TMOV34S331M Equivalent & Substitute Parts

Part Overview

The TMOV34S331M is a 528.5 V, 40 kA varistor manufactured by Littelfuse Inc., designed for transient voltage suppression applications. This component features a square 34mm package with formed tabs and 3-lead configuration, suitable for through-hole mounting in industrial and power protection circuits.

The TMOV34S331M is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this varistor specification.

Substiute Parts

TMOV34S331M

Littelfuse Inc.In Stock: 953TMOV34S331M Datasheet

Current PartRFQ

TMOV34S331MP

Littelfuse Inc.In Stock: 887TMOV34S331MP Datasheet

DirectRFQ

TMOV34S331MPX2696

Littelfuse Inc.In Stock: 1091TMOV34S331MPX2696 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TMOV34S331M are identified based on electrical and mechanical parameter equivalence within the TMOV® 34S series. Substitution is valid when the following criteria are met:

• Varistor voltage range (minimum, typical, maximum) remains within 476 V to 581 V
• Surge current rating equals 40 kA
• Maximum AC and DC voltage ratings remain at 330 V and 435 V respectively
• Energy rating equals 650 J
• Capacitance at 1 MHz equals 3700 pF
• Operating temperature range spans -55°C to 85°C
• Package configuration remains Square 34mm with formed tabs and 3-lead through-hole mounting
• Thermally protected feature is maintained

Two substitute parts meet these criteria: TMOV34S331MP and TMOV34S331MPX2696. Both are active products within the same series and maintain full electrical and mechanical compatibility with the obsolete TMOV34S331M.

Parameter Comparison

Engineering Selection Recommendations

Both TMOV34S331MP and TMOV34S331MPX2696 are direct substitutes for the obsolete TMOV34S331M, with identical electrical and mechanical specifications. Selection between these two active alternatives should be based on the following factors:

Regulatory Compliance: Both substitute parts are ROHS3 compliant and REACH unaffected, providing improved environmental compliance compared to the original obsolete part.

Supply Availability: TMOV34S331MPX2696 maintains higher inventory (990 pcs) compared to TMOV34S331MP (798 pcs), which may influence procurement decisions for high-volume applications.

Packaging: TMOV34S331MP is supplied in bulk packaging, while TMOV34S331MPX2696 is also supplied in bulk packaging. Both maintain identical through-hole square 34mm package configuration.

For new designs or production transitions, either substitute part provides full functional and mechanical compatibility with existing TMOV34S331M applications without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can TMOV34S331MP and TMOV34S331MPX2696 be used interchangeably with TMOV34S331M?

A: Yes. Both substitute parts maintain identical electrical parameters (528.5 V typical varistor voltage, 40 kA surge current, 650 J energy rating) and mechanical configuration (square 34mm through-hole package with formed tabs). Direct substitution is valid without circuit redesign.

Q: What is the difference between TMOV34S331MP and TMOV34S331MPX2696?

A: Both parts are electrically and mechanically identical. The primary differences are product status (both active), inventory levels, and packaging designation. TMOV34S331MPX2696 carries a higher stock level (990 pcs vs. 798 pcs).

Q: Why is the original TMOV34S331M classified as obsolete?

A: The TMOV34S331M is obsolete, but active equivalent parts remain available within the TMOV® 34S series. The substitute parts TMOV34S331MP and TMOV34S331MPX2696 provide continued support for applications requiring this varistor specification.

Q: Are there any compliance differences between the original part and substitutes?

A: Yes. The original TMOV34S331M is RoHS non-compliant, while both substitute parts (TMOV34S331MP and TMOV34S331MPX2696) are ROHS3 compliant and REACH unaffected. This represents an improvement in environmental compliance for new procurements.

Q: Can these varistors be used in both AC and DC circuits?

A: Yes. All three parts (original and substitutes) are rated for maximum AC voltage of 330 V and maximum DC voltage of 435 V, supporting both AC and DC transient voltage suppression applications within these voltage limits.

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

A: The operating temperature range for TMOV34S331M and both substitute parts is -55°C to 85°C (TA). This range applies to all three parts without variation.