MF-RX375-2-99 Equivalent & Substitute Parts

Part Overview

The MF-RX375-2-99 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc. in the Multifuse® MF-RX 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 part is currently listed as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement.

Substiute Parts

MF-RX375-2-99

Bourns Inc.In Stock: 885MF-RX375-2-99 Datasheet

Current PartRFQ

MF-RX375/72-2

Bourns Inc.In Stock: 3698MF-RX375/72-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for PTC resettable fuses is determined by the following critical parameters:

• Voltage rating (must equal or exceed circuit voltage requirements)
• Current hold rating (Ih) and trip current (It) characteristics
• Resistance specifications (initial and post-trip)
• Mounting type and lead spacing (physical compatibility)
• Thermal operating range
• Regulatory certifications and compliance status

The MF-RX375/72-2 qualifies as a direct substitute based on matching hold current (3.75A), trip current (7.5A), resistance characteristics, operating temperature range, lead spacing (0.402"), mounting type (through-hole radial), and regulatory approvals. The primary difference is the elevated maximum voltage rating (72V vs. 60V), which provides enhanced circuit protection capability without compromising performance in 60V applications.

Parameter Comparison

Engineering Selection Recommendations

The MF-RX375/72-2 is the active production substitute for the obsolete MF-RX375-2-99. Both components maintain identical electrical performance characteristics across current hold, trip, and resistance parameters. The substitute carries active product status with established supply availability (3651 pcs in stock vs. 786 pcs for the obsolete part), ensuring long-term procurement reliability.

Both parts carry equivalent regulatory certifications (cURus, TUV) and maintain ROHS3 compliance and REACH unaffected status. The elevated voltage rating of the substitute (72V) provides additional design margin in applications operating at or below 60V without introducing functional incompatibility.

Physical compatibility is maintained through identical lead spacing (0.402"), mounting type (through-hole radial), and disc package configuration. The substitute exhibits slightly reduced physical dimensions (24.61mm L vs. 28.40mm L), which may provide layout advantages in space-constrained applications.

Frequently Asked Questions (FAQ)

Q: Can MF-RX375/72-2 be used as a direct replacement for MF-RX375-2-99?

A: Yes. The substitute maintains identical hold current (3.75A), trip current (7.5A), resistance characteristics, operating temperature range, and lead spacing. The higher voltage rating (72V) does not compromise functionality in 60V circuits.

Q: What is the primary reason for substitution?

A: The MF-RX375-2-99 is obsolete. The MF-RX375/72-2 is an active production part with established supply chain availability.

Q: Are there physical compatibility concerns?

A: No. Both components use identical lead spacing (0.402") and through-hole radial mounting. The substitute is slightly more compact (24.61mm vs. 28.40mm length), which may improve PCB layout efficiency.

Q: Do regulatory certifications differ between the parts?

A: No. Both components carry cURus and TUV approvals, ROHS3 compliance, and REACH unaffected status.

Q: What is the packaging difference?

A: The main part is supplied in standard packaging. The substitute is available in Cut Tape (CT) format, which may affect procurement and handling procedures.

Q: Are the electrical performance characteristics identical?

A: Yes. Current hold, trip current, resistance specifications, time to trip, and operating temperature range are identical across both components.