V481CA40 Equivalent & Substitute Parts

Part Overview

The V481CA40 is a 750 V, 40 kA Transient Voltage Suppressor (TVS) varistor manufactured by Littelfuse Inc. in a surface mount disc configuration (40mm). This component is classified as obsolete, making identification of suitable substitutes essential for ongoing system support and new design implementations. The part operates within a maximum AC voltage of 480 V and maximum DC voltage of 640 V, with a typical varistor voltage of 750 V and energy rating of 650 J.

Substiute Parts

V481CA40

Littelfuse Inc.In Stock: 1042V481CA40 Datasheet

Current PartRFQ

V481HC40

Littelfuse Inc.In Stock: 1043V481HC40 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the V481CA40 is determined by electrical and mechanical parameter alignment within the Littelfuse varistor product line. The critical substitution criteria are:

• Varistor voltage range (675 V minimum to 825 V maximum)
• Surge current capacity (40 kA)
• Energy dissipation rating (650 J)
• Disc package form factor (40mm)
• Single circuit configuration
• RoHS3 compliance and moisture sensitivity level (MSL 1)

The V481HC40 qualifies as a direct substitute based on identical electrical performance specifications. The primary distinction lies in mounting methodology: the V481CA40 uses surface mount configuration, while the V481HC40 employs bolt mount with formed tabs. Both parts maintain equivalent voltage suppression characteristics, surge current handling, and energy ratings.

Parameter Comparison

Engineering Selection Recommendations

The V481HC40 is the qualified substitute for the obsolete V481CA40 based on electrical parameter equivalence and active product status. Both parts deliver identical voltage suppression performance (750 V typical), surge current capacity (40 kA), and energy dissipation (650 J) within the same 40mm disc package form factor.

Selection between these parts depends on circuit board integration requirements. The V481CA40 surface mount configuration suits PCB-mounted applications, while the V481HC40 bolt mount design with formed tabs accommodates direct panel or chassis mounting with mechanical fastening. Both parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring compatibility with standard manufacturing and storage protocols.

The transition from the obsolete V481CA40 to the active V481HC40 requires evaluation of the mechanical mounting interface within the target application. Electrical performance remains unchanged across both configurations.

Frequently Asked Questions (FAQ)

Q: Can the V481HC40 directly replace the V481CA40 in existing designs?

A: Electrical substitution is valid; both parts deliver identical voltage suppression and surge current performance. Mechanical compatibility depends on the mounting interface. Surface mount applications require redesign to accommodate the V481HC40 bolt mount configuration with formed tabs.

Q: What are the key electrical parameters that define substitution eligibility?

A: Varistor voltage range (675–825 V), surge current capacity (40 kA), energy rating (650 J), and single circuit configuration determine substitution validity. Both parts meet these criteria.

Q: Why is the V481CA40 classified as obsolete?

A: Product status reflects Littelfuse manufacturing decisions. The V481HC40 remains active and provides equivalent electrical performance for new designs and legacy system support.

Q: Are there compliance differences between the two parts?

A: Both parts are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity level). No compliance barriers exist for substitution.

Q: What mounting considerations apply to the V481HC40?

A: The V481HC40 uses bolt mount with formed tabs, requiring mechanical fastening to a panel or chassis. This differs from the V481CA40 surface mount approach and necessitates circuit board or enclosure redesign.