LVR005K Equivalent & Substitute Parts

Part Overview

The LVR005K is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc. in the PolySwitch® LVR series. This component is rated for 240V (265V internal) with a 50 mA hold current and is designed for through-hole radial mounting in disc configuration. The LVR005K is currently listed as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Voltage - Max	240V (265V Int)
Current - Hold (Ih) (Max)	50 mA
Current - Trip (It)	120 mA
Current - Max	1 A
Time to Trip	10 s
Resistance - Initial (Ri) (Min)	18.5 Ohms
Resistance - Post Trip (R1) (Max)	65 Ohms
Operating Temperature	-20°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Lead Spacing	0.200" (5.08mm)
Approval Agency	CQC, CSA, TUV, UL
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LVR005K is determined by strict equivalence across the following critical parameters:

Voltage rating: 240V (265V internal) maximum
Current hold specification: 50 mA maximum
Current trip specification: 120 mA
Maximum current capacity: 1 A
Time to trip: 10 seconds
Initial resistance: 18.5 Ohms minimum
Post-trip resistance: 65 Ohms maximum
Operating temperature range: -20°C to 85°C
Mounting configuration: Through-hole radial disc
Lead spacing: 0.200" (5.08mm)
Regulatory compliance: CQC, CSA, TUV, UL certifications
RoHS compliance: ROHS3 Compliant

The LVR005NK meets all these criteria and is classified as a direct substitute for the obsolete LVR005K.

Parameter Comparison

Parameter	LVR005K (Main Part)	LVR005NK (Substitute)	Match Status
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Identical
Series	PolySwitch®, LVR	PolySwitch®, LVR	Identical
Type	Polymeric	Polymeric	Identical
Voltage - Max	240V (265V Int)	240V (265V Int)	Identical
Current - Hold (Ih) (Max)	50 mA	50 mA	Identical
Current - Trip (It)	120 mA	120 mA	Identical
Current - Max	1 A	1 A	Identical
Time to Trip	10 s	10 s	Identical
Resistance - Initial (Ri) (Min)	18.5 Ohms	18.5 Ohms	Identical
Resistance - Post Trip (R1) (Max)	65 Ohms	65 Ohms	Identical
Operating Temperature	-20°C ~ 85°C	-20°C ~ 85°C	Identical
Mounting Type	Through Hole	Through Hole	Identical
Package / Case	Radial, Disc	Radial, Disc	Identical
Lead Spacing	0.200" (5.08mm)	0.200" (5.08mm)	Identical
Approval Agency	CQC, CSA, TUV, UL	CQC, CSA, TUV, UL	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Product Status	Obsolete	Active	Substitute is active

Engineering Selection Recommendations

The LVR005NK is the direct equivalent substitute for the obsolete LVR005K. Both components are manufactured by Littelfuse Inc. within the PolySwitch® LVR series and share identical electrical and mechanical specifications across all critical parameters.

The LVR005NK holds active product status, ensuring ongoing availability and manufacturing support. Both parts maintain equivalent regulatory certifications including CQC, CSA, TUV, and UL approvals, and both comply with ROHS3 requirements.

Physical dimensions differ slightly between the two parts (LVR005K: 0.327" Dia x 0.150" T versus LVR005NK: 0.272" Dia x 0.181" T), but both maintain the same 0.200" (5.08mm) lead spacing required for through-hole radial mounting. These dimensional variations do not affect electrical performance or circuit compatibility.

Frequently Asked Questions (FAQ)

Q: Can the LVR005NK be used as a direct replacement for the LVR005K?

A: Yes. The LVR005NK is electrically and functionally equivalent to the LVR005K across all specified parameters including voltage rating, current hold and trip specifications, resistance values, and operating temperature range. Both components are manufactured by Littelfuse Inc. in the PolySwitch® LVR series.

Q: What is the primary difference between these two parts?

A: The LVR005K is obsolete while the LVR005NK maintains active product status. The LVR005NK also differs in physical dimensions and packaging format (bag versus unspecified for the main part), but these differences do not affect electrical compatibility or circuit performance.

Q: Are the lead spacings identical?

A: Yes. Both the LVR005K and LVR005NK maintain a lead spacing of 0.200" (5.08mm), ensuring compatibility with existing through-hole PCB layouts designed for either component.

Q: Do both parts carry the same regulatory certifications?

A: Yes. Both the LVR005K and LVR005NK are certified by CQC, CSA, TUV, and UL, and both comply with ROHS3 requirements.

Q: What is the hold current specification for this component?

A: The hold current (Ih) maximum is 50 mA for both the LVR005K and LVR005NK.

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