27 bipolar switch

3133 K/L/S +75 -75 52 bipolar switch

3281 E/L +90 -90 100 chopper stabilized

3132 K/L/S +95 -95 52 bipolar switch

3187 E/L +150 -150 100*

3177 S +150 -150 200

3625 S +150 -150 200 900 mA power driver output 1, 3

3626 S +150 -150 200 400 mA power driver output 1, 3

3195 E/L +160 -160 220 active pulldown 1

3197 L +160 -160 230 1

3175 S +170 -170 200

3188 E/L +180 -180 200*

3283 E/L +180 -180 300 chopper stabilized

3189 E/L +230 -230 100*

3275 S +250 -250 100* 3

3185 E/L +270 -270 340*

Operating Temperature Ranges: Notes 1. Protected. 2. Output 1 switches on south pole, output 2 switches on north pole for 2-phase, bifilar-wound, unipolar-driven brushless dc motor control. 3. Complementary outputs for 2-phase bifilar-wound, unipolar-driven brushless dc motor control. * Minimum. ‡ Maximum † Latches will not switch on removal of magnetic field; bipolar switches may switch on removal of field but require field reversal for reliable operation over operating temperature range.