ROV20-431K-S Equivalent & Substitute Parts

Part Overview

The ROV20-431K-S is a 430 V, 6.5 kA disc varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole applications. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The part operates across a temperature range of -40°C to 125°C and is housed in a 20mm disc package. Substitute parts must maintain electrical equivalence across voltage ratings, surge current capacity, and thermal operating ranges while accommodating available packaging formats.

Substiute Parts

ROV20-431K-S

Littelfuse Inc.In Stock: 1144ROV20-431K-S Datasheet

Current PartRFQ

ERZ-V20R431

Panasonic Electronic ComponentsIn Stock: 3068ERZ-V20R431 Datasheet

MFR RecommendedRFQ

VDRS20W275BSE

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 961VDRS20W275BSE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ROV20-431K-S is determined by the following electrical and mechanical parameters:

• Varistor voltage rating (430 V nominal, 387 V minimum to 473 V maximum range)
• Surge current capacity (minimum 6.5 kA)
• Maximum AC and DC voltage ratings (275 V AC, 350 V DC)
• Single-circuit configuration
• Through-hole mounting type
• ROHS3 compliance and REACH unaffected status

Substitute parts may vary in disc diameter, capacitance, and upper operating temperature limits, provided all electrical parameters remain within specification. Parts with higher surge current ratings or energy absorption capacity are acceptable as they provide equivalent or enhanced performance.

Parameter Comparison

Engineering Selection Recommendations

Both ERZ-V20R431 and VDRS20W275BSE are electrically equivalent to the ROV20-431K-S across all critical voltage and current parameters. Selection between substitutes should be based on the following factors:

ERZ-V20R431 (Panasonic, Active Status): Offers 10 kA surge current capacity and 303 J energy absorption, exceeding the original specification. The ZNR® series designation indicates active product status with ongoing manufacturer support. Operating temperature range is limited to -40°C to 85°C, which may be restrictive for applications requiring the full -40°C to 125°C range of the original part.

VDRS20W275BSE (Vishay, Active Status): Maintains identical surge current (6.5 kA) and energy (264 J) specifications to the original part. The VDRS series is actively manufactured. Operating temperature range is -40°C to 85°C, matching the Panasonic limitation.

Both substitutes are ROHS3 compliant and REACH unaffected. Disc diameter increases (21.5mm and 22.50mm respectively) require verification of available board space in the target application.

Frequently Asked Questions (FAQ)

Q: Can ERZ-V20R431 be used as a direct replacement for ROV20-431K-S?

A: ERZ-V20R431 is electrically equivalent across all voltage and current parameters. The higher surge current rating (10 kA vs. 6.5 kA) and energy absorption (303 J vs. 264 J) provide equivalent or enhanced performance. The larger disc diameter (21.5mm vs. 20mm) requires board layout verification. The reduced upper operating temperature limit (-40°C to 85°C vs. -40°C to 125°C) must be evaluated against application requirements.

Q: What are the key differences between VDRS20W275BSE and the original ROV20-431K-S?

A: VDRS20W275BSE maintains identical electrical specifications for surge current and energy absorption. The primary differences are the larger disc diameter (22.50mm vs. 20mm) and reduced upper operating temperature limit (-40°C to 85°C vs. -40°C to 125°C). Electrical performance in the specified voltage and current ranges is equivalent.

Q: Are there any compliance or certification differences between the substitutes?

A: All three parts—ROV20-431K-S, ERZ-V20R431, and VDRS20W275BSE—are ROHS3 compliant and REACH unaffected. No compliance or certification differences exist among the three options.

Q: How do package size differences affect substitution?

A: The original ROV20-431K-S uses a 20mm disc package. ERZ-V20R431 uses a 21.5mm disc, and VDRS20W275BSE uses a 22.50mm disc. Physical board space must accommodate the larger diameter. Pin spacing and mounting hole positioning remain compatible with through-hole mounting standards.

Q: Which substitute should be selected for high-temperature applications?

A: Neither substitute extends the upper operating temperature limit beyond -40°C to 85°C. If the application requires operation above 85°C, alternative parts outside this substitute group must be evaluated, as both active substitutes have reduced temperature ratings compared to the obsolete original part.