VTP170SSF Equivalent & Substitute Parts

Part Overview

The VTP170SSF is a polymeric PTC resettable fuse manufactured by Littelfuse Inc. as part of the PolySwitch® VTP series. This component provides overcurrent protection with automatic reset capability, designed for applications requiring reliable circuit protection without permanent component replacement. The part is currently in active production status with 902 units available in new original stock. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the same product series and manufacturer specifications.

Key Parameters

Parameter	Value
Voltage - Max	16V
Current - Hold (Ih) (Max)	1.7 A
Current - Trip (It)	3.4 A
Current - Max	100 A
Time to Trip	5 s
Resistance - Initial (Ri) (Min)	30 mOhms
Resistance - Post Trip (R1) (Max)	105 mOhms
Operating Temperature	-40°C ~ 85°C
Package / Case	Strap
Size / Dimension	0.648" L x 0.283" W (16.45mm x 7.20mm)
Thickness (Max)	0.032" (0.80mm)
RoHS Status	ROHS3 Compliant
Approval Agency	CSA, TUV, UL

Substitute Part Grouping Explanation

Substitution eligibility for the VTP170SSF is determined by strict equivalence across the following critical parameters:

Voltage rating: 16V maximum
Current hold specification: 1.7 A maximum
Current trip specification: 3.4 A
Resistance characteristics: Initial minimum 30 mOhms, post-trip maximum 105 mOhms
Operating temperature range: -40°C to 85°C
Package type: Strap configuration
Physical dimensions: 0.648" L x 0.283" W (16.45mm x 7.20mm)
Regulatory compliance: CSA, TUV, UL approval
Environmental compliance: ROHS3 compliant

The VTP170F qualifies as a parametric equivalent based on identical electrical specifications and mechanical dimensions. The primary distinction is packaging format: VTP170SSF is supplied in strap packaging, while VTP170F is supplied in bulk packaging. Both parts maintain identical performance characteristics and regulatory certifications.

Parameter Comparison

Parameter	VTP170SSF	VTP170F	Match
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Yes
Series	PolySwitch®, VTP	PolySwitch®, VTP	Yes
Type	Polymeric	Polymeric	Yes
Voltage - Max	16V	16V	Yes
Current - Hold (Ih) (Max)	1.7 A	1.7 A	Yes
Current - Trip (It)	3.4 A	3.4 A	Yes
Current - Max	100 A	100 A	Yes
Time to Trip	5 s	5 s	Yes
Resistance - Initial (Ri) (Min)	30 mOhms	30 mOhms	Yes
Resistance - Post Trip (R1) (Max)	105 mOhms	105 mOhms	Yes
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Yes
Package / Case	Strap	Strap	Yes
Size / Dimension	0.648" L x 0.283" W (16.45mm x 7.20mm)	0.648" L x 0.283" W (16.45mm x 7.20mm)	Yes
Thickness (Max)	0.032" (0.80mm)	0.032" (0.80mm)	Yes
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Yes
Approval Agency	CSA, TUV, UL	CSA, TUV, UL	Yes
Product Status	Active	Active	Yes
Packaging Format	Strap	Bulk	Different

Engineering Selection Recommendations

Both VTP170SSF and VTP170F are active production components from Littelfuse Inc. with identical electrical performance and regulatory certifications. Selection between these parts is determined by packaging and supply requirements rather than functional capability.

The VTP170SSF, supplied in strap packaging, is suitable for applications requiring pre-formatted or tape-and-reel delivery configurations. The VTP170F, supplied in bulk packaging, accommodates applications with flexible packaging requirements or high-volume procurement scenarios.

Both parts maintain full compliance with ROHS3 environmental standards and carry CSA, TUV, and UL approvals, confirming suitability for regulated applications. The identical electrical specifications—including 16V maximum voltage, 1.7 A hold current, 3.4 A trip current, and 5-second trip time—ensure functional interchangeability in circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can VTP170F be used as a direct replacement for VTP170SSF?

A: Yes. Both parts are electrically and mechanically identical. The difference is packaging format: VTP170SSF uses strap packaging while VTP170F uses bulk packaging. Functional performance in the circuit is identical.

Q: What are the critical parameters that define substitution eligibility?

A: Substitution is valid when the following parameters match: voltage rating (16V), current hold specification (1.7 A), current trip specification (3.4 A), operating temperature range (-40°C to 85°C), physical dimensions (0.648" L x 0.283" W), and regulatory certifications (CSA, TUV, UL).

Q: Are there any compliance differences between VTP170SSF and VTP170F?

A: No. Both parts carry identical regulatory approvals (CSA, TUV, UL) and are ROHS3 compliant. Compliance status is equivalent.

Q: What is the significance of the packaging difference?

A: Packaging format affects supply chain logistics and assembly processes. Strap packaging (VTP170SSF) is typically used for automated tape-and-reel applications, while bulk packaging (VTP170F) provides flexibility for manual assembly or alternative handling methods. Electrical performance is unaffected.

Q: Are both parts currently available?

A: Yes. VTP170SSF has 902 units in new original stock. VTP170F has 11,555 units in new original stock. Both maintain active production status.

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