TMOV20R320M Equivalent & Substitute Parts

Part Overview

The TMOV20R320M is a 510 V, 10 kA varistor manufactured by Littelfuse Inc. in the iTMOV® series. This transient voltage suppressor is designed for through-hole mounting in disc configuration with 20mm diameter and 3-lead termination. The part is classified as obsolete, making identification of suitable substitutes essential for ongoing system support and new design implementations.

Substiute Parts

TMOV20R320M

Littelfuse Inc.In Stock: 1002TMOV20R320M Datasheet

Current PartRFQ

TMOV20RP320M

Littelfuse Inc.In Stock: 2942TMOV20RP320M Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TMOV20R320M is determined by strict equivalence across the following electrical and mechanical parameters:

• Varistor voltage rating (510 V nominal, 459–561 V range)
• Surge current capacity (10 kA)
• Energy absorption (270 J)
• Mounting configuration (through-hole, disc 20mm, 3-lead)
• Operating temperature range (-55°C to 85°C)
• Single-circuit configuration
• Thermal protection feature

The TMOV20RP320M meets all these criteria and is therefore a direct functional equivalent. The primary distinction between the main part and its substitute is product status and compliance certification, not electrical or mechanical performance.

Parameter Comparison

Engineering Selection Recommendations

The TMOV20RP320M is the direct substitute for the TMOV20R320M. Both parts are manufactured by Littelfuse Inc. within the iTMOV® series and share identical electrical and mechanical specifications.

Selection between these parts is determined by regulatory and compliance requirements:

• For applications requiring RoHS3 compliance, the TMOV20RP320M is the appropriate choice.
• For legacy systems or applications without RoHS compliance mandates, either part meets the functional requirements.
• The TMOV20RP320M carries active product status, ensuring continued availability and supply chain support.
• The TMOV20R320M is obsolete and subject to inventory depletion.

Both parts are suitable for direct pin-for-pin replacement in existing circuit designs without modification to PCB layout or electrical schematic.

Frequently Asked Questions (FAQ)

Q: Can the TMOV20RP320M replace the TMOV20R320M in existing designs?

A: Yes. The TMOV20RP320M is electrically and mechanically identical to the TMOV20R320M. Both parts have the same varistor voltage rating (510 V), surge current capacity (10 kA), energy absorption (270 J), and through-hole disc 20mm 3-lead package configuration. Direct substitution requires no circuit or PCB modifications.

Q: What is the difference between TMOV20R320M and TMOV20RP320M?

A: The primary differences are product status and RoHS compliance. The TMOV20R320M is obsolete and RoHS non-compliant. The TMOV20RP320M is active and ROHS3 compliant. All electrical and mechanical parameters are identical.

Q: Why is the TMOV20R320M listed as obsolete?

A: Obsolescence indicates that the manufacturer has discontinued active production and support for this part number. The TMOV20RP320M represents the current production equivalent within the iTMOV® series.

Q: Are there any package or mounting differences between these parts?

A: No. Both parts use identical through-hole mounting with disc 20mm 3-lead configuration. PCB footprints and lead spacing are equivalent.

Q: Which part should be selected for new designs?

A: The TMOV20RP320M should be selected for new designs. It is the active product with current manufacturing support and RoHS3 compliance certification.

Q: Can these parts be used interchangeably in the same circuit?

A: Yes. The TMOV20RP320M and TMOV20R320M are direct functional equivalents with identical electrical performance and mechanical compatibility.