V421CA32 Equivalent & Substitute Parts

Part Overview

The V421CA32 is a 680 V, 25 kA Varistor manufactured by Littelfuse Inc., designed for transient voltage suppression applications. This surface mount disc varistor (32mm) provides single-circuit protection with 400 J energy rating and operates across -55°C to 85°C. The V421CA32 is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

V421CA32

Littelfuse Inc.In Stock: 887V421CA32 Datasheet

Current PartRFQ

V421HA32

Littelfuse Inc.In Stock: 796V421HA32 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the V421CA32 is determined by strict equivalence across the following electrical and mechanical parameters:

• Varistor voltage range (Min/Typ/Max): 612 V / 680 V / 748 V
• Surge current capacity: 25 kA
• Energy dissipation: 400 J
• AC/DC voltage ratings: 420 V AC / 560 V DC
• Operating temperature: -55°C to 85°C
• Physical form factor: Disc 32mm
• Single-circuit configuration
• RoHS3 compliance

The V421HA32 meets all electrical specifications and maintains the same disc 32mm form factor. The primary difference is the mounting method: the V421CA32 uses surface mount technology, while the V421HA32 employs bolt mount with formed tabs. This distinction affects board integration but does not alter electrical performance or protection characteristics.

Parameter Comparison

Engineering Selection Recommendations

The V421HA32 is the manufacturer-recommended substitute for the obsolete V421CA32. Both components deliver identical electrical performance across all critical transient voltage suppression parameters. Selection between these parts depends on mechanical integration requirements:

Use the V421HA32 when board design accommodates bolt mount attachment with formed tabs. This active-status component ensures long-term supply chain availability and maintains full compliance with ROHS3 standards. The V421HA32 is suitable for applications requiring direct replacement of the V421CA32 where mounting method can be adapted to bolt mount configuration.

Frequently Asked Questions (FAQ)

Q: Can the V421HA32 directly replace the V421CA32 in existing designs?

A: Electrical substitution is complete. The V421HA32 matches all voltage, current, energy, and temperature specifications. Mechanical integration differs: the V421CA32 is surface mount while the V421HA32 is bolt mount with formed tabs. Board layout modification is required to accommodate the different mounting method.

Q: What is the significance of the V421CA32 being obsolete?

A: Obsolete status indicates the manufacturer no longer produces this component. The V421HA32, classified as active, ensures continued availability for new procurements and system support. Substitution is necessary for long-term supply chain reliability.

Q: Are there electrical performance differences between the two parts?

A: No. Both components share identical varistor voltage (680 V typical), surge current (25 kA), energy rating (400 J), and operating temperature range (-55°C to 85°C). Electrical protection characteristics are equivalent.

Q: What does the mounting type difference mean for component selection?

A: The V421CA32 uses surface mount technology for PCB integration. The V421HA32 uses bolt mount with formed tabs, requiring mechanical fastening to the board or chassis. This affects physical layout and assembly method but not electrical function.

Q: Are both parts RoHS compliant?

A: Yes. Both the V421CA32 and V421HA32 are ROHS3 compliant, meeting environmental and material restriction requirements.