Data Sheet 27621.6A* 3141 THRU 3144 SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMPERATURE OPERATION X These Hall-effect switches are monolithic integrated circuits with tighter magnetic specifications, designed to operate continuously over extended temperatures to +150°C, and are more stable with both temperature and supply voltage changes. The unipolar switching characteristic makes these devices ideal for use with a simple bar or rod magnet. The four basic devices (3141, 3142, 3143, and 3144) are identical except for magnetic switch points. CC 2 3 OUTPUT SUPPLY 1 GROUND V Dwg. PH-003A Each device includes a voltage regulator for operation with supply voltages of 4.5 to 24 volts, reverse battery protection diode, quadratic Hall-voltage generator, temperature compensation circuitry, smallsignal amplifier, Schmitt trigger, and an open-collector output to sink up to 25 mA. With suitable output pull up, they can be used with bipolar or CMOS logic circuits. The A3141– and A3142– are improved replacements for the UGN/UGS3140–; the A3144– is the improved replacement for the UGN/UGS3120–. The first character of the part number suffix determines the device operating temperature range. Suffix ‘E–’ is for the automotive and industrial temperature range of -40°C to +85°C. Suffix ‘L–’ is for the automotive and military temperature range of -40°C to +150°C. Three 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 ‘–U’ is a three-lead plastic mini-SIP, while suffix ‘–UA’ is a three-lead ultra-mini-SIP. Pinning is shown viewed from branded side. FEATURES and BENEFITS ABSOLUTE MAXIMUM RATINGS at TA = +25°C Supply Voltage, VCC ............................ 28 V Reverse Battery Voltage, VRCC ........... -35 V Magnetic Flux Density, B .......... Unlimited Output OFF Voltage, VOUT .................. 28 V Reverse Output Voltage, VOUT ........... -0.5 V Continuous Output Current, IOUT ...... 25 mA ■ ■ ■ ■ ■ ■ ■ ■ Superior Temp. Stability for Automotive or Industrial Applications 4.5 V to 24 V Operation … Needs Only An Unregulated Supply Open-Collector 25 mA Output … Compatible with Digital Logic Reverse Battery Protection Activate with Small, Commercially Available Permanent Magnets Solid-State Reliability Small Size Resistant to Physical Stress 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 The A3141xU, A3142xU, A3143xU, and A3144xU are not for new design. Always order by complete part number, e.g., A3141ELT . 3141 THRU 3144 SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMP. OPERATION FUNCTIONAL BLOCK DIAGRAM 1 VCC REG. X 3 OUTPUT 2 GROUND Dwg. FH-005-2 ELECTRICAL CHARACTERISTICS at VCC = 8 V over operating temperature range. Limits Characteristic Symbol Test Conditions Min. Supply Voltage VCC Operating 4.5 Max. Units 24 V VOUT(SAT) IOUT = 20 mA, B > BOP 175 400 mV Output Leakage Current IOFF VOUT = 24 V, B < BRP <1.0 10 µA Supply Current ICC B < BRP (Output OFF) 4.4 9.0 mA Output Rise Time tr RL = 820 Ω, CL = 20 pF 0.04 2.0 µs Output Fall Time tf RL = 820 Ω, CL = 20 pF 0.18 2.0 µs Output Saturation Voltage Typ. MAGNETIC CHARACTERISTICS in gauss over operating supply voltage range. Part Numbers* A3141– Characteristic BOP at TA = 25°C over operating temp. range BRP at TA = 25°C over operating temp. range Bhys at TA = 25°C over operating temp. range A3142– Min. Typ. Max. Min. Typ. 50 100 160 130 30 100 175 10 45 10 A3143– A3144– Max. Min. Typ. Max. Min. 180 230 220 280 340 70 350 115 180 245 205 280 355 35 450 130 75 125 175 165 225 285 50 330 45 145 60 125 190 150 225 300 25 430 20 55 80 30 55 80 30 55 80 20 55 20 55 80 30 55 80 30 55 80 20 55 NOTES: Typical values are at TA = +25°C and VCC = 8 V. BOP = operate point (output turns ON); BRP = release point (output turns OFF); Bhys = hysteresis (BOP - BRP). *Complete part number includes a suffix to identify operating temperature range (E- or L-) and package type ( -LT, -U, or -UA). 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 1999, Allegro MicroSystems, Inc. Typ. Max. 3141 THRU 3144 SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMP. OPERATION TYPICAL OPERATING CHARACTERISTICS A3142– SWITCH POINTS OUTPUT SATURATION VOLTAGE 300 400 I OUT = 20 mA V =8V V CC = 4.5–24 V CC SATURATION VOLTAGE IN mV SWITCH POINT IN GAUSS 300 OPERATE POINT 200 RELEASE POINT 100 0 -25 25 50 100 75 125 100 0 -50 0 -50 200 150 -25 0 25 50 75 100 125 150 AMBIENT TEMPERATURE IN °C AMBIENT TEMPERATURE IN °C Dwg. GH-044 Dwg. GH-040-1 SUPPLY CURRENT SUPPLY CURRENT 10 7.0 VCC = 8 V B ≥ B OP SUPPLY CURRENT IN mA SUPPLY CURRENT IN mA 8.0 B ≥ B OP 6.0 B ≤ B RP 4.0 6.0 5.0 T A = +25°C 2.0 B ≤ B RP 4.0 0 0 5 10 15 20 25 SUPPLY VOLTAGE IN VOLTS -50 -25 0 25 75 100 125 150 AMBIENT TEMPERATURE IN °C Dwg. GH-041-1 * Complete part number includes a suffix denoting operating temperature range (E- or L-) and package type ( -LT, -U, or -UA). www.allegromicro.com 50 Dwg. GH-039-1 3141 THRU 3144 SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMP. OPERATION TYPICAL OPERATING CHARACTERISTICS (cont.) SENSOR LOCATIONS (±0.005” [0.13 mm] die placement) CHANGE IN OPERATE POINT Suffix “LT” ACTIVE AREA DEPTH 0.0305" 0.775 mm NOM 20 0.043" 1.09 mm A 1 2 3 Dwg. MH-008-2D Suffix “U” ACTIVE AREA DEPTH 0.0165" 0.42 mm NOM 0.091" 2.31 mm CHANGE IN OPERATE POINT IN GAUSS 0.089" 2.26 mm 15 T A = +25°C 10 5.0 0 -5.0 0 5 10 15 20 25 SUPPLY VOLTAGE IN VOLTS 0.070" 1.78 mm OPERATION A BRANDED SURFACE 1 2 3 Dwg. MH-002-2C Suffix “UA” ACTIVE AREA DEPTH 0.0195" 0.50 mm NOM 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 threshold (BRP), the device output goes high. 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. 0.082" 2.07 mm 0.055" 1.39 mm A BRANDED SURFACE Dwg. GH-042-1 1 2 3 Dwg. MH-011-10A 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3141 THRU 3144 SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMP. OPERATION PACKAGE DESIGNATOR ‘LT’ (SOT-89/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 0.102 0.090 0.0173 0.0138 0.090 0.084 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. www.allegromicro.com 3141 THRU 3144 SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMP. OPERATION PACKAGE DESIGNATOR ‘U’ Dimensions in Inches (controlling dimensions) Dimensions in Millimeters (for reference only) 4.65 4.52 0.183 0.178 1.60 1.50 0.063 0.059 4.60 4.47 0.181 0.176 45° 45° 0.086 1 2 0.018 3 2.18 1 2 0.46 3 MAX MAX 0.0173 0.0138 0.600 0.560 0.44 0.35 15.24 14.23 0.48 0.36 0.0189 0.0142 SEE NOTE SEE NOTE 1.27 0.050 0.100 2.54 Dwg. MH-003E in Dwg. MH-003E mm Devices in the ‘U’ package are NOT RECOMMENDED FOR NEW DESIGN 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). 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3141 THRU 3144 SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMP. OPERATION PACKAGE DESIGNATOR ‘UA’ Dimensions in Inches (controlling dimensions) Dimensions in Millimeters (for reference only) 4.17 4.04 0.164 0.159 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 0.48 0.36 SEE NOTE 1.27 0.050 BSC 0.44 0.35 Dwg. MH-014E in BSC 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. www.allegromicro.com Dwg. MH-014E mm 3141 THRU 3144 SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMP. OPERATION 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 design of its products. 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 which may result from its use. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000