A1143LLHLT Equivalent & Substitute Parts

Part Overview

The A1143LLHLT 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, maintenance, and new production requirements where the original part is no longer available from primary sources.

Substiute Parts

A1143LLHLT

Allegro MicroSystemsIn Stock: 851A1143LLHLT 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 eligibility for the A1143LLHLT is determined by the following critical parameters:

• Function & Technology: Unipolar Hall Effect switch operation
• Polarization: South Pole detection capability
• Supply Voltage Range: Compatibility within 4.6V ~ 24V envelope
• Maximum Supply Current: 17mA maximum rating
• Operating Temperature Range: -40°C ~ 150°C
• Automotive Grade & AEC-Q100 Qualification: Required for automotive applications
• Mounting Type: Surface mount configuration
• Output Characteristics: Current source or open collector output types acceptable for circuit-level substitution

The identified substitute parts TLE49761KHTSA1 and TLE49762KHTSA1 meet these core substitution criteria. Both are active Hall Effect unipolar switches with South Pole polarization, automotive qualification, and compatible operating temperature ranges. Output type variation (current source vs. open collector) is permissible when circuit design accommodates the output stage difference.

Parameter Comparison

Engineering Selection Recommendations

TLE49762KHTSA1 (Infineon Technologies) is the primary substitute for the A1143LLHLT. This part maintains active product status, carries AEC-Q100 automotive qualification, operates across the -40°C ~ 150°C temperature range, and is ROHS3 compliant. The supply voltage range of 3V ~ 18V overlaps the original part's 4.6V ~ 24V specification within the 4.6V ~ 18V window, suitable for most automotive applications. The open collector output requires circuit-level verification but is functionally compatible with current source designs through appropriate pull-up resistor configuration. The TO-236-3/SC-59/SOT-23-3 package footprint is mechanically compatible with SOT-23W layouts.

TLE49761KHTSA1 (Ampleon USA Inc.) is listed as an alternative substitute. However, critical electrical parameters including supply voltage range, maximum supply current, output type, operating temperature, automotive grade status, and AEC-Q100 qualification are not specified in available documentation. This part should be selected only when TLE49762KHTSA1 is unavailable and detailed datasheet verification confirms compatibility with the original A1143LLHLT electrical and thermal requirements.

Frequently Asked Questions (FAQ)

Q: Can TLE49762KHTSA1 directly replace A1143LLHLT in existing designs?

A: TLE49762KHTSA1 is functionally equivalent for unipolar Hall Effect switching applications. The primary design consideration is output type: the original A1143LLHLT uses current source output, while TLE49762KHTSA1 uses open collector output. Circuits designed for current source operation require pull-up resistor addition for open collector compatibility. Verify supply voltage compatibility within the 4.6V ~ 18V overlap range.

Q: What is the package compatibility between A1143LLHLT (SOT-23W) and TLE49762KHTSA1 (TO-236-3/SC-59/SOT-23-3)?

A: SOT-23W and SC-59 (TO-236-3) are mechanically and electrically compatible surface mount packages with identical pin configurations for three-terminal Hall Effect switches. PCB footprints are interchangeable.

Q: Why is TLE49761KHTSA1 listed as a substitute if key parameters are unspecified?

A: TLE49761KHTSA1 is included based on manufacturer documentation indicating it as an equivalent part. However, incomplete parameter specification in available data requires full datasheet review before design implementation. Contact the component supplier or manufacturer for complete electrical and thermal specifications.

Q: Is RoHS compliance a substitution requirement?

A: The original A1143LLHLT is RoHS non-compliant. TLE49762KHTSA1 is ROHS3 compliant. For applications with RoHS compliance mandates, TLE49762KHTSA1 satisfies regulatory requirements. For legacy systems without RoHS requirements, both compliant and non-compliant substitutes are acceptable from a functional standpoint.

Q: What is the sensing range specification for substitute parts?

A: The sensing range (trip and release thresholds) for TLE49761KHTSA1 and TLE49762KHTSA1 is not provided in the available parameter data. Obtain detailed datasheets from Ampleon USA Inc. and Infineon Technologies respectively to confirm sensing range compatibility with the original A1143LLHLT specification of 11mT trip and 4.5mT release.