V751NA34 Equivalent & Substitute Parts

Part Overview

The V751NA34 is a 1.2 kV, 40 kA Transient Voltage Suppressor (TVS) varistor manufactured by Littelfuse Inc., designed for surface mount applications in a square 34mm package. This component is classified as obsolete, making identification of suitable substitutes essential for ongoing system support and new design implementations. The varistor provides transient voltage suppression across a single circuit with energy absorption capability of 1050J, suitable for protecting sensitive electronics from voltage spikes and transient events.

Substiute Parts

V751NA34

Littelfuse Inc.In Stock: 852V751NA34 Datasheet

Current PartRFQ

V751DHB34

Littelfuse Inc.In Stock: 1084V751DHB34 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the V751NA34 is determined by electrical and mechanical parameter equivalence. The primary substitution criteria are:

• Varistor voltage rating (minimum, typical, and maximum values must match: 1.08 kV to 1.32 kV range)
• Surge current capacity (40 kA minimum)
• Energy absorption capability (1050 J)
• Single circuit configuration
• Operating temperature range (-55°C to 85°C)
• Package form factor (Square 34mm)
• RoHS3 compliance and MSL rating

The V751DHB34 qualifies as a direct substitute based on identical electrical specifications and compliance certifications. The primary difference is the mounting technology: the V751NA34 uses surface mount technology, while the V751DHB34 employs through-hole mounting with tabs. This distinction affects PCB layout and assembly methodology but does not alter the electrical performance or protection characteristics.

Parameter Comparison

Engineering Selection Recommendations

The V751DHB34 is the designated manufacturer substitute for the obsolete V751NA34. Both components maintain identical electrical performance specifications, including varistor voltage rating, surge current capacity, and energy absorption characteristics. The V751DHB34 carries active product status, ensuring continued availability and manufacturing support from Littelfuse Inc.

Selection between these parts depends on PCB assembly requirements. The V751NA34 surface mount configuration is suitable for automated assembly processes and high-density layouts. The V751DHB34 through-hole variant with tabs accommodates manual assembly, rework operations, and applications requiring mechanical robustness through direct solder connections to PCB pads.

Both components satisfy ROHS3 compliance requirements and carry MSL rating 1, indicating no moisture sensitivity constraints during storage and handling. Electrical performance remains equivalent across the specified operating temperature range of -55°C to 85°C.

Frequently Asked Questions (FAQ)

Q: Can the V751DHB34 directly replace the V751NA34 in existing designs?

A: Electrical substitution is complete. PCB layout modification is required due to mounting technology differences. The V751NA34 uses surface mount pads, while the V751DHB34 requires through-hole footprint with tab connections. Design review and PCB rework are necessary.

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

A: Yes. Both components provide identical varistor voltage rating (1.2 kV typical), surge current capacity (40 kA), and energy absorption (1050 J). Protection performance is equivalent.

Q: What is the significance of the V751NA34 being obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The V751DHB34 remains in active production and is the recommended path for new designs and ongoing system support.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the V751NA34 and V751DHB34 are ROHS3 compliant with MSL rating 1. Compliance certifications are equivalent.

Q: What are the packaging differences between these parts?

A: The V751NA34 is supplied in surface mount configuration. The V751DHB34 is supplied in bulk packaging with through-hole tabs. Both maintain the square 34mm form factor.

Q: Can the V751DHB34 be used in automated assembly processes?

A: The V751DHB34 through-hole design is not optimized for automated surface mount assembly. It is suitable for manual assembly, wave soldering, or selective soldering processes.