ROV07H121K Equivalent & Substitute Parts

Part Overview

The ROV07H121K is a 120V transient voltage suppressor (TVS) varistor manufactured by Littelfuse Inc., designed for single-circuit through-hole applications in a 7mm disc package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The varistor provides transient voltage suppression with a surge current rating of 1.75 kA and energy absorption capacity of 11J, suitable for protecting electronic circuits from voltage transients within the specified operating temperature range of -40°C to 125°C.

Substiute Parts

ROV07H121K

Littelfuse Inc.In Stock: 863ROV07H121K Datasheet

Current PartRFQ

ERZ-V07D121

Panasonic Electronic ComponentsIn Stock: 77857ERZ-V07D121 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ROV07H121K is determined by the following critical electrical and mechanical parameters:

• Varistor voltage rating (Min/Typ/Max): 108V / 120V / 132V
• Surge current capacity: 1.75 kA minimum
• Maximum AC and DC voltage ratings: 75V AC / 100V DC
• Single-circuit configuration
• Through-hole mounting requirement
• Operating temperature compatibility: minimum -40°C to 85°C overlap required
• RoHS3 compliance and REACH unaffected status

The ERZ-V07D121 meets all substitution criteria within these parameters. While the package size differs (8.5mm versus 7mm) and energy absorption is slightly lower (10J versus 11J), the electrical performance specifications and voltage ratings remain equivalent for circuit protection applications.

Parameter Comparison

Engineering Selection Recommendations

The ERZ-V07D121 is the qualified substitute for the ROV07H121K based on electrical equivalence and regulatory compliance. Both components maintain identical varistor voltage ratings, surge current capacity, and maximum voltage specifications. The substitute part is manufactured by Panasonic Electronic Components and carries active product status, ensuring long-term availability and supply chain continuity.

Both parts satisfy ROHS3 compliance and REACH unaffected requirements, meeting current environmental and regulatory standards. The primary design consideration is the package size difference (8.5mm versus 7mm disc), which requires PCB layout verification to confirm mechanical fit within the available board space. The operating temperature range of the substitute extends to 85°C maximum, which is acceptable for applications operating within this boundary; applications requiring operation above 85°C must retain the original ROV07H121K or identify alternative solutions.

Frequently Asked Questions (FAQ)

Q: Can the ERZ-V07D121 be used as a direct replacement for the ROV07H121K?

A: The ERZ-V07D121 is electrically equivalent for transient voltage suppression applications. The primary consideration is the package size: the substitute uses an 8.5mm disc versus the original 7mm disc. PCB layout must accommodate the larger package footprint.

Q: What is the difference in energy absorption between these parts?

A: The ROV07H121K absorbs 11J while the ERZ-V07D121 absorbs 10J. Both ratings are sufficient for single-circuit transient suppression at the specified voltage and current levels. Application-specific energy requirements should be evaluated during design review.

Q: Are there temperature operating range limitations with the substitute?

A: The ERZ-V07D121 operates from -40°C to 85°C, compared to the original part's -40°C to 125°C range. Applications requiring sustained operation above 85°C must confirm compatibility or identify alternative solutions.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both the ROV07H121K and ERZ-V07D121 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic component manufacturing and use.

Q: What is the capacitance difference, and does it affect circuit performance?

A: The ERZ-V07D121 has 590 pF capacitance at 1 kHz compared to 460 pF for the ROV07H121K. This 130 pF difference may affect high-frequency circuit behavior. Applications sensitive to capacitive loading should evaluate this parameter during design validation.

Q: Is the ERZ-V07D121 readily available?

A: Yes. The ERZ-V07D121 is in active product status with substantial inventory availability (77,789 pcs), ensuring reliable procurement compared to the obsolete ROV07H121K.