Equivalent & Substitute Parts for AA77AB0

Part Overview

The AA77AB0 is a thermal cutoff (TCO) breaker manufactured by Bourns Inc. in the Komatsulite™ AA series. This component is rated for 35 A at 77°C (171°F) functioning temperature with a 40°C (104°F) reset temperature, suitable for AC/DC applications up to 28 V DC. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued system integration.

Substiute Parts

AA77AB0

Bourns Inc.In Stock: 891AA77AB0 Datasheet

Current PartRFQ

AC77ABD

Bourns Inc.In Stock: 1074AC77ABD Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AA77AB0 is determined by strict equivalence across the following critical parameters:

• Rated functioning temperature: 77°C (171°F)
• Reset temperature: 40°C (104°F)
• Current rating: 35 A
• Voltage rating: 28 V DC
• Approval certifications: cUL, TUV, UL
• RoHS compliance: ROHS3 Compliant

The AC77ABD qualifies as a direct substitute based on identical values across all specified electrical and thermal parameters. Both components are manufactured by Bourns Inc. and maintain equivalent regulatory compliance and environmental standards.

Parameter Comparison

Engineering Selection Recommendations

The AC77ABD is the qualified substitute for the obsolete AA77AB0. Both components maintain identical electrical specifications, thermal operating parameters, and regulatory certifications. The AC77ABD carries active product status, ensuring continued availability and supply chain reliability. Both parts satisfy cUL, TUV, and UL approval requirements and maintain ROHS3 compliance and REACH unaffected status. Selection of the AC77ABD eliminates obsolescence risk while preserving all functional and compliance characteristics required for the application.

Frequently Asked Questions (FAQ)

Q: What makes AC77ABD a valid substitute for AA77AB0?

A: The AC77ABD matches all critical electrical and thermal parameters: 77°C functioning temperature, 40°C reset temperature, 35 A current rating, and 28 V DC voltage rating. Both components carry identical regulatory certifications (cUL, TUV, UL) and environmental compliance status.

Q: Does the package difference affect substitution?

A: Both components are classified as nonstandard package types. The AA77AB0 uses strap solder packaging, while the AC77ABD uses surface-mount device (SMD) packaging in bag format. Package compatibility must be verified against the specific circuit board design and assembly process requirements.

Q: Are there any compliance differences between these parts?

A: No. Both the AA77AB0 and AC77ABD are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 1 - Unlimited). Regulatory and environmental compliance is equivalent.

Q: Why is AA77AB0 obsolete?

A: The AA77AB0 is classified as obsolete by the manufacturer. The AC77ABD, as an active product, represents the current manufacturing equivalent and is the recommended selection for new designs and replacement applications.