ROV20-182K Equivalent & Substitute Parts

Part Overview

The ROV20-182K is a 1.8 kV, 6.5 kA varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole disc applications with a 20mm package footprint. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The varistor operates across a temperature range of -40°C to 125°C and is ROHS3 compliant.

Substiute Parts

ROV20-182K

Littelfuse Inc.In Stock: 818ROV20-182K Datasheet

Current PartRFQ

ERZ-V20D182

Panasonic Electronic ComponentsIn Stock: 1899ERZ-V20D182 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ROV20-182K is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Varistor voltage (typical): 1.8 kV nominal
• Varistor voltage range: 1.7 kV to 1.98 kV (minimum to maximum)
• Maximum DC voltage rating: 1.465 kV
• Maximum AC voltage rating: 1 kV
• Current surge capacity: minimum 6.5 kA
• Capacitance: approximately 250–260 pF @ 1 kHz

Mechanical Compatibility Criteria:

• Mounting type: Through Hole
• Package form: Disc configuration
• Number of circuits: 1

Compliance Requirements:

• RoHS3 compliance
• Operating temperature range: -40°C to 85°C minimum (note: original part rated to 125°C)

The ERZ-V20D182 meets all electrical and mechanical substitution criteria with improved surge current capacity (7.5 kA vs. 6.5 kA) and comparable energy rating (720 J vs. 695 J).

Parameter Comparison

Engineering Selection Recommendations

The ERZ-V20D182 is the manufacturer-recommended substitute for the ROV20-182K. Both components maintain ROHS3 compliance and REACH unaffected status. The substitute part is currently in active production status with 1845 units in stock, compared to the obsolete ROV20-182K with limited remaining inventory of 799 units.

The ERZ-V20D182 provides enhanced surge current capacity (7.5 kA vs. 6.5 kA) and marginally higher energy rating (720 J vs. 695 J), making it suitable for applications requiring equal or greater transient protection. The operating temperature range of the substitute extends to 85°C, which covers most industrial applications; however, designs requiring operation above 85°C should be evaluated for thermal management or alternative solutions.

The package footprint increases from 20mm to 24.6mm disc diameter. PCB layout modifications may be necessary to accommodate this dimensional change.

Frequently Asked Questions (FAQ)

Q: Can the ERZ-V20D182 be used as a direct replacement for the ROV20-182K?

A: The ERZ-V20D182 is electrically compatible as a substitute. Both components share identical nominal varistor voltage (1.8 kV), maximum DC voltage rating (1.465 kV), and maximum AC voltage rating (1 kV). The substitute offers improved surge current capacity. However, the package diameter increases from 20mm to 24.6mm, requiring PCB layout verification.

Q: What are the key differences between these two varistors?

A: The primary differences are: (1) surge current capacity—ERZ-V20D182 rated at 7.5 kA versus ROV20-182K at 6.5 kA; (2) energy dissipation—720 J versus 695 J; (3) operating temperature maximum—85°C versus 125°C; (4) package diameter—24.6mm versus 20mm; (5) product status—active versus obsolete.

Q: Are there any compliance or certification concerns with substitution?

A: Both components are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. No compliance barriers exist for substitution.

Q: Will the larger package diameter affect circuit performance?

A: The 4.6mm increase in disc diameter does not affect electrical performance. PCB layout must accommodate the larger footprint, and mechanical clearance to adjacent components should be verified.

Q: What is the capacitance difference, and does it matter?

A: The ERZ-V20D182 has 250 pF capacitance versus 260 pF for the ROV20-182K at 1 kHz. This 10 pF difference is negligible for most transient suppression applications and does not affect substitution suitability.

Q: Can I use the ERZ-V20D182 in applications requiring operation above 85°C?

A: The ERZ-V20D182 is rated to 85°C maximum operating temperature, compared to the ROV20-182K at 125°C. Applications requiring sustained operation above 85°C require alternative component selection or thermal management design review.