ROV14-751K-S Equivalent & Substitute Parts

Part Overview

The ROV14-751K-S is a 750V 4.5kA disc varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole applications. This component is classified as obsolete, making substitute parts necessary for ongoing production and maintenance requirements. The varistor provides protection against voltage transients with a 14mm disc form factor and operates across a temperature range of -40°C to 125°C.

Substiute Parts

ROV14-751K-S

Littelfuse Inc.In Stock: 1120ROV14-751K-S Datasheet

Current PartRFQ

ERZ-V14D751

Panasonic Electronic ComponentsIn Stock: 1484ERZ-V14D751 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ROV14-751K-S is determined by the following critical parameters:

• Varistor Voltage Range: Minimum 675V, Typical 750V, Maximum 825V
• Surge Current Capability: Minimum 4.5 kA
• Maximum AC/DC Voltage Ratings: 460V AC / 615V DC
• Mounting Configuration: Through hole disc form factor
• Operating Temperature: Compatibility within specified range
• Number of Circuits: Single circuit requirement
• RoHS Compliance: ROHS3 Compliant status

The ERZ-V14D751 meets these substitution criteria with equivalent voltage ratings and surge current performance suitable for direct replacement in circuit designs.

Parameter Comparison

Engineering Selection Recommendations

The ERZ-V14D751 is an active product substitute for the obsolete ROV14-751K-S. Both components maintain identical varistor voltage specifications (675V–825V range) and equivalent maximum voltage ratings (460V AC / 615V DC). The substitute provides higher surge current capability (5 kA versus 4.5 kA) and greater energy absorption (210J versus 180J), offering enhanced transient protection margins.

Both parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The ERZ-V14D751 operates within a reduced temperature range (-40°C to 85°C) compared to the original part (-40°C to 125°C); applications requiring operation above 85°C require thermal analysis. The package form factor differs slightly (16mm disc versus 14mm disc), necessitating PCB layout verification for mechanical fit.

Frequently Asked Questions (FAQ)

Q: Can the ERZ-V14D751 directly replace the ROV14-751K-S in all applications?

A: Direct replacement is possible when the operating temperature does not exceed 85°C and the 16mm disc package fits within the available PCB space. Varistor voltage ratings and surge current specifications are compatible.

Q: What is the significance of the higher surge current rating (5 kA) in the substitute?

A: The ERZ-V14D751 provides 5 kA surge capability versus 4.5 kA in the original part. This represents enhanced transient suppression capacity and does not create incompatibility; circuits designed for 4.5 kA operation remain protected.

Q: How does the package size difference affect substitution?

A: The ERZ-V14D751 uses a 16mm disc package compared to the 14mm disc of the ROV14-751K-S. PCB layout and mounting hole spacing must accommodate the larger diameter to ensure proper mechanical fit and electrical connection.

Q: Are there compliance or certification differences between these parts?

A: Both components are ROHS3 compliant and REACH unaffected. No compliance barriers exist for substitution in regulated applications.

Q: What is the impact of the operating temperature range difference?

A: The substitute operates to 85°C maximum versus 125°C for the original part. Applications with ambient or component temperatures exceeding 85°C require thermal evaluation to confirm the substitute remains within safe operating limits.