RLD60P025XFF Equivalent & Substitute Parts

Part Overview

The RLD60P025XFF is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 60V maximum voltage with 250 mA hold current. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The RLD60 series POLY-FUSE® provides automatic overcurrent protection through a positive temperature coefficient mechanism, resetting after fault conditions are cleared.

Key Parameters

Parameter	RLD60P025XFF
Voltage - Max	60V
Current - Hold (Ih) (Max)	250 mA
Current - Trip (It)	500 mA
Resistance - Initial (Ri) (Min)	1.25 Ohms
Resistance - Post Trip (R1) (Max)	3 Ohms
Time to Trip	2.5 s
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Lead Spacing	0.201" (5.10mm)
Approval Agency	cURus, TUV
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the RLD60P025XFF is determined by the following critical parameters:

Electrical Equivalence Criteria:

Voltage - Max: 60V (minimum requirement; higher voltage ratings are acceptable)
Current - Hold (Ih): 250 mA (exact match required for circuit protection design)
Current - Trip (It): 500 mA (exact match required)
Resistance - Initial (Ri): 1.25 Ohms (exact match required)
Resistance - Post Trip (R1): 3 Ohms maximum (exact match required)
Time to Trip: 2.5 s (exact match required)

Mechanical Compatibility Criteria:

Mounting Type: Through Hole
Package / Case: Radial, Disc
Lead Spacing: 0.201" (5.10mm) ±tolerance
Operating Temperature: -40°C ~ 85°C (minimum requirement)

Compliance Criteria:

RoHS3 Compliant
Approval Agencies: cURus and/or TUV certification

Substitute parts are grouped into two categories: direct parametric equivalents (identical electrical and mechanical specifications) and manufacturer-recommended alternatives (same voltage and current ratings with active product status).

Parameter Comparison

Part Number	Manufacturer	Voltage - Max	Current - Hold (Ih)	Current - Trip (It)	Resistance - Initial (Ri)	Resistance - Post Trip (R1)	Time to Trip	Product Status	Packaging
RLD60P025XFF	Littelfuse Inc.	60V	250 mA	500 mA	1.25 Ohms	3 Ohms	2.5 s	Obsolete	Radial, Disc
60R025XPR	Littelfuse Inc.	60V	250 mA	500 mA	1.25 Ohms	3 Ohms	2.5 s	Active	Cut Tape (CT)
RXEF025-AP	Littelfuse Inc.	72V	250 mA	500 mA	1.25 Ohms	3 Ohms	2.5 s	Active	Cut Tape (CT)
PFRA.025	SCHURTER Inc.	60V	250 mA	500 mA	1 Ohms	3 Ohms	2.5 s	Active	Bulk
PFRA.025.2	SCHURTER Inc.	60V	250 mA	500 mA	1 Ohms	3 Ohms	2.5 s	Active	Cut Tape (CT)

Engineering Selection Recommendations

Primary Substitute (Parametric Equivalent): The 60R025XPR from Littelfuse Inc. is the direct parametric equivalent to RLD60P025XFF. It maintains identical electrical specifications (60V, 250 mA hold current, 500 mA trip current, 1.25 Ohms initial resistance, 3 Ohms post-trip resistance, 2.5 s trip time) and mechanical form factor. The 60R025XPR carries active product status and is certified by cURus and TUV, ensuring long-term availability and compliance. Packaging is supplied in Cut Tape (CT) format.

Secondary Substitute (Higher Voltage Rating): The RXEF025-AP from Littelfuse Inc. provides identical electrical performance with an elevated maximum voltage rating of 72V. This part is suitable for applications where circuit voltage may exceed 60V. It maintains the same 250 mA hold current, 500 mA trip current, and 2.5 s trip time. The RXEF025-AP is active and certified by CQC, CSA, TUV, and UL.

Alternative Substitute (Different Manufacturer): PFRA.025 and PFRA.025.2 from SCHURTER Inc. provide functional equivalence with minor resistance variation. Initial resistance is specified at 1 Ohm (versus 1.25 Ohms for RLD60P025XFF), which may affect circuit behavior in applications with tight tolerance requirements. Both parts maintain 60V voltage rating, 250 mA hold current, 500 mA trip current, and 2.5 s trip time. Both are active products with cURus and TUV certification. PFRA.025 is supplied in Bulk packaging; PFRA.025.2 is supplied in Cut Tape (CT).

Compliance Status: All recommended substitutes are ROHS3 compliant and maintain the required operating temperature range of -40°C to 85°C.

Frequently Asked Questions (FAQ)

Q: Can RXEF025-AP be used as a direct replacement for RLD60P025XFF? A: Yes. RXEF025-AP is electrically and mechanically compatible. The higher 72V voltage rating provides additional margin in circuits operating below 60V. All electrical parameters (250 mA hold current, 500 mA trip current, 2.5 s trip time) are identical.

Q: What is the difference between 60R025XPR and PFRA.025? A: Both parts meet the 60V, 250 mA hold current specification. The primary difference is initial resistance: 60R025XPR specifies 1.25 Ohms minimum, while PFRA.025 specifies 1 Ohm minimum. In circuits where initial resistance affects performance, 60R025XPR provides closer parametric match to RLD60P025XFF. Packaging also differs: 60R025XPR is supplied in Cut Tape (CT); PFRA.025 is supplied in Bulk.

Q: Are PFRA.025 and PFRA.025.2 interchangeable? A: Yes. Both parts are electrically identical. The difference is packaging: PFRA.025 is supplied in Bulk; PFRA.025.2 is supplied in Cut Tape (CT). Select based on procurement and assembly requirements.

Q: Does the higher voltage rating of RXEF025-AP affect circuit operation? A: No. Higher voltage rating does not affect circuit operation in applications designed for 60V. The RXEF025-AP will function identically to RLD60P025XFF in 60V circuits and provides additional safety margin if circuit voltage may exceed 60V.

Q: What certifications apply to all recommended substitutes? A: All recommended substitutes carry TUV certification. 60R025XPR and PFRA series parts carry cURus certification. RXEF025-AP carries additional CQC, CSA, and UL certifications. All are ROHS3 compliant.

Q: Can these parts be used in applications requiring specific approval agencies? A: Verify approval agency requirements against each part's certification. If cURus and TUV are required, 60R025XPR, PFRA.025, and PFRA.025.2 meet this requirement. If broader certifications are needed, RXEF025-AP provides CQC, CSA, TUV, and UL approval.

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