ROV20-470L-S Equivalent & Substitute Parts

Part Overview

The ROV20-470L-S is a 47 V, 2 kA disc varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole applications. This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance requirements. The part operates across a temperature range of -40°C to 125°C and is housed in a 20mm disc package. Substitute parts must maintain electrical compatibility across varistor voltage, surge current capacity, and thermal operating ranges while meeting RoHS3 compliance requirements.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	47 V
Current - Surge	2 kA
Maximum AC Volts	30 V
Maximum DC Volts	38 V
Energy	17 J
Operating Temperature Range	-40°C to 125°C
Package / Case	Disc 20mm
Mounting Type	Through Hole
Number of Circuits	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the ROV20-470L-S is determined by the following critical parameters:

Varistor Voltage (Typical): Must be 47 V
Current - Surge: Must be 2 kA or greater
Maximum AC Volts: Must be 30 V or greater
Maximum DC Volts: Must be 38 V or greater
Package / Case: Must be Disc 20mm or Disc 21.5mm (compatible disc geometry)
Mounting Type: Must be Through Hole
Number of Circuits: Must be 1
RoHS Status: Must be ROHS3 Compliant

All substitute parts listed meet these criteria. The ERZ-V20D470 variant features a 3 kA surge current rating and slightly larger 21.5mm disc package, providing enhanced energy absorption capability while maintaining electrical compatibility.

Parameter Comparison

Parameter	ROV20-470L-S (Littelfuse)	B72220S0300K101 (EPCOS - TDK)	ERZ-V20D470 (Panasonic)	MOV-20D470K (Bourns)	MOV-20D470KTR (Bourns)
Varistor Voltage (Min)	39.95 V	42.3 V	42 V	42 V	42 V
Varistor Voltage (Typ)	47 V	47 V	47 V	47 V	47 V
Varistor Voltage (Max)	54.05 V	51.7 V	52 V	52 V	52 V
Current - Surge	2 kA	2 kA	3 kA	2 kA	2 kA
Energy	17 J	26 J	34 J	33 J	33 J
Maximum AC Volts	30 V	30 V	30 V	30 V	30 V
Maximum DC Volts	38 V	38 V	38 V	38 V	38 V
Operating Temperature Range	-40°C to 125°C	-40°C to 105°C	-40°C to 85°C	-40°C to 105°C	-40°C to 105°C
Package / Case	Disc 20mm	Disc 20mm	Disc 21.5mm	Disc 20mm	Disc 20mm
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All four substitute parts are active products with ROHS3 compliance, making them suitable replacements for the obsolete ROV20-470L-S. Selection should be based on application-specific requirements:

B72220S0300K101 (EPCOS - TDK Electronics) maintains identical surge current (2 kA) and package geometry (Disc 20mm) with improved energy rating (26 J). Operating temperature range is -40°C to 105°C, which is lower than the original part but sufficient for most industrial applications.

ERZ-V20D470 (Panasonic Electronic Components) offers enhanced surge current capacity (3 kA) and highest energy absorption (34 J), suitable for applications requiring greater transient protection. The 21.5mm disc package is mechanically compatible with standard 20mm mounting footprints. Operating temperature range is -40°C to 85°C.

MOV-20D470K and MOV-20D470KTR (Bourns Inc.) are functionally identical variants differing only in packaging format (Bulk versus Cut Tape). Both maintain 2 kA surge current, 20mm disc package, and provide 33 J energy rating. Operating temperature range is -40°C to 105°C. MOV-20D470KTR is available in cut tape format for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can ERZ-V20D470 be used as a direct replacement despite the 21.5mm package size?

A: Yes. The ERZ-V20D470 features a 21.5mm disc package compared to the 20mm standard. The slightly larger diameter remains compatible with through-hole mounting applications and PCB footprints designed for disc varistors in this voltage class. The enhanced 3 kA surge rating provides additional protection margin.

Q: What is the difference between MOV-20D470K and MOV-20D470KTR?

A: Both parts are electrically and mechanically identical. MOV-20D470K is supplied in bulk packaging, while MOV-20D470KTR is supplied in cut tape format. Selection depends on assembly process requirements: bulk for manual assembly or small-volume production, cut tape for automated pick-and-place equipment.

Q: Are all substitutes suitable for applications requiring the full -40°C to 125°C temperature range of the original part?

A: No. The original ROV20-470L-S operates to 125°C. Substitute parts have lower maximum operating temperatures: B72220S0300K101 and Bourns variants to 105°C, ERZ-V20D470 to 85°C. Applications requiring operation above 105°C must retain the original part or identify alternative solutions. For applications with maximum operating temperatures at or below 105°C, all substitutes are suitable.

Q: Which substitute provides the best energy absorption capability?

A: ERZ-V20D470 provides the highest energy rating at 34 J, compared to 17 J for the original part. MOV-20D470K and MOV-20D470KTR provide 33 J. B72220S0300K101 provides 26 J. Selection should match application transient energy requirements.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

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