LVR040S-2 Equivalent & Substitute Parts

Part Overview

The LVR040S-2 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., designed for overcurrent protection in 240V applications. This through-hole radial component provides automatic reset functionality with a 400 mA hold current and 900 mA trip current. The part is active in production with 1450 units currently in stock. Substitute parts are identified to address supply chain requirements, inventory availability, or specific application certifications.

Substiute Parts

LVR040S-2

Littelfuse Inc.In Stock: 1508LVR040S-2 Datasheet

Current PartRFQ

0ZRE0040FF2B

Bel Fuse Inc.In Stock: 40700ZRE0040FF2B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LVR040S-2 is determined by strict equivalence across the following critical parameters:

Voltage rating (240V maximum), current hold specification (400 mA), current trip specification (900 mA), initial resistance (600 mOhms minimum), post-trip resistance (1.9 Ohms maximum), mounting type (through hole), package configuration (radial disc), physical dimensions (0.453" L x 0.150" W), and lead spacing (0.200" nominal).

The substitute part 0ZRE0040FF2B meets all core electrical and mechanical requirements. Variations in maximum current capacity (7 A vs. 5.5 A), operating temperature range (-40°C ~ 85°C vs. -20°C ~ 85°C), lead spacing tolerance (0.201" vs. 0.200"), and certification profiles do not affect functional substitution within the specified application parameters.

Parameter Comparison

Engineering Selection Recommendations

Both the LVR040S-2 and 0ZRE0040FF2B are active production components with ROHS3 compliance. The LVR040S-2 carries broader certification coverage (CQC, CSA, TUV, UL), while the 0ZRE0040FF2B includes AEC-Q200 automotive qualification and cURus certification. Selection between these parts should be based on specific application certification requirements and supply chain availability. The 0ZRE0040FF2B offers extended low-temperature operation (-40°C minimum) compared to the LVR040S-2 (-20°C minimum), which may be relevant for certain environmental conditions.

Frequently Asked Questions (FAQ)

Q: Can the 0ZRE0040FF2B directly replace the LVR040S-2 in existing designs?

A: Yes, the 0ZRE0040FF2B meets all critical electrical and mechanical specifications for direct substitution. Both components share identical voltage rating (240V), hold current (400 mA), trip current (900 mA), resistance characteristics, and physical dimensions. Lead spacing tolerance (0.201" vs. 0.200") is within acceptable PCB layout margins for through-hole radial components.

Q: What are the differences in certification between these parts?

A: The LVR040S-2 is certified by CQC, CSA, TUV, and UL. The 0ZRE0040FF2B is certified by cURus and TUV, with additional AEC-Q200 automotive qualification. Application-specific certification requirements should determine part selection.

Q: Does the extended operating temperature range of the 0ZRE0040FF2B affect compatibility?

A: No. The 0ZRE0040FF2B's extended low-temperature capability (-40°C vs. -20°C minimum) is a superset of the LVR040S-2 specification and does not affect compatibility. Both parts operate within the same upper temperature limit (85°C).

Q: Are there inventory considerations for these substitutes?

A: The 0ZRE0040FF2B has higher current inventory availability (4060 units vs. 1450 units for the LVR040S-2), which may influence supply chain decisions.

Q: How do the maximum current ratings differ, and does this affect substitution?

A: The LVR040S-2 specifies 5.5 A maximum current, while the 0ZRE0040FF2B specifies 7 A maximum current. Both parts trip at 900 mA, so the higher maximum rating of the substitute does not affect circuit protection behavior within the specified application parameters.