PFRX.375 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The PFRX.375 is a polymeric PTC resettable fuse rated for 60V at 3.75A hold current, manufactured by SCHURTER Inc. in a through-hole radial disc package. This component is classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement. The PFRX.375 provides circuit protection with automatic reset capability across industrial and consumer applications requiring 60V operation at 3.75A hold current specifications.

Substiute Parts

PFRX.375

SCHURTER Inc.In Stock: 895PFRX.375 Datasheet

Current PartRFQ

PFRY.375

SCHURTER Inc.In Stock: 1765PFRY.375 Datasheet

DirectRFQ

60R375XH

Littelfuse Inc.In Stock: 123160R375XH Datasheet

DirectRFQ

72R375XH

Littelfuse Inc.In Stock: 323172R375XH Datasheet

DirectRFQ

PTR060V0375-BK

Eaton - Electronics DivisionIn Stock: 1022PTR060V0375-BK Datasheet

DirectRFQ

PTR060V0375-BK1

Eaton - Electronics DivisionIn Stock: 800PTR060V0375-BK1 Datasheet

DirectRFQ

60R185XMR

Littelfuse Inc.In Stock: 918160R185XMR Datasheet

SimilarRFQ

60R300XF

Littelfuse Inc.In Stock: 238460R300XF Datasheet

SimilarRFQ

PTR060V0375-TR1

Eaton - Electronics DivisionIn Stock: 689PTR060V0375-TR1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PFRX.375 are classified into two categories based on electrical parameter compatibility:

Direct Substitutes (Identical Electrical Specifications): Parts meeting all critical electrical parameters: 60V maximum voltage, 3.75A hold current, 7.5A trip current, 24s time to trip, 30 mOhms initial resistance, and 80 mOhms post-trip resistance. These parts maintain identical protection characteristics and are interchangeable in circuit design.

Similar Substitutes (Voltage or Current Variations): Parts sharing the same voltage rating (60V) or current rating (3.75A) but differing in one or more electrical parameters. These require circuit-level evaluation to confirm compatibility with the original application requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Identical Electrical Performance):

60R375XH (Littelfuse Inc.) and PTR060V0375-BK / PTR060V0375-BK1 (Eaton - Electronics Division) provide direct electrical equivalence to PFRX.375 with all critical parameters matched: 60V, 3.75A hold current, 7.5A trip current, and 24s trip time. All three are active products with current manufacturing support. Lead spacing differences (0.402" vs 0.394") are minor and accommodate standard through-hole PCB layouts. Both manufacturers hold cURus and TUV certifications. Selection between these options depends on packaging availability and supply chain preference.

Voltage-Rated Alternative:

PFRY.375 (SCHURTER Inc.) and 72R375XH (Littelfuse Inc.) maintain identical current and protection characteristics but operate at 72V maximum. These are suitable for applications where the circuit voltage does not exceed 60V, as the higher voltage rating provides additional safety margin. Both are active products with full certifications.

Current-Rated Alternatives:

60R300XF (Littelfuse Inc.) operates at 60V with 3A hold current and 6A trip current, representing a lower current protection threshold. This part is suitable only for applications where the original 3.75A hold current specification can be reduced. 60R185XMR (Littelfuse Inc.) provides 60V operation at 1.85A hold current with different lead spacing (0.201"), requiring PCB layout modification and is suitable only for significantly lower current applications.

Packaging Consideration:

PTR060V0375-TR1 (Eaton - Electronics Division) is identical to PTR060V0375-BK1 electrically but supplied in tape and reel packaging, suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can PFRY.375 replace PFRX.375 directly?

A: PFRY.375 matches all electrical protection parameters (3.75A hold, 7.5A trip, 24s trip time, 30 mOhms initial resistance, 80 mOhms post-trip resistance) but operates at 72V maximum versus 60V. Direct substitution is valid for circuits operating at 60V or below, as the higher voltage rating does not affect protection performance at lower voltages.

Q: What is the difference between 60R375XH and PTR060V0375-BK?

A: Both parts provide identical electrical specifications (60V, 3.75A hold, 7.5A trip, 24s trip time). The primary difference is lead spacing: 60R375XH uses 0.402" spacing while PTR060V0375-BK uses 0.394" spacing. Both accommodate standard through-hole PCB designs. Selection depends on PCB layout requirements and manufacturer availability.

Q: Can 60R300XF be used instead of PFRX.375?

A: 60R300XF operates at 60V with 3A hold current and 6A trip current, compared to PFRX.375 at 3.75A hold and 7.5A trip. This part provides lower protection thresholds and is suitable only if the application circuit can operate safely with reduced current protection limits.

Q: What does lead spacing affect in PCB design?

A: Lead spacing determines the distance between component pins on the PCB. PFRX.375 and most direct substitutes use 0.402" (10.20mm) spacing, while Eaton parts use 0.394" (10.00mm). Both are compatible with standard through-hole PCB layouts, but PCB footprints must match the selected part's lead spacing to ensure proper mounting.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts are RoHS compliant. PFRX.375, 60R375XH, 72R375XH, 60R185XMR, 60R300XF, and PTR060V0375-TR1 are ROHS3 compliant. PTR060V0375-BK and PTR060V0375-BK1 are RoHS compliant. Compliance status is maintained across all active alternatives.

Q: Which substitute offers the best supply availability?

A: 72R375XH (Littelfuse Inc.) shows the highest inventory at 3,150 pieces. 60R300XF (Littelfuse Inc.) has 2,372 pieces available. PFRY.375 (SCHURTER Inc.) has 1,752 pieces. All three represent strong supply positions for ongoing procurement.