V751CA40 Equivalent & Substitute Parts

Part Overview

The V751CA40 is a 1.2 kV, 40 kA Transient Voltage Suppressor (TVS) varistor manufactured by Littelfuse Inc. in a surface mount disc configuration (40mm). This component is designed for transient overvoltage protection in single-circuit applications with an operating temperature range of -55°C to 85°C.

The V751CA40 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades.

Substiute Parts

V751CA40

Littelfuse Inc.In Stock: 887V751CA40 Datasheet

Current PartRFQ

V751HC40

Littelfuse Inc.In Stock: 893V751HC40 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the V751CA40 is determined by the following electrical and mechanical parameters:

• Varistor voltage range: 1.08 kV (Min) to 1.32 kV (Max)
• Surge current capacity: 40 kA minimum
• Energy dissipation: 1050 J
• Maximum AC voltage rating: 750 V
• Maximum DC voltage rating: 970 V
• Operating temperature range: -55°C to 85°C
• Number of circuits: 1
• Capacitance @ 1 MHz: 1800 pF
• Package form factor: Disc 40mm
• RoHS compliance: ROHS3 Compliant

The V751HC40 meets all electrical specifications and maintains the same disc 40mm form factor. The primary difference is the mounting configuration: the V751CA40 uses surface mount, while the V751HC40 uses bolt mount with formed tabs. This distinction affects circuit board integration but does not alter electrical performance or protection characteristics.

Parameter Comparison

Engineering Selection Recommendations

The V751HC40 is the manufacturer-recommended substitute for the obsolete V751CA40. Both components are manufactured by Littelfuse Inc. and maintain identical electrical specifications across all critical parameters: varistor voltage, surge current capacity, energy dissipation, voltage ratings, and operating temperature range.

The V751HC40 carries active product status, ensuring ongoing availability and manufacturing support. Both parts maintain ROHS3 compliance, satisfying environmental and regulatory requirements.

The primary consideration for component selection is the mounting interface. The V751CA40 is configured for surface mount integration, while the V751HC40 requires bolt mount attachment with formed tabs. Circuit board design and mechanical assembly procedures must accommodate this mounting difference. Electrical performance and protection characteristics remain equivalent between the two parts.

Frequently Asked Questions (FAQ)

Q: Can the V751HC40 directly replace the V751CA40 in existing designs?

A: The V751HC40 provides electrical equivalence to the V751CA40 across all specified parameters. However, the mounting configuration differs: V751CA40 uses surface mount, while V751HC40 uses bolt mount with formed tabs. Circuit board layout and mechanical assembly must be adapted to accommodate the bolt mount interface.

Q: Are the electrical protection characteristics identical between V751CA40 and V751HC40?

A: Yes. Both components share identical varistor voltage (1.2 kV typical), surge current capacity (40 kA), energy dissipation (1050 J), voltage ratings, and operating temperature range. Protection performance is equivalent.

Q: Why is the V751CA40 listed as obsolete?

A: The V751CA40 has been discontinued by Littelfuse Inc. The V751HC40 remains in active production and serves as the current equivalent offering.

Q: What are the compliance differences between these parts?

A: Both the V751CA40 and V751HC40 are ROHS3 compliant. The V751HC40 additionally carries REACH Unaffected status. Both parts share the same ECCN (EAR99) and HTSUS (8533.40.4000) classifications.

Q: Does the mounting type affect the electrical performance?

A: No. The mounting configuration (surface mount versus bolt mount) is a mechanical interface consideration only. Electrical specifications, protection characteristics, and performance parameters remain identical.