ROV20-201K Equivalent & Substitute Parts

Part Overview

The ROV20-201K is a 200 V, 6.5 kA Transient Voltage Suppressor (TVS) varistor manufactured by Littelfuse Inc. in a through-hole disc format (20mm). This component is designed for transient overvoltage protection in electronic circuits with a maximum DC voltage rating of 170 V and operating temperature range of -40°C to 125°C.

The ROV20-201K is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Substiute Parts

ROV20-201K

Littelfuse Inc.In Stock: 762ROV20-201K Datasheet

Current PartRFQ

ERZ-V20D201

Panasonic Electronic ComponentsIn Stock: 5647ERZ-V20D201 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ROV20-201K is determined by the following critical electrical and mechanical parameters:

• Varistor voltage rating (200 V nominal)
• Surge current capacity (minimum 6.5 kA)
• Maximum DC and AC voltage ratings (170 V DC, 130 V AC)
• Through-hole mounting configuration
• Disc package format (20mm or compatible size)
• Single-circuit configuration
• Operating temperature range compatibility

The ERZ-V20D201 qualifies as a substitute based on matching these core parameters within acceptable engineering tolerances for TVS varistor applications.

Parameter Comparison

Engineering Selection Recommendations

The ERZ-V20D201 (Panasonic ZNR® series) is an active product substitute for the obsolete ROV20-201K. Both components meet ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for new designs and replacements.

The ERZ-V20D201 provides enhanced surge current capacity (10 kA versus 6.5 kA) and higher energy rating (140 J versus 114 J), offering improved transient protection margins. The varistor voltage characteristics remain equivalent at 200 V nominal with comparable DC and AC voltage ratings.

Physical package dimensions differ slightly (21.5mm versus 20mm disc), requiring verification of PCB layout and mechanical clearance in the target application. The operating temperature range of the substitute extends to 85°C maximum, which is lower than the original part's 125°C rating; this must be evaluated against the thermal environment of the application.

Both parts are through-hole mounted single-circuit configurations suitable for direct functional replacement in TVS protection circuits.

Frequently Asked Questions (FAQ)

Q: Can the ERZ-V20D201 directly replace the ROV20-201K without circuit modification?

A: The ERZ-V20D201 matches the critical electrical parameters (200 V varistor voltage, 170 V DC maximum, 130 V AC maximum, single circuit). Physical package dimensions differ (21.5mm versus 20mm), requiring PCB layout verification. The higher surge current rating (10 kA) and energy capacity (140 J) provide enhanced protection margins.

Q: What is the significance of the higher surge current rating in the substitute part?

A: The ERZ-V20D201 surge current capacity of 10 kA exceeds the original 6.5 kA specification. This provides additional transient suppression capability and improved reliability margins in overvoltage events, with no negative impact on circuit performance.

Q: Are there temperature range limitations when substituting?

A: The ERZ-V20D201 operates to 85°C maximum, compared to the ROV20-201K's 125°C upper limit. Applications requiring sustained operation above 85°C ambient or junction temperature must evaluate thermal performance independently.

Q: How do the varistor voltage tolerances compare?

A: Both parts specify 200 V nominal varistor voltage. The ROV20-201K tolerance is 180–220 V; the ERZ-V20D201 tolerance is 185–225 V. The overlap range (185–220 V) ensures functional equivalence for circuit protection purposes.

Q: Does the package size difference affect electrical performance?

A: Package size (20mm versus 21.5mm disc) is a mechanical consideration affecting PCB layout and mounting. Electrical performance is determined by varistor voltage, surge current capacity, and energy rating, which are equivalent between the parts.

Q: What compliance certifications apply to both parts?

A: Both the ROV20-201K and ERZ-V20D201 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component use.