Data Sheet 27621.30A‡ 3161 HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS X This Hall-effect switch is a monolithic integrated circuit designed to operate continuously over extended temperatures to +85°C. The unipolar switching characteristic makes this device ideal for use with a simple bar or rod magnet. The A3161ELT and A3161EUA are identical except for package. 2 3 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 threelead ultra-mini SIP for through-hole mounting. OUTPUT 1 GROUND CC SUPPLY V 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. Dwg. PH-003-3 Pinning is shown viewed from branded side. ABSOLUTE MAXIMUM RATINGS at TA = +25°C Supply Voltage, VCC Continuous ................................. 28 V Surge (tw ≤ 100 ms) .................... 40 V Reverse Battery Voltage, VRCC Continuous ................................ -25 V Surge (tw ≤ 100 ms) ................... -40 V FEATURES and BENEFITS ■ ■ ■ ■ ■ ■ ■ ■ ■ Internal Current Regulator for 2-Wire Operation Output Slew Rate Controlled 3.5 V to 25 V Operation … Needs Only An Unregulated Supply Reverse Battery Protection Excellent Temp. Stability Activate with Small, Commercially Available Permanent Magnets Small Size Solid-State Reliability … No Moving Parts Resistant to Physical Stress Magnetic Flux Density, B ....... Unlimited Output OFF Voltage, VOUT .............. 28 V Operating Temperature Range, TA ............................. -40°C to +85°C Storage Temperature Range, TS ........................... -65°C to +170°C Always order by complete part number, e.g., A3161ELT . 3161 HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS ELECTRICAL CHARACTERISTICS over operating voltage and temperature ranges. Limits Characteristic Symbol Supply Voltage VCC Min. Typ. Max. Units Operating 3.5 — 25 V 3.5 V ≤ VOUT < 12 V, B < BRP 12 15 17 mA VOUT ≥ 12 V, B < BRP 12 15 19 mA B > BOP — 3.5 5.0 mA IOUT B < BRP — 12 — mA IOFF VOUT = 24 V, B > BOP — <1.0 10 µA Output Saturation Voltage VOUT IOUT = 5 mA, B < BRP – 0.9 1.5 V Output Slew Rate di/dt CL = 20 pF — 7.0 20 mA/µs tsd CL = 20 pF — — 20 µs Load Current (2-wire application) Test Conditions IOUT + ICC Output Current Output Settling Time MAGNETIC CHARACTERISTICS over operating supply voltage range. Limits At TA = +25°C Characteristic Over Oper. Temp. Range Symbol Min. Typ. Max. Min. Typ. Max. Units Operate Point (output turns OFF) BOP – 130 160 – 130 160 G Release Point (output turns ON) BRP 30 110 – 30 110 – G Hysteresis (BOP - BRP) Bhys 5.0 20 – 5.0 20 80 G NOTE:Typical values are at TA = +25°C and VCC = 12 V. FUNCTIONAL BLOCK DIAGRAM 1 VCC 3 OUTPUT REG. X 2 GROUND Dwg. FH-017 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1998, 1999, Allegro MicroSystems, Inc. 3161 HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS TYPICAL OPERATING CHARACTERISTICS SWITCH POINTS TOTAL SUPPLY CURRENT 20 TOTAL SUPPLY CURRENT (IOUT + ICC) in mA 200 SWITCH POINT in GAUSS 150 OPERATE POINT RELEASE POINT 100 50 OVER OPER. VOLT. RANGE -25 0 25 50 75 100 125 150 B < BRP VCC = 3.5 V 10 5.0 VCC = 25 V B > BOP VCC = 3.5 V 0 -50 0 -50 VCC = 25 V 15 -25 0 25 50 75 100 125 150 AMBIENT TEMPERATURE in °C AMBIENT TEMPERATURE in °C Dwg. GH-044-1 Dwg. GH-028-4 OUTPUT SATURATION VOLTAGE SAFE OPERATING AREA 30 SATURATION VOLTAGE in mV 1000 800 600 400 IOUT = 5 mA 200 VCC = 10 V 0 -50 -25 0 25 50 75 100 125 150 AMBIENT TEMPERATURE in °C 25 20 PACKAGE SUFFIX CODE -UA 15 PACKAGE SUFFIX CODE -LT 10 5 0 20 40 60 80 100 120 AMBIENT TEMPERATURE in °C Dwg. GH-029-3 www.allegromicro.com MAXIMUM CONTINUOUS SUPPLY VOLTAGE in VOLTS 1200 140 160 180 Dwg. GH-068 3161 HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS 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 (BOP). When the magnetic field is reduced to below the release point threshold (BRP), the device output switches ON. The difference in the magnetic operate and release points is called 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. Suffix “LT” ACTIVE AREA DEPTH 0.030" 0.76 mm NOM 0.085" 2.16 mm 0.045" 1.14 mm 15 A 1 2 3 12 OUTPUT CURRENT in mA BOP Dwg. MH-008-7 Suffix “UA” ACTIVE AREA DEPTH 0.018" 0.46 mm NOM 0.078" 1.98 mm 9.0 6.0 TA = +25°C 3.0 BRP 0.054" 1.36 mm A BRANDED SURFACE 0 0 25 50 75 100 125 150 175 200 MAGNETIC FLUX DENSITY in GAUSS 1 2 3 Dwg. GH-007-1 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 > BOP) 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. Dwg. MH-011-8 Allegro TYPICAL 2-WIRE APPLICATION 0.85 V – 2 V 0.1 µF + 1 3 SUPPLY Icc + IoUT 100 Ω CC Dwg. EH-011A 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 X 3161 HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS PACKAGE DESIGNATOR ‘LT’ Dimensions in Inches (for reference only) 0.181 0.173 0.072 0.064 0.167 0.155 1 2 0.063 0.055 3 0.0173 0.0138 0.090 0.084 0.102 0.090 0.0189 0.0142 0.0221 0.0173 0.047 0.035 0.059 BSC 0.118 BSC Dwg. MA-009-3A in Dimensions in Millimeters (controlling dimensions) 4.60 4.40 1.83 1.62 4.25 3.94 1 2 2.60 2.29 2.29 2.13 0.56 0.44 1.50 3.00 BSC www.allegromicro.com 3 0.44 0.35 0.48 0.36 1.20 0.89 BSC 1.60 1.40 Dwg. MA-009-3A mm 3161 HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS PACKAGE DESIGNATOR ‘UA’ Dimensions in Inches (controlling dimensions) Dimensions in Millimeters (for reference only) 0.164 0.159 4.17 4.04 0.062 0.058 45° 1.57 1.47 45° 0.122 0.117 3.10 2.97 45° 0.085 1 2 3 45° 0.031 2.16 MAX 1 2 3 0.79 MAX 0.0173 0.0138 0.640 0.600 0.0189 0.0142 SEE NOTE 16.26 15.24 0.48 0.36 SEE NOTE 0.050 BSC 0.44 0.35 1.27 Dwg. MH-014E in 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. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 BSC Dwg. MH-014E mm 3161 HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS 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. 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. www.allegromicro.com 3161 HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS HALL-EFFECT SENSORS Partial Part Number Avail. Oper. Characteristics at TA = +25°C Temp. BOP max BRP min Bhys typ Features HALL-EFFECT UNIPOLAR SWITCHES in order of BOP and Bhys 3240 3209 3210 3361 3362 3161 3141 3235 E/L E E E E E E/L S 5140 3142 3143 3144 3122 3123 3121 E E/L E/L E/L E/L E/L E/L +50 ±60 ±60 +110 +110 +160 +160 +175 -25 +200 +230 +340 +350 +400 +440 +450 +5.0 ±5.0 ±5.0 +55 +55 +30 +10 +25 -175 +50 +75 +165 +50 +140 +180 +125 10 7.7 7.7 5.0* 5.0* 20 55 15* 15* 55 55 55 55 105 105 105 Notes chopper stabilized 1 400 µW, chopper stabilized 25 µW, chopper stabilized 2-wire, chopper stabilized 2-wire, chopper stabilized, inverted output 2-wire output 1 output 2 300 mA power driver output 2 2 1 † 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: S = -20°C to +85°C, E = -40°C to +85°C, J = -40°C to +115°C, K = -40°C to +125°C, L = -40°C to +150°C 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. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000