PFVS.170 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The PFVS.170 is a polymeric PTC resettable fuse manufactured by SCHURTER Inc., rated for 16V at 1.7A hold current. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement. The PFVS.170 series provides overcurrent protection with automatic reset capability in strap-mounted configurations, suitable for applications requiring polymeric PTC protection in the 16V/1.7A range.

Key Parameters

Parameter	Value
Voltage - Max	16V
Current - Hold (Ih) (Max)	1.7 A
Current - Trip (It)	3.4 A
Current - Max	100 A
Resistance - Initial (Ri) (Min)	30 mOhms
Resistance - Post Trip (R1) (Max)	105 mOhms
Operating Temperature Range	-40°C ~ 85°C
Type	Polymeric
Mounting Type	User Defined
Package / Case	Strap
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the PFVS.170 is determined by strict equivalence across the following critical parameters:

Voltage rating: 16V maximum
Hold current (Ih): 1.7A maximum
Trip current (It): 3.4A
Initial resistance (Ri): 30 mOhms minimum
Post-trip resistance (R1): 105 mOhms maximum
Operating temperature range: -40°C to 85°C
Package type: Strap configuration
Polymeric PTC technology classification

The VTP170F from Littelfuse Inc. meets all specified electrical and mechanical parameters for direct substitution. Both components share identical voltage, hold current, trip current, resistance characteristics, and operating temperature specifications. The strap package configuration and polymeric PTC construction ensure mechanical and functional compatibility.

Parameter Comparison

Parameter	PFVS.170 (SCHURTER)	VTP170F (Littelfuse)	Match Status
Voltage - Max	16V	16V	Equivalent
Current - Hold (Ih) (Max)	1.7 A	1.7 A	Equivalent
Current - Trip (It)	3.4 A	3.4 A	Equivalent
Current - Max	100 A	100 A	Equivalent
Resistance - Initial (Ri) (Min)	30 mOhms	30 mOhms	Equivalent
Resistance - Post Trip (R1) (Max)	105 mOhms	105 mOhms	Equivalent
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Equivalent
Type	Polymeric	Polymeric	Equivalent
Package / Case	Strap	Strap	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Approval Agency	CSA, TUV, UL	CSA, TUV, UL	Equivalent
Time to Trip	3 s	5 s	Variation
Size / Dimension	0.679" L x 0.201" W (17.25mm x 5.10mm)	0.648" L x 0.283" W (16.45mm x 7.20mm)	Variation
Product Status	Obsolete	Active	Variation

Engineering Selection Recommendations

The VTP170F (Littelfuse PolySwitch® VTP series) is the qualified substitute for the obsolete PFVS.170. Selection is based on the following engineering criteria:

All critical electrical parameters match exactly: voltage, hold current, trip current, and resistance specifications
Both components carry identical regulatory approvals: CSA, TUV, and UL certifications
Both components meet ROHS3 compliance requirements
The VTP170F maintains active product status, ensuring long-term availability and supply chain continuity
Polymeric PTC technology and strap package configuration are identical between both parts
Physical dimensions show minor variation (length and width differences within typical tolerance ranges for strap-mounted components)
Time-to-trip specification differs (3s vs. 5s); this variation must be evaluated against specific application requirements

The VTP170F is suitable for direct replacement in applications where the 5-second trip time is acceptable. Applications with strict trip-time requirements below 5 seconds require additional evaluation.

Frequently Asked Questions (FAQ)

Q: Can the VTP170F directly replace the PFVS.170 in all applications?

A: The VTP170F matches all critical electrical parameters and certifications. However, the time-to-trip specification differs (5s vs. 3s). Verify that the 5-second trip time is acceptable for your specific application before implementation.

Q: What are the physical dimension differences between these parts?

A: The PFVS.170 measures 0.679" L x 0.201" W (17.25mm x 5.10mm), while the VTP170F measures 0.648" L x 0.283" W (16.45mm x 7.20mm). Both use strap mounting. Confirm that the slightly larger width of the VTP170F accommodates your mechanical layout.

Q: Are both parts RoHS compliant?

A: Yes. Both the PFVS.170 and VTP170F are ROHS3 compliant and carry identical regulatory approvals (CSA, TUV, UL).

Q: Why is the PFVS.170 listed as obsolete?

A: The PFVS.170 is classified as obsolete by the manufacturer. The VTP170F from Littelfuse maintains active product status and is the recommended alternative for new designs and ongoing procurement.

Q: Do the hold current and trip current specifications match exactly?

A: Yes. Both components are rated at 1.7A hold current (Ih) and 3.4A trip current (It), with identical initial and post-trip resistance specifications.

Q: What certifications apply to both parts?

A: Both the PFVS.170 and VTP170F carry CSA, TUV, and UL approvals, ensuring compliance with major regulatory standards for overcurrent protection devices.

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