3175 Datasheet

Hall-effect Latches


Features, Applications

These Hall-effect latches are temperature-stable and stress-resistant sensors especially suited for electronic commutation in brushless dc motors using multipole ring magnets. Each device includes a voltage regulator, quadratic Hall voltage generator, temperature compensation circuit, signal amplifier, Schmitt trigger, and an open-collector output on a single silicon chip. The on-board regulator permits operation with supply voltages of 4.5 volts to 18 volts. The switch output can sink 10 mA. With suitable output pull up, they can be used directly with bipolar or MOS logic circuits. The three package styles available provide a magnetically optimized package for most applications. Suffix `LT' is a surface-mount SOT89/ TO-243AA package; suffixe `UA' features wire leads for through-hole mounting.


s Symmetrical Response 18 V Operation s Open-Collector Output s Reverse Battery Protection s Activate With Small, Commercially Available Permanent Magnets s Solid-State Reliability s Small Size s Superior Temperature Stability s Resistant to Physical Stress

Pinning is shown viewed from branded side.

Supply Voltage, VCC. 18 V Reverse Battery Voltage, VRCC. -18 V Magnetic Flux Density, B. Unlimited Output OFF Voltage, VOUT. 18 V Continuous Output Current, IOUT. 15 mA Operating Temperature Range, TA. to +85�C Storage Temperature Range, TS. to +150�C

Always order by complete part number, e.g., UGN3175LT. See Magnetic Characteristics table for differences between devices.

Limits Characteristic Supply Voltage Output Saturation Voltage Output Leakage Current Supply Current Output Rise Time Output Fall Time Symbol VCC VOUT(SAT) IOFF ICC tr tf Test Conditions Operating VCC 18 V, IOUT = 10 mA, B > BOP VOUT B < BRP VCC B < BRP (Output OFF) VCC 20 pF VCC 20 pF Min. 4.5 Typ. Max. Units mA �s

Characteristic Operate Point, BOP Part Number* UGN3175 UGN3177 Release Point, BRP UGN3175 UGN3177 Hysteresis, Bhys = +25�C Min. Typ. 200 Max. Min. to +85�C Typ. 180 Max.

NOTE: As used here, negative flux densities are defined as less than zero (algebraic convention). Complete part number includes a suffix denoting package type (LT or UA).

115 Northeast Cutoff, Box 15036 Worcester, Massachusetts (508) 853-5000 Copyright 1991, 2002 Allegro MicroSystems, Inc.

The products described herein are manufactured under one or more of the following U.S. patents: 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.



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