V8ZT1 Equivalent & Substitute Parts

Part Overview

The V8ZT1 is an 8.5 V, 100 A varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole applications. This component features a disc 7mm package and is rated for single-circuit protection with 0.4 J energy absorption capability. The V8ZT1 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Active alternatives with identical electrical and mechanical specifications are available from Littelfuse's current product portfolio.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	8.5 V
Current - Surge	100 A
Maximum AC Volts	4 V
Maximum DC Volts	5.5 V
Energy	0.4 J
Capacitance @ 1 MHz	4190 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 7mm
Number of Circuits	1

Substitute Part Grouping Explanation

Substitution of the V8ZT1 is determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters must remain identical for direct substitution:

Varistor Voltage range (Min: 6 V, Typ: 8.5 V, Max: 11 V)
Current - Surge rating (100 A)
Maximum AC and DC voltage ratings (4 V AC, 5.5 V DC)
Energy absorption (0.4 J)
Capacitance at 1 MHz (4190 pF)
Operating temperature range (-55°C to 85°C)
Mounting type (Through Hole)
Package form factor (Disc 7mm)
Number of circuits (1)

All substitute parts listed below meet these criteria. Packaging format (bulk, cut tape, or tape & reel) does not affect electrical or mechanical compatibility and may be selected based on procurement and assembly requirements.

Parameter Comparison

Part Number	Manufacturer	Series	Status	Packaging	Varistor Voltage (Typ)	Surge Current	Max AC / DC	Energy	Capacitance @ 1 MHz	Operating Temp	Package Type
V8ZT1	Littelfuse Inc.	ZT	Obsolete	Bulk	8.5 V	100 A	4 V / 5.5 V	0.4 J	4190 pF	-55°C to 85°C	Disc 7mm
V8ZT1P	Littelfuse Inc.	ZT	Active	Tape & Reel (TR)	8.5 V	100 A	4 V / 5.5 V	0.4 J	4190 pF	-55°C to 85°C	Disc 7mm
V8ZT1PX2855	Littelfuse Inc.	ZT	Active	Tape & Reel (TR)	8.5 V	100 A	4 V / 5.5 V	0.4 J	4190 pF	-55°C to 85°C	Disc 7mm
V8ZS1P	Littelfuse Inc.	ZS	Active	Cut Tape (CT)	8.5 V	100 A	4 V / 5.5 V	0.4 J	4190 pF	-55°C to 85°C	Disc 7mm
V8ZS1PX2855	Littelfuse Inc.	ZS	Active	Tape & Reel (TR)	8.5 V	100 A	4 V / 5.5 V	0.4 J	4190 pF	-55°C to 85°C	Disc 7mm
V8ZU1P	Littelfuse Inc.	ZU	Active	Tape & Reel (TR)	8.5 V	100 A	4 V / 5.5 V	0.4 J	4190 pF	-55°C to 85°C	Disc 7mm
V8ZU1PX2855	Littelfuse Inc.	ZU	Active	Tape & Reel (TR)	8.5 V	100 A	4 V / 5.5 V	0.4 J	4190 pF	-55°C to 85°C	Disc 7mm

Engineering Selection Recommendations

All substitute parts listed are manufactured by Littelfuse Inc. and maintain full electrical and mechanical equivalence to the V8ZT1. Selection among available alternatives should be based on the following factors:

Product Status: The V8ZT1 is obsolete. All substitute parts carry active product status, ensuring continued availability and manufacturing support.

Compliance and Certifications: All parts are ROHS3 compliant with MSL rating of 1 (Unlimited). Active substitutes carry REACH Unaffected status, confirming regulatory compliance for current procurement.

Packaging Considerations: Packaging format does not affect component performance. Selection depends on assembly process requirements:

Tape & Reel (TR) packaging suits automated pick-and-place assembly
Cut Tape (CT) packaging accommodates manual or semi-automated processes
Bulk packaging is available only for the obsolete V8ZT1

Series Variants: The ZT, ZS, and ZU series designations represent manufacturing variants within Littelfuse's varistor portfolio. All variants maintain identical electrical specifications and are fully interchangeable for this application.

Frequently Asked Questions (FAQ)

Q: Can V8ZT1 substitutes be used interchangeably in existing designs? A: Yes. All listed substitute parts maintain identical electrical and mechanical parameters, including varistor voltage, surge current rating, voltage limits, energy absorption, capacitance, and operating temperature range. Through-hole mounting and disc 7mm package form factor are preserved across all alternatives.

Q: What is the difference between V8ZT1P, V8ZS1P, and V8ZU1P? A: These parts differ only in series designation (ZT, ZS, ZU) and packaging format. Electrical specifications and mechanical dimensions are identical. Series variants represent different manufacturing lines within Littelfuse's product range and do not affect performance or compatibility.

Q: Does packaging format affect electrical performance? A: No. Tape & Reel (TR), Cut Tape (CT), and bulk packaging formats are logistics and assembly considerations only. Electrical and mechanical specifications remain unchanged regardless of packaging selection.

Q: Are all substitutes ROHS3 compliant? A: Yes. The V8ZT1 and all substitute parts are ROHS3 compliant with MSL rating 1 (Unlimited). Active substitutes additionally carry REACH Unaffected certification.

Q: What inventory levels are available for each substitute? A: Current inventory for active substitutes ranges from 678 to 13,377 pieces. V8ZS1P maintains the highest stock level at 13,377 pieces. Specific availability should be confirmed with the component supplier.

Q: Can the V8ZT1PX2855 variant replace V8ZT1P? A: Yes. Both parts are electrically and mechanically identical. The X2855 designation indicates a specific tape reel configuration. Selection between V8ZT1P and V8ZT1PX2855 depends on assembly equipment compatibility and procurement requirements.

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