Littelfuse V22ZS2 Equivalent & Substitute Parts

Part Overview

The Littelfuse V22ZS2 is a 22 V, 500 A disc varistor designed for transient voltage suppression in through-hole applications. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. Active alternatives with identical electrical and mechanical specifications are available from Littelfuse's current product lines, enabling seamless integration into existing designs without circuit modification.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	22 V
Current - Surge	500 A
Maximum AC Volts	14 V
Maximum DC Volts	18 V
Energy	2 J
Capacitance @ 1 MHz	4500 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 10mm
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the V22ZS2 is determined by strict equivalence across electrical performance and mechanical form factor. All substitute parts maintain identical specifications for varistor voltage (19.8 V minimum to 24.2 V maximum, 22 V typical), surge current rating (500 A), energy absorption (2 J), capacitance (4500 pF @ 1 MHz), and operating temperature range (-55°C to 85°C). All substitutes use the same through-hole disc 10mm package and meet ROHS3 compliance requirements.

The substitute parts are grouped into two categories:

Direct Manufacturer Equivalent: V22ZS2P differs only in packaging format (Tape & Reel versus bulk) and product status (Active versus Obsolete), with all electrical and mechanical parameters identical.

Parametric Equivalents: V22ZS2PX2855, V22ZT2P, V22ZT2PX2855, V22ZU2P, and V22ZU2PX2855 maintain all electrical specifications and physical form factor but represent different series designations (ZS, ZT, ZU) within Littelfuse's varistor product line. These series variations do not affect circuit performance for this voltage and current rating.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Packaging	Varistor Voltage (Typ)	Surge Current	Energy	Operating Temp	RoHS Status	Inventory
V22ZS2	Littelfuse Inc.	ZS	Obsolete	Bulk	22 V	500 A	2 J	-55°C to 85°C	ROHS3	819 Pcs
V22ZS2P	Littelfuse Inc.	ZS	Active	Tape & Reel	22 V	500 A	2 J	-55°C to 85°C	ROHS3	678 Pcs
V22ZS2PX2855	Littelfuse	ZS	Active	Tape & Reel	22 V	500 A	2 J	-55°C to 85°C	ROHS3	981 Pcs
V22ZT2P	Littelfuse Inc.	ZT	Active	Tape & Reel	22 V	500 A	2 J	-55°C to 85°C	ROHS3	774 Pcs
V22ZT2PX2855	Littelfuse Inc.	ZT	Active	Tape & Reel	22 V	500 A	2 J	-55°C to 85°C	ROHS3	966 Pcs
V22ZU2P	Littelfuse Inc.	ZU	Active	Tape & Reel	22 V	500 A	2 J	-55°C to 85°C	ROHS3	863 Pcs
V22ZU2PX2855	Littelfuse Inc.	ZU	Active	Tape & Reel	22 V	500 A	2 J	-55°C to 85°C	ROHS3	1032 Pcs

Engineering Selection Recommendations

All substitute parts are manufactured by Littelfuse and carry Active product status, ensuring long-term availability and supply chain continuity. The primary distinction between substitutes is packaging format: V22ZS2P, V22ZS2PX2855, V22ZT2P, V22ZT2PX2855, V22ZU2P, and V22ZU2PX2855 are supplied in Tape & Reel format, suitable for automated assembly processes, whereas the original V22ZS2 was supplied in bulk packaging.

All substitute parts maintain ROHS3 compliance and identical electrical performance specifications. Selection among the ZS, ZT, and ZU series variants should be based on procurement availability and supply chain requirements, as all three series deliver equivalent circuit performance for this voltage and current rating.

Frequently Asked Questions (FAQ)

Q: Can V22ZS2P be used as a direct replacement for V22ZS2?

A: Yes. V22ZS2P is the direct equivalent with identical electrical and mechanical specifications. The only difference is packaging format: V22ZS2P uses Tape & Reel packaging while V22ZS2 uses bulk packaging. Both are through-hole disc 10mm components with 22 V typical varistor voltage and 500 A surge current rating.

Q: What is the difference between the ZS, ZT, and ZU series variants?

A: The ZS, ZT, and ZU designations represent different series within Littelfuse's varistor product line. For the 22 V, 500 A disc configuration, all three series are parametrically equivalent with identical electrical specifications and physical form factor. Series selection is based on procurement availability and supply chain considerations.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification, meeting environmental and regulatory requirements for electronic component manufacturing.

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

A: The X2855 suffix indicates a specific packaging or manufacturing variant within the Littelfuse product line. Parts with and without this suffix maintain identical electrical and mechanical specifications for this voltage and current rating.

Q: Can these varistors be used in automated assembly processes?

A: Yes. All substitute parts are available in Tape & Reel packaging format, which is standard for automated pick-and-place assembly equipment. The through-hole disc 10mm package is compatible with wave soldering and selective soldering processes.

Q: What is the operating temperature range for all substitute parts?

A: All substitute parts operate across the temperature range of -55°C to 85°C (TA), matching the original V22ZS2 specification.

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