ROV05H391K-S Equivalent & Substitute Parts

Part Overview

The ROV05H391K-S is a 390V 800A varistor manufactured by Littelfuse Inc., designed for transient voltage suppression applications. This component features a through-hole disc 5mm package and is rated for 17J energy absorption with a surge current capacity of 800A. The part is currently classified as obsolete, necessitating identification of active equivalent components for ongoing design requirements and procurement needs.

Substiute Parts

ROV05H391K-S

Littelfuse Inc.In Stock: 827ROV05H391K-S Datasheet

Current PartRFQ

ERZ-V05D391

Panasonic Electronic ComponentsIn Stock: 19973ERZ-V05D391 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ROV05H391K-S is determined by electrical parameter equivalence across the following criteria:

• Varistor voltage rating: 390V nominal (351V minimum to 429V maximum range)
• Surge current capacity: 800A
• Energy absorption: 17J
• Maximum AC and DC voltage ratings: 250V AC / 320V DC
• Operating temperature range: -40°C to 85°C
• Number of circuits: Single circuit configuration
• Through-hole mounting requirement
• RoHS3 compliance and REACH unaffected status

The ERZ-V05D391 from Panasonic Electronic Components meets all electrical specifications and compliance requirements, with the distinction of active product status and higher capacitance characteristics at specified frequency.

Parameter Comparison

Engineering Selection Recommendations

The ERZ-V05D391 is the qualified substitute for the ROV05H391K-S based on electrical parameter equivalence and compliance alignment. Both components satisfy identical voltage, current, and energy specifications required for transient voltage suppression applications. The substitute part maintains ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity.

The primary distinction is product status: the ERZ-V05D391 maintains active manufacturing status with documented inventory availability, whereas the ROV05H391K-S is obsolete. Selection of the active equivalent ensures long-term supply chain viability and continued technical support from the manufacturer.

Frequently Asked Questions (FAQ)

Q: Can the ERZ-V05D391 be used as a direct replacement for the ROV05H391K-S?

A: Yes. Both components share identical electrical specifications: 390V nominal varistor voltage, 800A surge current, 17J energy rating, and -40°C to 85°C operating temperature range. Both are through-hole mounted, single-circuit varistors with ROHS3 compliance.

Q: What is the difference in package dimensions between these parts?

A: The ROV05H391K-S uses a 5mm disc package, while the ERZ-V05D391 uses a 7mm disc package. Physical board layout and mounting hole spacing must accommodate the larger 7mm diameter when implementing the substitute.

Q: Are there compliance or certification differences?

A: No. Both parts maintain identical RoHS3 compliance and REACH unaffected status. No additional certification or qualification is required for substitution from a regulatory standpoint.

Q: Why is the ROV05H391K-S classified as obsolete?

A: Littelfuse Inc. has discontinued this model. The ERZ-V05D391 from Panasonic remains in active production and is the recommended equivalent for new designs and ongoing procurement.

Q: What is the significance of the capacitance difference listed in the specifications?

A: The capacitance values are measured at different frequencies (55 pF @ 1 kHz for ROV05H391K-S versus 80 pF @ 1 MHz for ERZ-V05D391). This reflects measurement methodology differences and does not affect functional equivalence for transient voltage suppression applications.