TMOV34S251M Equivalent & Substitute Parts

Part Overview

The TMOV34S251M is a 390 V, 40 kA varistor manufactured by Littelfuse Inc., designed for transient voltage suppression applications. This component features a square 34mm form factor with formed tabs and 3-lead through-hole mounting. The part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing system support and new design implementations.

Substiute Parts

TMOV34S251M

Littelfuse Inc.In Stock: 783TMOV34S251M Datasheet

Current PartRFQ

TMOV34S251MP

Littelfuse Inc.In Stock: 720TMOV34S251MP Datasheet

DirectRFQ

TMOV34S251MPX2696

Littelfuse Inc.In Stock: 743TMOV34S251MPX2696 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TMOV34S251M are identified based on electrical and mechanical parameter equivalence within the TMOV® 34S series. Substitution is valid when all critical parameters match exactly: varistor voltage range (351 V minimum to 429 V maximum), surge current rating (40 kA), energy dissipation (490 J), operating temperature range (-55°C to 85°C), and physical form factor (square 34mm with formed tabs, 3-lead through-hole configuration).

The substitute parts listed maintain identical electrical performance characteristics and mechanical compatibility, differing only in product status and regulatory compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Both TMOV34S251MP and TMOV34S251MPX2696 are direct functional equivalents to the obsolete TMOV34S251M, with identical electrical and mechanical specifications. Selection between these active alternatives should be based on regulatory compliance requirements and supply chain availability.

TMOV34S251MP and TMOV34S251MPX2696 are both ROHS3 compliant and carry REACH Unaffected status, making them suitable for applications requiring modern regulatory compliance. The original TMOV34S251M is RoHS non-compliant and should be replaced in new designs or system updates.

All three parts share identical performance characteristics: 390 V typical varistor voltage, 40 kA surge current capacity, 490 J energy dissipation, and -55°C to 85°C operating temperature range. Physical form factor and mounting configuration are identical across all variants.

Frequently Asked Questions (FAQ)

Q: Can TMOV34S251MP or TMOV34S251MPX2696 be used as direct replacements for TMOV34S251M?

A: Yes. Both substitute parts maintain identical electrical ratings (390 V varistor voltage, 40 kA surge current, 490 J energy) and mechanical form factor (square 34mm, formed tabs, 3-lead through-hole). The primary differences are product status (active versus obsolete) and regulatory compliance certifications.

Q: What is the difference between TMOV34S251MP and TMOV34S251MPX2696?

A: Both parts are electrically and mechanically identical with matching specifications across all critical parameters. The difference lies in packaging designation and internal tracking codes. Both are active products with ROHS3 compliance and REACH Unaffected status.

Q: Are there any compatibility concerns when substituting these parts?

A: No compatibility concerns exist. All three parts are from the same TMOV® 34S series with identical through-hole mounting configuration, pin spacing, and electrical performance. Direct board-level substitution is supported without circuit modifications.

Q: Why is the original TMOV34S251M marked as obsolete?

A: The TMOV34S251M is classified as obsolete due to its RoHS non-compliant status. Active alternatives (TMOV34S251MP and TMOV34S251MPX2696) provide equivalent functionality with modern regulatory compliance for new and ongoing applications.

Q: What parameters must match for substitution to be valid?

A: Critical matching parameters include varistor voltage range (351 V to 429 V), surge current rating (40 kA), energy dissipation (490 J), operating temperature range (-55°C to 85°C), and physical form factor (square 34mm, formed tabs, 3-lead through-hole). All substitute parts meet these requirements.