TMOV20R250M Equivalent & Substitute Parts

Part Overview

The TMOV20R250M is a 390 V, 10 kA varistor manufactured by Littelfuse Inc. in the iTMOV® series. This transient voltage suppressor is designed for single-circuit through-hole applications in a 20mm disc package with 3-lead configuration. The part is currently obsolete, making identification of suitable substitutes essential for ongoing system support and component procurement.

Substiute Parts

TMOV20R250M

Littelfuse Inc.In Stock: 995TMOV20R250M Datasheet

Current PartRFQ

TMOV20RP250M

Littelfuse Inc.In Stock: 4259TMOV20RP250M Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TMOV20R250M is determined by strict equivalence across the following critical parameters:

• Varistor Voltage Rating: Nominal 390 V with tolerance range 351 V – 429 V
• Surge Current Capacity: 10 kA minimum
• Energy Absorption: 170 J
• Mounting Configuration: Through-hole, disc 20mm, 3-lead package
• Thermal Protection: Required feature
• Operating Temperature: -55°C to 85°C
• Number of Circuits: Single circuit only

The TMOV20RP250M meets all these criteria and is classified as a direct manufacturer substitute. Both parts share identical electrical performance specifications and physical form factor, with the primary distinction being product status and packaging configuration.

Parameter Comparison

Engineering Selection Recommendations

The TMOV20RP250M is the direct substitute for the obsolete TMOV20R250M. Selection is based on the following factors:

Product Status: The TMOV20R250M is obsolete. The TMOV20RP250M is active and maintains full availability in production inventory (4170 pcs in stock versus 975 pcs for the obsolete part).

Regulatory Compliance: The TMOV20RP250M is ROHS3 compliant, whereas the original part is RoHS non-compliant. For applications subject to RoHS directives, the substitute part satisfies current regulatory requirements.

Electrical and Mechanical Equivalence: Both parts are electrically and mechanically identical across all specified parameters, including varistor voltage rating, surge current capacity, energy absorption, thermal protection, and package configuration.

Packaging: The TMOV20RP250M is supplied in bulk packaging, whereas the original part uses standard packaging. This distinction does not affect electrical performance or mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can TMOV20RP250M be used as a direct replacement for TMOV20R250M in existing designs?

A: Yes. Both parts are electrically and mechanically equivalent. The TMOV20RP250M maintains identical varistor voltage ratings (390 V nominal), surge current capacity (10 kA), energy absorption (170 J), operating temperature range (-55°C to 85°C), and physical form factor (20mm disc, 3-lead through-hole package).

Q: What is the primary reason to transition from TMOV20R250M to TMOV20RP250M?

A: The TMOV20R250M is obsolete and no longer in production. The TMOV20RP250M is the active equivalent from the same manufacturer and series, ensuring continued component availability and supply chain continuity.

Q: Are there compliance differences between these parts?

A: Yes. The TMOV20RP250M is ROHS3 compliant, while the TMOV20R250M is RoHS non-compliant. For applications requiring RoHS compliance, the TMOV20RP250M satisfies regulatory requirements.

Q: Do the parts differ in packaging configuration?

A: The TMOV20RP250M is supplied in bulk packaging, while the TMOV20R250M uses standard packaging. This is a supply and logistics distinction only and does not affect electrical performance or mechanical fit.

Q: Are the moisture sensitivity levels identical?

A: Yes. Both parts carry MSL rating 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: Can these parts be used interchangeably in PCB designs?

A: Yes. The identical through-hole package configuration (20mm disc, 3-lead) ensures mechanical and electrical interchangeability without design modifications.