A3161 Hall-Effect Switch for 2-Wire Applications Discontinued Product These parts are no longer in production The device should not be purchased for new design applications. Samples are no longer available. Date of status change: May 7, 2013 Recommended Substitutions: For existing customer transition, and for new customers or new applications, refer to the A1150. NOTE: For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative. Allegro MicroSystems, LLC reserves the right to make, from time to time, revisions to the anticipated product life cycle plan for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use. Data Sheet 27621.30B 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, 2002 Allegro MicroSystems, Inc. 3161 HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS TYPICAL OPERATING CHARACTERISTICS SWITCH POINTS TOTAL SUPPLY CURRENT 20 + I CC ) in mA 200 TOTAL SUPPLY CURRENT (I OPERATE POINT RELEASE POINT 100 50 OVER OPER. VOLT. RANGE -25 0 B < BRP VCC = 3.5 V 25 50 75 100 125 10 5.0 VCC = 25 V 150 B > BOP VCC = 3.5 V 0 -50 0 -50 VCC = 25 V 15 OUT SWITCH POINT in GAUSS 150 -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 80 100 120 140 160 180 AMBIENT TEMPERATURE in °C Dwg. GH-029-3 www.allegromicro.com MAXIMUM CONTINUOUS SUPPLY VOLTAGE in VOLTS 1200 Dwg. GH-068 3161 HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS ELEMENT LOCATIONS OPERATION The output of these devices (pin 3) switches OFF when the magnetic field at the Hall element exceeds the operate point threshold (B OP). 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 0.0305" 0.775 mm NOM 0.085" 2.16 mm 0.045" 1.14 mm A 15 1 2 3 12 OUTPUT CURRENT in mA BOP Dwg. MH-008-7A Suffix “UA” ACTIVE AREA DEPTH 0.0195" 0.50 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 1 2 0 0 25 50 75 100 125 150 175 200 MAGNETIC FLUX DENSITY in GAUSS 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, www.allegromicro.com. or at Dwg. MH-011-8A Allegro TYPICAL 2-WIRE APPLICATION CC 0.85 V – 2 V 0.1 µF + 1 3 SUPPLY Icc + IoUT 100 Ω 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’ (SOT89/TO-243AA) Dimensions in Inches (for reference only) 0.181 0.173 0.072 0.064 0.167 0.155 1 2 0.063 0.055 0.102 0.090 3 Dimensions in Millimeters (controlling dimensions) 0.0173 0.0138 0.090 0.084 4.25 3.94 0.0189 0.0142 0.0221 0.0173 0.047 0.035 0.059 4.60 4.40 1.83 1.62 3.00 BSC Dwg. MA-009-3A in Dwg. MA-009-3A mm 2.5 2.0 0.098 0.079 B B 0.031 0.102 A 0.8 2.6 A 4.6 0.181 1 2 2.29 2.13 0.56 0.44 1.50 0.118 BSC 2.60 2.29 3 0.44 0.35 0.48 0.36 1.20 0.89 BSC BSC 2 1 1.60 1.40 3 0.047 1 2 3 1.2 0.028 0.031 0.7 0.8 TYP TYP TYP TYP 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 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 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 (≤240°C) reflow-soldering techniques are recommended for SOT89 devices. www.allegromicro.com 3161 HALL-EFFECT SWITCH FOR 2-WIRE APPLICATIONS PACKAGE DESIGNATOR ‘UA’ Dimensions in Millimeters (for reference only) Dimensions in Inches (controlling dimensions) 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° 45° 0.085 1 2 3 0.031 2.16 1 2 0.79 3 MAX MAX 0.640 0.600 16.26 15.24 0.0173 0.0138 0.0189 0.0142 SEE NOTE 0.44 0.35 0.48 0.36 SEE NOTE 1.27 0.050 BSC BSC Dwg. MH-014E in Dwg. MH-014E mm Radial Lead Form (order A3161EUA-LC) 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). 1 2 3 0.108" (2.74 mm) 0.620" 0.500" (15.7 mm 12.7 mm) 0.100" (2.5 mm) Dwg. MH-026 NOTE: Lead-form dimensions are the nominals produced on the forming equipment. No dimensional tolerance is implied or guaranteed for bulk packaging (500 pieces per bag). 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 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 SENSOR ICS UNIPOLAR HALL-EFFECT DIGITAL SWITCHES Partial Part Number A3121x A3122x A3123x A3141x A3142x A3143x A3144x A3161E A3240x Operate Release Hysteresis Point (G) Point (G) (G) Over Oper. Voltage & Temp. Range 220 to 500 80 to 410 260 to 430 120 to 360 230 to 470 160 to 330 30 to 175 10 to 145 115 to 245 60 to 190 205 to 355 150 to 300 35 to 450 25 to 430 <160 (Typ 130) >30 (Typ 110) <50 (Typ 35) >5 (Typ 25) Oper. Temp. Packages 60 to 150 70 to 140 70 to 140 20 to 80 30 to 80 30 to 80 >20 5 to 80 Typ 10 E, L E, L E, L E, L E, L E, L E, L E E, L LT, UA LT, UA LT, UA LT, UA LT, UA LT, UA LT, UA LT, UA LH, LT, UA A3361E <125 >40 5 to 30 E LH, LT, UA A3362E <125 >40 5 to 30 E LH, LT, UA Replaces and Comments 3019, 3113, 3119 3040, 3140 3020, 3120 2-wire operation chopper stabilized 2-wire, chopper stabilized, output normally high 2-wire, chopper stabilized, output normally low Notes: 1) Typical data is at TA = +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. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000