A1147LLHLT Equivalent & Substitute Parts

Part Overview

The A1147LLHLT is a unipolar magnetic switch manufactured by Allegro MicroSystems, utilizing Hall Effect technology for digital switching applications. This component is classified as obsolete, necessitating identification of active equivalent parts to maintain supply chain continuity for existing designs and new production requirements. The part operates across automotive-grade specifications with AEC-Q100 qualification, making substitute selection critical for applications requiring equivalent performance and reliability standards.

Substiute Parts

A1147LLHLT

Allegro MicroSystemsIn Stock: 823A1147LLHLT 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 A1147LLHLT is determined by alignment across the following critical parameters:

Primary Matching Criteria:

• Technology: Hall Effect digital switching
• Function: Unipolar switch operation
• Polarization: South pole detection
• Grade: Automotive-grade qualification
• Qualification: AEC-Q100 compliance
• Operating Temperature Range: -40°C ~ 150°C minimum
• Supply Voltage Compatibility: Overlap within specified ranges
• Supply Current: Maximum 17mA or lower
• Mounting Type: Surface mount configuration

Secondary Considerations:

• Output Type: Current source or open collector configurations acceptable for circuit redesign
• Package compatibility: Physical form factor may differ if PCB layout permits

The identified substitutes TLE49761KHTSA1 and TLE49762KHTSA1 meet these criteria with active product status, ensuring long-term availability and continued manufacturer support.

Parameter Comparison

Engineering Selection Recommendations

TLE49762KHTSA1 (Infineon Technologies) is the primary substitute candidate. This part maintains full alignment with automotive-grade specifications, AEC-Q100 qualification, and operating temperature range. The supply voltage range (3V ~ 18V) overlaps the original specification, and maximum supply current matches at 17mA. The output type differs (open collector vs. current source), requiring circuit evaluation but presenting no fundamental incompatibility for most switching applications. The part is ROHS3 compliant, addressing environmental regulatory requirements. Active product status ensures sustained availability and manufacturer support.

TLE49761KHTSA1 (Ampleon USA Inc.) is identified as a secondary substitute option. Limited parameter specification in available data restricts full compatibility verification. Selection of this part requires detailed datasheet review to confirm voltage supply range, current specifications, and output characteristics against application requirements.

Both substitutes are active products with established supply chains, contrasting with the obsolete status of the original A1147LLHLT.

Frequently Asked Questions (FAQ)

Q: Why is the A1147LLHLT classified as obsolete? A: Allegro MicroSystems has discontinued this part number. Active substitutes with equivalent or superior specifications are available from alternative manufacturers.

Q: Can TLE49762KHTSA1 directly replace A1147LLHLT without circuit modification? A: The parts share core Hall Effect switching functionality, automotive qualification, and operating temperature range. However, the output type differs (open collector vs. current source), requiring circuit evaluation. Package compatibility (TO-236-3/SC-59/SOT-23-3 vs. SOT-23W) must be verified for PCB layout feasibility.

Q: What is the voltage supply compatibility between these parts? A: A1147LLHLT operates at 4.6V ~ 24V. TLE49762KHTSA1 operates at 3V ~ 18V. The overlap range is 4.6V ~ 18V, suitable for most automotive applications within this window.

Q: Are both substitutes automotive-grade qualified? A: TLE49762KHTSA1 carries AEC-Q100 qualification matching the original part. TLE49761KHTSA1 qualification status requires datasheet verification.

Q: What is the significance of the south pole polarization specification? A: South pole polarization determines the magnetic field direction required to trigger the switch. TLE49762KHTSA1 maintains this specification. Verify TLE49761KHTSA1 polarization against application requirements.

Q: Does RoHS compliance affect substitution decisions? A: A1147LLHLT is RoHS non-compliant. TLE49762KHTSA1 is ROHS3 compliant, meeting current environmental regulations. This may be mandatory for new designs or specific markets.

Q: What package considerations apply to these substitutes? A: A1147LLHLT uses SOT-23W packaging. TLE49762KHTSA1 is available in TO-236-3, SC-59, or SOT-23-3 packages. Physical dimensions and PCB footprint compatibility must be confirmed before design implementation.