Littelfuse RUEF160-1 PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The RUEF160-1 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 30V maximum voltage and 1.6A hold current. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs. The part functions as an automatic reset protection device in through-hole radial configuration, suitable for applications requiring overcurrent protection with automatic recovery capability.

Substiute Parts

RUEF160-1

Littelfuse Inc.In Stock: 1221RUEF160-1 Datasheet

Current PartRFQ

RUEF160

LittelfuseIn Stock: 3152RUEF160 Datasheet

MFR RecommendedRFQ

RUEF160S

Littelfuse Inc.In Stock: 1297RUEF160S Datasheet

Parametric EquivalentRFQ

FRU160-30F

RFE/FuzetecIn Stock: 1357FRU160-30F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RUEF160-1 is determined by strict equivalence across the following critical parameters:

• Voltage rating: 30V maximum
• Hold current (Ih): 1.6A maximum
• Trip current (It): 3.2A
• Time to trip: 8 seconds
• Initial resistance: 30 mOhms minimum
• Post-trip resistance: 110 mOhms maximum
• Operating temperature range: -40°C to 85°C
• Mounting configuration: Through hole radial disc
• Physical dimensions and lead spacing compatibility

All identified substitutes maintain identical electrical characteristics and mechanical form factors within the specified tolerances. Packaging differences (bag, bulk) do not affect functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

RUEF160 (Littelfuse) is the manufacturer-recommended substitute for the obsolete RUEF160-1. This part maintains active product status with identical electrical and mechanical specifications. All regulatory certifications (CQC, CSA, TUV, UL) and RoHS3 compliance are preserved.

RUEF160S (Littelfuse Inc.) is a parametric equivalent offering identical performance characteristics with active product status. This part is suitable for applications where bulk packaging is preferred.

FRU160-30F (RFE/Fuzetec) is a direct functional equivalent from an alternative manufacturer. All critical electrical parameters match the original specification. Lead spacing tolerance is 0.201" (5.10mm) compared to 0.199" (5.05mm) for Littelfuse variants, representing a 0.05mm difference within typical PCB design tolerances. This part carries UL, cUL, and TUV certifications and maintains RoHS3 compliance.

Selection between these substitutes should be based on supply availability, packaging requirements, and established supplier relationships. All three parts are electrically and mechanically interchangeable for the specified application.

Frequently Asked Questions (FAQ)

Q: Can RUEF160 directly replace RUEF160-1 in existing designs?

A: Yes. RUEF160 is the manufacturer-recommended substitute with identical electrical ratings (30V, 1.6A hold current, 3.2A trip current), mechanical dimensions, and lead spacing. The only difference is product status (active vs. obsolete) and packaging format.

Q: What is the difference between RUEF160 and RUEF160S?

A: Both parts are manufactured by Littelfuse with identical electrical and mechanical specifications. The primary difference is packaging: RUEF160 is supplied in bag format, while RUEF160S is supplied in bulk. Both maintain active product status and full regulatory compliance.

Q: Is FRU160-30F compatible with PCBs designed for RUEF160-1?

A: Yes. FRU160-30F matches all critical electrical parameters and physical dimensions. Lead spacing is 0.201" (5.10mm) versus 0.199" (5.05mm) for the Littelfuse parts, a 0.05mm difference that falls within standard PCB manufacturing tolerances. Mechanical fit and electrical performance are equivalent.

Q: Are all substitutes RoHS3 compliant?

A: Yes. RUEF160, RUEF160S, and FRU160-30F are all RoHS3 compliant, matching the compliance status of the original RUEF160-1.

Q: Which substitute should be selected for new designs?

A: RUEF160 or RUEF160S (both Littelfuse) are preferred for new designs due to active product status and established supply chains. FRU160-30F is a valid alternative where Littelfuse parts are unavailable. All three parts meet identical functional requirements.

Q: Do packaging differences affect electrical performance?

A: No. Packaging format (bag vs. bulk) does not affect electrical characteristics, performance, or reliability. Selection should be based on procurement volume and inventory management requirements.