RLD60P135XF Equivalent & Substitute Parts

Part Overview

The RLD60P135XF is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 60V maximum voltage with 1.35A hold current. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The part operates across a temperature range of -40°C to 85°C and provides automatic circuit protection through thermal response characteristics inherent to polymeric PTC technology.

Substiute Parts

RLD60P135XF

Littelfuse Inc.In Stock: 923RLD60P135XF Datasheet

Current PartRFQ

60R135XMR

LittelfuseIn Stock: 220860R135XMR Datasheet

DirectRFQ

RXEF135-AP

Littelfuse Inc.In Stock: 2047RXEF135-AP Datasheet

DirectRFQ

60R135XF

Littelfuse Inc.In Stock: 84860R135XF Datasheet

MFR RecommendedRFQ

MF-RX135/72-0

Bourns Inc.In Stock: 21990MF-RX135/72-0 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RLD60P135XF is determined by the following critical parameters:

• Voltage Rating: Maximum voltage must equal or exceed 60V
• Current - Hold (Ih): Must match 1.35 A specification
• Current - Trip (It): Must match 2.7 A specification
• Mounting Type: Must be Through Hole
• Package / Case: Must be Radial, Disc configuration
• Lead Spacing: Must accommodate 0.201" (5.10mm) spacing
• Operating Temperature Range: Must support -40°C to 85°C

Three substitute parts meet these criteria with variations in voltage rating, physical dimensions, and product status:

60R135XMR (Littelfuse) - Direct electrical equivalent with identical 60V rating and active product status 60R135XF (Littelfuse) - Manufacturer-recommended substitute with identical 60V rating and active product status RXEF135-AP (Littelfuse) - Higher voltage rated option at 72V with active product status MF-RX135/72-0 (Bourns Inc.) - Cross-manufacturer alternative with 72V rating and active product status

Parameter Comparison

Engineering Selection Recommendations

60R135XMR is the direct equivalent substitute for RLD60P135XF. Both components share identical electrical specifications at 60V, 1.35A hold current, and matching thermal response characteristics. The 60R135XMR is active in production with ROHS3 compliance and improved availability (2181 pcs in stock versus 862 pcs for the original part). This part is packaged in Cut Tape format.

60R135XF is the manufacturer-recommended alternative, also from Littelfuse with identical 60V electrical ratings. This variant offers active product status and ROHS3 compliance. It is supplied in Bulk packaging with 806 pcs available in stock.

RXEF135-AP provides a higher voltage rating of 72V while maintaining all other electrical parameters. This part is suitable for applications where voltage headroom is beneficial. It carries expanded certifications including CQC, CSA, TUV, and UL approvals. Physical dimensions differ slightly (0.571" Dia x 0.118" T versus 0.122" T for the original).

MF-RX135/72-0 is a cross-manufacturer option from Bourns Inc. with 72V voltage rating. This part maintains all electrical specifications and offers the highest inventory availability (21965 pcs in stock). Physical dimensions are compact at 0.483" L x 0.122" W. All substitute parts maintain the required 0.201" lead spacing tolerance for PCB compatibility.

Frequently Asked Questions (FAQ)

Q: Can 60R135XMR directly replace RLD60P135XF in existing designs? A: Yes. The 60R135XMR matches all critical electrical parameters: 60V maximum voltage, 1.35A hold current, 2.7A trip current, and 9.6s trip time. Lead spacing of 0.201" (5.10mm) is identical. The primary difference is product status (active versus obsolete) and packaging format (Cut Tape versus radial disc).

Q: What is the difference between 60R135XF and 60R135XMR? A: Both are Littelfuse POLY-FUSE series components with identical electrical specifications. The primary distinction is packaging: 60R135XF is supplied in Bulk format while 60R135XMR is in Cut Tape. Physical dimensions vary slightly (0.535" Dia for both, but different height specifications). Both are ROHS3 compliant and active products.

Q: Can I use RXEF135-AP or MF-RX135/72-0 as substitutes if my circuit operates at 60V? A: Yes. Both parts are rated for 72V maximum voltage, which exceeds the 60V requirement. All other electrical parameters match: 1.35A hold current, 2.7A trip current, 9.6s trip time, and identical resistance specifications. The higher voltage rating provides additional safety margin without affecting circuit operation at 60V.

Q: Are there physical dimension constraints I should consider? A: Lead spacing is critical for PCB compatibility. All substitutes maintain 0.201" (5.10mm) spacing except RXEF135-AP at 0.200" (5.08mm), which is within tolerance. Disc diameter and height vary slightly between parts. Verify PCB footprint clearance before substitution, particularly for RXEF135-AP and MF-RX135/72-0 which have different physical profiles.

Q: What are the RoHS compliance implications? A: The original RLD60P135XF is RoHS non-compliant. All substitute parts (60R135XMR, 60R135XF, RXEF135-AP, and MF-RX135/72-0) are ROHS3 compliant, meeting current environmental regulations for new production and design transitions.

Q: Which substitute offers the best availability? A: MF-RX135/72-0 from Bourns Inc. has the highest inventory at 21965 pcs in stock. If Littelfuse parts are preferred, 60R135XMR offers 2181 pcs availability. The original RLD60P135XF has 862 pcs remaining.

Q: Are there certification differences between substitutes? A: RXEF135-AP carries the broadest certification scope (CQC, CSA, TUV, UL) compared to other Littelfuse options (cURus, TUV). MF-RX135/72-0 maintains cURus and TUV certifications. All parts meet industry safety standards for polymeric PTC resettable fuse applications.