ROV20-220M-S Equivalent & Substitute Parts

Part Overview

The ROV20-220M-S is a 22V 2kA 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 parts that maintain electrical and mechanical compatibility for ongoing production and repair requirements.

Key Parameters

Parameter	Value
Varistor Voltage (Typ)	22 V
Current - Surge	2 kA
Maximum DC Volts	18 V
Maximum AC Volts	14 V
Energy	8 J
Package / Case	Disc 20mm
Mounting Type	Through Hole
Operating Temperature Range	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Varistor voltage nominal rating (22V)
Surge current capacity (minimum 2kA)
Package form factor (disc geometry and through-hole mounting)
Electrical compliance certifications (ROHS3, REACH)

The identified substitutes maintain the core voltage and mounting specifications. Variations in surge current capacity, energy rating, and operating temperature ranges are documented to enable informed selection based on application requirements.

Parameter Comparison

Parameter	ROV20-220M-S (Littelfuse)	B72220S0140K101 (EPCOS - TDK)	ERZ-V20D220 (Panasonic)
Varistor Voltage (Min)	17.6 V	19.8 V	20 V
Varistor Voltage (Typ)	22 V	22 V	22 V
Varistor Voltage (Max)	26.4 V	24.2 V	24 V
Current - Surge	2 kA	2 kA	3 kA
Energy	8 J	12 J	16 J
Maximum DC Volts	18 V	18 V	18 V
Maximum AC Volts	14 V	14 V	14 V
Number of Circuits	1	1	1
Capacitance @ 1 kHz	21200 pF	19000 pF	30000 pF
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 105°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Disc 20mm	Disc 20mm	Disc 21.5mm
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

B72220S0140K101 (EPCOS - TDK Electronics) provides direct electrical and mechanical compatibility with the ROV20-220M-S. This part maintains identical surge current capacity (2kA), varistor voltage rating (22V), and package dimensions (Disc 20mm). The substitute offers increased energy handling (12J versus 8J) and operates across a reduced temperature range (-40°C to 105°C). ROHS3 compliance and active product status support long-term availability.

ERZ-V20D220 (Panasonic Electronic Components) offers enhanced surge current capacity (3kA) and energy rating (16J) with identical voltage specifications and mounting configuration. The package dimension increases to Disc 21.5mm, requiring mechanical clearance verification. Operating temperature range is limited to -40°C to 85°C. ROHS3 compliance and active status ensure supply continuity.

Selection between substitutes depends on application thermal requirements, available board space, and transient energy exposure levels.

Frequently Asked Questions (FAQ)

Q: Can B72220S0140K101 directly replace ROV20-220M-S without circuit modification?

A: Yes. Both components share identical varistor voltage (22V), surge current rating (2kA), maximum DC/AC voltage limits, and through-hole disc package form factor (20mm). No circuit changes are required.

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

A: B72220S0140K101 maintains the original 2kA surge capacity with increased energy handling (12J). ERZ-V20D220 provides higher surge capacity (3kA) and energy rating (16J) but requires verification of the larger package dimension (21.5mm versus 20mm) and lower maximum operating temperature (85°C versus 105°C).

Q: Are both substitutes RoHS compliant?

A: Yes. Both B72220S0140K101 and ERZ-V20D220 are ROHS3 compliant and REACH unaffected, matching the compliance status of the original ROV20-220M-S.

Q: Does the package dimension difference between 20mm and 21.5mm affect board compatibility?

A: The ERZ-V20D220 disc diameter increases to 21.5mm. Physical clearance on the PCB must be verified before selection. The B72220S0140K101 maintains the original 20mm dimension and requires no layout changes.

Q: What is the impact of different operating temperature ranges?

A: The ROV20-220M-S operates to 125°C. B72220S0140K101 operates to 105°C, and ERZ-V20D220 to 85°C. Applications requiring operation above 105°C cannot use either substitute without thermal management review.

Q: Are inventory levels sufficient for production requirements?

A: B72220S0140K101 has 1770 units in stock. ERZ-V20D220 has 5834 units in stock. Both exceed typical component buffer requirements.

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