Littelfuse V22ZA3 Varistor: Equivalent & Substitute Parts

Part Overview

The Littelfuse V22ZA3 is a 22 V, 1 kA 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 production and maintenance requirements. The V22ZA3 operates across a temperature range of -55°C to 85°C and is ROHS3 compliant. Active equivalent models from Littelfuse provide direct functional replacement with improved availability.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	22 V
Current - Surge	1 kA
Maximum AC Volts	14 V
Maximum DC Volts	18 V
Energy	4 J
Capacitance @ 1 MHz	14730 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 14mm
Number of Circuits	1

Substitute Part Grouping Explanation

Substitution for the V22ZA3 is determined by strict equivalence across all electrical and mechanical parameters. The following criteria establish valid substitutes:

Varistor voltage range: 19.8 V (minimum) to 24.2 V (maximum)
Surge current rating: 1 kA
Energy dissipation: 4 J
Capacitance: 14730 pF @ 1 MHz
Operating temperature: -55°C to 85°C
Mounting configuration: Through hole, disc 14mm package
Compliance: ROHS3 compliant, MSL 1

All substitute parts listed maintain identical electrical performance and physical form factor. Differences exist only in series designation (ZA versus ZC) and packaging configuration (tape reel versus bulk), which do not affect functional equivalence.

Parameter Comparison

Part Number	Manufacturer	Series	Status	Varistor Voltage (Typ)	Surge Current	Energy	Capacitance @ 1 MHz	Temp Range	Package	Inventory (Pcs)
V22ZA3	Littelfuse Inc.	ZA	Obsolete	22 V	1 kA	4 J	14730 pF	-55°C to 85°C	Disc 14mm	897
V22ZA3P	Littelfuse Inc.	ZA	Active	22 V	1 kA	4 J	14730 pF	-55°C to 85°C	Disc 14mm	1372
V22ZA3PX1347	Littelfuse Inc.	ZA	Active	22 V	1 kA	4 J	14730 pF	-55°C to 85°C	Disc 14mm	790
V22ZA3PX2855	Littelfuse Inc.	ZA	Active	22 V	1 kA	4 J	14730 pF	-55°C to 85°C	Disc 14mm	914
V22ZC3P	Littelfuse Inc.	ZC	Active	22 V	1 kA	4 J	14730 pF	-55°C to 85°C	Disc 14mm	2700
V22ZC3PX1347	Littelfuse Inc.	ZC	Active	22 V	1 kA	4 J	14730 pF	-55°C to 85°C	Disc 14mm	1085
V22ZC3PX2855	Littelfuse Inc.	ZC	Active	22 V	1 kA	4 J	14730 pF	-55°C to 85°C	Disc 14mm	1125

Engineering Selection Recommendations

The V22ZA3 is obsolete; direct replacement with active equivalents is required for new production. Selection among available substitutes depends on supply chain and packaging requirements:

Primary Recommendation: V22ZA3P (ZA series, bulk packaging) provides direct series continuity with the obsolete part and maintains identical electrical specifications. This part is active with 1372 units in stock.

Alternative Options: V22ZC3P and related variants (ZC series) offer equivalent electrical performance with higher inventory availability (2700 units). The ZC series represents a newer product line with identical parametric ratings and compliance certifications.

Packaging Variants: Parts designated with X1347 or X2855 suffixes indicate different tape reel configurations. These variants are functionally equivalent to their base part numbers and differ only in packaging format for automated assembly.

All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can V22ZC3P replace V22ZA3 directly? A: Yes. The V22ZC3P is a parametric equivalent with identical electrical ratings (22 V varistor voltage, 1 kA surge current, 4 J energy) and physical form factor (disc 14mm through-hole). The series designation change (ZA to ZC) reflects product line evolution but does not affect functional performance.

Q: What is the difference between V22ZA3P and V22ZA3PX1347? A: Both parts are electrically and mechanically identical. The X1347 and X2855 suffixes indicate different tape reel configurations for automated pick-and-place assembly. Selection depends on your assembly equipment compatibility, not on electrical performance.

Q: Is the V22ZA3 still available? A: The V22ZA3 is classified as obsolete. However, 897 units remain in stock. For new designs and ongoing production, active equivalents (V22ZA3P, V22ZC3P, and variants) are recommended to ensure long-term supply continuity.

Q: Are all substitutes ROHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity level), matching the compliance profile of the original V22ZA3.

Q: Which substitute has the best availability? A: V22ZC3P offers the highest inventory with 2700 units in stock, followed by V22ZA3P with 1372 units. Both are active products suitable for immediate procurement.

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