V321CA32 Equivalent & Substitute Parts

Part Overview

The V321CA32 is a 510 V, 20 kA Transient Voltage Suppressor (TVS) varistor manufactured by Littelfuse Inc. in a surface mount disc configuration (32mm). This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement planning. The varistor provides transient voltage suppression across a single circuit with energy absorption capability of 390 J.

Substiute Parts

V321CA32

Littelfuse Inc.In Stock: 759V321CA32 Datasheet

Current PartRFQ

V321HA32

Littelfuse Inc.In Stock: 998V321HA32 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the V321CA32 is determined by the following critical parameters that must remain consistent:

• Varistor Voltage (Typ): 510 V
• Maximum AC Volts: 320 V
• Maximum DC Volts: 420 V
• Number of Circuits: 1
• Energy Absorption: 390 J
• Package / Case: Disc 32mm
• RoHS Status: ROHS3 Compliant

The V321HA32 qualifies as a manufacturer-recommended substitute. While it maintains identical voltage ratings, energy absorption, and package geometry, it differs in mounting configuration (bolt mount versus surface mount) and surge current capacity (25 kA versus 20 kA). These differences represent functional enhancements rather than incompatibilities, as the substitute meets or exceeds the electrical performance envelope of the original part.

Parameter Comparison

Engineering Selection Recommendations

The V321HA32 is the manufacturer-recommended substitute for the obsolete V321CA32. Selection of this substitute is supported by the following factors:

• Electrical Equivalence: All critical voltage parameters (maximum AC/DC volts, varistor voltage range) are identical between the two parts.
• Energy Absorption: Both parts provide 390 J energy absorption capacity, maintaining equivalent transient suppression performance.
• Compliance: The V321HA32 maintains ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility.
• Product Status: The V321HA32 is active in production, providing long-term availability and supply chain stability compared to the obsolete V321CA32.
• Enhanced Performance: The V321HA32 offers increased surge current capacity (25 kA versus 20 kA), providing additional margin in transient suppression applications.

The primary design consideration is the transition from surface mount to bolt mount configuration. This change requires mechanical redesign of the mounting interface but does not affect electrical performance or functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can the V321HA32 directly replace the V321CA32 without circuit modification?

A: Electrical substitution is direct; all voltage ratings and energy absorption parameters are identical. Mechanical redesign of the mounting interface is required due to the change from surface mount to bolt mount configuration.

Q: What is the significance of the increased surge current rating (25 kA vs. 20 kA)?

A: The V321HA32 provides higher surge current capacity, which represents enhanced performance margin. This does not create incompatibility; it allows the substitute to handle transient events with greater headroom.

Q: Are there any compliance or certification differences between these parts?

A: Both parts are ROHS3 compliant with MSL 1 rating. No compliance gaps exist between the original and substitute part.

Q: Why is the V321CA32 listed as obsolete?

A: The V321CA32 has been discontinued by the manufacturer. The V321HA32 represents the active production alternative with equivalent electrical specifications.

Q: Does the package geometry remain compatible?

A: Both parts use a 32mm disc package. The V321HA32 includes formed tabs for bolt mount attachment, which is the primary mechanical difference from the surface mount configuration of the V321CA32.