Littelfuse V68ZS2 Varistor: Equivalent & Substitute Parts

Part Overview

The Littelfuse V68ZS2 is a 68 V, 250 A disc varistor designed for transient voltage suppression in through-hole applications. This part is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance requirements. Active alternatives from Littelfuse maintain identical electrical and mechanical specifications while offering improved availability and current product support.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	68 V
Varistor Voltage Range	61.2 V (Min) – 74.8 V (Max)
Current - Surge	250 A
Maximum AC Volts	40 V
Maximum DC Volts	56 V
Energy	3 J
Capacitance @ 1 MHz	910 pF
Operating Temperature Range	-55°C to 85°C
Package / Case	Disc 7mm
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

All substitute parts for the V68ZS2 maintain identical electrical performance parameters: 68 V typical varistor voltage (61.2 V – 74.8 V range), 250 A surge current, 3 J energy rating, and 910 pF capacitance at 1 MHz. The substitution logic is based on these core electrical specifications combined with mechanical compatibility (through-hole disc 7mm package) and environmental compliance (ROHS3, operating temperature -55°C to 85°C).

Substitutes are differentiated by series designation (ZS, ZT, ZU) and packaging format (Cut Tape, Tape & Reel). All alternatives are active products with current manufacturer support, eliminating obsolescence risk associated with the original V68ZS2.

Parameter Comparison

Part Number	Manufacturer	Series	Packaging	Product Status	Varistor Voltage (Typ)	Surge Current	Energy	Package / Case	RoHS Status
V68ZS2	Littelfuse Inc.	ZS	Bulk	Obsolete	68 V	250 A	3 J	Disc 7mm	ROHS3 Compliant
V68ZS2P	Littelfuse	ZS	Cut Tape (CT)	Active	68 V	250 A	3 J	Disc 7mm	ROHS3 Compliant
V68ZS2PX2855	Littelfuse Inc.	ZS	Tape & Reel (TR)	Active	68 V	250 A	3 J	Disc 7mm	ROHS3 Compliant
V68ZT2P	Littelfuse Inc.	ZT	Tape & Reel (TR)	Active	68 V	250 A	3 J	Disc 7mm	ROHS3 Compliant
V68ZT2PX2855	Littelfuse Inc.	ZT	Tape & Reel (TR)	Active	68 V	250 A	3 J	Disc 7mm	ROHS3 Compliant
V68ZU2P	Littelfuse Inc.	ZU	Tape & Reel (TR)	Active	68 V	250 A	3 J	Disc 7mm	ROHS3 Compliant
V68ZU2PX2855	Littelfuse Inc.	ZU	Tape & Reel (TR)	Active	68 V	250 A	3 J	Disc 7mm	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently using the obsolete V68ZS2, direct substitution is supported by V68ZS2P (Cut Tape packaging) and V68ZS2PX2855 (Tape & Reel packaging). Both maintain identical electrical and mechanical specifications while offering active product status and full ROHS3 compliance.

Series variants V68ZT2P, V68ZT2PX2855, V68ZU2P, and V68ZU2PX2855 provide equivalent electrical performance and are suitable for applications where series designation does not impose design constraints. All substitute parts operate within the same temperature range (-55°C to 85°C) and maintain MSL 1 (Unlimited) moisture sensitivity classification.

Packaging selection should align with assembly process requirements: Cut Tape (CT) format for manual or semi-automated placement, Tape & Reel (TR) format for high-volume automated assembly. The X2855 suffix indicates Tape & Reel packaging with specific reel configuration.

Frequently Asked Questions (FAQ)

Q: Can V68ZS2 be directly replaced with V68ZS2P? A: Yes. V68ZS2P maintains identical electrical specifications (68 V typical varistor voltage, 250 A surge current, 3 J energy) and mechanical form factor (disc 7mm through-hole). The difference is packaging format (Cut Tape versus bulk) and active product status.

Q: What is the difference between V68ZS2P and V68ZS2PX2855? A: Both parts are electrically and mechanically identical. V68ZS2PX2855 uses Tape & Reel packaging with X2855 reel configuration, while V68ZS2P uses Cut Tape packaging. Selection depends on assembly equipment compatibility.

Q: Are series variants (ZT, ZU) interchangeable with the original ZS series? A: Yes, for applications where series designation does not impose specific design or qualification requirements. All variants maintain identical electrical performance: 68 V varistor voltage, 250 A surge current, 3 J energy, and disc 7mm through-hole package.

Q: Do all substitute parts meet the same compliance standards? A: Yes. All substitute parts are ROHS3 compliant, operate across -55°C to 85°C temperature range, and carry MSL 1 (Unlimited) moisture sensitivity classification.

Q: Which substitute should be selected for new designs? A: V68ZS2P or V68ZS2PX2855 are recommended for new designs to maintain series consistency with the original specification. Packaging selection (Cut Tape or Tape & Reel) should align with manufacturing process requirements.

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