V420LS20A Equivalent & Substitute Parts

Part Overview

The V420LS20A is a 680 V, 4.5 kA disc varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole applications. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance requirements. Substitute parts maintain identical electrical and mechanical specifications while offering active product status and improved availability.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	680 V
Current - Surge	4.5 kA
Maximum AC Volts	420 V
Maximum DC Volts	560 V
Energy	90 J
Mounting Type	Through Hole
Package / Case	Disc 14mm
Operating Temperature Range	-55°C to 85°C
Capacitance @ 1 MHz	300 pF
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the V420LS20A are qualified based on strict electrical and mechanical parameter matching:

Qualifying Parameters for Substitution:

Varistor voltage range: 612 V (Min) to 748 V (Max), with 680 V typical
Surge current capacity: 4.5 kA
Maximum AC/DC voltage ratings: 420 V AC / 560 V DC
Energy dissipation: 90 J
Physical form factor: Through-hole disc 14mm
Operating temperature: -55°C to 85°C
Capacitance: 300 pF @ 1 MHz
Compliance: ROHS3 Compliant, MSL 1

All substitute parts listed maintain these parameters identically. Differences exist only in series designation (LS, LT, LU), packaging format (bulk vs. tape & reel), and product status (active vs. obsolete).

Parameter Comparison

Part Number	Manufacturer	Series	Varistor Voltage (Typ)	Surge Current	Max AC / DC Volts	Energy	Package	Product Status	Inventory (Pcs)
V420LS20A	Littelfuse Inc.	LS	680 V	4.5 kA	420 V / 560 V	90 J	Disc 14mm	Obsolete	1094
V420LS20AP	Littelfuse Inc.	LS	680 V	4.5 kA	420 V / 560 V	90 J	Disc 14mm	Active	653
V420LS20APX2855	Littelfuse	LS	680 V	4.5 kA	420 V / 560 V	90 J	Disc 14mm	Active	781
V420LT20AP	Littelfuse Inc.	LT	680 V	4.5 kA	420 V / 560 V	90 J	Disc 14mm	Active	1063
V420LT20APX2855	Littelfuse Inc.	LT	680 V	4.5 kA	420 V / 560 V	90 J	Disc 14mm	Active	695
V420LU20AP	Littelfuse Inc.	LU	680 V	4.5 kA	420 V / 560 V	90 J	Disc 14mm	Active	878
V420LU20APX2855	Littelfuse Inc.	LU	680 V	4.5 kA	420 V / 560 V	90 J	Disc 14mm	Active	1119

Engineering Selection Recommendations

Primary Recommendation: V420LS20AP

The V420LS20AP is the direct equivalent to the obsolete V420LS20A, maintaining identical series designation (LS) while offering active product status. This part is available in tape & reel packaging and carries ROHS3 compliance with REACH unaffected status.

Alternative Options:

V420LS20APX2855, V420LT20AP, V420LT20APX2855, V420LU20AP, and V420LU20APX2855 are all parametrically equivalent alternatives. These parts differ only in series designation and packaging configuration. All maintain active product status and full compliance certifications. Selection among these alternatives should be based on packaging requirements (tape & reel vs. bulk) and internal supply chain preferences, as electrical performance is identical across all options.

Frequently Asked Questions (FAQ)

Q: Can I substitute V420LS20A with any of the listed parts?

A: Yes. All listed substitute parts maintain identical electrical parameters (680 V typical varistor voltage, 4.5 kA surge current, 90 J energy) and mechanical specifications (through-hole disc 14mm form factor). Substitution is electrically and mechanically valid.

Q: What is the difference between LS, LT, and LU series designations?

A: Series designation differences (LS, LT, LU) do not affect electrical or mechanical performance for these parts. All maintain identical voltage ratings, surge current capacity, and physical dimensions. Series designation reflects internal Littelfuse manufacturing or design revision tracking and does not impact circuit compatibility.

Q: Does packaging format affect electrical performance?

A: No. Tape & reel (TR) packaging and bulk packaging contain identical components. Packaging format affects only handling, storage, and assembly processes. Electrical and thermal characteristics remain unchanged.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification. The obsolete V420LS20A also meets ROHS3 requirements.

Q: What is the significance of the X2855 designation in part numbers?

A: The X2855 suffix indicates a specific packaging or manufacturing variant. Parts with and without this suffix maintain identical electrical specifications and are functionally equivalent. Selection should be based on supply chain availability and packaging requirements.

Q: Can I mix different series parts in the same circuit?

A: Yes. Since LS, LT, and LU series parts are parametrically identical for this voltage and current rating, they can be used interchangeably in the same application without circuit redesign or performance impact.

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