Littelfuse V8ZS2 Varistor 8.5V 250A Equivalent & Substitute Parts

Part Overview

The Littelfuse V8ZS2 is an 8.5 V 250 A varistor in a through-hole disc 10mm package, designed for transient voltage suppression applications. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance requirements. Active alternatives with identical electrical and mechanical specifications are available from Littelfuse's current product lines.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	8.5 V
Current - Surge	250 A
Maximum AC Volts	4 V
Maximum DC Volts	5.5 V
Energy	0.8 J
Capacitance @ 1 MHz	7000 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 10mm
Number of Circuits	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the V8ZS2 is based on strict equivalence across all electrical and mechanical parameters. The following criteria determine valid substitutes:

Varistor voltage range: 6 V (Min) to 11 V (Max), with 8.5 V typical
Surge current capacity: 250 A
Maximum AC and DC voltage ratings: 4 V AC / 5.5 V DC
Energy dissipation: 0.8 J
Capacitance: 7000 pF @ 1 MHz
Operating temperature: -55°C to 85°C
Mounting configuration: Through hole, disc 10mm package
Compliance: ROHS3 compliant

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

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Packaging	Varistor Voltage (Typ)	Surge Current	Max AC / DC Volts	Energy	Operating Temp	RoHS Status
V8ZS2	Littelfuse Inc.	ZS	Obsolete	Bulk	8.5 V	250 A	4 V / 5.5 V	0.8 J	-55°C to 85°C	ROHS3
V8ZS2P	Littelfuse Inc.	ZS	Active	Tape & Reel	8.5 V	250 A	4 V / 5.5 V	0.8 J	-55°C to 85°C	ROHS3
V8ZS2PX2855	Littelfuse Inc.	ZS	Active	Tape & Reel	8.5 V	250 A	4 V / 5.5 V	0.8 J	-55°C to 85°C	ROHS3
V8ZT2P	Littelfuse Inc.	ZT	Active	Tape & Reel	8.5 V	250 A	4 V / 5.5 V	0.8 J	-55°C to 85°C	ROHS3
V8ZT2PX2855	Littelfuse Inc.	ZT	Active	Tape & Reel	8.5 V	250 A	4 V / 5.5 V	0.8 J	-55°C to 85°C	ROHS3
V8ZU2P	Littelfuse Inc.	ZU	Active	Tape & Reel	8.5 V	250 A	4 V / 5.5 V	0.8 J	-55°C to 85°C	ROHS3
V8ZU2PX2855	Littelfuse Inc.	ZU	Active	Tape & Reel	8.5 V	250 A	4 V / 5.5 V	0.8 J	-55°C to 85°C	ROHS3

Engineering Selection Recommendations

All listed substitute parts are active products from Littelfuse Inc. and maintain full ROHS3 compliance with REACH unaffected status. The primary distinction between substitutes is packaging format and series designation.

For applications requiring tape & reel packaging for automated assembly, V8ZS2P, V8ZS2PX2855, V8ZT2P, V8ZT2PX2855, V8ZU2P, and V8ZU2PX2855 are suitable direct replacements. These parts are functionally equivalent to the obsolete V8ZS2 across all electrical parameters and operating conditions.

Series designation (ZS, ZT, ZU) reflects internal Littelfuse product line organization and does not affect electrical or mechanical compatibility. Selection among these series should be based on availability and supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can V8ZS2P be used as a direct replacement for V8ZS2?

A: Yes. V8ZS2P is electrically and mechanically identical to V8ZS2. The primary difference is packaging format: V8ZS2P is supplied in tape & reel format suitable for automated assembly, while V8ZS2 was supplied in bulk. Both maintain the same 8.5 V typical varistor voltage, 250 A surge current, and disc 10mm through-hole configuration.

Q: What is the difference between V8ZS2PX2855 and V8ZS2P?

A: Both parts are electrically identical with matching varistor voltage, surge current, and all electrical specifications. The X2855 designation indicates a specific packaging or manufacturing variant within the same series. No functional difference exists for circuit design purposes.

Q: Are V8ZT2P and V8ZU2P compatible with V8ZS2?

A: Yes. V8ZT2P and V8ZU2P maintain identical electrical specifications and mechanical configuration to V8ZS2. The series designation (ZT and ZU versus ZS) reflects product line organization only and does not affect performance or compatibility.

Q: What packaging format should I select for high-volume production?

A: Tape & reel packaging (indicated by the "P" suffix in part numbers V8ZS2P, V8ZT2P, V8ZU2P, and their X2855 variants) is standard for automated assembly processes. Bulk packaging is no longer available for this product line.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

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