MF-RX375-2 Equivalent & Substitute Parts

Part Overview

The Bourns MF-RX375-2 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 identification of compatible alternatives essential for ongoing system support and procurement planning. The MF-RX series provides automatic overcurrent protection with self-resetting capability across industrial and consumer applications.

Substiute Parts

MF-RX375-2

Bourns Inc.In Stock: 1035MF-RX375-2 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 the MF-RX375-2 is determined by the following critical parameters:

• Voltage Rating: The substitute must support the application voltage requirement. The MF-RX375-2 operates at 60V maximum; substitutes rated at higher voltages (72V) are acceptable for 60V applications.
• Current - Hold (Ih): Must match at 3.75A to maintain identical protection thresholds.
• Current - Trip (It): Must match at 7.5A to ensure consistent overcurrent response.
• Mounting Type & Package: Must be through-hole radial disc configuration to ensure PCB compatibility.
• Lead Spacing: Must match 0.402" (10.20mm) for direct board-level substitution.
• Resistance Characteristics: Initial resistance (Ri) and post-trip resistance (R1) must remain within specified ranges.
• Operating Temperature Range: Must support -40°C to 85°C minimum.

The MF-RX375/72-2 qualifies as a direct substitute based on matching all critical electrical and mechanical parameters, with the exception of voltage rating, which is higher and therefore compatible with 60V applications.

Parameter Comparison

Engineering Selection Recommendations

The MF-RX375/72-2 is the qualified substitute for the obsolete MF-RX375-2. Selection is based on the following factors:

• Electrical Compatibility: All critical electrical parameters match exactly, including hold current, trip current, resistance characteristics, and response time.
• Mechanical Compatibility: Identical through-hole radial disc package with matching 0.402" lead spacing ensures direct PCB substitution without layout modification.
• Regulatory Compliance: Both components carry cURus and TUV certifications and maintain ROHS3 and REACH compliance status.
• Product Availability: The substitute is classified as active product with confirmed inventory (3651 pcs), ensuring long-term procurement viability compared to the obsolete original.
• Voltage Derating: The 72V rating of the substitute provides additional voltage margin for 60V applications, enhancing system reliability without compromising protection characteristics.

Frequently Asked Questions (FAQ)

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

A: Yes. The MF-RX375/72-2 is a direct substitute. All electrical parameters (hold current, trip current, resistance, response time) and mechanical specifications (package, lead spacing, mounting type) are identical. The higher voltage rating (72V vs. 60V) is compatible with 60V applications.

Q: What is the difference between the MF-RX375-2 and MF-RX375/72-2?

A: The primary difference is the maximum voltage rating: MF-RX375-2 is rated for 60V, while MF-RX375/72-2 is rated for 72V. All other electrical and mechanical parameters are identical. The substitute provides additional voltage margin.

Q: Are there any PCB layout changes required when substituting the MF-RX375/72-2 for the MF-RX375-2?

A: No. Both components use identical through-hole radial disc packages with 0.402" (10.20mm) lead spacing. Direct board-level substitution is possible without layout modification.

Q: What certifications apply to the substitute part?

A: The MF-RX375/72-2 carries cURus and TUV approvals, matching the original MF-RX375-2. Both components are ROHS3 compliant and REACH unaffected.

Q: Why is the original MF-RX375-2 listed as obsolete?

A: Product obsolescence is determined by the manufacturer. The MF-RX375/72-2 remains in active production and serves the same functional requirements, making it the appropriate long-term alternative for new designs and ongoing system support.

Q: Are the resistance characteristics identical between the two parts?

A: Yes. Both components specify 30 mOhms minimum initial resistance (Ri) and 80 mOhms maximum post-trip resistance (R1), ensuring identical electrical behavior during normal operation and fault conditions.