Equivalent & Substitute Parts for AA77A10

Part Overview

The AA77A10 is a thermal cutoff (TCO) device manufactured by Bourns Inc., classified as a nonstandard strap solder breaker. This component is designed for AC/DC applications with a rated functioning temperature of 77°C (171°F) and a current rating of 35 A at 28 V DC. The part is currently listed as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and component procurement.

Substiute Parts

AA77A10

Bourns Inc.In Stock: 1132AA77A10 Datasheet

Current PartRFQ

AC77A1D

Bourns Inc.In Stock: 1229AC77A1D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AA77A10 is determined by the following critical parameters:

• Current Rating: 35 A (exact match required)
• Voltage Rating - DC: 28 V (exact match required)
• Rated Functioning Temperature: 77°C (exact match required)
• Reset Temperature: 40°C (exact match required)
• Package / Case: Nonstandard (physical compatibility required)
• Approval Agencies: cUL, TUV, UL (regulatory compliance required)
• Type: Thermal Cutoff Breaker (functional equivalence required)

The AC77A1D meets all critical electrical and thermal parameters specified for the AA77A10, maintaining identical current and voltage ratings, functioning temperature, and reset temperature. Both components carry equivalent regulatory approvals (cUL, TUV, UL) and comply with RoHS3 requirements.

Parameter Comparison

Engineering Selection Recommendations

The AC77A1D is the designated manufacturer-recommended substitute for the obsolete AA77A10. Both components are manufactured by Bourns Inc. and maintain identical electrical specifications: 35 A current rating, 28 V DC voltage rating, 77°C functioning temperature, and 40°C reset temperature. The AC77A1D carries active product status, ensuring ongoing availability and supply chain continuity. Both parts maintain equivalent regulatory certifications (cUL, TUV, UL), supporting compliance requirements in applications requiring thermal protection in AC/DC circuits. The nonstandard package configuration is consistent between both parts, ensuring mechanical compatibility in existing designs.

Frequently Asked Questions (FAQ)

Q: Can the AC77A1D directly replace the AA77A10 in existing designs?

A: Yes. The AC77A1D matches all critical electrical parameters: 35 A current rating, 28 V DC voltage rating, 77°C functioning temperature, and 40°C reset temperature. Both components feature identical nonstandard package configurations and equivalent regulatory approvals (cUL, TUV, UL).

Q: What is the primary reason for substitution?

A: The AA77A10 is classified as obsolete. The AC77A1D is the manufacturer-recommended equivalent with active product status, ensuring continued availability and supply chain support.

Q: Are the regulatory certifications equivalent?

A: Yes. Both the AA77A10 and AC77A1D carry identical approval agencies: cUL, TUV, and UL. This maintains regulatory compliance in applications requiring thermal protection certification.

Q: Is the package configuration identical?

A: Both components use nonstandard package configurations. Physical compatibility is maintained for strap solder mounting applications.

Q: What are the key parameters that must match for substitution?

A: Current rating (35 A), voltage rating (28 V DC), rated functioning temperature (77°C), reset temperature (40°C), package type (nonstandard), and regulatory approvals (cUL, TUV, UL) must remain consistent for functional equivalence.