V571HC40 Equivalent & Substitute Parts

Part Overview

The V571HC40 is a 910 V, 40 kA transient voltage suppressor (TVS) varistor manufactured by Littelfuse in disc format with bolt mount configuration. This component is designed for surge protection applications requiring high energy dissipation in a compact 40mm form factor. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating, making it suitable for industrial and commercial protection circuits.

Substitute parts are identified when electrical performance parameters, mechanical compatibility, and regulatory compliance align with the original specification, enabling direct replacement in existing designs without circuit modification.

Substiute Parts

V571HC40

LittelfuseIn Stock: 724V571HC40 Datasheet

Current PartRFQ

V571HA40

Littelfuse Inc.In Stock: 1206V571HA40 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The V571HA40 qualifies as a parametric equivalent to the V571HC40 based on the following criteria:

Electrical Parameters Match:

• Varistor voltage range: 819 V (Min) to 1.001 kV (Max), with 910 V typical
• Surge current rating: 40 kA
• Energy dissipation: 770 J
• Maximum AC voltage: 575 V
• Maximum DC voltage: 730 V
• Capacitance: 2200 pF @ 1 MHz

Mechanical Compatibility:

• Identical package format: Disc 40mm with formed tabs
• Identical mounting type: Bolt mount
• Single circuit configuration

Regulatory & Environmental Compliance:

• RoHS3 compliant
• REACH unaffected
• Moisture sensitivity level 1 (unlimited)
• Operating temperature range: -55°C to 85°C
• ECCN and HTSUS classifications identical

The substitution is based strictly on matching electrical performance within specified tolerances and mechanical interchangeability in the same mounting configuration.

Parameter Comparison

Engineering Selection Recommendations

Both the V571HC40 and V571HA40 are active production components from Littelfuse with identical electrical specifications and mechanical form factors. Selection between these parts may be based on:

Availability: The V571HA40 currently has higher inventory (1182 pcs) compared to the V571HC40 (625 pcs), which may influence procurement decisions for high-volume applications.

Regulatory Compliance: Both parts meet identical compliance requirements including RoHS3, REACH unaffected status, and EAR99 export classification, ensuring no regulatory barriers to substitution.

Series Designation: The parts differ only in series designation (HC versus HA), which reflects internal Littelfuse product line organization but does not affect electrical or mechanical performance in the application.

Direct substitution is permissible where the V571HC40 is specified, provided the application circuit does not contain series-specific design constraints.

Frequently Asked Questions (FAQ)

Q: Can the V571HA40 be used as a direct replacement for the V571HC40?

A: Yes. All electrical parameters, mechanical dimensions, mounting configuration, and regulatory certifications are identical. Direct substitution in existing designs is permissible without circuit modification.

Q: What is the difference between the HC and HA series designations?

A: The series designation reflects Littelfuse internal product line organization. No functional or performance differences exist between these series for the specified 910 V, 40 kA varistor rating.

Q: Are the bolt mount configurations identical?

A: Yes. Both parts use identical bolt mount configuration with 40mm disc form factor and formed tabs, ensuring mechanical interchangeability in existing mounting assemblies.

Q: Do both parts meet the same environmental and compliance standards?

A: Yes. Both parts are RoHS3 compliant, REACH unaffected, have moisture sensitivity level 1 (unlimited), and share identical ECCN and HTSUS classifications.

Q: What is the operating temperature range for both parts?

A: Both the V571HC40 and V571HA40 operate across -55°C to 85°C ambient temperature range, with identical thermal performance characteristics.

Q: Are there any differences in energy dissipation capacity?

A: No. Both parts dissipate 770 J of energy at the 40 kA surge current rating, providing identical protection performance in transient suppression applications.

Q: Can these parts be used interchangeably in high-volume production?

A: Yes. Electrical and mechanical equivalence permits interchangeable use in production. Procurement may select either part based on availability and lead time considerations.