V8ZT05 Equivalent & Substitute Parts

Part Overview

The V8ZT05 is an 8.5 V 50 A varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole disc 5mm packaging. 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 across multiple series designations.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	8.5 V
Current - Surge	50 A
Maximum DC Volts	5.5 V
Maximum AC Volts	4 V
Energy	0.1 J
Capacitance @ 1 MHz	2000 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 5mm
Number of Circuits	1

Substitute Part Grouping Explanation

Substitution of the V8ZT05 is determined by strict equivalence across the following parameters: varistor voltage range (6 V minimum to 11 V maximum, 8.5 V typical), surge current rating (50 A), maximum DC and AC voltage ratings, energy dissipation capacity (0.1 J), capacitance characteristics (2000 pF @ 1 MHz), operating temperature range (-55°C to 85°C), and physical form factor (through-hole disc 5mm). All substitute parts listed maintain identical electrical performance and mechanical compatibility with the original V8ZT05 specification.

Substitute parts are differentiated by series designation (ZT, ZS, ZU) and packaging configuration (bulk or tape & reel with X2855 designation). These variations do not affect electrical or mechanical compatibility; they represent manufacturing series evolution and distribution packaging options within the Littelfuse varistor product line.

Parameter Comparison

Part Number	Manufacturer	Series	Status	Packaging	Varistor Voltage (Typ)	Surge Current	Max DC Volts	Max AC Volts	Energy	Capacitance @ 1 MHz	Operating Temp	Package Type	RoHS
V8ZT05	Littelfuse Inc.	ZT	Obsolete	Bulk	8.5 V	50 A	5.5 V	4 V	0.1 J	2000 pF	-55°C to 85°C	Disc 5mm	ROHS3
V8ZT05P	Littelfuse Inc.	ZT	Active	Tape & Reel	8.5 V	50 A	5.5 V	4 V	0.1 J	2000 pF	-55°C to 85°C	Disc 5mm	ROHS3
V8ZS05P	Littelfuse Inc.	ZS	Active	Tape & Reel	8.5 V	50 A	5.5 V	4 V	0.1 J	2000 pF	-55°C to 85°C	Disc 5mm	ROHS3
V8ZS05PX2855	Littelfuse Inc.	ZS	Active	Tape & Reel	8.5 V	50 A	5.5 V	4 V	0.1 J	2000 pF	-55°C to 85°C	Disc 5mm	ROHS3
V8ZT05PX2855	Littelfuse Inc.	ZT	Active	Tape & Reel	8.5 V	50 A	5.5 V	4 V	0.1 J	2000 pF	-55°C to 85°C	Disc 5mm	ROHS3
V8ZU05P	Littelfuse Inc.	ZU	Active	Tape & Reel	8.5 V	50 A	5.5 V	4 V	0.1 J	2000 pF	-55°C to 85°C	Disc 5mm	ROHS3
V8ZU05PX2855	Littelfuse Inc.	ZU	Active	Tape & Reel	8.5 V	50 A	5.5 V	4 V	0.1 J	2000 pF	-55°C to 85°C	Disc 5mm	ROHS3

Engineering Selection Recommendations

All substitute parts maintain full electrical and mechanical equivalence to the V8ZT05. Selection among active alternatives should be based on procurement requirements and packaging format:

V8ZT05P is the direct series equivalent in active production status with tape & reel packaging, suitable for automated assembly processes.

V8ZS05P and V8ZS05PX2855 represent the ZS series alternative with identical electrical specifications and REACH compliance documentation.

V8ZT05PX2855 maintains the original ZT series designation with X2855 packaging specification for tape & reel distribution.

V8ZU05P and V8ZU05PX2855 represent the ZU series alternative, providing additional supply chain flexibility.

All parts carry ROHS3 compliance and are classified as REACH unaffected, meeting current regulatory requirements for electronic component procurement.

Frequently Asked Questions (FAQ)

Q: Can V8ZT05P be used as a direct replacement for V8ZT05?

A: Yes. V8ZT05P is electrically and mechanically identical to V8ZT05, with the primary difference being active production status and tape & reel packaging format instead of bulk packaging.

Q: What is the difference between V8ZT05P and V8ZS05P?

A: Both parts are parametrically equivalent with identical electrical ratings and physical form factor. The difference is the series designation (ZT versus ZS), representing different manufacturing series within the Littelfuse varistor product line. Both are active production parts.

Q: Does the X2855 designation affect electrical performance?

A: No. The X2855 designation indicates a specific tape & reel packaging specification. Electrical and mechanical parameters remain unchanged.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, provided the original design uses through-hole assembly. All substitute parts maintain identical varistor voltage, surge current rating, capacitance, and operating temperature specifications. Physical form factor (disc 5mm through-hole) is consistent across all parts.

Q: Which substitute part should be selected for new designs?

A: V8ZT05P, V8ZS05P, or V8ZU05P are recommended for new designs, as all are in active production status. Selection among these three should be based on supply chain availability and internal procurement preferences, as electrical performance is identical.

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