LVR040K-1 Equivalent & Substitute Parts

Part Overview

The LVR040K-1 is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc. in the PolySwitch® LVR series. This component provides overcurrent protection at 240V (265V internal rating) with a 400 mA hold current and 900 mA trip current. The device is rated for through-hole radial mounting in a disc package configuration. The part is currently active in production with 977 units in stock. Alternative models are necessary to accommodate different packaging requirements, lead configurations, or inventory availability while maintaining identical electrical performance and mechanical compatibility.

Substiute Parts

LVR040K-1

Littelfuse Inc.In Stock: 1058LVR040K-1 Datasheet

Current PartRFQ

LVR040S

Littelfuse Inc.In Stock: 23995LVR040S Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The LVR040K-1 and LVR040S are direct electrical equivalents within the Littelfuse PolySwitch® LVR series. Substitution is valid based on the following criteria:

Electrical Parameters (Identical):

• Voltage rating: 240V (265V internal)
• Hold current (Ih): 400 mA
• Trip current (It): 900 mA
• Maximum current: 5.5 A
• Time to trip: 24 s
• Initial resistance: 600 mOhms (Min)
• Post-trip resistance: 1.9 Ohms (Max)
• Operating temperature: -20°C to 85°C

Mechanical Parameters (Identical):

• Mounting type: Through hole
• Package type: Radial, Disc
• Lead spacing: 0.200" (5.08mm)
• Physical dimensions: 0.453" L x 0.150" W (11.50mm x 3.80mm)

Compliance (Identical):

• Approval agencies: CQC, CSA, TUV, UL
• RoHS3 compliant
• ECCN: EAR99
• HTSUS: 8533.40.8070

The primary difference between these parts is packaging format (tape and reel versus bulk) and seated height tolerance, which do not affect electrical or functional performance.

Parameter Comparison

Engineering Selection Recommendations

Both LVR040K-1 and LVR040S are qualified substitutes for applications requiring a 240V, 400 mA polymeric PTC resettable fuse with through-hole radial mounting. Selection between these parts should be based on:

Packaging Format: LVR040K-1 is supplied in tape and reel packaging, while LVR040S is supplied in bulk packaging. Choose based on assembly process requirements and order quantity.

Inventory Availability: LVR040S has significantly higher stock availability (23,952 units) compared to LVR040K-1 (977 units), making it preferable for high-volume production or urgent requirements.

Seated Height Tolerance: LVR040K-1 has a maximum seated height of 0.823" (20.90mm), while LVR040S has a maximum seated height of 0.768" (19.50mm). Both dimensions are within acceptable mechanical tolerances for standard through-hole PCB applications. Verify clearance requirements for space-constrained designs.

Compliance: Both parts carry identical certifications (CQC, CSA, TUV, UL) and are ROHS3 compliant, ensuring regulatory compliance across all markets.

Frequently Asked Questions (FAQ)

Q: Can LVR040S be used as a direct replacement for LVR040K-1?

A: Yes. Both parts are electrically and mechanically identical across all critical parameters: voltage rating, current ratings, trip characteristics, resistance values, operating temperature range, mounting type, package configuration, and lead spacing. The only differences are packaging format and seated height tolerance, neither of which affects functional performance.

Q: What is the difference between tape and reel (LVR040K-1) and bulk (LVR040S) packaging?

A: Tape and reel packaging is used for automated assembly processes, while bulk packaging is used for manual assembly or lower-volume applications. The electrical and mechanical specifications of the component are identical regardless of packaging format.

Q: Does the seated height difference between LVR040K-1 (0.823") and LVR040S (0.768") affect PCB compatibility?

A: The seated height difference of 0.055" (1.40mm) is within standard mechanical tolerances for through-hole components. Both parts will fit standard PCB footprints designed for radial disc fuses with 0.200" lead spacing. Verify clearance in space-constrained applications.

Q: Are both parts RoHS compliant?

A: Yes. Both LVR040K-1 and LVR040S are ROHS3 compliant and carry identical regulatory certifications (CQC, CSA, TUV, UL).

Q: Which part should I select for high-volume production?

A: LVR040S is recommended for high-volume production due to significantly higher stock availability (23,952 units versus 977 units) and bulk packaging compatibility with automated assembly processes.