A1140LLHLT Equivalent & Substitute Parts

Part Overview

The A1140LLHLT 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 where this sensor function is required.

Substiute Parts

A1140LLHLT

Allegro MicroSystemsIn Stock: 724A1140LLHLT 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

Substitute components for the A1140LLHLT are qualified based on the following core substitution criteria:

Primary Matching Parameters:

• Function: Unipolar Switch
• Technology: Hall Effect
• Polarization: South Pole
• Operating Temperature Range: -40°C ~ 150°C
• Grade: Automotive
• Qualification: AEC-Q100
• Mounting Type: Surface Mount

Secondary Compatibility Considerations:

• Supply Voltage Range: Must encompass or be compatible with 4.6V ~ 24V
• Output Type: Current Source or Open Collector (functionally compatible in switching applications)
• Package Type: Surface mount packages suitable for equivalent PCB footprint integration

The identified substitutes TLE49761KHTSA1 and TLE49762KHTSA1 meet the core functional and automotive qualification requirements. Both are active products from established manufacturers, ensuring long-term availability and design support compared to the obsolete A1140LLHLT.

Parameter Comparison

Engineering Selection Recommendations

TLE49762KHTSA1 (Infineon Technologies) is the primary recommended substitute for the A1140LLHLT. This component maintains full automotive qualification (AEC-Q100), matches the operating temperature range (-40°C ~ 150°C), preserves South Pole polarization, and is an active product with established supply chain availability. The component achieves ROHS3 compliance, addressing regulatory requirements beyond the original part. The Open Collector output type is functionally compatible with current source applications in switching circuits. Supply voltage range (3V ~ 18V) is compatible with the original specification, though the upper limit is reduced from 24V to 18V—this must be verified against specific application requirements.

TLE49761KHTSA1 (Ampleon USA Inc.) serves as a secondary substitute option. While classified as active, detailed electrical parameters are not fully specified in available documentation. This component should be selected only when TLE49762KHTSA1 is unavailable or when specific application requirements align with Ampleon's product specifications.

Both substitutes are surface mount Hall Effect sensors suitable for automotive applications. Component selection should be validated against specific circuit requirements, particularly regarding output type compatibility and supply voltage constraints.

Frequently Asked Questions (FAQ)

Q: Why is the A1140LLHLT obsolete and what does this mean for my design?

A: The A1140LLHLT is classified as obsolete by the manufacturer, indicating it is no longer in active production. This necessitates design migration to active substitute components to ensure long-term supply availability, continued technical support, and compliance with current regulatory standards. Substitute parts maintain equivalent functional performance while offering improved availability and compliance status.

Q: What are the key differences between the A1140LLHLT and TLE49762KHTSA1?

A: Both components are unipolar Hall Effect switches with South Pole polarization and automotive-grade qualification. Primary differences include: output type (Current Source vs. Open Collector), supply current (5mA vs. 17mA maximum), upper supply voltage limit (24V vs. 18V), and RoHS compliance status (non-compliant vs. ROHS3 compliant). The TLE49762KHTSA1 includes temperature compensation as an additional feature.

Q: Are the package types compatible between the A1140LLHLT and substitute parts?

A: The A1140LLHLT uses SOT-23W packaging. The TLE49762KHTSA1 uses PG-SC59-3 packaging (equivalent to TO-236-3, SC-59, SOT-23-3). While both are surface mount packages in the SOT-23 family, physical footprint verification is required before PCB integration. Consult manufacturer datasheets for precise pin configuration and land pattern specifications.

Q: Can I directly replace the A1140LLHLT with TLE49762KHTSA1 without circuit modifications?

A: Direct replacement requires validation of output type compatibility. The A1140LLHLT provides Current Source output, while TLE49762KHTSA1 provides Open Collector output. Circuit design must accommodate this output type difference. Additionally, supply voltage limits (18V maximum for TLE49762KHTSA1 vs. 24V for A1140LLHLT) must be verified against application requirements. Pin-to-pin compatibility and functional behavior should be confirmed through detailed datasheet comparison.

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

A: The A1140LLHLT operates at 4.6V ~ 24V. The TLE49762KHTSA1 operates at 3V ~ 18V, providing lower minimum voltage but reduced maximum voltage. Applications requiring supply voltages above 18V cannot use TLE49762KHTSA1 without additional circuit design modifications. The TLE49761KHTSA1 supply voltage range is not specified in available documentation.

Q: Are both substitute parts automotive-qualified?

A: TLE49762KHTSA1 carries full automotive qualification (AEC-Q100) and is suitable for automotive applications. TLE49761KHTSA1 automotive qualification status is not specified in available documentation. For automotive applications, TLE49762KHTSA1 is the confirmed qualified substitute.