RLD60P090XFF Equivalent & Substitute Parts

Part Overview

The RLD60P090XFF is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 60V maximum voltage with 900 mA hold current. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The part functions as a thermal protection device in through-hole radial configuration, suitable for applications requiring automatic current limiting and thermal reset capability.

Substiute Parts

RLD60P090XFF

Littelfuse Inc.In Stock: 996RLD60P090XFF Datasheet

Current PartRFQ

60R090XPR

Littelfuse Inc.In Stock: 820360R090XPR Datasheet

DirectRFQ

PFRA.090

SCHURTER Inc.In Stock: 1477PFRA.090 Datasheet

MFR RecommendedRFQ

PFRA.090.2

SCHURTER Inc.In Stock: 1167PFRA.090.2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RLD60P090XFF is determined by strict equivalence across the following critical parameters:

• Voltage - Max: 60V (exact match required)
• Current - Hold (Ih) (Max): 900 mA (exact match required)
• Current - Trip (It): 1.8 A (exact match required)
• Current - Max: 40 A (exact match required)
• Time to Trip: 7.2 s (exact match required)
• Resistance - Post Trip (R1) (Max): 470 mOhms (exact match required)
• Operating Temperature: -40°C ~ 85°C (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Disc (exact match required)
• Lead Spacing: 0.201" (5.10mm) (exact match required)
• Type: Polymeric (exact match required)
• Approval Agency: cURus, TUV (exact match required)
• RoHS Status: ROHS3 Compliant (exact match required)

Variations in initial resistance (Ri), physical dimensions within tolerance, and packaging format (bulk vs. cut tape) do not disqualify substitution when all critical parameters align.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts (60R090XPR, PFRA.090, PFRA.090.2) meet the electrical and mechanical requirements for direct substitution with the obsolete RLD60P090XFF. Selection should be based on the following factors:

60R090XPR (Littelfuse Inc.): This part maintains manufacturer continuity with the original component, originating from the same manufacturer as the RLD60P090XFF. Active product status ensures long-term availability. The part is available in cut tape packaging format.

PFRA.090 (SCHURTER Inc.): This part represents a cross-manufacturer equivalent with active product status. It is supplied in bulk packaging format, suitable for high-volume production environments. REACH compliance status is documented as unaffected.

PFRA.090.2 (SCHURTER Inc.): This variant is the cut tape packaged version of PFRA.090, offering the same electrical and mechanical specifications with alternative packaging. It is the base product variant with documented REACH compliance.

All candidates carry cURus and TUV approvals, maintain ROHS3 compliance, and operate within the specified temperature range. Initial resistance (Ri) variation between Littelfuse and SCHURTER parts (200 mOhms vs. 140 mOhms minimum) does not affect substitution eligibility, as post-trip resistance remains constant at 470 mOhms maximum across all parts.

Frequently Asked Questions (FAQ)

Q: Can 60R090XPR directly replace RLD60P090XFF in existing designs?

A: Yes. The 60R090XPR meets all critical electrical and mechanical parameters. The primary difference is product status (active vs. obsolete) and packaging format (cut tape vs. radial disc). Physical dimensions and lead spacing are compatible with existing PCB layouts.

Q: What is the difference between PFRA.090 and PFRA.090.2?

A: Both parts are electrically and mechanically identical. PFRA.090 is supplied in bulk packaging, while PFRA.090.2 is supplied in cut tape format. PFRA.090.2 is designated as the cut tape variant of the base product PFRA.090. Selection depends on assembly process requirements.

Q: Does the lower initial resistance (Ri) of SCHURTER parts affect circuit performance?

A: No. The initial resistance specification (140 mOhms minimum for SCHURTER vs. 200 mOhms minimum for Littelfuse) represents a tighter tolerance on the lower bound. Post-trip resistance remains constant at 470 mOhms maximum across all parts, which is the critical parameter for circuit protection function.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All three substitute parts carry ROHS3 Compliant status, matching the original RLD60P090XFF specification.

Q: Which substitute part should be selected for new production?

A: Selection depends on supply chain and assembly requirements. 60R090XPR provides manufacturer continuity with Littelfuse. PFRA.090 and PFRA.090.2 offer cross-manufacturer alternatives with active status and higher inventory levels. All three parts are electrically and mechanically equivalent.

Q: Are thermal and electrical characteristics identical across all substitute parts?

A: Yes. All substitute parts maintain identical voltage rating (60V), hold current (900 mA), trip current (1.8 A), time to trip (7.2 s), post-trip resistance (470 mOhms maximum), and operating temperature range (-40°C ~ 85°C).