SRP175F Polymeric PTC Resettable Fuse - Equivalent & Substitute Parts

Part Overview

The SRP175F is an active polymeric PTC resettable fuse manufactured by Littelfuse Inc. in the PolySwitch® SRP series. This component provides overcurrent protection with a 15V maximum voltage rating and 1.75A hold current specification. The device is designed for applications requiring automatic reset functionality after fault conditions are cleared. Substitute parts are identified to provide equivalent electrical and mechanical performance when the primary part is unavailable or when supply chain optimization is required.

Substiute Parts

SRP175F

Littelfuse Inc.In Stock: 8431SRP175F Datasheet

Current PartRFQ

0ZSA0175FF1E

Bel Fuse Inc.In Stock: 41170ZSA0175FF1E Datasheet

DirectRFQ

MF-S175

Bourns Inc.In Stock: 7154MF-S175 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SRP175F are qualified based on the following electrical and mechanical parameters:

• Voltage - Max: 15V (exact match required)
• Current - Hold (Ih) (Max): 1.75 A (exact match required)
• Current - Trip (It): 3.8 A (exact match required)
• Resistance - Initial (Ri) (Min): 50 mOhms (exact match required)
• Resistance - Post Trip (R1) (Max): 120 mOhms (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (exact match required)
• Package / Case: Strap (exact match required)
• Type: Polymeric (exact match required)
• RoHS Status: ROHS3 Compliant (exact match required)

The identified substitute parts meet all critical electrical specifications and environmental requirements. Dimensional variations within the strap package category are permissible provided the component integrates within the application's physical constraints.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain active product status and ROHS3 compliance. The SRP175F carries CSA, TUV, and UL certifications. The substitute parts 0ZSA0175FF1E and MF-S175 carry cURus and TUV certifications.

The 0ZSA0175FF1E from Bel Fuse provides dimensional equivalence to the SRP175F with identical length, width, and thickness specifications. This part is suitable for direct substitution in applications where the original certification set is not a constraint.

The MF-S175 from Bourns meets all critical electrical parameters with a 1mm length variation (21.00mm versus 22.00mm). The time-to-trip specification is 4 seconds compared to 5 seconds for the primary part. This dimensional and temporal difference requires verification of application-specific mechanical and timing requirements before selection.

Frequently Asked Questions (FAQ)

Q: Can the 0ZSA0175FF1E be used as a direct replacement for the SRP175F?

A: Yes. The 0ZSA0175FF1E matches all critical electrical parameters and physical dimensions. Certification differences (cURus/TUV versus CSA/TUV/UL) must be evaluated against application requirements.

Q: What is the significance of the time-to-trip difference between MF-S175 and SRP175F?

A: The MF-S175 trips in 4 seconds while the SRP175F trips in 5 seconds. This 1-second difference may affect circuit protection timing in applications with specific fault response requirements. Verify compatibility with system design specifications.

Q: Are all three parts physically compatible with the same mounting interface?

A: The SRP175F and 0ZSA0175FF1E share identical strap dimensions (22.00mm x 5.05mm x 1.00mm). The MF-S175 has a 1mm shorter length (21.00mm). Physical fit must be confirmed for the application's specific mounting constraints.

Q: Do all substitute parts maintain the same hold current specification?

A: Yes. All three parts specify a maximum hold current (Ih) of 1.75A and trip current (It) of 3.8A, ensuring equivalent overcurrent protection performance.

Q: What compliance certifications should I consider when selecting a substitute?

A: The SRP175F carries CSA, TUV, and UL approvals. The substitute parts carry cURus and TUV approvals. Select based on the regulatory requirements of your target market and application.