RLD60P375XF Equivalent & Substitute Parts

Part Overview

The RLD60P375XF is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., part of the POLY-FUSE® RLD60 series. This component is rated for 60V maximum voltage with a 3.75A hold current and is designed for through-hole radial mounting in disc configuration. The product is currently obsolete, necessitating identification of equivalent alternatives that maintain electrical and mechanical compatibility for continued system support and new designs.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution eligibility for the RLD60P375XF is determined by strict alignment with the following critical parameters:

Voltage Rating: Maximum voltage must be equal to or greater than 60V
Current - Hold (Ih): Must match 3.75A specification
Current - Trip (It): Must match 7.5A specification
Resistance - Initial (Ri): Must meet minimum 30 mOhms
Resistance - Post Trip (R1): Must not exceed 80 mOhms maximum
Operating Temperature Range: Must encompass -40°C to 85°C
Mounting Type: Must be Through Hole
Package Configuration: Must be Radial, Disc
Lead Spacing: Must match 0.402" (10.20mm)
Approval Certifications: Must maintain cURus and TUV approvals

Two substitute parts meet these criteria: the 60R375XH from Littelfuse Inc. and the MF-RX375/72-0 from Bourns Inc.

Parameter Comparison

Parameter	RLD60P375XF	60R375XH	MF-RX375/72-0
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Bourns Inc.
Series	POLY-FUSE® RLD60	POLY-FUSE® 60R	Multifuse® MF-RX/72
Product Status	Obsolete	Active	Active
Voltage - Max	60V	60V	72V
Current - Hold (Ih) (Max)	3.75 A	3.75 A	3.75 A
Current - Trip (It)	7.5 A	7.5 A	7.5 A
Current - Max	40 A	40 A	40 A
Time to Trip	24 s	24 s	24 s
Resistance - Initial (Ri) (Min)	30 mOhms	30 mOhms	30 mOhms
Resistance - Post Trip (R1) (Max)	80 mOhms	80 mOhms	80 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc
Lead Spacing	0.402" (10.20mm)	0.402" (10.20mm)	0.402" (10.20mm)
Approval Agency	cURus, TUV	cURus, TUV	cURus, TUV
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	Not Applicable	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Both substitute parts satisfy the electrical and mechanical requirements for direct replacement of the RLD60P375XF. Selection between them should be based on the following factors:

60R375XH (Littelfuse Inc.): This part maintains manufacturer continuity within the Littelfuse POLY-FUSE® product family and is rated at the same 60V maximum voltage as the original component. The part is currently in active production status with 1157 units in stock. It carries ROHS3 compliance and MSL rating of 1 (Unlimited), representing improved environmental and handling characteristics compared to the obsolete original.

MF-RX375/72-0 (Bourns Inc.): This Multifuse® alternative provides a higher voltage rating of 72V, offering additional design margin in applications where voltage transients or future system upgrades may occur. The part is actively produced with 6502 units in stock. It also meets ROHS3 compliance and carries MSL rating of 1 (Unlimited). The higher voltage rating makes this option suitable for systems requiring enhanced overvoltage protection.

Both parts maintain identical electrical performance characteristics (hold current, trip current, resistance values, and response time) and are certified by the same approval agencies (cURus, TUV).

Frequently Asked Questions (FAQ)

Q: Can the 60R375XH be used as a direct replacement for the RLD60P375XF?

A: Yes. The 60R375XH matches all critical electrical parameters (60V voltage rating, 3.75A hold current, 7.5A trip current, 30 mOhms initial resistance, 80 mOhms post-trip resistance) and maintains identical mechanical specifications (through-hole radial disc package, 0.402" lead spacing). Both parts carry cURus and TUV certifications.

Q: What is the advantage of using the MF-RX375/72-0 over the 60R375XH?

A: The MF-RX375/72-0 provides a 72V maximum voltage rating compared to the 60V rating of both the original RLD60P375XF and the 60R375XH substitute. This higher voltage rating offers additional protection margin in applications subject to voltage transients or in systems designed for future voltage upgrades. All other electrical characteristics remain identical.

Q: Are there physical differences between these parts that affect PCB layout?

A: The parts have minor dimensional variations in overall diameter and height. The RLD60P375XF measures 1.118" diameter with 1.319" seated height. The 60R375XH measures 1.035" diameter with 1.224" seated height. The MF-RX375/72-0 measures 0.926" length with 1.161" seated height. All three maintain the same 0.402" lead spacing. These dimensional differences may require PCB layout verification for tight mechanical clearances.

Q: Do the substitute parts have improved compliance ratings?

A: Yes. Both substitute parts are ROHS3 compliant, whereas the original RLD60P375XF is RoHS non-compliant. Both substitutes carry MSL rating of 1 (Unlimited), indicating superior moisture handling characteristics compared to the original part's "Not Applicable" rating.

Q: Which substitute should be selected for new designs?

A: Selection depends on system voltage requirements. For systems operating at or below 60V, either part is suitable. The 60R375XH maintains manufacturer continuity with Littelfuse. For systems requiring enhanced overvoltage margin or those designed for potential voltage upgrades, the MF-RX375/72-0 is the appropriate choice.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message