ROV20-151K Equivalent & Substitute Parts

Part Overview

The ROV20-151K is a 150V, 6.5kA disc varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole applications. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The varistor operates across a temperature range of -40°C to 125°C and is housed in a 20mm disc package.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	150 V
Current - Surge	6.5 kA
Maximum AC Volts	95 V
Maximum DC Volts	125 V
Energy	88 J
Operating Temperature Range	-40°C to 125°C
Package / Case	Disc 20mm
Mounting Type	Through Hole
Number of Circuits	1

Substitute Part Grouping Explanation

Substitution of the ROV20-151K is determined by alignment of the following critical electrical and mechanical parameters:

Varistor voltage rating (minimum, typical, and maximum values within specification)
Maximum AC and DC voltage ratings
Surge current capacity
Operating temperature range compatibility
Through-hole mounting configuration
Disc package form factor
Single-circuit configuration

The ERZ-V20D151 (Panasonic Electronic Components) meets these substitution criteria with matching voltage ratings (135V–165V range, 150V typical), compatible AC/DC voltage limits, and identical mounting and circuit configuration. The substitute part demonstrates enhanced surge current capacity (10kA versus 6.5kA) and increased energy rating (106J versus 88J), positioning it as a direct functional replacement with improved performance margins.

Parameter Comparison

Parameter	ROV20-151K (Littelfuse)	ERZ-V20D151 (Panasonic)
Varistor Voltage (Min)	135 V	135 V
Varistor Voltage (Typ)	150 V	150 V
Varistor Voltage (Max)	165 V	165 V
Maximum AC Volts	95 V	95 V
Maximum DC Volts	125 V	125 V
Current - Surge	6.5 kA	10 kA
Energy	88 J	106 J
Number of Circuits	1	1
Mounting Type	Through Hole	Through Hole
Operating Temperature (Min)	-40°C	-40°C
Operating Temperature (Max)	125°C	85°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The ERZ-V20D151 is qualified as a direct substitute for the obsolete ROV20-151K based on electrical parameter alignment and regulatory compliance. Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity in applications subject to these requirements.

The substitute part exhibits a reduced maximum operating temperature ceiling (85°C versus 125°C). Applications requiring sustained operation above 85°C ambient temperature require thermal analysis to confirm the ERZ-V20D151 remains within acceptable operating margins.

The ERZ-V20D151 provides enhanced surge current handling (10kA versus 6.5kA) and energy absorption (106J versus 88J), delivering improved transient suppression performance without compromising circuit compatibility.

Frequently Asked Questions (FAQ)

Q: Can the ERZ-V20D151 be used as a direct replacement for the ROV20-151K in existing designs?

A: Yes. The ERZ-V20D151 matches the critical electrical parameters (varistor voltage, AC/DC ratings, surge current, and circuit configuration) and mounting type required for functional equivalence. The substitute part is pin-compatible and footprint-compatible with the original component.

Q: What is the impact of the different package dimensions (20mm versus 21.5mm disc)?

A: The ERZ-V20D151 uses a 21.5mm disc package compared to the 20mm disc of the ROV20-151K. PCB layout verification is necessary to confirm the larger package accommodates existing mounting hole spacing and clearance requirements.

Q: Does the lower maximum operating temperature of the ERZ-V20D151 affect suitability?

A: The ERZ-V20D151 operates to 85°C maximum ambient temperature, compared to 125°C for the ROV20-151K. Applications with sustained operation above 85°C require thermal margin analysis. For applications operating within 85°C ambient conditions, this parameter does not restrict substitution.

Q: Are both components compliant with current regulatory requirements?

A: Yes. Both the ROV20-151K and ERZ-V20D151 are ROHS3 compliant and REACH unaffected, meeting current regulatory standards for electronic component procurement.

Q: What is the significance of the higher surge current rating on the substitute part?

A: The ERZ-V20D151 provides 10kA surge capacity versus 6.5kA on the original component. This enhanced rating provides additional margin for transient suppression without introducing compatibility issues, as the substitute part remains within the same voltage classification and circuit configuration.

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