Littelfuse V18ZA05 Equivalent & Substitute Parts

Part Overview

The Littelfuse V18ZA05 is an 18 V, 100 A varistor in a through-hole disc 5mm package, designed for transient voltage suppression applications. This part 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 the same manufacturer.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	18 V
Current - Surge	100 A
Maximum AC Volts	10 V
Maximum DC Volts	14 V
Energy	0.17 J
Capacitance @ 1 MHz	1400 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 5mm
Number of Circuits	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the V18ZA05 are qualified based on matching all critical electrical and mechanical parameters: varistor voltage range (16.2 V minimum to 19.8 V maximum), surge current rating (100 A), maximum AC and DC voltage ratings, energy dissipation capacity (0.17 J), capacitance at 1 MHz (1400 pF), operating temperature range (-55°C to 85°C), through-hole mounting configuration, and disc 5mm package form factor. All substitute parts maintain ROHS3 compliance and MSL 1 rating.

The substitute parts are grouped into two categories:

Direct Manufacturer Equivalents (Same Series ZA): Parts with identical series designation and packaging configuration, differing only in product status or packaging format.

Parametric Equivalents (Series ZC): Parts from an alternative series within the same manufacturer portfolio that maintain all specified electrical and mechanical parameters while offering active product status.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Varistor Voltage (Typ)	Current - Surge	Max AC Volts	Max DC Volts	Energy	Capacitance @ 1 MHz	Operating Temp	Package	RoHS Status	Inventory
V18ZA05	Littelfuse Inc.	ZA	Obsolete	18 V	100 A	10 V	14 V	0.17 J	1400 pF	-55°C ~ 85°C	Disc 5mm	ROHS3 Compliant	751 Pcs
V18ZA05P	Littelfuse Inc.	ZA	Active	18 V	100 A	10 V	14 V	0.17 J	1400 pF	-55°C ~ 85°C	Disc 5mm	ROHS3 Compliant	3470 Pcs
V18ZA05PX2855	Littelfuse Inc.	ZA	Active	18 V	100 A	10 V	14 V	0.17 J	1400 pF	-55°C ~ 85°C	Disc 5mm	ROHS3 Compliant	673 Pcs
V18ZC05P	Littelfuse Inc.	ZC	Active	18 V	100 A	10 V	14 V	0.17 J	1400 pF	-55°C ~ 85°C	Disc 5mm	ROHS3 Compliant	979 Pcs
V18ZC05PX2855	Littelfuse Inc.	ZC	Active	18 V	100 A	10 V	14 V	0.17 J	1400 pF	-55°C ~ 85°C	Disc 5mm	ROHS3 Compliant	906 Pcs

Engineering Selection Recommendations

All substitute parts maintain full electrical and mechanical compatibility with the V18ZA05. Selection should prioritize active product status parts to ensure long-term availability and manufacturing support.

V18ZA05P and V18ZA05PX2855 are direct series equivalents with active status, offering the most direct replacement path. The designation suffix "P" indicates bulk packaging, while "X2855" represents an alternative packaging configuration. Both maintain identical electrical performance and thermal characteristics.

V18ZC05P and V18ZC05PX2855 are parametric equivalents from the ZC series, also with active status. These parts satisfy all specified electrical and mechanical requirements and are suitable for direct substitution in circuit designs.

All substitute parts carry ROHS3 compliance and MSL 1 rating, matching the original part's environmental and regulatory qualifications.

Frequently Asked Questions (FAQ)

Q: Can V18ZA05P directly replace the obsolete V18ZA05?

A: Yes. V18ZA05P is an active equivalent with identical electrical specifications, varistor voltage range, surge current rating, and disc 5mm through-hole package configuration. The only difference is product status (active vs. obsolete) and packaging format (bulk).

Q: What is the difference between V18ZA05P and V18ZA05PX2855?

A: Both parts are from the ZA series with identical electrical and mechanical parameters. The X2855 designation indicates an alternative packaging configuration. Electrical performance and circuit compatibility are equivalent.

Q: Are the ZC series parts (V18ZC05P, V18ZC05PX2855) suitable replacements?

A: Yes. The ZC series parts maintain all specified electrical parameters: 18 V typical varistor voltage, 100 A surge current, 0.17 J energy rating, and 1400 pF capacitance at 1 MHz. They are housed in the same disc 5mm through-hole package and operate across the identical temperature range.

Q: Does the series designation (ZA vs. ZC) affect circuit performance?

A: No. Both series are qualified as parametric equivalents based on matching all critical electrical and mechanical specifications provided for this application. Series designation does not indicate functional differences for the specified parameters.

Q: Which substitute part offers the best availability?

A: V18ZA05P offers the highest inventory level (3470 Pcs), followed by V18ZC05PX2855 (906 Pcs) and V18ZC05P (979 Pcs). All parts are in active production status.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts carry ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original V18ZA05 specifications.

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