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A1146LUA Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A1146LUA Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 13 page A1145 and A1146 A1145-DS, Rev. 6 Worcester, Massachusetts 01615-0036 (508) 853-5000 115 Northeast Cutoff, Box 15036 www.allegromicro.com Allegro MicroSystems, Inc. ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC ...........................................28V Reverse-Supply Voltage, VRCC ........................–18 V Magnetic Flux Density, B .........................Unlimited Power Dissipation, PD............................ Graph, p. 5 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 to 24 V operation Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches Package LH, 3-pin SOT Features and Benefits The A1145 and A1146 devices are two-wire, unipolar, Hall effect switches that are factory-programmed at end-of-line to optimize ultrasensitive magnetic switchpoint accuracy. These devices use a patented high frequency chopper-stabilization tech- nique, produced using the Allegro advanced BiCMOS wafer fabrication process, to achieve magnetic stability and to eliminate offset inherent in single-element devices exposed to harsh application environments. Commonly found in a number of automotive applications, these switches are utilized to sense seat track position, seat belt buckle presence, hood/trunk latch- ing, and shift selector position. Two-wire unipolar switches, such as the A1145 and A1146, are particularly advantageous in price-sensitive applications because they require one less wire for operation than do switches with the more traditional open-collector output. Additionally, the system designer inherently gains diagnos- tics because there is always output current flowing, which should be in either of two narrow ranges. Any current level not within these ranges indicates a fault con- dition. These devices also feature on-chip transient protection and a Zener clamp to protect against overvoltage conditions on the supply line. The output currents of the A1146 switches HIGH in the presence of a south (+) polarity magnetic field of sufficient strength, and switches LOW otherwise, as in the presence of a weak field or a north (–) polarity field. The A1145 has an oppo- site output: the currents switch LOW in the presence of a south-polarity magnetic field of sufficient strength, and switch HIGH otherwise. Both versions are offered in two package styles. The LH is a SOT-23W, miniature low-profile package for surface-mount applications. The UA is a three-lead ultra- mini SIP for through-hole mounting. Each package is available in a lead (Pb) free version (suffix, –T) with 100% matte tin plated leadframe. Field-programmable versions also available: A1185 and A1186. Package UA, 3-pin SIP Chopper stabilization Low switchpoint drift over operating temperature range Low sensitivity to stress Factory programmed at end-of-line for optimized switchpoints ≈1:1 ≈1:1 |
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