Two Wire Hall-Effect Latch - Allegro MicroSystems
Description
A1245
Chopper-Stabilized Two-Wire Hall-Effect Latch
FEATURES AND BENEFITS
• 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
Not to scale
3-pin ultramini SIP
1.
5 × 4 × 3 mm (suffix UA)
3-pin SOT23-W 2 × 3 × 1 mm (suffix LH)
DESCRIPTION
The A1245 is a two-wire Hall-effect latch.
The device is produced on theAllegro™ advanced BiCMOS wafer fabrication process, which implements a 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 surfacemount 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.
VCC V+
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