TR250-080U Equivalent & Substitute Parts

Part Overview

The TR250-080U is a Polymeric PTC Resettable Fuse manufactured by Littelfuse, part of the PolySwitch® series. This component is rated for 250V (60V internal) with an 80 mA hold current and is designed for through-hole radial mounting in disc configuration. The product is currently obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

TR250-080U

LittelfuseIn Stock: 1086TR250-080U Datasheet

Current PartRFQ

TRF250-080U

Littelfuse Inc.In Stock: 1421TRF250-080U Datasheet

DirectRFQ

250R080U

Littelfuse Inc.In Stock: 1765250R080U Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TR250-080U is determined by the following critical parameters:

• Voltage Rating: The substitute must support the same maximum voltage specification (250V external / 60V internal rating)
• Current - Hold (Ih): Must match or exceed 80 mA to maintain equivalent circuit protection
• Current - Max: Must support 3 A maximum current capacity
• Resistance Characteristics: Initial resistance (Ri) minimum of 14 Ohms and post-trip resistance (R1) maximum of 33 Ohms ensure equivalent electrical behavior
• Operating Temperature: Must maintain -40°C to 85°C operating range
• Mounting Configuration: Through-hole radial disc mounting is required for mechanical compatibility
• Approval Certifications: CSA, TUV, and UL certifications ensure regulatory compliance

The identified substitutes maintain these core electrical and mechanical parameters while offering improved product status and compliance ratings.

Parameter Comparison

Engineering Selection Recommendations

TRF250-080U is the primary substitute for TR250-080U. Both components share identical electrical specifications (80 mA hold current, 3 A maximum current, 14 Ohms minimum initial resistance, 33 Ohms maximum post-trip resistance) and mechanical dimensions (0.189" diameter, 0.150" thickness, 0.197" lead spacing). TRF250-080U is currently active in production and complies with ROHS3 standards, addressing the RoHS non-compliance of the obsolete TR250-080U. Certifications include CSA, TUV, and UL approval.

250R080U is an alternative substitute from the POLY-FUSE® 250R series. This component maintains all critical electrical parameters and operating temperature range. However, it features slightly larger physical dimensions (0.228" diameter, 0.181" thickness, 0.390" seated height, 0.201" lead spacing) compared to the original TR250-080U. The 250R080U is ROHS3 compliant and carries cURus and TUV certifications. This substitute is suitable for applications where the increased footprint does not present mechanical constraints.

For new designs and ongoing support of obsolete TR250-080U applications, TRF250-080U is the preferred selection due to dimensional compatibility and complete certification alignment.

Frequently Asked Questions (FAQ)

Q: Can TRF250-080U directly replace TR250-080U in existing designs?

A: Yes. TRF250-080U maintains identical electrical specifications (80 mA hold current, 3 A maximum current, 14 Ohms initial resistance, 33 Ohms post-trip resistance) and mechanical dimensions (0.189" diameter, 0.150" thickness, 0.197" lead spacing). Both are through-hole radial disc configurations with -40°C to 85°C operating temperature range.

Q: What are the differences between TRF250-080U and 250R080U?

A: Both substitutes maintain equivalent electrical performance. The primary difference is physical size: TRF250-080U matches the original TR250-080U dimensions (0.189" diameter, 0.150" thickness), while 250R080U is larger (0.228" diameter, 0.181" thickness, 0.390" seated height). Lead spacing differs slightly (0.197" versus 0.201"). Both are ROHS3 compliant and carry appropriate regulatory certifications.

Q: Why is the time to trip specification different between TR250-080U and the substitutes?

A: TR250-080U specifies 3 seconds time to trip, while TRF250-080U and 250R080U specify 4 seconds. Both substitutes maintain the same hold current (80 mA) and trip current (160 mA) characteristics. The extended trip time does not affect the core protection function for applications designed around the 80 mA hold current specification.

Q: Are there packaging considerations when selecting between substitutes?

A: TRF250-080U is supplied in bag packaging, while 250R080U is supplied in bulk packaging. Both are available in production quantities. Selection should be based on procurement and inventory management requirements.

Q: What compliance improvements do the substitutes offer?

A: TR250-080U is RoHS non-compliant. Both TRF250-080U and 250R080U are ROHS3 compliant, meeting current environmental and regulatory requirements. Both maintain CSA, TUV, and UL certifications (250R080U carries cURus and TUV certifications).