PFRA.025.3 Equivalent & Substitute Parts

Part Overview

The PFRA.025.3 is a polymeric PTC resettable fuse manufactured by SCHURTER Inc., rated for 60V maximum voltage with a 250 mA hold current. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement continuity. Polymeric PTC resettable fuses function as automatic reset protection devices, interrupting circuit current when thermal conditions exceed design thresholds and restoring operation once cooled. The obsolete status of the PFRA.025.3 necessitates evaluation of active alternative components that maintain electrical and mechanical compatibility with existing circuit designs.

Substiute Parts

PFRA.025.3

SCHURTER Inc.In Stock: 774PFRA.025.3 Datasheet

Current PartRFQ

PFRA.020.2

SCHURTER Inc.In Stock: 833PFRA.020.2 Datasheet

DirectRFQ

MF-R025-AP

Bourns Inc.In Stock: 790MF-R025-AP Datasheet

Parametric EquivalentRFQ

MF-R025-AP-17

Bourns Inc.In Stock: 1202MF-R025-AP-17 Datasheet

Parametric EquivalentRFQ

MF-RX025/72-AP-17

Bourns Inc.In Stock: 857MF-RX025/72-AP-17 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PFRA.025.3 is determined by strict equivalence across the following critical parameters: maximum voltage rating (60V), hold current (250 mA), trip current (500 mA), time to trip (2.5 s), initial resistance (1 Ohms minimum), post-trip resistance (3 Ohms maximum), operating temperature range (-40°C to 85°C), through-hole radial mounting configuration, and physical dimensions (0.291" diameter × 0.122" thickness, 0.201" lead spacing).

Substitute parts are grouped into two categories:

Direct Manufacturer Substitute: PFRA.020.2 shares the same manufacturer (SCHURTER Inc.) and series (PFRA) but operates at reduced current specifications (200 mA hold, 400 mA trip). This part is suitable only when circuit requirements permit lower current ratings.

Parametric Equivalents: MF-R025-AP, MF-R025-AP-17, and MF-RX025/72-AP-17 are manufactured by Bourns Inc. under the Multifuse® MF-R series. MF-R025-AP and MF-R025-AP-17 maintain identical electrical specifications to the PFRA.025.3 (60V, 250 mA hold, 500 mA trip, 2.5 s trip time). MF-RX025/72-AP-17 operates at elevated voltage (72V) with identical current and thermal characteristics, suitable for applications requiring higher voltage margin.

Parameter Comparison

Engineering Selection Recommendations

Full Electrical Equivalents: MF-R025-AP and MF-R025-AP-17 are direct parametric equivalents to the PFRA.025.3, matching all critical electrical specifications including voltage, hold current, trip current, and trip time. Both parts are active products with ROHS3 compliance. MF-R025-AP-17 carries AEC-Q200 automotive qualification and expanded approval agency certifications (cUL, cURus, TUV, UL), providing enhanced compliance documentation for regulated applications.

Elevated Voltage Alternative: MF-RX025/72-AP-17 maintains identical current and thermal characteristics while providing 72V maximum voltage rating. This part is suitable for applications where the original 60V specification provides insufficient voltage margin or where system voltage may exceed 60V. AEC-Q200 qualification and comprehensive agency approvals are included.

Current-Reduced Alternative: PFRA.020.2 is an active SCHURTER product within the same PFRA series. This part operates at 200 mA hold current and 400 mA trip current with marginally faster trip time (2.2 s versus 2.5 s) and higher post-trip resistance (4.4 Ohms maximum). Selection of PFRA.020.2 is limited to circuits where reduced current protection is acceptable and where the higher initial resistance (1.5 Ohms minimum) does not compromise circuit performance.

Frequently Asked Questions (FAQ)

Q: Can MF-R025-AP directly replace PFRA.025.3 in existing designs?

A: Yes. MF-R025-AP matches all critical electrical parameters: 60V maximum voltage, 250 mA hold current, 500 mA trip current, 2.5 s trip time, 1 Ohms minimum initial resistance, and 3 Ohms maximum post-trip resistance. Physical dimensions and lead spacing are identical. Both components are polymeric PTC resettable fuses in radial disc configuration with through-hole mounting.

Q: What is the difference between MF-R025-AP and MF-R025-AP-17?

A: Both parts are parametric equivalents with identical electrical specifications. MF-R025-AP-17 includes AEC-Q200 automotive qualification and carries expanded approval agency certifications (cUL, cURus, TUV, UL) compared to MF-R025-AP (cURus, TUV). Selection depends on application requirements for automotive qualification and regulatory compliance documentation.

Q: When should MF-RX025/72-AP-17 be selected instead of MF-R025-AP-17?

A: MF-RX025/72-AP-17 is selected when circuit voltage may exceed 60V or when design margin requires higher voltage rating. This part maintains identical current specifications (250 mA hold, 500 mA trip) and trip time (2.5 s) while providing 72V maximum voltage rating. Physical dimensions and mounting configuration remain unchanged.

Q: Is PFRA.020.2 a suitable replacement for PFRA.025.3?

A: PFRA.020.2 is a partial substitute suitable only when circuit requirements permit reduced current protection. This part operates at 200 mA hold current and 400 mA trip current, compared to the PFRA.025.3 specification of 250 mA hold and 500 mA trip. Initial resistance is higher (1.5 Ohms minimum versus 1 Ohms), and post-trip resistance is higher (4.4 Ohms maximum versus 3 Ohms). Electrical circuit analysis is required to confirm compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. PFRA.025.3, PFRA.020.2, MF-R025-AP, MF-R025-AP-17, and MF-RX025/72-AP-17 are all ROHS3 compliant. All parts are REACH unaffected and classified under ECCN EAR99.

Q: What packaging options are available for these parts?

A: PFRA.025.3 is supplied in standard packaging. PFRA.020.2 is available in Cut Tape (CT) packaging. MF-R025-AP, MF-R025-AP-17, and MF-RX025/72-AP-17 are supplied in Tape & Box (TB) packaging. Packaging selection may affect procurement lead time and minimum order quantities.