ROV07-270K-S Equivalent & Substitute Parts

Part Overview

The ROV07-270K-S is a 27V 250A varistor manufactured by Littelfuse Inc., designed for transient voltage suppression applications. This through-hole disc component (7mm) operates across -40°C to 125°C and is RoHS3 compliant. The product is currently obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs requiring compatible voltage suppression functionality.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	27 V
Current - Surge	250 A
Maximum AC Volts	17 V
Maximum DC Volts	22 V
Energy	1.7 J
Number of Circuits	1
Operating Temperature Range	-40°C ~ 125°C
Mounting Type	Through Hole
Package / Case	Disc 7mm
RoHS Status	RoHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the ROV07-270K-S is determined by the following critical parameters:

Varistor voltage rating: 27V nominal (acceptable range 24V–30V)
Surge current capacity: minimum 250A
Maximum AC/DC voltage ratings: 17V AC / 22V DC
Single circuit configuration
Through-hole mounting
RoHS3 compliance

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

Parameter Comparison

Parameter	ROV07-270K-S (Littelfuse)	ERZ-V07D270 (Panasonic)	VDRS07B017TSE (Vishay)
Varistor Voltage (Min)	24.3 V	24 V	24.3 V
Varistor Voltage (Typ)	27 V	27 V	27 V
Varistor Voltage (Max)	29.7 V	30 V	29.7 V
Current - Surge	250 A	500 A	250 A
Maximum AC Volts	17 V	17 V	17 V
Maximum DC Volts	22 V	22 V	22 V
Energy	1.7 J	1.6 J	2 J
Number of Circuits	1	1	1
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Disc 7mm	Disc 8.5mm	Disc 9mm
RoHS Status	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant

Engineering Selection Recommendations

Both substitute parts satisfy the core electrical requirements of the ROV07-270K-S and maintain RoHS3 compliance.

ERZ-V07D270 (Panasonic ZNR®): This part provides doubled surge current capacity (500A vs. 250A) and is in active production status. The 8.5mm disc package is slightly larger than the original 7mm. Operating temperature range is limited to -40°C to 85°C, which is narrower than the original specification. This substitute is suitable for applications where higher transient current handling is beneficial and thermal environment does not exceed 85°C.

VDRS07B017TSE (Vishay VDRS Series): This part maintains identical surge current capacity (250A) and varistor voltage specifications as the original. The 9mm disc package represents a moderate size increase. Operating temperature range is -40°C to 85°C. Energy rating is slightly higher at 2J. This substitute provides the closest electrical match to the original ROV07-270K-S and is in active production status.

Frequently Asked Questions (FAQ)

Q: Can ERZ-V07D270 be used in place of ROV07-270K-S in all applications?

A: ERZ-V07D270 meets all core electrical parameters. However, the 8.5mm package size must fit within the PCB layout, and the reduced operating temperature maximum (85°C vs. 125°C) must be verified against system thermal requirements.

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

A: ERZ-V07D270 offers higher surge current capacity (500A) with a slightly larger package. VDRS07B017TSE maintains the original 250A surge rating with a 9mm package and higher energy dissipation (2J). Selection depends on available PCB space and whether enhanced surge current protection is required.

Q: Are package size differences critical for substitution?

A: Package size differences (7mm original vs. 8.5mm or 9mm substitutes) require verification against PCB layout constraints. Mechanical fit must be confirmed before implementation.

Q: Do both substitutes maintain compliance certifications?

A: Both ERZ-V07D270 and VDRS07B017TSE are RoHS3 compliant and REACH unaffected, matching the original part's regulatory status.

Q: What is the impact of the reduced operating temperature range in the substitutes?

A: Both substitutes operate to 85°C maximum, compared to the original 125°C specification. Applications requiring operation above 85°C ambient or junction temperature require thermal analysis to confirm suitability.

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