ROV20-102K-S Equivalent & Substitute Parts

Part Overview

The ROV20-102K-S is a 1 kV, 6.5 kA disc varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole applications. This component is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for continued system support and new designs.

Key Parameters

Parameter	Value
Varistor Voltage (Typ)	1 kV
Current - Surge	6.5 kA
Maximum AC Volts	625 V
Maximum DC Volts	825 V
Mounting Type	Through Hole
Number of Circuits	1
Operating Temperature Range	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the ROV20-102K-S is determined by the following critical parameters:

Varistor voltage rating: 900 V minimum to 1.1 kV maximum
Surge current capacity: 6.5 kA minimum
Maximum AC voltage: 625 V
Maximum DC voltage: 825 V
Mounting configuration: Through hole
Single circuit design
RoHS3 compliance

Two active substitute parts meet these electrical and mechanical criteria: B72220S0621K101 (EPCOS - TDK Electronics) and VDRS20W625BSE (Vishay Beyschlag/Draloric/BC Components). Both maintain identical voltage ratings, surge current capacity, and compliance certifications. Mechanical package differences exist in disc diameter (20mm vs. 23mm) and operating temperature ranges, which must be evaluated against specific application requirements.

Parameter Comparison

Parameter	ROV20-102K-S (Littelfuse)	B72220S0621K101 (EPCOS - TDK)	VDRS20W625BSE (Vishay)
Varistor Voltage (Min)	900 V	900 V	900 V
Varistor Voltage (Typ)	1 kV	1 kV	1 kV
Varistor Voltage (Max)	1.1 kV	1.1 kV	1.1 kV
Current - Surge	6.5 kA	6.5 kA	6.5 kA
Maximum AC Volts	625 V	625 V	625 V
Maximum DC Volts	825 V	825 V	825 V
Number of Circuits	1	1	1
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Disc 20mm	Disc 20mm	Disc 23mm
Operating Temperature (Min)	-40°C	-40°C	-40°C
Operating Temperature (Max)	125°C	105°C	85°C
Energy	448 J	230 J	448 J
Capacitance @ 1 kHz	400 pF	380 pF	320 pF
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

Both B72220S0621K101 and VDRS20W625BSE are active products with ROHS3 compliance and REACH unaffected status, providing regulatory continuity for the obsolete ROV20-102K-S.

B72220S0621K101 maintains the original 20mm disc package diameter, minimizing PCB layout modifications. However, the maximum operating temperature is limited to 105°C compared to the original 125°C specification, and energy absorption is reduced to 230 J.

VDRS20W625BSE preserves the full 448 J energy rating and supports operation to 85°C maximum. The 23mm disc package requires PCB footprint adjustment. Lower capacitance (320 pF) may be advantageous in high-frequency applications.

Selection between these substitutes depends on thermal environment constraints, PCB layout flexibility, and energy absorption requirements specific to the application.

Frequently Asked Questions (FAQ)

Q: Can B72220S0621K101 be used as a direct replacement for ROV20-102K-S?

A: B72220S0621K101 matches all critical electrical parameters and maintains the 20mm disc package. The reduced maximum operating temperature (105°C vs. 125°C) and energy rating (230 J vs. 448 J) must be evaluated against application requirements.

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

A: B72220S0621K101 retains the 20mm package but has lower temperature and energy ratings. VDRS20W625BSE maintains the 448 J energy rating and uses a 23mm package, requiring PCB layout verification.

Q: Are both substitute parts RoHS compliant?

A: Both B72220S0621K101 and VDRS20W625BSE are ROHS3 compliant and REACH unaffected, matching the compliance profile of the original ROV20-102K-S.

Q: Does the 23mm package of VDRS20W625BSE affect electrical performance?

A: Package diameter does not alter electrical performance. The 23mm size requires verification of available PCB footprint space and lead spacing compatibility with existing through-hole mounting patterns.

Q: Which substitute is preferred for high-temperature applications?

A: B72220S0621K101 supports operation to 105°C. For applications requiring 125°C operation, neither substitute maintains the original specification; application thermal analysis is required to determine feasibility.

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