ROV07-121K Equivalent & Substitute Parts

Part Overview

The ROV07-121K is a 120 V, 1.2 kA Transient Voltage Suppressor (TVS) varistor manufactured by Littelfuse in a through-hole disc 7mm package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The varistor provides transient voltage suppression across a single circuit with an operating temperature range of -40°C to 125°C and is fully RoHS3 compliant.

Substiute Parts

ROV07-121K

LittelfuseIn Stock: 849ROV07-121K Datasheet

Current PartRFQ

V120ZA1P

Littelfuse Inc.In Stock: 1848V120ZA1P Datasheet

DirectRFQ

ERZ-V07D121

Panasonic Electronic ComponentsIn Stock: 77857ERZ-V07D121 Datasheet

MFR RecommendedRFQ

VDRS07H075BSE

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 986VDRS07H075BSE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ROV07-121K are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Varistor voltage range: 108 V (Min) to 132 V (Max)
• Maximum DC voltage rating: 100 V or higher
• Maximum AC voltage rating: 75 V
• Single circuit configuration
• Through-hole mounting type
• RoHS3 compliance

Secondary Considerations:

• Current surge capacity: 1.2 kA or higher
• Energy absorption: 6 J or higher
• Operating temperature range compatibility
• Package form factor (disc geometry)

The three substitute parts listed below meet the primary electrical criteria and are all active products with current manufacturing status, making them suitable replacements for the obsolete ROV07-121K.

Parameter Comparison

Engineering Selection Recommendations

V120ZA1P (Littelfuse Inc.)

The V120ZA1P is an active product from the same manufacturer as the main part, offering identical electrical specifications and the same 7mm disc package form factor. This part maintains full compatibility with existing PCB layouts and provides the closest functional match. The V120ZA1P is available in bulk packaging with higher inventory levels (1785 pcs) and carries RoHS3 compliance. The operating temperature range is reduced to -55°C to 85°C compared to the original -40°C to 125°C specification.

ERZ-V07D121 (Panasonic Electronic Components)

The ERZ-V07D121 is a Panasonic ZNR® series varistor with identical varistor voltage specifications and higher surge current capacity (1.75 kA versus 1.2 kA) and energy absorption (10 J versus 8 J). The package form factor is a 8.5mm disc, which is larger than the original 7mm package and may require PCB layout modifications. This part is RoHS3 compliant and has extensive inventory availability (77789 pcs). The operating temperature range is -40°C to 85°C.

VDRS07H075BSE (Vishay Beyschlag/Draloric/BC Components)

The VDRS07H075BSE is a Vishay VDRS series varistor with matching electrical specifications and higher energy absorption (10 J versus 8 J). The package is a 9mm disc, requiring PCB layout modifications compared to the original 7mm package. This part is RoHS3 compliant with moderate inventory availability (931 pcs) and an operating temperature range of -40°C to 85°C.

All three substitute parts meet the core electrical requirements for transient voltage suppression at 120 V nominal with 1.2 kA or higher surge current capacity. Selection should be based on package compatibility with existing PCB designs and operating temperature requirements.

Frequently Asked Questions (FAQ)

Q: Can the V120ZA1P be used as a direct replacement for the ROV07-121K?

A: Yes. The V120ZA1P maintains identical varistor voltage specifications (120 V nominal), surge current capacity (1.2 kA), and package geometry (7mm disc). Both are Littelfuse products with RoHS3 compliance. The primary difference is the reduced upper operating temperature limit (85°C versus 125°C) and slightly higher maximum DC voltage rating (102 V versus 100 V).

Q: What are the implications of using the ERZ-V07D121 or VDRS07H075BSE substitutes?

A: Both parts have larger package geometries (8.5mm and 9mm discs respectively versus 7mm). This requires verification that the PCB footprint can accommodate the larger diameter. Both parts offer higher energy absorption capacity (10 J versus 8 J) and higher surge current ratings, making them electrically superior for transient suppression. Operating temperature ranges are reduced to -40°C to 85°C.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All three substitute parts—V120ZA1P, ERZ-V07D121, and VDRS07H075BSE—are RoHS3 compliant and REACH unaffected, matching the compliance status of the original ROV07-121K.

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

A: The ROV07-121K and V120ZA1P absorb 8 J and 6 J respectively. The ERZ-V07D121 and VDRS07H075BSE both absorb 10 J, providing higher transient energy handling capacity. Selection depends on the specific transient energy levels in the application circuit.

Q: Can I use these parts interchangeably in the same circuit?

A: All parts meet the core electrical specifications (120 V nominal varistor voltage, 75 V maximum AC, 100 V maximum DC). However, package size differences must be verified against PCB layout constraints. The V120ZA1P offers the most direct substitution due to identical package geometry.