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A1147 Dataheets PDF



Part Number A1147
Manufacturers Allegro MicroSystems
Logo Allegro MicroSystems
Description (A1147 / A1148) Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
Datasheet A1147 DatasheetA1147 Datasheet (PDF)

A1147 and A1148 Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches Features and Benefits ▪ Chopper stabilization ▫ Low switchpoint drift over operating temperature range ▫ Low sensitivity to stress ▪ Factory programmed at end-of-line for optimized switchpoints ▪ On-chip protection ▫ Supply transient protection ▫ Reverse-battery protection ▫ On-board voltage regulator ▫ 3.5 to 24 V operation Description The A1147 and A1148 devices are two-wire, unipolar, Hall e.

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A1147 and A1148 Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches Features and Benefits ▪ Chopper stabilization ▫ Low switchpoint drift over operating temperature range ▫ Low sensitivity to stress ▪ Factory programmed at end-of-line for optimized switchpoints ▪ On-chip protection ▫ Supply transient protection ▫ Reverse-battery protection ▫ On-board voltage regulator ▫ 3.5 to 24 V operation Description The A1147 and A1148 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 technique, 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 latching, and shift selector position. Two-wire unipolar switches, such as the A1147 and A1148, 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 diagnostics 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 condition. These devices also Packages: 3 pin SOT23W (suffix LH), and 3 pin SIP (suffix UA) www.DataSheet4U.com Continued on the next page… Not to scale Functional Block Diagram V+ VCC Regulator To All Subcircuits 0.01 uF Dynamic Offset Cancellation Clock/Logic Sample and Hold Low-Pass Filter Amp GND Package UA Only GND A1147-DS, Rev. 8 A1147 and A1148 Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches field of sufficient strength, and switch HIGH otherwise. Both versions are offered in two package styles. The LH is a SOT23W, miniature low-profile package for surface-mount applications. The UA is a three-lead ultramini 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: A1180 and A1181. Operating Ambient Temperature, TA (°C) Description (continued) feature on-chip transient protection and a Zener clamp to protect against overvoltage conditions on the supply line. The output currents of the A1148 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 A1147 has an opposite output: the currents switch LOW in the presence of a south-polarity magnetic Selection Guide Part Number A1147ELHLT-T A1147EUA-T A1147EUATI A1147EUATI-T A1147LLHLT-T A1147LUA-T A1147LUATI A1147LUATI-T A1148ELHLT-T A1148EUA-T A1148EUATI A1148EUATI-T A1148LLHLT-T A1148LUA-T A1148LUATI A1148LUATI-T 1Pb-based Pb-Free1 Yes Yes – Yes Yes Yes – Yes Yes Yes – Yes Yes Yes – Yes Packing2 Tape and Reel, 3000 pieces/reel Bulk Bag, 500 pieces/bag Tape and Reel, 2000 pieces/reel Tape and Reel, 3000 pieces/reel Bulk Bag, 500 pieces/bag Tape and Reel, 2000 pieces/reel Tape and Reel, 3000 pieces/reel Bulk Bag, 500 pieces/bag Tape and Reel, 2000 pieces/reel Tape and Reel, 3000 pieces/reel Bulk Bag, 500 pieces/bag Tape and Reel, 2000 pieces/reel Package Surface Mount Through Hole Surface Mount Through Hole Surface Mount Through Hole Surface Mount Through Hole Output Level in South (+) Field3 –40 to 85 Low –40 to 150 –40 to 85 High –40 to 150 variants are being phased out of the product line. a. Certain variants cited in this footnote are in production but have been determined to be LAST TIME BUY. This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: October 31, 2006. Deadlilne for receipt of LAST TIME BUY ORDERS: April 27, 2007. These variants include: A1147ELHLT, A1147EUA, A1147LLHLT, A1147LUA, A1148ELHLT, A1148EUA, and, A1148LLHLT. b. Certain variants cited in this footnote are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: May 1, 2006. These variants include: A1148LUA. 2Contact Allegro for additional packing options. 3South (+) magnetic fields must be of sufficient strength. Absolute Maximum Ratings Characteristic Supply Vol.


74ACT10 A1147 A1148


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