TMOV34S571M Equivalent & Substitute Parts

Part Overview

The TMOV34S571M is a 910 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, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued system support and new designs.

Substiute Parts

TMOV34S571M

Littelfuse Inc.In Stock: 809TMOV34S571M Datasheet

Current PartRFQ

TMOV34S571MP

Littelfuse Inc.In Stock: 752TMOV34S571MP Datasheet

DirectRFQ

TMOV34S571MPX2696

Littelfuse Inc.In Stock: 1224TMOV34S571MPX2696 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the TMOV34S571M is determined by strict equivalence across all critical electrical and mechanical parameters. The following criteria establish valid substitutes:

Electrical Parameters: Varistor voltage range (819 V minimum to 1.001 kV maximum), surge current rating (40 kA), maximum AC/DC voltage ratings (575 V AC, 730 V DC), energy absorption (990 J), and capacitance at 1 MHz (2200 pF) must remain identical.

Mechanical Parameters: Through-hole mounting type, square 34mm package with formed tabs and 3-lead configuration must be preserved.

Thermal Characteristics: Operating temperature range (-55°C to 85°C) and thermally protected feature must be maintained.

Circuit Configuration: Single-circuit design must be retained.

The identified substitutes meet all these criteria while offering improved product status and compliance certifications compared to the obsolete main part.

Parameter Comparison

Engineering Selection Recommendations

Both TMOV34S571MP and TMOV34S571MPX2696 are direct functional equivalents to the obsolete TMOV34S571M, with identical electrical, thermal, and mechanical specifications across all critical parameters.

Selection between the two active substitutes should be based on availability and supply chain requirements, as both parts maintain equivalent performance characteristics. TMOV34S571MP and TMOV34S571MPX2696 both carry Active product status and ROHS3 compliance, providing regulatory advantage over the obsolete main part. Both are supplied in bulk packaging and carry REACH Unaffected designation.

For new designs or system upgrades, either active substitute provides full compatibility with existing TMOV34S571M applications without circuit modification or re-qualification.

Frequently Asked Questions (FAQ)

Q: Can TMOV34S571MP or TMOV34S571MPX2696 be used as direct replacements for TMOV34S571M?

A: Yes. Both parts are parametric equivalents with identical varistor voltage (910 V typical), surge current rating (40 kA), voltage ratings, energy absorption, capacitance, operating temperature range, and package configuration. Direct substitution is supported without circuit changes.

Q: What is the difference between TMOV34S571MP and TMOV34S571MPX2696?

A: Both parts are electrically and mechanically identical. The difference is in the part number designation and internal tracking. Selection may be based on inventory availability or supplier preference.

Q: Why is the original TMOV34S571M listed as obsolete?

A: Product obsolescence is determined by the manufacturer. The active equivalents TMOV34S571MP and TMOV34S571MPX2696 provide continued access to this varistor specification with improved compliance status.

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

A: Yes. The TMOV34S571M is RoHS non-compliant, while both TMOV34S571MP and TMOV34S571MPX2696 are ROHS3 compliant and REACH Unaffected. This provides regulatory advantage for applications subject to environmental compliance requirements.

Q: Will the through-hole mounting and square 34mm package remain the same?

A: Yes. All three parts maintain identical through-hole mounting type and square 34mm package with formed tabs and 3-lead configuration, ensuring mechanical compatibility with existing PCB layouts.

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

A: All three parts operate across -55°C to 85°C, maintaining identical thermal performance specifications.