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MF-RX375-AP Equivalent & Substitute Parts
Part Overview
The MF-RX375-AP is a polymeric PTC resettable fuse manufactured by Bourns Inc., part of the Multifuse® MF-RX series. This through-hole radial disc component is rated for 60V maximum voltage with a 3.75A hold current and 7.5A trip current. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing system support, maintenance, and component procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Bourns Inc. |
| Series | Multifuse®, MF-RX |
| Type | Polymeric PTC Resettable Fuse |
| Voltage - Max | 60V |
| Current - Hold (Ih) | 3.75A |
| Current - Trip (It) | 7.5A |
| Current - Max | 40A |
| Time to Trip | 24s |
| Resistance - Initial (Ri) | 30 mOhms (Min) |
| Resistance - Post Trip (R1) | 80 mOhms (Max) |
| Operating Temperature Range | -40°C to 85°C |
| Mounting Type | Through Hole |
| Package / Case | Radial, Disc |
| Lead Spacing | 0.402" (10.20mm) |
| Approval Agencies | cURus, TUV |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the MF-RX375-AP is determined by the following critical parameters:
Mandatory Matching Parameters:
- Polymeric PTC resettable fuse type
- Current hold rating: 3.75A
- Current trip rating: 7.5A
- Through-hole radial mounting configuration
- Lead spacing: 0.402" (10.20mm)
- Operating temperature range: -40°C to 85°C
- Approval agencies: cURus and TUV certification
Allowable Variation Parameters:
- Voltage rating: May exceed 60V (higher voltage rating maintains backward compatibility in lower-voltage applications)
- Physical dimensions: Minor variations acceptable if mounting footprint and lead spacing remain constant
- Resistance characteristics: Initial and post-trip resistance within specified ranges
The MF-RX375/72-AP qualifies as a direct substitute based on matching all mandatory parameters while providing an elevated voltage rating of 72V, which is suitable for applications originally designed for 60V operation.
Parameter Comparison
| Parameter | MF-RX375-AP (Main Part) | MF-RX375/72-AP (Substitute) |
|---|---|---|
| Manufacturer | Bourns Inc. | Bourns Inc. |
| Series | Multifuse®, MF-RX | Multifuse®, MF-RX/72 |
| Type | Polymeric PTC Resettable Fuse | Polymeric PTC Resettable Fuse |
| Voltage - Max | 60V | 72V |
| Current - Hold (Ih) | 3.75A | 3.75A |
| Current - Trip (It) | 7.5A | 7.5A |
| Current - Max | 40A | 40A |
| Time to Trip | 24s | 24s |
| Resistance - Initial (Ri) | 30 mOhms (Min) | 30 mOhms (Min) |
| Resistance - Post Trip (R1) | 80 mOhms (Max) | 80 mOhms (Max) |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C |
| Mounting Type | Through Hole | Through Hole |
| Package / Case | Radial, Disc | Radial, Disc |
| Lead Spacing | 0.402" (10.20mm) | 0.402" (10.20mm) |
| Approval Agencies | cURus, TUV | cURus, TUV |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Obsolete | Active |
Engineering Selection Recommendations
The MF-RX375/72-AP is the qualified substitute for the obsolete MF-RX375-AP. Selection is based on the following engineering criteria:
Functional Equivalence: Both components maintain identical current hold (3.75A), trip (7.5A), and response time (24s) characteristics, ensuring equivalent circuit protection behavior.
Voltage Compatibility: The substitute's 72V rating exceeds the original 60V specification, providing enhanced voltage margin without compromising performance in 60V-rated applications.
Certification Alignment: Both parts carry cURus and TUV approvals and maintain ROHS3 compliance, satisfying regulatory and safety requirements.
Availability Status: The substitute is currently active in production, ensuring reliable procurement compared to the obsolete original part.
Mechanical Compatibility: Identical lead spacing (0.402"), mounting type (through-hole radial), and operating temperature range (-40°C to 85°C) guarantee direct PCB footprint compatibility.
Frequently Asked Questions (FAQ)
Q: Can the MF-RX375/72-AP be used as a direct replacement for the MF-RX375-AP?
A: Yes. The substitute maintains identical current hold, trip, and thermal characteristics while providing a higher voltage rating. The 72V rating is backward-compatible with 60V applications.
Q: What is the significance of the voltage rating difference?
A: The MF-RX375/72-AP's 72V maximum rating provides additional voltage headroom. In a 60V circuit, this creates a safety margin without altering the fuse's protective response characteristics.
Q: Are the physical dimensions compatible with existing PCB layouts?
A: Yes. Both components share identical lead spacing (0.402" / 10.20mm) and through-hole radial mounting configuration. Minor differences in disc diameter and height do not affect PCB footprint compatibility.
Q: Do both parts meet the same regulatory standards?
A: Yes. Both the MF-RX375-AP and MF-RX375/72-AP carry cURus and TUV certifications and are ROHS3 compliant.
Q: What is the packaging difference between these parts?
A: The original MF-RX375-AP is obsolete with no current packaging specification. The MF-RX375/72-AP is supplied in Tape & Box (TB) packaging for active production.
Q: Are the electrical characteristics identical?
A: Yes. Both components have identical initial resistance (30 mOhms minimum), post-trip resistance (80 mOhms maximum), and time-to-trip (24 seconds).
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