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A1140LUA Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A1140LUA Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 11 page A1140/41/42/43 A1140-DS Worcester, Massachusetts 01615-0036 (508) 853-5000 115 Northeast Cutoff, Box 15036 www.allegromicro.com Allegro MicroSystems, Inc. ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC ..........................................28 V Reverse-Supply Voltage, VRCC ........................–18 V Magnetic Flux Density, B .........................Unlimited Operating Temperature Ambient, TA, Range E..................–40ºC to 85ºC Ambient, TA, Range L................–40ºC to 150ºC Maximum Junction, TJ(max)........................165ºC Storage Temperature, TS ..................–65ºC to 170ºC On-chip protection Supply transient protection Reverse-battery protection On-board voltage regulator 3.5 V to 24 V operation Sensitive Two-Wire Chopper-Stabilized Unipolar Hall-Effect Switches Package LH, 3-pin SOT Features and Benefits 1. VCC 2. No connection 3. GND The A1140, A1141, A1142, and A1143 devices are sensitive, two-wire, unipo- lar, Hall effect switches that are factory-programmed at end-of-line to optimize magnetic switchpoint accuracy. These devices are produced on the Allegro MicroSystems advanced BiCMOS wafer fabrication process, which implements a patented, high-frequency, chopper-stabilization technique that achieves magnetic stability and eliminates the offsets that are inherent in single-element devices exposed to harsh application environments. Commonly found in a number of automotive applications, the A1140-43 family of devices are utilized to sense: seat track position, seat belt buckle presence, hood/trunk latching, and shift selector position. Two-wire unipolar switches are particularly advantageous in price-sensitive appli- cations, because they require one less wire than the more traditional open-collec- tor output switches. Additionally, the system designer gains inherent diagnostics because output current normally flows in either of two narrowly-specified ranges. Any output current level outside of these two ranges is a fault condition. The A1140-43 family of devices also features on-chip transient protection, and a Zener clamp to protect against overvoltage conditions on the supply line. The output currents of the A1141 and A1143 switch HIGH in the presence of a south polarity magnetic field of sufficient strength; and switch LOW otherwise, including when there is no significant magnetic field present. The A1140 and A1142 have inverted output current levels: switching LOW in the presence of a south polarity magnetic field of sufficient strength, and HIGH otherwise. The devices also differ in their specified LOW current supply levels. All family members are offered in two package styles: SOT-23W, a miniature low- profile package for surface-mount applications (suffix –LH), and TO-92, three- lead ultra-mini Single Inline Package (SIP) for through-hole mounting (suffix –UA). Field-programmable versions are also available. Refer to: A1180, A1181, A1182, and A1183. NC 1 2 3 PTCT 1 2 3 1. VCC 2. GND 3. GND Package UA, 3-pin SIP Chopper stabilization Low switchpoint drift over operating tem- perature range Low stress sensitivity Factory programmed at end-of-line for optimized switchpoints |
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