A1145 and A1146: Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches

This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available. Date of status change: October 31, 2011.

Recommended Substitutions: For existing customer transition, and for new customers or new applications, refer to the following parts:

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 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 in sensing seat track position, seat belt buckle presence, hood/trunk latching, 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 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 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 opposite 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 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 are also available: A1185 and A1186.

Also see: A1140-43 and A1147-48.

SAMPLE & BUY

Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
141 John Street, Suite 300
Babylon, NY 11702
Phone: (631)422-2500
Fax: (631)422-2504
Web: www.astrorepinc.com
Email: donna.tweedy@astrorepinc.com

If this is not your local representative, find your local sales rep here.

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  • Features and BenefitsFeatures and Benefits
  • PackagingPackaging
  • Technical DocsTechnical Docs
  • NewsNews
  • Chopper stabilization
    • Low switch-pointing 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

Both A1145 and A1146 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 ultramini SIP for through-hole mounting. Each package is available in a lead (Pb) free version (suffix, –T) with 100% matte tin plated leadframe.

UA/LH Combination

 

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Functional Block Diagram

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A1145ELHLT-T 3-lead SOT -40°C to 85°C Yes View Data Discontinued Contact your
local sales rep
Check Stock
A1145EUA-T 3-lead SIP -40°C to 85°C Yes View Data Discontinued Contact your
local sales rep
Check Stock
A1146ELHLT-T 3-lead SOT -40°C to 85°C Yes View Data Discontinued Contact your
local sales rep
Check Stock
A1146EUA-T 3-lead SIP -40°C to 85°C Yes View Data Discontinued Contact your
local sales rep
Check Stock
A1146LLHLT-T 3-lead SOT -40°C to 150°C Yes View Data Discontinued Contact your
local sales rep
Check Stock
A1146LUA-T 3-lead SIP -40°C to 150°C Yes View Data Discontinued Contact your
local sales rep
Check Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

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