SRP175SF Equivalent & Substitute Parts

Part Overview

The SRP175SF is an active polymeric PTC resettable fuse manufactured by Littelfuse Inc., part of 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 user-defined strap mounting applications and is ROHS3 compliant with CSA, TUV, and UL approvals.

Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing due to inventory availability, supply chain considerations, or packaging format preferences while maintaining identical electrical and mechanical performance characteristics.

Key Parameters

Parameter	Value
Voltage - Max	15V
Current - Hold (Ih) (Max)	1.75 A
Current - Trip (It)	3.8 A
Current - Max	100 A
Time to Trip	5 s
Resistance - Initial (Ri) (Min)	50 mOhms
Resistance - Post Trip (R1) (Max)	120 mOhms
Operating Temperature	-40°C ~ 85°C
Package / Case	Strap
Size / Dimension	0.866" L x 0.199" W (22.00mm x 5.05mm)
Thickness (Max)	0.039" (1.00mm)
Type	Polymeric
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SRP175SF are identified based on strict parametric equivalence across all critical electrical and mechanical specifications. The substitution logic is based on the following key parameters that must remain identical:

Voltage - Max: 15V
Current - Hold (Ih) (Max): 1.75 A
Current - Trip (It): 3.8 A
Current - Max: 100 A
Time to Trip: 5 s
Resistance - Initial (Ri) (Min): 50 mOhms
Resistance - Post Trip (R1) (Max): 120 mOhms
Operating Temperature: -40°C ~ 85°C
Package / Case: Strap
Size / Dimension: 0.866" L x 0.199" W (22.00mm x 5.05mm)
Thickness (Max): 0.039" (1.00mm)
Type: Polymeric
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All identified substitute parts meet these criteria and are therefore electrically and mechanically interchangeable with the SRP175SF in applications requiring polymeric PTC resettable fuse protection.

Parameter Comparison

Parameter	SRP175SF (Littelfuse)	SRP175F (Littelfuse)	0ZSA0175FF1E (Bel Fuse)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Bel Fuse Inc.
Series	PolySwitch®, SRP	PolySwitch®, SRP	0ZSA
Product Status	Active	Active	Active
Type	Polymeric	Polymeric	Polymeric
Voltage - Max	15V	15V	15V
Current - Hold (Ih) (Max)	1.75 A	1.75 A	1.75 A
Current - Trip (It)	3.8 A	3.8 A	3.8 A
Current - Max	100 A	100 A	100 A
Time to Trip	5 s	5 s	5 s
Resistance - Initial (Ri) (Min)	50 mOhms	50 mOhms	50 mOhms
Resistance - Post Trip (R1) (Max)	120 mOhms	120 mOhms	120 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	User Defined	User Defined	User Defined
Package / Case	Strap	Strap	Strap
Size / Dimension	0.866" L x 0.199" W (22.00mm x 5.05mm)	0.866" L x 0.199" W (22.00mm x 5.05mm)	0.866" L x 0.199" W (22.00mm x 5.05mm)
Thickness (Max)	0.039" (1.00mm)	0.039" (1.00mm)	0.039" (1.00mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Approval Agency	CSA, TUV, UL	CSA, TUV, UL	cURus, TUV
ECCN	EAR99	EAR99	EAR99
HTSUS	8533.40.8070	8533.40.8070	8533.40.8070

Engineering Selection Recommendations

All three parts—SRP175SF, SRP175F, and 0ZSA0175FF1E—are active products with identical electrical and mechanical specifications. Selection between these polymeric PTC resettable fuses should be based on the following factors:

Littelfuse SRP175SF and SRP175F: Both are manufactured by Littelfuse Inc. and hold CSA, TUV, and UL approvals. The primary difference is packaging format: SRP175SF is supplied in strap packaging, while SRP175F is supplied in bulk packaging. Both are ROHS3 compliant with MSL 1 (Unlimited) rating.

Bel Fuse 0ZSA0175FF1E: Manufactured by Bel Fuse Inc., this part maintains identical electrical and mechanical parameters and is ROHS3 compliant with MSL 1 (Unlimited) rating. Approvals include cURus and TUV certifications. This part is suitable for applications where multi-source qualification is required.

All three parts are suitable for direct substitution in 15V, 1.75A polymeric PTC resettable fuse applications requiring strap mounting configuration.

Frequently Asked Questions (FAQ)

Q: Can SRP175F be used as a direct replacement for SRP175SF?

A: Yes. Both parts are manufactured by Littelfuse Inc. and share identical electrical specifications (15V, 1.75A hold current, 3.8A trip current, 5s trip time) and mechanical dimensions (22.00mm x 5.05mm x 1.00mm). The difference is packaging format only.

Q: Is the 0ZSA0175FF1E from Bel Fuse electrically equivalent to the Littelfuse SRP175SF?

A: Yes. The 0ZSA0175FF1E maintains all critical electrical parameters: 15V maximum voltage, 1.75A hold current, 3.8A trip current, 100A maximum current, and 5s trip time. Mechanical dimensions and resistance specifications are identical. Both are ROHS3 compliant with MSL 1 (Unlimited).

Q: What are the key parameters that define substitutability for this PTC resettable fuse?

A: Substitutability is determined by: voltage rating (15V), hold current (1.75A), trip current (3.8A), trip time (5s), initial resistance (50 mOhms minimum), post-trip resistance (120 mOhms maximum), operating temperature range (-40°C to 85°C), physical dimensions (22.00mm x 5.05mm x 1.00mm), and strap package configuration.

Q: Are there differences in regulatory approvals between these parts?

A: SRP175SF and SRP175F hold CSA, TUV, and UL approvals. The 0ZSA0175FF1E holds cURus and TUV approvals. All three are ROHS3 compliant. Application-specific regulatory requirements should be verified against required certifications.

Q: What is the difference between the SRP175SF and SRP175F packaging?

A: SRP175SF is supplied in strap packaging format, while SRP175F is supplied in bulk packaging. Electrical and mechanical specifications are identical.

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