Equivalent & Substitute Parts for MF-RX375

Part Overview

The Bourns MF-RX375 is a polymeric PTC resettable fuse rated for 60V at 3.75A hold current, designed for through-hole radial mounting in disc configuration. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MF-RX375 series provides automatic overcurrent protection with a 24-second trip time and operates across the -40°C to 85°C temperature range. Substitute parts must maintain electrical performance characteristics while accommodating available inventory and active product status where applicable.

Key Parameters

Parameter	Value	Unit
Voltage - Max	60	V
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 to 85	°C
Mounting Type	Through Hole	—
Package / Case	Radial, Disc	—
Lead Spacing	0.402	inches (10.20 mm)
Type	Polymeric	—

Substitute Part Grouping Explanation

Substitution eligibility for the MF-RX375 is determined by the following electrical and mechanical parameters:

Primary Substitution Criteria:

Current - Hold (Ih) (Max): 3.75 A
Current - Trip (It): 7.5 A
Time to Trip: 24 s
Resistance - Initial (Ri) (Min): 30 mOhms
Resistance - Post Trip (R1) (Max): 80 mOhms
Operating Temperature: -40°C to 85°C
Mounting Type: Through Hole
Package / Case: Radial, Disc
Lead Spacing: 0.402 inches (10.20 mm)

Voltage Tolerance: Substitute parts may operate at voltage ratings equal to or greater than 60V, provided all other electrical characteristics remain identical. This allows for higher voltage-rated components in applications where the circuit voltage does not exceed the original specification.

Identified Substitute Categories:

Direct Manufacturer Equivalent (Bourns MF-RX375-005): Identical electrical and mechanical specifications with active product status.
Voltage-Elevated Equivalent (Bourns MF-RX375/72-0): 72V rating with identical current and thermal characteristics; shorter physical dimensions due to voltage derating.
Cross-Manufacturer Equivalents: Bel Fuse 0ZRC0375FF1A (90V) and Littelfuse 60R375XH (60V) provide parametric equivalence with identical hold current, trip current, and thermal performance.

Parameter Comparison

Parameter	MF-RX375	MF-RX375-005	MF-RX375/72-0	0ZRC0375FF1A	60R375XH
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.	Bel Fuse Inc.	Littelfuse Inc.
Voltage - Max	60V	60V	72V	90V	60V
Current - Hold (Ih) (Max)	3.75A	3.75A	3.75A	3.75A	3.75A
Current - Trip (It)	7.5A	7.5A	7.5A	7.5A	7.5A
Current - Max	40A	40A	40A	40A	40A
Time to Trip	24s	24s	24s	24s	24s
Resistance - Initial (Ri) (Min)	30 mOhms	30 mOhms	30 mOhms	30 mOhms	30 mOhms
Resistance - Post Trip (R1) (Max)	80 mOhms	80 mOhms	80 mOhms	80 mOhms	80 mOhms
Operating Temperature	-40 to 85°C	-40 to 85°C	-40 to 85°C	-40 to 85°C	-40 to 85°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	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)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	cURus, TUV	cURus, TUV	cURus, TUV	cURus, TUV	cURus, TUV

Engineering Selection Recommendations

MF-RX375-005 (Bourns Inc.): This part is the primary substitute for the obsolete MF-RX375. It maintains identical electrical specifications, physical dimensions, and thermal characteristics while offering active product status. All compliance certifications (cURus, TUV, ROHS3) are maintained. This part is recommended for direct replacement in existing designs.

MF-RX375/72-0 (Bourns Inc.): This variant provides a 72V maximum voltage rating with identical current and thermal performance. Physical dimensions are reduced due to voltage derating. This part is suitable for applications where circuit voltage does not exceed 60V and where the smaller form factor is acceptable. Active product status and full compliance certifications are maintained.

0ZRC0375FF1A (Bel Fuse Inc.): This cross-manufacturer equivalent provides a 90V maximum voltage rating with identical electrical characteristics. It carries AEC-Q200 automotive qualification in addition to cURus and TUV certifications. This part is suitable for applications requiring automotive-grade reliability or higher voltage margin. Physical dimensions are comparable to the original MF-RX375.

60R375XH (Littelfuse Inc.): This cross-manufacturer equivalent maintains the 60V voltage rating with identical electrical specifications. Physical dimensions vary slightly (1.035" diameter versus 1.118" length for the original). This part is suitable for applications where Littelfuse component qualification is required. Active product status and full compliance certifications are maintained.

Frequently Asked Questions (FAQ)

Q: Can MF-RX375-005 be used as a direct replacement for MF-RX375?

A: Yes. The MF-RX375-005 maintains identical electrical specifications (60V, 3.75A hold current, 7.5A trip current, 24-second trip time), physical dimensions, lead spacing, and thermal operating range. All compliance certifications are equivalent. This is the recommended substitute for the obsolete MF-RX375.

Q: What is the difference between MF-RX375 and MF-RX375/72-0?

A: The MF-RX375/72-0 is rated for 72V maximum voltage compared to 60V for the MF-RX375. All other electrical parameters (hold current, trip current, trip time, resistance values, and operating temperature) are identical. The 72V variant has reduced physical dimensions (0.926" length versus 1.118" length) due to voltage derating. Both parts maintain identical lead spacing (0.402 inches).

Q: Can I use the 0ZRC0375FF1A in place of MF-RX375?

A: Yes, provided your circuit voltage does not exceed 60V. The 0ZRC0375FF1A is rated for 90V maximum and maintains identical hold current (3.75A), trip current (7.5A), trip time (24 seconds), and resistance characteristics. Physical dimensions are comparable. This part includes AEC-Q200 automotive qualification, making it suitable for automotive applications.

Q: Are there physical dimension differences between these substitute parts?

A: Yes. The MF-RX375 measures 1.118" L x 0.122" W with 1.319" seated height. The MF-RX375/72-0 measures 0.926" L x 0.122" W with 1.161" seated height. The 0ZRC0375FF1A measures 1.122" L x 0.122" W with 1.319" seated height. The 60R375XH measures 1.035" diameter x 0.122" thickness with 1.224" seated height. All parts maintain the same 0.402-inch lead spacing for PCB compatibility.

Q: Do all substitute parts have the same compliance certifications?

A: All substitute parts carry cURus and TUV approvals and are ROHS3 compliant. The 0ZRC0375FF1A additionally carries AEC-Q200 automotive qualification. The original MF-RX375 and MF-RX375-005 specify Moisture Sensitivity Level 1 (Unlimited), while the 0ZRC0375FF1A lists MSL as Not Applicable.

Q: Which substitute should I select for a new design?

A: For new designs requiring 60V operation, select either MF-RX375-005 (Bourns) or 60R375XH (Littelfuse) based on your preferred manufacturer qualification. For applications requiring higher voltage margin, select MF-RX375/72-0 (72V) or 0ZRC0375FF1A (90V). For automotive applications, 0ZRC0375FF1A is the appropriate choice due to AEC-Q200 qualification.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message