RXE375 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The RXE375 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 72V at 3.75A hold current with through-hole radial disc packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. Substitute parts maintain the same electrical performance characteristics while offering active product status and improved compliance ratings.

Substiute Parts

RXE375

Littelfuse Inc.In Stock: 1092RXE375 Datasheet

Current PartRFQ

RXEF375

LittelfuseIn Stock: 1777RXEF375 Datasheet

DirectRFQ

60R375XH

Littelfuse Inc.In Stock: 123160R375XH Datasheet

MFR RecommendedRFQ

0ZRC0375FF1A

Bel Fuse Inc.In Stock: 55720ZRC0375FF1A Datasheet

DirectRFQ

MF-RX375/72-0

Bourns Inc.In Stock: 6565MF-RX375/72-0 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RXE375 is determined by the following criteria:

Primary Electrical Parameters:

• Voltage - Max: 72V (exact match required for direct substitution)
• Current - Hold (Ih) (Max): 3.75 A (exact match required)
• Current - Trip (It): 7.5 A (exact match required)
• Time to Trip: 24 s (exact match required)
• Resistance - Initial (Ri) (Min): 30 mOhms (exact match required)
• Resistance - Post Trip (R1) (Max): 80 mOhms (exact match required)

Mechanical Parameters:

• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Disc (exact match required)
• Lead Spacing: 0.400" (10.15mm) (tolerance within ±0.002")

Compliance Parameters:

• RoHS Status: ROHS3 Compliant preferred
• Approval Agency: CSA, TUV, UL minimum

Substitute parts are grouped into two categories: direct electrical equivalents (identical voltage and current ratings) and functional equivalents (different voltage ratings with identical current and thermal characteristics).

Parameter Comparison

Engineering Selection Recommendations

Direct Electrical Equivalents (72V, 3.75A):

RXEF375 (Littelfuse) is the primary direct substitute for RXE375. Both components share identical electrical specifications and are manufactured by the same supplier. RXEF375 offers active product status, ROHS3 compliance, and expanded approval certifications including CQC. Lead spacing matches the original specification at 0.400" (10.15mm).

MF-RX375/72-0 (Bourns Inc.) is an alternative direct equivalent with identical voltage and current ratings. This component maintains 72V maximum voltage and 3.75A hold current specifications. MF-RX375/72-0 is ROHS3 compliant with active product status. Lead spacing is 0.402" (10.20mm), representing a 0.002" tolerance variation from the original specification.

Functional Equivalent (60V, 3.75A):

60R375XH (Littelfuse Inc.) operates at 60V maximum voltage with identical 3.75A hold current and thermal characteristics. This component is suitable for applications where the circuit voltage does not exceed 60V. Lead spacing is 0.402" (10.20mm). ROHS3 compliance and active product status are confirmed.

Higher Voltage Alternative (90V, 3.75A):

0ZRC0375FF1A (Bel Fuse Inc.) provides 90V maximum voltage rating with identical 3.75A hold current specifications. This component is suitable for applications requiring higher voltage margin. AEC-Q200 automotive qualification is included. Lead spacing is 0.402" (10.20mm). ROHS3 compliance and active product status are confirmed.

Frequently Asked Questions (FAQ)

Q: Can RXEF375 be used as a direct replacement for RXE375?

A: Yes. RXEF375 is a direct electrical equivalent with identical voltage (72V), hold current (3.75A), trip current (7.5A), and thermal characteristics (24s trip time). Both components share the same radial disc package and through-hole mounting. Lead spacing is identical at 0.400" (10.15mm). RXEF375 offers improved compliance status with ROHS3 certification and active product availability.

Q: What is the difference between RXEF375 and MF-RX375/72-0?

A: Both components are direct electrical equivalents with 72V and 3.75A specifications. The primary differences are manufacturer (Littelfuse vs. Bourns) and lead spacing tolerance (0.400" vs. 0.402"). Both are ROHS3 compliant and actively produced. Component selection depends on supplier availability and PCB layout constraints.

Q: Can 60R375XH be used in place of RXE375?

A: 60R375XH is a functional equivalent only for applications where circuit voltage does not exceed 60V. The component maintains identical 3.75A hold current and 24s trip time. If the original design operates at 72V, 60R375XH will not provide adequate voltage protection and is not suitable.

Q: Is 0ZRC0375FF1A compatible with RXE375 designs?

A: 0ZRC0375FF1A is electrically compatible for applications requiring higher voltage margin. The component provides 90V maximum voltage with identical 3.75A hold current and thermal response. Physical dimensions vary slightly (lead spacing 0.402" vs. 0.400"), requiring PCB layout verification. AEC-Q200 qualification makes this component suitable for automotive applications.

Q: What are the lead spacing tolerances for substitute parts?

A: RXE375 and RXEF375 specify 0.400" (10.15mm) lead spacing. MF-RX375/72-0, 60R375XH, and 0ZRC0375FF1A specify 0.402" (10.20mm) lead spacing. The 0.002" difference is within standard PCB tolerance but requires verification against board layout specifications before component substitution.

Q: Are all substitute parts RoHS compliant?

A: Yes. RXEF375, MF-RX375/72-0, 60R375XH, and 0ZRC0375FF1A are all ROHS3 compliant. The original RXE375 is RoHS non-compliant, making substitution necessary for applications requiring RoHS certification.

Q: Which substitute part offers the best availability?

A: 0ZRC0375FF1A (Bel Fuse Inc.) shows the highest inventory level at 5521 pieces. MF-RX375/72-0 (Bourns Inc.) has 6502 pieces in stock. RXEF375 (Littelfuse) has 1700 pieces available. Inventory levels are subject to change and should be confirmed with suppliers.