A1185LLHLT Equivalent & Substitute Parts

Part Overview

The A1185LLHLT is a unipolar Hall Effect magnetic switch manufactured by Allegro MicroSystems, designed for automotive-grade applications with AEC-Q100 qualification. This component operates as a digital switch with current source output, featuring programmable trip points and a wide supply voltage range of 4.6V to 24V. The part is classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement continuity.

Substiute Parts

A1185LLHLT

Allegro MicroSystemsIn Stock: 964A1185LLHLT 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 A1185LLHLT is determined by the following critical parameters:

Core Functional Requirements:

• Technology: Hall Effect magnetic sensing
• Function: Unipolar Switch operation
• Polarization: South Pole detection
• Grade: Automotive-rated components
• Qualification: AEC-Q100 certification

Electrical Compatibility Parameters:

• Supply voltage range must encompass or overlap with 4.6V ~ 24V
• Maximum supply current: 17mA
• Operating temperature range: -40°C ~ 150°C minimum

Physical & Packaging Constraints:

• Mounting type: Surface Mount
• Package compatibility: SOT-23W or equivalent three-pin surface mount packages

The identified substitutes (TLE49761KHTSA1 and TLE49762KHTSA1) meet these core criteria as Hall Effect unipolar switches with automotive qualification and compatible operating ranges. Both maintain South Pole polarization and surface mount configuration.

Parameter Comparison

Engineering Selection Recommendations

TLE49762KHTSA1 (Infineon Technologies) is the primary substitute candidate. This component maintains full compatibility across all specified parameters: identical South Pole polarization, matching 17mA maximum supply current, overlapping operating temperature range (-40°C ~ 150°C), automotive grade classification, and AEC-Q100 qualification. The supply voltage range (3V ~ 18V) encompasses the lower portion of the original specification. The package (TO-236-3, SC-59, SOT-23-3) is mechanically compatible with SOT-23W footprints. This part is currently in active production status with 1021 units in stock, ensuring long-term availability. The component achieves ROHS3 compliance, addressing environmental regulatory requirements where applicable.

TLE49761KHTSA1 (Ampleon USA Inc.) is listed as an alternative substitute but lacks detailed electrical parameter specifications in the provided data. This part is active in production with substantial inventory (276,436 units), but the absence of critical parameters (supply voltage range, output type, operating temperature, package specification) prevents full compatibility verification based on available information.

For new designs or procurement decisions, TLE49762KHTSA1 is the recommended substitute due to complete parameter documentation and verified compatibility with the A1185LLHLT specification.

Frequently Asked Questions (FAQ)

Q: Why is the A1185LLHLT obsolete and what does this mean for my application?

A: Obsolete status indicates the manufacturer has discontinued production. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. Transitioning to active substitute parts ensures design continuity and future procurement reliability.

Q: Can TLE49762KHTSA1 directly replace A1185LLHLT in my circuit?

A: TLE49762KHTSA1 is functionally equivalent as a unipolar Hall Effect switch with matching automotive qualification and operating temperature range. However, the output type differs (Open Collector vs. Current Source), requiring circuit-level evaluation. The supply voltage range (3V ~ 18V) is narrower than the original (4.6V ~ 24V), so applications requiring operation above 18V require alternative solutions.

Q: What is the difference between SOT-23W and TO-236-3/SC-59 packages?

A: SOT-23W and SC-59 (TO-236-3) are mechanically compatible three-pin surface mount packages with identical pin spacing and footprint dimensions. These packages are interchangeable for PCB assembly purposes.

Q: Does TLE49762KHTSA1 meet RoHS compliance requirements?

A: Yes, TLE49762KHTSA1 is ROHS3 compliant. The original A1185LLHLT is RoHS non-compliant. If RoHS compliance is required for your application, TLE49762KHTSA1 satisfies this regulatory requirement.

Q: What is the difference between Current Source and Open Collector output types?

A: Current Source output provides a constant current signal, while Open Collector output requires an external pull-up resistor to establish voltage levels. Circuit design modifications may be necessary when transitioning between these output types.

Q: Is TLE49761KHTSA1 a viable substitute?

A: TLE49761KHTSA1 is listed as a manufacturer-recommended substitute but lacks detailed electrical specifications in available documentation. Verification with the component datasheet is necessary before design implementation.