PFRA.050.3 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The PFRA.050.3 is a polymeric PTC resettable fuse manufactured by SCHURTER Inc., rated for 60V maximum voltage with 500 mA hold current. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement continuity. The part functions as a thermal protection device in through-hole radial configuration, suitable for applications requiring automatic current limiting and self-recovery characteristics.

Substiute Parts

PFRA.050.3

SCHURTER Inc.In Stock: 791PFRA.050.3 Datasheet

Current PartRFQ

PFRA.050.2

SCHURTER Inc.In Stock: 1180PFRA.050.2 Datasheet

DirectRFQ

MF-R050-AP

Bourns Inc.In Stock: 5644MF-R050-AP Datasheet

Parametric EquivalentRFQ

MF-RX050/72-AP

Bourns Inc.In Stock: 1124MF-RX050/72-AP Datasheet

Parametric EquivalentRFQ

MF-RX050/72-AP-17

Bourns Inc.In Stock: 676MF-RX050/72-AP-17 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PFRA.050.3 is determined by strict equivalence across the following critical parameters:

• Voltage - Max: 60V (or higher rated voltage acceptable for 60V operation)
• Current - Hold (Ih) (Max): 500 mA
• Current - Trip (It): 1 A
• Resistance - Initial (Ri) (Min): 410 mOhms
• Resistance - Post Trip (R1) (Max): 1.17 Ohms
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: Radial, Disc
• Physical dimensions and lead spacing compatibility

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalent: PFRA.050.2 from SCHURTER Inc. shares identical electrical specifications and physical form factor. The primary distinction is product status (active vs. obsolete) and packaging format.

Parametric Equivalents: MF-R050-AP and MF-RX050/72-AP series from Bourns Inc. meet all electrical and mechanical requirements. MF-RX050/72-AP and MF-RX050/72-AP-17 operate at 72V maximum voltage, which exceeds the 60V requirement and remains functionally compatible for 60V applications.

Parameter Comparison

Engineering Selection Recommendations

PFRA.050.2 is the primary direct equivalent from SCHURTER Inc. This part maintains identical electrical and mechanical specifications while offering active product status and improved availability. Selection of PFRA.050.2 eliminates any design or qualification concerns related to manufacturer transition.

MF-R050-AP from Bourns Inc. provides parametric equivalence with all critical electrical characteristics matching the PFRA.050.3. This part is suitable for applications where cross-manufacturer substitution is acceptable. The Multifuse® MF-R series carries cURus and TUV certifications.

MF-RX050/72-AP and MF-RX050/72-AP-17 from Bourns Inc. operate at 72V maximum voltage, providing additional voltage margin for 60V applications. Both parts meet all electrical and mechanical requirements. MF-RX050/72-AP-17 includes AEC-Q200 automotive qualification and expanded certification coverage (cUL, cURus, TUV, UL), making it suitable for applications requiring automotive-grade reliability or enhanced regulatory compliance.

Selection between these substitutes depends on procurement availability, certification requirements, and packaging format needs. All listed substitutes maintain ROHS3 compliance and identical operating temperature ranges.

Frequently Asked Questions (FAQ)

Q: Can PFRA.050.2 be used as a direct replacement for PFRA.050.3?

A: Yes. PFRA.050.2 shares identical electrical specifications (60V, 500 mA hold current, 1 A trip current) and physical form factor. The primary difference is product status; PFRA.050.2 is active while PFRA.050.3 is obsolete. Packaging format differs (cut tape vs. bulk), but electrical performance is equivalent.

Q: Are Bourns MF-R050-AP and MF-RX050/72-AP suitable replacements?

A: Yes. Both parts meet all critical electrical and mechanical parameters. MF-R050-AP operates at 60V maximum voltage, matching the original specification exactly. MF-RX050/72-AP operates at 72V, which exceeds the 60V requirement and remains functionally compatible for 60V circuit applications.

Q: What is the difference between MF-RX050/72-AP and MF-RX050/72-AP-17?

A: Both parts are electrically and mechanically identical. The primary differences are packaging format (cut tape vs. tape & box) and certifications. MF-RX050/72-AP-17 includes AEC-Q200 automotive qualification and broader regulatory approvals (cUL, cURus, TUV, UL vs. cURus, TUV).

Q: Do all substitute parts maintain the same physical dimensions?

A: Yes. All listed substitutes share identical dimensions: 0.311" diameter x 0.122" thickness (7.90mm x 3.10mm) with 0.201" (5.10mm) lead spacing. PCB layout and mechanical fit are fully compatible.

Q: Are there any compliance or certification differences between substitutes?

A: All substitutes are ROHS3 compliant. Certification coverage varies: PFRA.050.2 carries CSA, TUV, and UL approvals; MF-R050-AP carries cURus and TUV; MF-RX050/72-AP carries cURus and TUV; MF-RX050/72-AP-17 carries cUL, cURus, TUV, and UL with AEC-Q200 automotive qualification. Select based on application-specific regulatory requirements.

Q: Can the 72V rated parts (MF-RX050/72-AP series) be used in 60V applications?

A: Yes. Higher voltage-rated components are functionally compatible in lower voltage applications. The 72V rating provides additional safety margin and does not affect performance in 60V circuits.