3123

3121 ALLEGRO | Alldatasheet

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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 tem- perature and supply voltage changes. The unipolar switching character- istic makes these devices ideal for use with a simple bar or rod magnet. The three basic devices (3121, 3122, and 3123) are identical except for magnetic switch points. Each device includes a voltage regulator for operation with supply voltages of 4.5 voltas to 24 volts, reverse battery protection diode, quadratic Hall-voltage generator, temperature compensation circuitry, small-signal 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 3121 is an improved replacement for the 3113 and 3119. 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. HALL-EFFECT SWITCHES FOR HIGH-TEMPERATURE OPERATION Always order by complete part number, e.g., A3121EU . ABSOLUTE MAXIMUM RATINGS at TA = +25°C Continuous Output Current, IOUT ... 25 mA Operating Temperature Range, TA Storage Temperature Range, FEATURES and BENEFITS I Superior Temp. Stability for Automotive or Industrial Applications I 4.5 V to 24 V Operation … Needs Only An Unregulated Supply I Open-Collector 25 mA Output … Compatible with Digital Logic I Reverse Battery Protection I Activate with Small, Commercially Available Permanent Magnets I Solid-State Reliability … No Moving Parts I Small Size I Resistant to Physical Stress Data Sheet27621.4B Pinning is shown viewed from branded side. 3121, 3122, AND 3123 Dwg. PH-003A 1SUPPLY VCC GROUND OUTPUT X

3121, 3122, AND 3123 HALL-EFFECT SWITCHES FOR HIGH-TEMPERATURE OPERATION

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000 FUNCTIONAL BLOCK DIAGRAM Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Supply Voltage V CC Operating 4.5 — 24 V Output Saturation Voltage V OUT(SAT) IOUT = 20 mA, B > BOP — 14040 0mV Output Leakage Current I OFF VOUT = 24 V, B < BRP — <1.010 µA Supply Current I CC B < BRP (Output OFF) — 4.6 9.0mA Output Rise Time t r RL = 820 Ω, CL = 20 pF — 0.04 2.0 µs Output Fall Time t f RL = 820 Ω, CL = 20 pF — 0.18 2.0 µs ELECTRICAL CHARACTERISTICS over operating temperature range, at VCC = 12 V. MAGNETIC CHARACTERISTICS in gauss over operating supply voltage range. Part Numbers* A3121 A3122 A3123 B OP at TA = 25°C 250350450 28034040 0 250345 440 over operating temp. range 22035050 0 260340430 230345 470 BRP at TA = 25°C 125 245 380 140235 330 18024030 0 over operating temp. range 80245 410 120235 360 160240330 Bhys at TA = 25°C 7010 5 140 7010 5 140 7010 5 140 over operating temp. range 6010 5 150 7010 5 140 7010 5 140 NOTES: Typical values are at TA = +25°C and VCC = 12 V. BOP = operate point (output turns ON); B RP = release point (output turns OFF); B hys = hysteresis (BOP - BRP). *Complete part number includes a suffix to identify operating temperature range (E- or L-) and package type ( -LT, -U, or -UA). VCC X REG. Dwg. FH-005-2 GROUND OUTPUT3 Copyright © 1992, 1999, Allegro MicroSystems, Inc.

3121, 3122, AND 3123 HALL-EFFECT SWITCHES FOR HIGH-TEMPERATURE OPERATION SWITCH POINTS OUTPUT SATURATION VOLTAGE * Complete part number includes a suffix denoting operating temperature range (E- or L-) and package type ( -LT, -U, or -UA). TYPICAL OPERATING CHARACTERISTICS 0 50 100 AMBIENT TEMPERATURE IN °C -50 Dwg. GH-038 SWITCH POINT IN GAUSS 300 400 200 100 OPERATE POINT RELEASE POINT V = 12 V CC 150 -25 25 75 125 0 25 50 75 100 AMBIENT TEMPERATURE IN °C -50 Dwg. GH-040 150-25 125 I = 20 mA V = 4.5–24 V OUT CC 0 25 50 75 100 AMBIENT TEMPERATURE IN °C -50 Dwg. GH-039 125-25 V = 12 VCC SUPPLY CURRENT IN mA 7.0 6.0 5.0 4.0 150 B ≤ B RP B ≥ B OP 10 15 20 25 SUPPLY VOLTAGE IN VOLTS Dwg. GH-041 SUPPLY CURRENT IN mA 2.0 4.0 6.0 8.0 B ≥ B OP B ≤ B RP T = +25°CA SUPPLY CURRENTSUPPLY CURRENT

3121, 3122, AND 3123 HALL-EFFECT SWITCHES FOR HIGH-TEMPERATURE OPERATION Worcester, Massachusetts 01615-0036 (508) 853-5000 SENSOR LOCATIONS (±0.005" [0.13 mm] die placement) OPERATION The output of these devices (pin 3) switches low when the mag- netic 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 (B hys) of the device. This built-in hysteresis allows clean switching of the output even in the presence of external mechani- cal vibration and electrical noise. APPLICATIONS INFORMATION Hall effect applications information is available in the “Hall-Effect IC Applications Guide”, which can be found in the latest issue of Allegro MicroSystems Data Book AMS-702. CHANGE IN OPERATE POINT Suffix “LT” Suffix “U” Suffix “UA” 0.043" 1.09 mm 1 32 Dwg. MH-008-2C 0.030" 0.76 mm NOM ACTIVE AREA DEPTH 0.089" 2.26 mm A 1 32 Dwg. MH-002-2B 0.016" 0.41 mm NOM BRANDED SURFACE ACTIVE AREA DEPTH 0.070" 1.78 mmA 0.091" 2.31 mm 1 32 Dwg. MH-011-2C 0.019" 0.48 mm NOM BRANDED SURFACE ACTIVE AREA DEPTH 0.082" 2.07 mm 0.055" 1.38 mmA 10 15 20 25 SUPPLY VOLTAGE IN VOLTS Dwg. GH-042 CHANGE IN OPERATE POINT IN GAUSS -5.0 5.0 T = +25°CA

3121, 3122, AND 3123 HALL-EFFECT SWITCHES FOR HIGH-TEMPERATURE OPERATION PACKAGE DESIGNATOR ‘LT’ Dimensions in Inches (for reference only) Dimensions in Millimeters (controlling dimensions) Dwg. MA-009-3 in 1 23 0.064 0.072 0.155 0.167 0.059 BSC 0.014 0.0190.035 0.047 0.090 0.102 0.055 0.063 0.014 0.017 0.084 0.090 0.017 0.022 0.118 BSC 0.173 0.181 Dwg. MA-009-3 mm 1 23 4.40 4.60 1.62 1.83 3.94 4.25 1.50 BSC 0.36 0.480.89 1.20 2.29 2.60 1.40 1.60 0.35 0.44 2.13 2.29 0.44 0.56 3.00 BSC NOTE: Exact body and lead configuration at vendor's option within limits shown.

3121, 3122, AND 3123 HALL-EFFECT SWITCHES FOR HIGH-TEMPERATURE OPERATION Worcester, Massachusetts 01615-0036 (508) 853-5000 Dwg. MH-003D in 0.063 0.059 0.018 0.015 0.016 0.050 1 2 3 0.100 45° SEE NOTE 0.183 0.178 0.181 0.176 0.600 0.560 0.086 MAX Dwg. MH-003D mm 1.60 1.50 0.46 0.38 0.41 1.27 1 2 3 2.54 45° SEE NOTE 4.65 4.52 4.60 4.47 15.24 14.23 2.18 MAX PACKAGE DESIGNATOR ‘U’ 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. 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. Devices in the ‘U’ package are NOT RECOMMENDED FOR NEW DESIGN

3121, 3122, AND 3123 HALL-EFFECT SWITCHES FOR HIGH-TEMPERATURE OPERATION 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. 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. Dwg. MH-014D mm 4.17 4.04 1.57 1.47 0.38 1.27 BSC 45° 16.26 15.24 0.41 2.16 MAX 45° 0.79123 3.10 2.97 SEE NOTE Dwg. MH-014D in 0.164 0.159 0.062 0.058 0.015 0.050 BSC 45° 0.640 0.600 0.016 0.085 MAX 45° 0.031123 0.122 0.117 SEE NOTE

3121, 3122, AND 3123 HALL-EFFECT SWITCHES FOR HIGH-TEMPERATURE OPERATION Worcester, Massachusetts 01615-0036 (508) 853-5000 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.