RLD60P375XFF Equivalent & Substitute Parts

Part Overview

The RLD60P375XFF is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., part of the POLY-FUSE® RLD60 series. This component is designed for overcurrent protection in electronic circuits with a maximum voltage rating of 60V and a hold current of 3.75A. The part is currently listed as obsolete, making identification of suitable substitute components essential for ongoing maintenance, repair, and legacy system support.

Substiute Parts

RLD60P375XFF

Littelfuse Inc.In Stock: 1040RLD60P375XFF Datasheet

Current PartRFQ

60R375XH

Littelfuse Inc.In Stock: 123160R375XH Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The RLD60P375XFF has one direct substitute: the 60R375XH, also manufactured by Littelfuse Inc. This substitution is valid based on the following critical parameters that must remain constant for functional equivalence:

• Voltage - Max: 60V (identical)
• Current - Hold (Ih) (Max): 3.75 A (identical)
• Current - Trip (It): 7.5 A (identical)
• Current - Max: 40 A (identical)
• Time to Trip: 24 s (identical)
• Resistance - Initial (Ri) (Min): 30 mOhms (identical)
• Resistance - Post Trip (R1) (Max): 80 mOhms (identical)
• Operating Temperature: -40°C ~ 85°C (identical)
• Mounting Type: Through Hole (identical)
• Package / Case: Radial, Disc (identical)
• Lead Spacing: 0.402" (10.20mm) (identical)
• Approval Agency: cURus, TUV (identical)
• RoHS Status: ROHS3 Compliant (identical)

The 60R375XH maintains all electrical and mechanical specifications required for direct substitution in circuits designed for the RLD60P375XFF.

Parameter Comparison

Engineering Selection Recommendations

The 60R375XH is the appropriate substitute for the obsolete RLD60P375XFF. The substitute part maintains identical electrical performance characteristics and mechanical compatibility. The 60R375XH carries active product status, ensuring ongoing availability and supply chain continuity. Both components meet cURus and TUV approval requirements and comply with ROHS3 standards, satisfying regulatory and environmental compliance requirements for equivalent applications.

Frequently Asked Questions (FAQ)

Q: Can the 60R375XH be used as a direct replacement for the RLD60P375XFF?

A: Yes. The 60R375XH is electrically and mechanically equivalent to the RLD60P375XFF. All critical parameters including voltage rating, hold current, trip current, resistance values, and operating temperature range are identical. The through-hole radial mounting configuration and lead spacing are unchanged.

Q: What is the primary difference between these two parts?

A: The RLD60P375XFF is obsolete, while the 60R375XH is an active product. Both belong to Littelfuse's POLY-FUSE® resettable fuse family but represent different series designations (RLD60 versus 60R). The physical dimensions show minor variations: the RLD60P375XFF has a diameter of 1.118" (28.40mm) and seated height of 1.319" (34.60mm), while the 60R375XH has a diameter of 1.035" (26.30mm) and seated height of 1.224" (31.10mm).

Q: Are there any compliance or certification differences?

A: Both parts carry identical approval certifications (cURus, TUV) and comply with ROHS3 standards. The 60R375XH includes REACH Unaffected status and specifies Moisture Sensitivity Level 1 (Unlimited), while the RLD60P375XFF lists MSL as Not Applicable.

Q: Will the physical size difference affect circuit board layout?

A: The lead spacing remains constant at 0.402" (10.20mm) for both parts, ensuring compatibility with existing PCB footprints. However, the smaller overall diameter and height of the 60R375XH may provide layout advantages in space-constrained applications.

Q: What inventory considerations should be noted?

A: The RLD60P375XFF is listed as obsolete with 936 pieces in stock. The 60R375XH is an active product with 1,157 pieces available, providing better long-term supply assurance for new designs and ongoing production requirements.