Littelfuse V100ZT3 Equivalent & Substitute Parts

Part Overview

The Littelfuse V100ZT3 is a 100 V, 1.2 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. Active alternatives from Littelfuse maintain identical electrical and mechanical specifications while offering current product status and improved supply chain availability.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	100 V
Current - Surge	1.2 kA
Maximum DC Volts	81 V
Maximum AC Volts	60 V
Energy	5 J
Capacitance @ 1 MHz	600 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 7mm
Number of Circuits	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the V100ZT3 is determined by strict equivalence across all electrical and mechanical parameters. The following criteria define valid substitutes:

Varistor voltage range: 90 V (Min) to 110 V (Max), with 100 V typical
Surge current capacity: 1.2 kA
Energy dissipation: 5 J
Maximum DC voltage: 81 V
Maximum AC voltage: 60 V
Capacitance: 600 pF @ 1 MHz
Operating temperature: -55°C to 85°C
Mounting configuration: Through Hole
Package form factor: Disc 7mm
Circuit count: 1

All substitute parts listed maintain these specifications. Differences exist only in product series designation (ZT, ZS, ZU), packaging format (bulk versus tape & reel), and product status (obsolete versus active).

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Packaging	Varistor Voltage (Typ)	Surge Current	Max DC Volts	Max AC Volts	Energy	Operating Temp	RoHS Status	Inventory
V100ZT3	Littelfuse Inc.	ZT	Obsolete	Bulk	100 V	1.2 kA	81 V	60 V	5 J	-55°C to 85°C	ROHS3	1146 Pcs
V100ZT3P	Littelfuse Inc.	ZT	Active	Tape & Reel	100 V	1.2 kA	81 V	60 V	5 J	-55°C to 85°C	ROHS3	1073 Pcs
V100ZT3PX2855	Littelfuse Inc.	ZT	Active	Tape & Reel	100 V	1.2 kA	81 V	60 V	5 J	-55°C to 85°C	ROHS3	891 Pcs
V100ZS3P	Littelfuse Inc.	ZS	Active	Tape & Reel	100 V	1.2 kA	81 V	60 V	5 J	-55°C to 85°C	ROHS3	1140 Pcs
V100ZS3PX2855	Littelfuse Inc.	ZS	Active	Tape & Reel	100 V	1.2 kA	81 V	60 V	5 J	-55°C to 85°C	ROHS3	1020 Pcs
V100ZU3P	Littelfuse Inc.	ZU	Active	Tape & Reel	100 V	1.2 kA	81 V	60 V	5 J	-55°C to 85°C	ROHS3	686 Pcs
V100ZU3PX2855	Littelfuse Inc.	ZU	Active	Tape & Reel	100 V	1.2 kA	81 V	60 V	5 J	-55°C to 85°C	ROHS3	974 Pcs

Engineering Selection Recommendations

All listed substitute parts are direct electrical and mechanical equivalents to the V100ZT3. Selection among active alternatives should be based on the following factors:

Product Status: The V100ZT3 is obsolete. All substitute parts listed carry active product status, ensuring long-term availability and manufacturer support.

Packaging Format: The V100ZT3 is supplied in bulk packaging. Substitute parts are available in tape & reel format, which is standard for automated assembly processes. If bulk packaging is required, contact the manufacturer for availability.

Series Variants: The ZT, ZS, and ZU series designations represent different product lines within Littelfuse's varistor portfolio. All three series maintain identical electrical specifications for the 100 V, 1.2 kA configuration.

Compliance: All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original component's environmental certifications.

Supply Availability: Active parts demonstrate current inventory levels ranging from 686 to 1140 pieces, providing reliable sourcing compared to the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for the V100ZT3?

A: Yes. All listed parts maintain identical electrical specifications (100 V varistor voltage, 1.2 kA surge current, 5 J energy, 81 V maximum DC, 60 V maximum AC) and mechanical form factor (through-hole, disc 7mm package). The primary difference is product status (active versus obsolete) and packaging format (tape & reel versus bulk).

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

A: Series designation indicates the product line within Littelfuse's varistor portfolio. For the 100 V, 1.2 kA specification, all three series are electrically and mechanically equivalent. Series selection does not affect circuit performance or compatibility.

Q: Does the "PX2855" suffix affect compatibility?

A: No. The PX2855 suffix indicates a specific manufacturing or packaging variant but does not alter electrical or mechanical specifications. Parts with and without this suffix are functionally equivalent.

Q: Why is the original V100ZT3 listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Active alternatives ensure continued availability for new designs and replacement applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental certifications of the original V100ZT3.

Q: Can I mix packaging formats in the same assembly?

A: Bulk and tape & reel formats contain identical components. Mixing formats is acceptable from an electrical and mechanical standpoint, though automated assembly processes typically require consistent packaging for efficiency.

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