V271CA40 Equivalent & Substitute Parts

Part Overview

The V271CA40 is a 430 V, 40 kA Varistor manufactured by Littelfuse Inc., designed for transient voltage suppression applications. This component features a surface mount disc configuration with 40mm diameter and is rated for 400J energy dissipation. The V271CA40 is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

V271CA40

Littelfuse Inc.In Stock: 845V271CA40 Datasheet

Current PartRFQ

V271HC40

Littelfuse Inc.In Stock: 1087V271HC40 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the V271CA40 is determined by electrical and mechanical parameter equivalence within the Littelfuse CA and HC series varistors. The primary substitution candidate maintains identical electrical specifications: 430 V typical varistor voltage, 40 kA surge current rating, and 400 J energy dissipation. The key differentiator between the main part and its substitute is the mounting configuration. The V271CA40 employs surface mount technology, while the substitute utilizes bolt mount with formed tabs. Both components share the same disc 40mm package geometry, operating temperature range (-55°C to 85°C), and voltage ratings (275 V AC maximum, 369 V DC maximum). Substitution is valid when the application permits transition from surface mount to bolt mount mechanical interfaces.

Parameter Comparison

Engineering Selection Recommendations

The V271HC40 serves as the primary substitute for the obsolete V271CA40. Both components are manufactured by Littelfuse Inc. and maintain identical electrical performance across all critical parameters: varistor voltage range (387 V to 473 V), surge current capacity (40 kA), and energy dissipation (400 J). Both components comply with ROHS3 standards and carry EAR99 export classification.

The V271HC40 is classified as active product status, ensuring continued availability and manufacturing support. The transition from surface mount (V271CA40) to bolt mount with formed tabs (V271HC40) requires mechanical redesign of the mounting interface but does not affect electrical performance or thermal characteristics. Both components operate across the identical temperature range (-55°C to 85°C) and maintain equivalent moisture sensitivity ratings (MSL 1).

Selection of the V271HC40 is appropriate for applications where bolt mount mechanical integration is feasible and where the active product status provides supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the V271HC40 directly replace the V271CA40 without circuit modification?

A: Electrical substitution is valid. The V271HC40 maintains identical varistor voltage (430 V typical), surge current rating (40 kA), and energy dissipation (400 J). Mechanical redesign of the mounting interface is required due to the transition from surface mount to bolt mount configuration.

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

A: The V271CA40 uses surface mount technology, while the V271HC40 employs bolt mount with formed tabs. Both share the same disc 40mm package geometry and identical electrical specifications.

Q: Are there compliance or certification differences between the V271CA40 and V271HC40?

A: Both components are ROHS3 compliant, carry MSL 1 (Unlimited) moisture sensitivity rating, and share identical ECCN (EAR99) and HTSUS (8533.40.4000) classifications.

Q: Why is the V271CA40 listed as obsolete?

A: The V271CA40 has been discontinued by Littelfuse Inc. The V271HC40 represents the active product line continuation with equivalent electrical performance.

Q: Are the voltage and current ratings identical between these parts?

A: Yes. Both components are rated for 430 V typical varistor voltage, 40 kA surge current, 275 V maximum AC, and 369 V maximum DC. Varistor voltage tolerance ranges from 387 V (minimum) to 473 V (maximum) for both parts.