V511CA40 Equivalent & Substitute Parts

Part Overview

The V511CA40 is a 820 V, 40 kA varistor manufactured by Littelfuse Inc., designed for transient voltage suppression applications. This surface mount disc component (40mm) provides single-circuit protection with 700 J energy rating and operates across -55°C to 85°C. The V511CA40 is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

V511CA40

Littelfuse Inc.In Stock: 788V511CA40 Datasheet

Current PartRFQ

V511HA40

Littelfuse Inc.In Stock: 803V511HA40 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the V511CA40 is determined by matching the following critical electrical and mechanical parameters:

• Varistor voltage range: 738 V (Min) to 902 V (Max)
• Surge current capacity: 40 kA minimum
• Energy dissipation: 700 J
• Single-circuit configuration
• Operating temperature: -55°C to 85°C
• Package form factor: Disc 40mm
• RoHS3 compliance

The V511HA40 qualifies as a direct substitute based on identical electrical specifications and package dimensions. The primary distinction is the mounting method: the V511CA40 uses surface mount technology, while the V511HA40 employs bolt mount with formed tabs. This difference permits substitution in applications where the mechanical mounting interface can be adapted.

Parameter Comparison

Engineering Selection Recommendations

The V511HA40 is the qualified substitute for the V511CA40 based on identical electrical performance specifications and regulatory compliance. Both components meet ROHS3 requirements and deliver equivalent transient voltage suppression performance across the specified operating range.

The V511CA40's obsolete status necessitates transition to the V511HA40 for new procurements and long-term system support. The V511HA40 maintains active product status with Littelfuse Inc., ensuring continued availability and supply chain stability.

The primary consideration for substitution is the mechanical mounting interface. The V511CA40 surface mount configuration differs from the V511HA40 bolt mount design. System integration requires mechanical redesign or adapter implementation to accommodate the formed tabs and bolt mount structure of the V511HA40.

Frequently Asked Questions (FAQ)

Q: Can the V511HA40 directly replace the V511CA40 without circuit modification?

A: Electrical substitution is direct; no circuit modifications are required. Mechanical mounting interface adaptation is necessary due to the transition from surface mount to bolt mount with formed tabs.

Q: Are the electrical performance characteristics identical between these parts?

A: Yes. Both components share identical varistor voltage ratings (738–902 V typical 820 V), surge current capacity (40 kA), energy dissipation (700 J), and operating temperature range (-55°C to 85°C).

Q: What is the significance of the V511CA40 being obsolete?

A: Obsolete status indicates the V511CA40 is no longer manufactured or supported by Littelfuse Inc. The V511HA40 is the active replacement, ensuring future availability and technical support.

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both the V511CA40 and V511HA40 are ROHS3 compliant and carry identical ECCN (EAR99) and HTSUS (8533.40.4000) classifications.

Q: What packaging differences exist between these components?

A: The V511CA40 is supplied in surface mount configuration, while the V511HA40 includes formed tabs for bolt mount assembly. Both maintain the 40mm disc form factor.

Q: Is the V511HA40 suitable for applications requiring the same voltage and current specifications?

A: Yes. Identical electrical specifications (820 V typical, 40 kA surge capacity, 700 J energy) make the V511HA40 functionally equivalent for transient voltage suppression applications matching the V511CA40 design parameters.