ROV07-330K-S Equivalent & Substitute Parts

Part Overview

The ROV07-330K-S is a 33 V varistor manufactured by Littelfuse Inc., rated for 250 A surge current in a 7mm disc through-hole package. This component is classified as a Transient Voltage Suppressor (TVS) and is used for transient overvoltage protection in electronic circuits. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements. Substitute parts must maintain electrical compatibility while accommodating potential package and performance variations.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	33 V
Current - Surge	250 A
Maximum AC Volts	20 V
Maximum DC Volts	26 V
Energy	2.2 J
Operating Temperature Range	-40°C ~ 125°C
Mounting Type	Through Hole
Package / Case	Disc 7mm
Number of Circuits	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the ROV07-330K-S is determined by the following critical parameters:

Varistor voltage rating must fall within the specified range (29.7 V minimum to 36.3 V maximum)
Surge current capacity must meet or exceed 250 A
Maximum AC and DC voltage ratings must be maintained at 20 V and 26 V respectively
Through-hole mounting configuration is required
Single-circuit configuration is required
Operating temperature range must support the application environment
RoHS3 compliance is mandatory for regulatory alignment

Two substitute parts meet these criteria with acceptable variations in package geometry and surge current capacity.

Parameter Comparison

Parameter	ROV07-330K-S (Main)	ERZ-V07D330	VDRS07B020TSE
Manufacturer	Littelfuse Inc.	Panasonic Electronic Components	Vishay Beyschlag/Draloric/BC Components
Varistor Voltage (Min)	29.7 V	30 V	29.7 V
Varistor Voltage (Typ)	33 V	33 V	33 V
Varistor Voltage (Max)	36.3 V	36 V	36.3 V
Current - Surge	250 A	500 A	250 A
Maximum AC Volts	20 V	20 V	20 V
Maximum DC Volts	26 V	26 V	26 V
Energy	2.2 J	2 J	2.5 J
Number of Circuits	1	1	1
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Disc 7mm	Disc 8.5mm	Disc 9mm
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Both substitute parts are active products with ROHS3 compliance, providing regulatory continuity for the obsolete ROV07-330K-S.

ERZ-V07D330 (Panasonic): This substitute offers enhanced surge current capacity at 500 A, exceeding the original 250 A specification. The varistor voltage range (30 V to 36 V) is compatible with the original specification. The package diameter increases from 7mm to 8.5mm, requiring PCB layout verification. Operating temperature range is reduced to -40°C ~ 85°C. This part is suitable for applications where higher transient current handling is beneficial and thermal environment does not exceed 85°C.

VDRS07B020TSE (Vishay): This substitute maintains the original 250 A surge current rating and varistor voltage range (29.7 V to 36.3 V). The package diameter increases from 7mm to 9mm, requiring PCB layout verification. Operating temperature range is reduced to -40°C ~ 85°C. Energy rating increases to 2.5 J. This part provides the closest electrical match to the original specification with minimal performance deviation.

Both substitutes require PCB footprint assessment due to increased package diameters. Application thermal requirements must not exceed 85°C for either substitute.

Frequently Asked Questions (FAQ)

Q: Can ERZ-V07D330 be used as a direct replacement for ROV07-330K-S?

A: ERZ-V07D330 is electrically compatible within the varistor voltage specification range. However, the package diameter increases from 7mm to 8.5mm, requiring PCB layout verification. The surge current rating of 500 A exceeds the original 250 A requirement. Operating temperature range is limited to -40°C ~ 85°C compared to the original -40°C ~ 125°C.

Q: Can VDRS07B020TSE be used as a direct replacement for ROV07-330K-S?

A: VDRS07B020TSE maintains electrical compatibility with matching varistor voltage and surge current ratings. The package diameter increases from 7mm to 9mm, requiring PCB layout verification. Operating temperature range is limited to -40°C ~ 85°C compared to the original -40°C ~ 125°C.

Q: What is the primary difference between the two substitute parts?

A: ERZ-V07D330 provides higher surge current capacity (500 A vs. 250 A) with a smaller package increase (8.5mm vs. 9mm). VDRS07B020TSE maintains the original surge current rating (250 A) with a larger package increase (9mm) and higher energy rating (2.5 J vs. 2.2 J).

Q: Are package geometry changes critical for substitution?

A: Package diameter changes from 7mm to either 8.5mm or 9mm require PCB footprint assessment. Mechanical clearance, lead spacing, and mounting hole alignment must be verified against the original design layout.

Q: Do the substitute parts meet the same compliance standards?

A: Both substitute parts are ROHS3 compliant and REACH unaffected, maintaining regulatory alignment with the original ROV07-330K-S.

Q: What is the impact of the reduced operating temperature range on substitution?

A: Both substitutes limit operating temperature to -40°C ~ 85°C compared to the original -40°C ~ 125°C. Applications requiring operation above 85°C cannot use these substitutes without thermal management modifications.

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