A1146LUA-T Equivalent & Substitute Parts

Part Overview

The A1146LUA-T is a unipolar Hall Effect magnetic switch manufactured by Allegro MicroSystems, designed for digital switching applications with current source output. This component operates across a wide temperature range (-40°C to 150°C) and is qualified to automotive standards (AEC-Q100). The part is currently classified as obsolete, making identification of compatible substitutes essential for ongoing system support and new design implementations.

Substiute Parts

A1146LUA-T

Allegro MicroSystemsIn Stock: 1442A1146LUA-T Datasheet

Current PartRFQ

A1156LUA-T

Allegro MicroSystemsIn Stock: 44472A1156LUA-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the A1146LUA-T is determined by strict equivalence across the following critical parameters:

• Functional Type: Unipolar Hall Effect switch with current source output
• Sensing Characteristics: South pole polarization with 6mT trip and 1mT release thresholds
• Electrical Specifications: Supply voltage range, maximum supply current, and output type
• Thermal Performance: Operating temperature range of -40°C to 150°C
• Physical Form Factor: 3-SSIP package with through-hole mounting
• Compliance & Qualification: Automotive-grade with AEC-Q100 qualification and ROHS3 compliance

The A1156LUA-T meets all these criteria and is identified as the manufacturer-recommended substitute.

Parameter Comparison

Engineering Selection Recommendations

The A1156LUA-T is the direct substitute for the obsolete A1146LUA-T. Both components share identical functional specifications, sensing characteristics, and electrical performance parameters. The A1156LUA-T maintains full compatibility with existing designs while offering the advantage of active product status and established supply availability (44,400 units in stock versus 1,415 units for the obsolete part).

The minimum supply voltage specification differs slightly (3V versus 4.6V for the main part), representing an expanded operating range that does not compromise compatibility. Both parts maintain AEC-Q100 automotive qualification and ROHS3 compliance, ensuring continued suitability for regulated applications.

Frequently Asked Questions (FAQ)

Q: Can the A1156LUA-T be used as a direct replacement for the A1146LUA-T in existing designs?

A: Yes. The A1156LUA-T is the manufacturer-recommended substitute and maintains identical functional specifications, sensing thresholds, electrical ratings, temperature performance, and package form factor. No circuit modifications are required.

Q: What is the difference in supply voltage specifications between these parts?

A: The A1146LUA-T operates from 4.6V to 24V, while the A1156LUA-T operates from 3V to 24V. The A1156LUA-T has an expanded lower voltage limit, making it compatible with a broader range of supply conditions. This does not affect compatibility in applications designed for the original part.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the A1146LUA-T and A1156LUA-T carry automotive-grade classification with AEC-Q100 qualification, meeting automotive industry reliability and qualification standards.

Q: What is the packaging and mounting configuration?

A: Both parts use the 3-SSIP package with through-hole mounting. The physical footprint and pin configuration are identical, allowing direct board-level substitution without layout modifications.

Q: Why is the A1146LUA-T listed as obsolete?

A: The A1146LUA-T has reached end-of-life status. The A1156LUA-T is the active replacement part maintained by Allegro MicroSystems for continued system support and new designs.