MHP-TAC6-12-77 Equivalent & Substitute Parts

Part Overview

The MHP-TAC6-12-77 is a thermal cutoff (TCO) breaker manufactured by Littelfuse Inc., designed for AC/DC applications with a 77°C (171°F) functioning temperature and 25 A current rating. This component operates as a single-pole, single-throw, normally closed (SPST-NC) strap-mounted thermostat.

The MHP-TAC6-12-77 carries a "Not For New Designs" product status, indicating it has been superseded in the manufacturer's active product line. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for existing applications and legacy system support.

Substiute Parts

MHP-TAC6-12-77

Littelfuse Inc.In Stock: 881MHP-TAC6-12-77 Datasheet

Current PartRFQ

MHP-TAC6-12-77N

Littelfuse Inc.In Stock: 809MHP-TAC6-12-77N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MHP-TAC6-12-77 is determined by strict equivalence across the following critical parameters:

• Rated Functioning Temperature: 77°C (171°F)
• Reset Temperature: 40°C (104°F)
• Voltage Rating - DC: 12 V
• Current Rating: 25 A
• Configuration: SPST-NC Strap
• Package / Case: Nonstandard
• Series Compatibility: MHP-TAC

Only parts matching all these parameters across the same manufacturer series qualify as direct substitutes. Deviations in any parameter render a part incompatible for direct replacement.

Parameter Comparison

Engineering Selection Recommendations

The MHP-TAC6-12-77N is the manufacturer-recommended substitute for the MHP-TAC6-12-77. Both parts are electrically and mechanically identical across all functional parameters: 77°C functioning temperature, 40°C reset temperature, 12 V DC rating, and 25 A current capacity.

The primary distinction is product status: the MHP-TAC6-12-77 is designated "Not For New Designs," while the MHP-TAC6-12-77N carries "Active" status. This designation indicates that the MHP-TAC6-12-77N represents the current production equivalent within the MHP-TAC series.

Both parts maintain ROHS3 compliance and identical moisture sensitivity ratings, ensuring regulatory and environmental consistency. Selection between these parts should be based on application timeline and supply chain requirements: the MHP-TAC6-12-77N is the preferred choice for ongoing production and new applications, while the MHP-TAC6-12-77 remains suitable for legacy system maintenance where existing inventory is available.

Frequently Asked Questions (FAQ)

Q: Can the MHP-TAC6-12-77N directly replace the MHP-TAC6-12-77 in existing designs?

A: Yes. The MHP-TAC6-12-77N is electrically and mechanically equivalent to the MHP-TAC6-12-77 across all critical parameters: functioning temperature, reset temperature, voltage rating, current rating, and physical configuration. Direct substitution is supported without circuit or mechanical modifications.

Q: What is the significance of the "Not For New Designs" status on the MHP-TAC6-12-77?

A: This designation indicates the part has been superseded in the manufacturer's active product line. The MHP-TAC6-12-77N is the active equivalent. For new designs and ongoing production, the MHP-TAC6-12-77N should be specified.

Q: Are there any compliance or certification differences between these parts?

A: No. Both parts maintain identical RoHS3 compliance status and moisture sensitivity ratings (MSL 1 - Unlimited). No additional testing or certification changes are required when substituting between these parts.

Q: Does the nonstandard package affect substitution compatibility?

A: The nonstandard package designation applies to both parts identically. Mechanical mounting and electrical connection points remain consistent, ensuring direct physical and electrical compatibility.

Q: What inventory considerations should guide part selection?

A: The MHP-TAC6-12-77 has 858 pieces in stock, while the MHP-TAC6-12-77N has 720 pieces available. For immediate requirements, either part is suitable. For long-term supply assurance, the MHP-TAC6-12-77N (active status) is the recommended choice.