A1145LLHLT Equivalent & Substitute Parts

Part Overview

The A1145LLHLT is a unipolar Hall Effect magnetic switch manufactured by Allegro MicroSystems, designed for automotive-grade applications requiring digital switching based on magnetic field detection. This component operates as a current source output device in a surface mount SOT-23W package. The part is classified as obsolete, making equivalent substitute components necessary for ongoing design support, production continuity, and system maintenance.

Substiute Parts

A1145LLHLT

Allegro MicroSystemsIn Stock: 675A1145LLHLT Datasheet

Current PartRFQ

TLE49761KHTSA1

Ampleon USA Inc.In Stock: 276546TLE49761KHTSA1 Datasheet

MFR RecommendedRFQ

TLE49762KHTSA1

Infineon TechnologiesIn Stock: 1100TLE49762KHTSA1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the A1145LLHLT is determined by the following critical parameters:

Core Functional Requirements:

• Hall Effect technology for magnetic field detection
• Unipolar switch operation with South Pole polarization
• Automotive-grade classification with AEC-Q100 qualification
• Operating temperature range of -40°C to 150°C
• Supply voltage compatibility within 4.6V ~ 24V range
• Maximum supply current of 17mA or lower

Mechanical Compatibility:

• Surface mount packaging
• Pin configuration compatible with SOT-23W or equivalent three-pin packages

The substitute parts TLE49761KHTSA1 and TLE49762KHTSA1 meet these core requirements. However, they differ in output type: TLE49761KHTSA1 maintains current source output, while TLE49762KHTSA1 uses open collector output. This distinction affects circuit interface design and must be evaluated during selection.

Parameter Comparison

Engineering Selection Recommendations

TLE49762KHTSA1 (Infineon Technologies) is the primary substitute for new designs and production continuity. This part maintains automotive-grade classification with AEC-Q100 qualification, operates across the required temperature range (-40°C ~ 150°C), and provides equivalent supply current specifications (17mA maximum). The component is actively manufactured and ROHS3 compliant, supporting modern regulatory requirements. The open collector output requires pull-up resistor configuration in the circuit interface, which differs from the current source output of the original part.

TLE49761KHTSA1 (Ampleon USA Inc.) is an alternative option that preserves current source output topology, eliminating output stage redesign. However, limited parameter documentation in the provided data restricts full compatibility verification. This part is actively produced and available in bulk packaging.

Both substitutes are Hall Effect unipolar switches suitable for automotive applications. Selection between them depends on circuit interface requirements: open collector output (TLE49762KHTSA1) versus current source output (TLE49761KHTSA1).

Frequently Asked Questions (FAQ)

Q: Can TLE49762KHTSA1 directly replace A1145LLHLT without circuit modification?

A: Direct pin-for-pin replacement is possible due to compatible SOT-23 package families. However, the output type differs: A1145LLHLT uses current source output while TLE49762KHTSA1 uses open collector output. This requires pull-up resistor addition to the output stage. Verify load impedance and signal conditioning requirements before implementation.

Q: What is the difference between current source and open collector outputs?

A: Current source output provides a constant current signal independent of load impedance, suitable for direct interface with high-impedance inputs. Open collector output requires external pull-up resistor to establish logic levels, offering flexibility in voltage level selection but requiring additional component integration.

Q: Are both substitute parts automotive-qualified?

A: TLE49762KHTSA1 carries automotive-grade classification with AEC-Q100 qualification. TLE49761KHTSA1 automotive qualification status is not specified in the provided data. Verify qualification documentation with the manufacturer before automotive application deployment.

Q: What is the supply voltage compatibility range for substitutes?

A: TLE49762KHTSA1 operates across 3V ~ 18V, which is narrower than the original A1145LLHLT range of 4.6V ~ 24V. Verify system supply voltage falls within 3V ~ 18V before selection. TLE49761KHTSA1 supply voltage range is not specified in the provided data.

Q: Are the substitute parts RoHS compliant?

A: TLE49762KHTSA1 is ROHS3 compliant. TLE49761KHTSA1 RoHS status is not specified in the provided data. The original A1145LLHLT is RoHS non-compliant. Verify RoHS compliance requirements for your application and regulatory jurisdiction.

Q: What packaging options are available for the substitute parts?

A: TLE49762KHTSA1 is supplied in Tape & Reel (TR) packaging. TLE49761KHTSA1 is available in Bulk packaging. Confirm packaging format compatibility with your procurement and assembly processes.