Data Sheet 27631.4C 3134 BIPOLAR HALL-EFFECT SWITCH FOR HIGH-TEMPERATURE OPERATION X This low-hysteresis bipolar Hall-effect switch is an extremely temperature-stable and stress-resistant sensor 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 stability by compensating for temperature changes in the Hall element. Additionally, internal compensation provides magnetic switch points that become more sensitive with temperature, hence offsetting the usual degradation of the magnetic field with temperature. Its low hysteresis makes this device ideal for detecting small changes in magnetic field strength or for use with inexpensive magnets. CC 2 3 OUTPUT SUPPLY 1 GROUND V Dwg. PH-003A The device includes on a single silicon chip a voltage regulator, quadratic 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 volts to 24 volts. The first character of the part number suffix determines the device operating temperature range. Suffix ‘E–’ is for -40°C to +85°C, and suffix ‘L–’ is -40°C to +150°C. Two package styles provide a magnetically optimized package for most applications. Suffix ‘–LT’ is a miniature SOT89/TO-243AA transistor package for surface-mount applications while suffix ‘–UA’ is a three-lead ultra-mini-SIP. Pinning is shown viewed from branded side. ABSOLUTE MAXIMUM RATINGS at TA = +25°C Supply Voltage, VCC ............................. 30 V Reverse Battery Voltage, VRCC .......... -30 V Magnetic Flux Density, B .......... Unlimited Output OFF Voltage, VOUT .................. 30 V Reverse Output Voltage, VOUT ........... -0.5 V Continuous Output Current, IOUT ............................................ 25 mA Operating Temperature Range, TA Suffix ‘E–’ .................. -40°C to +85°C Suffix ‘L–’ ................ -40°C to +150°C Storage Temperature Range, TS .............................. -65°C to +170°C FEATURES ■ 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 Always order by complete part number, e.g., A3134ELT . 3134 LOW-HYSTERESIS BIPOLAR HALL-EFFECT SWITCH FOR HIGH-TEMP. OPERATION FUNCTIONAL BLOCK DIAGRAM 1 VCC REG. X 3 OUTPUT 2 GROUND Dwg. FH-005-3 ELECTRICAL CHARACTERISTICS over operating temperature range, at VCC = 12 V. Limits Characteristic Symbol Supply Voltage VCC Min. Typ. Max. Units Operating 3.8 — 24 V VOUT(SAT) IOUT = 20 mA, B > BOP — 175 400 mV Output Leakage Current IOFF VOUT = 24 V, B < BRP — 0.05 1.0 µA Supply Current ICC B < BRP (Output OFF) — 3.2 9.0 mA B > BOP (Output ON) — 5.0 — mA Output Saturation Voltage Test Conditions Output Rise Time tr RL = 820 Ω, CL = 20 pF — 100 — ns Output Fall Time tf RL = 820 Ω, CL = 20 pF — 100 — ns MAGNETIC CHARACTERISTICS over operating supply voltage range. Limits Characteristic Symbol Operate Point BOP Release Point Hysteresis BRP Bhys Test Conditions Min. Typ. Max. Units at TA = +25°C -40 8.5 50 G Over Oper. Temp. Range -40 – 50 G at TA = +25°C -50 -19 40 G Over Oper. Temp. Range -50 – 40 G at TA = +25°C 10 27 50 G Over Oper. Temp. Range 5.0 – 55 G NOTES: BOP = operate point (output turns ON); BRP = release point (output turns OFF); Bhys = hysteresis (BOP - BRP). As used here, negative flux densities are defined as less than zero (algebraic convention). Typical values are at TA = +25°C and VCC = 12 V. 1 gauss (G) is exactly equal to 0.1 millitesla (mT). 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1995, 2002 Allegro MicroSystems, Inc. 3134 LOW-HYSTERESIS BIPOLAR HALL-EFFECT SWITCH FOR HIGH-TEMP. OPERATION TYPICAL OPERATING CHARACTERISTICS SWITCH POINTS HYSTERESIS 50 40 VCC = 4.5 V–24 V 40 HYSTERESIS IN GAUSS SWITCH POINT IN GAUSS 20 OPERATE POINT 0 -20 VCC = 4.5 V–24 V 30 20 10 RELEASE POINT -40 -50 0 -25 0 25 50 100 75 125 -50 150 -25 0 25 50 100 75 125 150 AMBIENT TEMPERATURE IN ° C AMBIENT TEMPERATURE IN °C Dwg. GH-051 Dwg. GH-052 OUTPUT SATURATION VOLTAGE SUPPLY CURRENT 5.0 300 I OUT = 20 mA B < B RP 4.0 SUPPLY CURRENT IN mA SATURATION VOLTAGE IN mV V CC = 4.5–24 V 200 100 0 -50 V CC = 24 V V CC = 12 V 3.0 VCC = 4.5 V 2.0 1.0 -25 0 25 50 75 100 125 150 Dwg. GH-029 www.allegromicro.com -50 -25 0 25 50 75 AMBIENT TEMPERATURE IN °C AMBIENT TEMPERATURE IN ° C 100 125 150 Dwg. GH-053 3134 LOW-HYSTERESIS BIPOLAR HALL-EFFECT SWITCH FOR HIGH-TEMP. OPERATION SENSOR LOCATIONS APPLICATIONS INFORMATION (±0.005" [0.13 mm] die placement) Suffix “LT” ACTIVE AREA DEPTH 0.0305" 0.775 mm NOM 0.090" 2.27 mm 0.050" 1.27 mm A 1 2 Extensive applications information for Hall-effect sensors is available in: • Hall-Effect IC Applications Guide, Application Note 27701; • Hall-Effect Devices: Soldering, Gluing, Potting, Encapsulating, and Lead Forming, Application Note 27703.1; • Soldering of Through-Hole Hall-Sensor Dervices, Application Note 27703; and • Soldering of Surface-Mount Hall-Sensor Devices, Application Note 27703.2. All are provided in Allegro Electronic Data Book, AMS-702. or at www.allegromicro.com 3 OPERATION Dwg. MH-008-4C Suffix “UA” ACTIVE AREA DEPTH 0.0195" 0.50 mm NOM 0.083" 2.10 mm 0.060" 1.51 mm A BRANDED SURFACE 1 2 The output of these devices (pin 3) switches low when the magnetic field at the Hall sensor exceeds the operate point threshold (BOP). At this point, the output voltage is VOUT(SAT). When the magnetic field is reduced to below the release point (BRP) the device output goes high. Note especially that release can occur when the magnetic field is removed but to ensure release, a field reversal is required. 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. Powering up the device in the absence of a magnetic field (less than BOP and higher than BRP) will allow in indeterminate output state. The correct state is warranted after the first excursion beyond BOP or BRP. 3 Dwg. MH-011-4C 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. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3134 LOW-HYSTERESIS BIPOLAR HALL-EFFECT SWITCH FOR HIGH-TEMP. OPERATION 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 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 3 2.60 2.29 0.44 0.35 2.29 2.13 0.48 0.36 1.20 0.89 0.56 0.44 1.50 BSC 1.60 1.40 3.00 BSC Dwg. MA-009-3A 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. Supplied in bulk pack (500 pieces per bag) or add "TR" to part number for tape and reel. www.allegromicro.com 3134 LOW-HYSTERESIS BIPOLAR HALL-EFFECT SWITCH FOR HIGH-TEMP. OPERATION 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° 3.10 2.97 0.122 0.117 45° 45° 0.085 1 2 3 0.031 2.16 1 2 3 0.79 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 Surface-Mount Lead Form (order A3134xUA-TL or A3134xUA-TS) 0.095 2.41 ±0.005 0.004 MAX ±0.13 0.002 0.051 MAX MAX 0°–8° 0.10 0.020 MIN FLAT MAX Dwg. MH-015 in 0°–8° 0.51 MIN FLAT 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 (no suffix or suffix 'TL' 500 pieces per bag) or tape and reel (suffix 'TS', 4000 pieces per reel). 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Dwg. MH-015 mm