TMOV34S421M Equivalent & Substitute Parts

Part Overview

The TMOV34S421M is a 680 V, 40 kA transient voltage suppressor (TVS) varistor manufactured by Littelfuse, designed for through-hole mounting in square 34mm package format with formed tabs and 3-lead configuration. This component is classified as obsolete, which necessitates identification of active equivalent alternatives to maintain design continuity and ensure supply chain availability for new production and field replacements.

Substiute Parts

TMOV34S421M

LittelfuseIn Stock: 1005TMOV34S421M Datasheet

Current PartRFQ

TMOV34S421MP

Littelfuse Inc.In Stock: 1143TMOV34S421MP Datasheet

DirectRFQ

TMOV34S421MPX2696

Littelfuse Inc.In Stock: 982TMOV34S421MPX2696 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TMOV34S421M is determined by strict equivalence across all electrical and mechanical parameters. The substitute parts identified maintain identical specifications for varistor voltage (680 V typical), surge current rating (40 kA), maximum AC/DC voltage ratings, energy dissipation capacity (910 J), operating temperature range (-55°C to 85°C), capacitance characteristics (3000 pF @ 1 MHz), and physical package format (square 34mm, formed tabs, 3-lead through-hole configuration).

The key parameters governing substitution are:

• Varistor voltage range (612 V minimum to 748 V maximum)
• Surge current capacity (40 kA)
• Energy rating (910 J)
• Package geometry and lead configuration (square 34mm, 3-lead)
• Mounting technology (through-hole)

Parameter Comparison

Engineering Selection Recommendations

Both TMOV34S421MP and TMOV34S421MPX2696 are direct functional equivalents to the obsolete TMOV34S421M, with identical electrical and mechanical specifications across all critical parameters. The primary distinction between these substitutes and the original part is product status: both alternatives are active components with current manufacturing support.

For new designs and production applications, either TMOV34S421MP or TMOV34S421MPX2696 is suitable. Both substitute parts achieve ROHS3 compliance, whereas the original TMOV34S421M is RoHS non-compliant. This compliance improvement may be advantageous for applications subject to environmental regulations or customer requirements.

Selection between the two active alternatives should be based on packaging format (both specified as Bulk) and inventory availability, as all other parameters remain identical.

Frequently Asked Questions (FAQ)

Q: Can TMOV34S421MP or TMOV34S421MPX2696 be used as direct replacements for TMOV34S421M?

A: Yes. Both parts maintain identical electrical specifications (680 V typical varistor voltage, 40 kA surge current, 910 J energy rating) and mechanical configuration (square 34mm package, formed tabs, 3-lead through-hole mounting). All critical parameters for circuit function and board compatibility are equivalent.

Q: What is the difference between TMOV34S421MP and TMOV34S421MPX2696?

A: Both parts are parametrically identical across all electrical and mechanical specifications. The difference in part number designation reflects internal Littelfuse manufacturing or distribution tracking. Both are active products with ROHS3 compliance and equivalent performance characteristics.

Q: Why is the original TMOV34S421M obsolete?

A: The TMOV34S421M is classified as obsolete by the manufacturer. The active alternatives TMOV34S421MP and TMOV34S421MPX2696 provide continued access to this varistor specification with improved regulatory compliance (ROHS3).

Q: Are there any package or lead configuration differences between the main part and substitutes?

A: No. All three parts share identical package geometry (square 34mm), lead configuration (formed tabs, 3-lead), and mounting technology (through-hole). Direct board-level substitution is supported without layout modifications.

Q: What compliance certifications apply to the substitute parts?

A: Both TMOV34S421MP and TMOV34S421MPX2696 are ROHS3 compliant and REACH unaffected. Both carry EAR99 export classification and HTSUS code 8533.40.4000. Moisture sensitivity level is 1 (unlimited), indicating no special storage or handling requirements.