TMOV34S321M Equivalent & Substitute Parts

Part Overview

The TMOV34S321M is a 510 V, 40 kA transient voltage suppressor (TVS) varistor manufactured by Littelfuse Inc. in the TMOV® 34S series. This component is designed for single-circuit overvoltage protection applications with a square 34mm form factor and through-hole mounting configuration. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing system support and new design implementations.

Substiute Parts

TMOV34S321M

Littelfuse Inc.In Stock: 1120TMOV34S321M Datasheet

Current PartRFQ

TMOV34S321MP

Littelfuse Inc.In Stock: 1165TMOV34S321MP Datasheet

DirectRFQ

TMOV34S321MPX2696

LittelfuseIn Stock: 1066TMOV34S321MPX2696 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the TMOV34S321M is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute parts identified maintain identical specifications for varistor voltage (510 V typical, 459–561 V range), surge current capacity (40 kA), energy rating (640 J), capacitance (3800 pF @ 1 MHz), operating temperature range (-55°C to 85°C), and physical form factor (square 34mm, through-hole, 3-lead configuration).

The primary distinction between the main part and substitutes is product status and compliance certification. TMOV34S321M is obsolete, while both substitute parts are active products with current manufacturing support. Additionally, the substitute parts carry ROHS3 compliance and REACH unaffected status, whereas the original part is RoHS non-compliant.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using TMOV34S321M, both TMOV34S321MP and TMOV34S321MPX2696 provide direct electrical and mechanical equivalence. Selection between the two active substitutes should be based on packaging requirements and supply chain availability, as both parts are functionally identical and carry identical compliance certifications.

TMOV34S321MP and TMOV34S321MPX2696 are preferred over the obsolete TMOV34S321M due to active product status, ensuring continued manufacturing support, availability, and compliance with current regulatory standards including ROHS3 and REACH requirements. Both substitute parts are suitable for direct replacement in existing designs without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can TMOV34S321MP and TMOV34S321MPX2696 be used interchangeably with TMOV34S321M?

A: Yes. Both substitute parts maintain identical electrical parameters (510 V varistor voltage, 40 kA surge current, 640 J energy rating) and mechanical specifications (square 34mm form factor, through-hole mounting, 3-lead configuration). Direct substitution is supported without circuit redesign.

Q: What is the primary difference between the substitute parts and the original TMOV34S321M?

A: The original part is obsolete with RoHS non-compliant status. Both substitute parts are active products with ROHS3 compliance and REACH unaffected certification, providing ongoing manufacturing support and regulatory alignment.

Q: Are there differences between TMOV34S321MP and TMOV34S321MPX2696?

A: Both parts are electrically and mechanically identical. The difference lies in packaging designation (both specified as Bulk). Selection should be based on supplier availability and internal part numbering conventions.

Q: What parameters determine substitution eligibility for this varistor?

A: Substitution is determined by equivalence in varistor voltage (510 V ±10%), surge current capacity (40 kA), energy rating (640 J), operating temperature range (-55°C to 85°C), and physical form factor (square 34mm, through-hole, 3-lead). All identified substitutes meet these criteria.

Q: Is the through-hole mounting configuration maintained across all parts?

A: Yes. TMOV34S321M, TMOV34S321MP, and TMOV34S321MPX2696 all use through-hole mounting with square 34mm, formed-tab, 3-lead packaging. PCB layout compatibility is maintained.