PFRX.160.3 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The PFRX.160.3 is a polymeric PTC resettable fuse manufactured by SCHURTER Inc., rated for 60V maximum voltage with 1.6A hold current. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The part functions as a thermal protection device in through-hole radial configuration, suitable for applications requiring automatic circuit protection with reset capability.

Key Parameters

Parameter	Value
Voltage - Max	60V
Current - Hold (Ih) (Max)	1.6 A
Current - Trip (It)	3.2 A
Current - Max	40 A
Time to Trip	11.4 s
Resistance - Initial (Ri) (Min)	90 mOhms
Resistance - Post Trip (R1) (Max)	220 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Lead Spacing	0.201" (5.10mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the PFRX.160.3 is determined by the following critical parameters:

Voltage Rating: Substitute parts must have a maximum voltage rating equal to or greater than 60V
Current Hold (Ih): Must match 1.6A specification
Current Trip (It): Must match 3.2A specification
Mounting Type: Must be Through Hole configuration
Package Type: Must be Radial, Disc format
Lead Spacing: Must accommodate 0.201" (5.10mm) spacing or compatible PCB layouts
Resistance Characteristics: Initial resistance (Ri) and post-trip resistance (R1) must fall within specified ranges
Operating Temperature Range: Must support -40°C ~ 85°C minimum

The identified substitute parts meet these criteria while offering improved product status (Active vs. Obsolete) and expanded certification coverage.

Parameter Comparison

Parameter	PFRX.160.3 (Main)	PFRY.160 (Substitute)	RXEF160-AP (Substitute)
Manufacturer	SCHURTER Inc.	SCHURTER Inc.	Littelfuse Inc.
Product Status	Obsolete	Active	Active
Voltage - Max	60V	72V	72V
Current - Hold (Ih) (Max)	1.6 A	1.6 A	1.6 A
Current - Trip (It)	3.2 A	3.2 A	3.2 A
Current - Max	40 A	40 A	40 A
Time to Trip	11.4 s	11.4 s	11.4 s
Resistance - Initial (Ri) (Min)	90 mOhms	90 mOhms	90 mOhms
Resistance - Post Trip (R1) (Max)	220 mOhms	220 mOhms	220 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc
Lead Spacing	0.201" (5.10mm)	0.201" (5.10mm)	0.199" (5.05mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, TUV, UL	cURus, TUV	CQC, CSA, TUV, UL

Engineering Selection Recommendations

Both PFRY.160 and RXEF160-AP meet the functional requirements for substitution of the obsolete PFRX.160.3. Selection between these options depends on certification and supply considerations:

PFRY.160 (SCHURTER Inc.): Maintains manufacturer continuity with SCHURTER Inc. as the original supplier. Holds cURus and TUV certifications. Voltage rating of 72V provides margin above the 60V requirement. Lead spacing matches the original specification exactly at 0.201" (5.10mm).

RXEF160-AP (Littelfuse Inc.): Offers broader certification coverage including CQC, CSA, TUV, and UL approvals. Voltage rating of 72V exceeds the original requirement. Lead spacing of 0.199" (5.05mm) is within acceptable tolerance for standard through-hole PCB layouts. Packaged in Cut Tape format with higher inventory availability.

Both parts are ROHS3 compliant and maintain identical electrical performance characteristics across all critical parameters.

Frequently Asked Questions (FAQ)

Q: Can PFRY.160 or RXEF160-AP be used as direct replacements for PFRX.160.3?

A: Yes. Both substitute parts match the critical electrical parameters: 1.6A hold current, 3.2A trip current, 11.4s trip time, and identical resistance characteristics. Both support the -40°C to 85°C operating temperature range and use through-hole radial disc packaging compatible with standard PCB layouts.

Q: What is the significance of the voltage rating difference (60V vs. 72V)?

A: The substitute parts are rated for 72V maximum voltage, which exceeds the original 60V specification. This higher rating provides additional design margin and does not create compatibility issues in applications designed for 60V operation. The component will function identically in circuits operating at or below 60V.

Q: Are there any physical dimension differences that affect PCB compatibility?

A: Lead spacing differs slightly between parts. PFRX.160.3 and PFRY.160 both specify 0.201" (5.10mm) lead spacing. RXEF160-AP specifies 0.199" (5.05mm) lead spacing. This 0.002" difference is within standard PCB manufacturing tolerances and does not prevent interchangeability on existing through-hole layouts.

Q: Which substitute part should be selected for new designs?

A: Selection depends on certification requirements and supply chain preferences. RXEF160-AP offers the broadest certification coverage (CQC, CSA, TUV, UL) and higher inventory availability. PFRY.160 maintains manufacturer continuity with SCHURTER Inc. Both are active products with equivalent electrical performance.

Q: Are all three parts ROHS3 compliant?

A: Yes. PFRX.160.3, PFRY.160, and RXEF160-AP are all ROHS3 compliant. All parts are REACH unaffected and classified under ECCN EAR99.

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