ROV07H331K-S Equivalent & Substitute Parts

Part Overview

The ROV07H331K-S is a 330 V, 1.75 kA disc varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole applications. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement continuity. The varistor provides single-circuit protection with a 7mm disc form factor and operates across a temperature range of -40°C to 125°C.

Substiute Parts

ROV07H331K-S

Littelfuse Inc.In Stock: 746ROV07H331K-S Datasheet

Current PartRFQ

ERZ-V07D331

Panasonic Electronic ComponentsIn Stock: 2850ERZ-V07D331 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ROV07H331K-S is determined by electrical and mechanical parameter alignment within the transient voltage suppressor category. The primary substitution criteria are:

• Varistor voltage rating (nominal 330 V with tolerance range 297 V to 363 V)
• Surge current capacity (1.75 kA minimum)
• Energy absorption capability (28 J)
• Single-circuit configuration
• Through-hole mounting compatibility
• Operating temperature range compatibility
• RoHS3 compliance and REACH unaffected status

The ERZ-V07D331 from Panasonic Electronic Components meets these electrical specifications. Physical package differences (8.5mm disc versus 7mm disc) require mechanical validation for PCB layout compatibility, though both maintain through-hole mounting architecture.

Parameter Comparison

Engineering Selection Recommendations

The ERZ-V07D331 is the primary substitute for the ROV07H331K-S based on electrical parameter equivalence and active product status. Key considerations for selection:

• The substitute maintains identical varistor voltage ratings and surge current capacity, ensuring equivalent transient suppression performance.
• Maximum DC voltage specification of the substitute (270 V) is marginally lower than the original (275 V); applications operating at or near 275 V DC require circuit-level validation.
• Operating temperature maximum of the substitute (85°C) is lower than the original (125°C); applications requiring sustained operation above 85°C require thermal analysis.
• Physical package difference (8.5mm disc versus 7mm disc) necessitates PCB layout verification for mounting hole spacing and component clearance.
• Both parts maintain RoHS3 compliance and REACH unaffected status, supporting regulatory continuity.
• The substitute is currently in active production, providing long-term procurement availability compared to the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can the ERZ-V07D331 be used as a direct replacement for the ROV07H331K-S?

A: Electrical substitution is valid based on varistor voltage, surge current, and energy specifications. Mechanical substitution requires PCB layout verification due to package size difference (8.5mm versus 7mm disc).

Q: What is the significance of the maximum DC voltage difference (275 V versus 270 V)?

A: The 5 V difference represents the upper operating limit for each component. Circuits designed to operate at 275 V DC with the original part require evaluation to confirm compatibility with the 270 V maximum of the substitute.

Q: Does the lower maximum operating temperature of the substitute affect compatibility?

A: The substitute operates to 85°C maximum versus 125°C for the original. Applications with sustained operating temperatures above 85°C require thermal analysis to confirm the substitute remains within specification.

Q: Are there physical mounting considerations for the package change?

A: Yes. The 8.5mm disc package is larger than the 7mm disc. PCB hole spacing, component clearance, and thermal dissipation area must be verified before implementation.

Q: Do both parts meet the same regulatory requirements?

A: Both parts are RoHS3 compliant and REACH unaffected, maintaining equivalent regulatory status for applications subject to these standards.

Q: What is the capacitance difference between the two parts?

A: The original part has 140 pF at 1 kHz; the substitute has 130 pF. This 10 pF difference is within typical component tolerance and does not affect standard transient suppression applications.