A1245: Chopper-Stabilized, Two Wire Hall-Effect Latch

The A1245 is a two-wire Hall-effect latch. The device is produced on the Allegro™ advanced BiCMOS wafer fabrication process, which implements a patented high frequency, 4-phase, chopper-stabilization technique. This technique achieves magnetic stability over the full operating temperature range, and eliminates offsets inherent in devices with a single Hall element that are exposed to harsh application environments.

Two-wire latches are particularly advantageous in cost-sensitive applications because they require one less wire for operation versus the more traditional open-collector output switches. 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.

The Hall-effect latch will be in the high output current state in the presence of a magnetic south polarity field of sufficient magnitude and will remain in this state until a sufficient north polarity field is present.

The device is offered in two package styles. The LH is a SOT-23W style, miniature low profile package for surface-mount applications. The UA is a 3-pin ultra-mini single inline packages (SIP) for through-hole mounting. Both packages are lead (Pb) free, with 100% matte tin leadframe plating.

DATASHEETS
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
  • High speed, 4-phase chopper stabilization
    • Low switchpoint drift throughout temperature range
    • Low sensitivity to thermal and mechanical stresses
  • On-chip protection
    • Supply transient protection
    • Reverse battery protection
  • On-board voltage regulator
    • 3.0 to 24 V operation
  • Operation up to 175°C junction temperature
  • Solid-state reliability
  • Industry leading ISO 7637-2 performance through use of proprietary, 40 V clamping structures
Packages

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Product Image Functional Block Diagram Typical Applications

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A1245LLHLX-I1-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1245LLHLX-I2-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1245LUA-I1-T 3-lead SIP -40°C to 150°C Yes View Data Contact your
local sales rep
Check Stock
A1245LUA-I2-T 3-lead SIP -40°C to 150°C Yes View Data 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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