MF-RX250 Polymeric PTC Resettable Fuse – Equivalent & Substitute Parts

Part Overview

The Bourns MF-RX250 is a polymeric PTC resettable fuse rated for 60V at 2.5A hold current, designed for through-hole radial mounting in disc configuration. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design support and procurement. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer compatible performance within defined parameter tolerances for applications requiring 60V operation at 2.5A hold current ratings.

Key Parameters

Parameter	Value
Voltage - Max	60V
Current - Hold (Ih) (Max)	2.5 A
Current - Trip (It)	5 A
Current - Max	40 A
Time to Trip	15.6 s
Resistance - Initial (Ri) (Min)	50 mOhms
Resistance - Post Trip (R1) (Max)	130 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
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the MF-RX250 is determined by the following critical parameters:

Primary Electrical Criteria:

Voltage - Max: 60V (minimum requirement; higher voltage ratings are acceptable)
Current - Hold (Ih) (Max): 2.5 A (exact match required)
Current - Trip (It): 5 A (exact match required)
Resistance - Initial (Ri) (Min): 50 mOhms (exact match required)
Resistance - Post Trip (R1) (Max): 130 mOhms (exact match required)
Time to Trip: 15.6 s (exact match required)

Mechanical Criteria:

Mounting Type: Through Hole (required)
Package / Case: Radial, Disc (required)
Lead Spacing: 0.402" (10.20mm) ± tolerance (required for PCB compatibility)

Compliance Criteria:

Approval Agency: cURus, TUV (required)
RoHS Status: ROHS3 Compliant (required)

Parts meeting all primary electrical criteria, mechanical configuration, and compliance requirements are classified as direct substitutes. Parts with voltage ratings exceeding 60V but matching all other parameters are acceptable for applications where higher voltage margin is beneficial.

Parameter Comparison

Parameter	MF-RX250 (Main)	MF-RX250-005	MF-RX250/72-0	0ZRC0250FF1A	60R250XF	60R250XMR	PTR060V0250-TR
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.	Bel Fuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Eaton - Electronics Division
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Voltage - Max	60V	60V	72V	90V	60V	60V	60V
Current - Hold (Ih) (Max)	2.5 A	2.5 A	2.5 A	2.5 A	2.5 A	2.5 A	2.5 A
Current - Trip (It)	5 A	5 A	5 A	5 A	5 A	5 A	5 A
Current - Max	40 A	40 A	40 A	40 A	40 A	40 A	40 A
Time to Trip	15.6 s	15.6 s	15.6 s	15.6 s	15.6 s	15.6 s	15.6 s
Resistance - Initial (Ri) (Min)	50 mOhms	50 mOhms	50 mOhms	50 mOhms	50 mOhms	50 mOhms	50 mOhms
Resistance - Post Trip (R1) (Max)	130 mOhms	130 mOhms	130 mOhms	130 mOhms	130 mOhms	130 mOhms	130 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc
Lead Spacing	0.402" (10.20mm)	0.402" (10.20mm)	0.402" (10.20mm)	0.402" (10.20mm)	0.402" (10.20mm)	0.402" (10.20mm)	0.394" (10.00mm)
Approval Agency	cURus, TUV	cURus, TUV	cURus, TUV	cURus, TUV	cURus, TUV	cURus, TUV	cURus, TUV
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	-	-	Bulk	Box	Bulk	Cut Tape (CT)	Tape & Reel (TR)
Inventory Status	1081 Pcs	1102 Pcs	4076 Pcs	18344 Pcs	1730 Pcs	2374 Pcs	664 Pcs

Engineering Selection Recommendations

Bourns MF-RX250-005 is the primary parametric equivalent, offering identical electrical and mechanical specifications with active product status. This part is sourced from the same manufacturer as the obsolete MF-RX250 and maintains full compatibility with existing designs.

Bourns MF-RX250/72-0 provides equivalent electrical performance with elevated voltage rating (72V vs. 60V), suitable for applications where increased voltage margin is required. Active status and identical mechanical configuration ensure direct PCB compatibility.

Littelfuse 60R250XF and 60R250XMR are direct electrical and mechanical equivalents from an established PTC fuse manufacturer. Both parts maintain 60V rating, 2.5A hold current, and identical trip characteristics. The 60R250XF is available in bulk packaging, while 60R250XMR is supplied in cut tape format for automated assembly.

Bel Fuse 0ZRC0250FF1A meets all electrical specifications with 90V voltage rating and includes AEC-Q200 automotive qualification. This part is suitable for applications requiring enhanced voltage margin and automotive-grade reliability.

Eaton PTR060V0250-TR provides electrical equivalence with tape and reel packaging for high-volume production. Lead spacing of 0.394" (10.00mm) differs marginally from the 0.402" (10.20mm) standard; PCB layout verification is required prior to implementation.

All substitute parts carry cURus and TUV approvals with ROHS3 compliance, meeting regulatory requirements for the MF-RX250 application space.

Frequently Asked Questions (FAQ)

Q: Can MF-RX250-005 be used as a direct replacement for the obsolete MF-RX250?

A: Yes. The MF-RX250-005 is a parametric equivalent with identical voltage (60V), hold current (2.5A), trip current (5A), resistance characteristics, and mechanical configuration. Active product status ensures ongoing availability.

Q: What is the difference between the 60V and 72V rated Bourns parts?

A: The MF-RX250/72-0 operates at 72V maximum versus 60V for the MF-RX250-005. Both maintain identical hold current (2.5A), trip current (5A), and resistance specifications. The 72V part provides additional voltage margin for applications operating near the 60V limit.

Q: Are Littelfuse 60R250XF and 60R250XMR interchangeable?

A: Yes. Both parts are electrically and mechanically identical, differing only in packaging format. The 60R250XF is supplied in bulk, while 60R250XMR is provided in cut tape for automated pick-and-place assembly.

Q: Does the Eaton PTR060V0250-TR require PCB layout changes?

A: The Eaton part has lead spacing of 0.394" (10.00mm) compared to the standard 0.402" (10.20mm). PCB hole pattern verification is necessary before implementation to confirm compatibility with existing through-hole spacing.

Q: Which substitute part offers the highest voltage rating?

A: The Bel Fuse 0ZRC0250FF1A is rated for 90V maximum, providing the greatest voltage margin. This part also carries AEC-Q200 automotive qualification for applications requiring enhanced reliability standards.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts meet ROHS3 compliance requirements and carry cURus and TUV approvals, maintaining regulatory alignment with the original MF-RX250 specification.

Q: What packaging options are available for high-volume production?

A: Littelfuse 60R250XMR is supplied in cut tape format, and Eaton PTR060V0250-TR is available in tape and reel packaging, both suitable for automated assembly processes. Bel Fuse 0ZRC0250FF1A is supplied in box packaging.

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