Littelfuse V68ZS3 Equivalent & Substitute Parts

Part Overview

The Littelfuse V68ZS3 is a 68 V 500 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 design support and procurement. Active alternatives with identical electrical and mechanical specifications are available from Littelfuse's current product portfolio.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	68 V
Current - Surge	500 A
Maximum AC Volts	40 V
Maximum DC Volts	56 V
Energy	6.5 J
Mounting Type	Through Hole
Package / Case	Disc 10mm
Operating Temperature Range	-55°C ~ 85°C
Capacitance @ 1 MHz	1850 pF
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the V68ZS3 is based on strict electrical and mechanical parameter matching. All substitute parts maintain identical specifications across the following critical parameters:

Varistor voltage range: 61.2 V (Min) to 74.8 V (Max), with 68 V typical
Surge current capacity: 500 A
Energy dissipation: 6.5 J
AC/DC voltage ratings: 40 V AC / 56 V DC maximum
Mounting configuration: Through-hole disc 10mm
Operating temperature: -55°C to 85°C
Capacitance: 1850 pF @ 1 MHz

Substitute parts are differentiated by series designation (ZS, ZT, ZU) and packaging format (bulk or tape & reel). All listed substitutes are active products with current manufacturing status and full compliance certifications.

Parameter Comparison

Part Number	Manufacturer	Series	Packaging	Product Status	Varistor Voltage (Typ)	Surge Current	Energy	Max AC / DC Volts	Operating Temp	RoHS Status
V68ZS3	Littelfuse Inc.	ZS	Bulk	Obsolete	68 V	500 A	6.5 J	40 V / 56 V	-55°C ~ 85°C	ROHS3
V68ZS3P	Littelfuse	ZS	Tape & Reel	Active	68 V	500 A	6.5 J	40 V / 56 V	-55°C ~ 85°C	ROHS3
V68ZS3PX2855	Littelfuse Inc.	ZS	Tape & Reel	Active	68 V	500 A	6.5 J	40 V / 56 V	-55°C ~ 85°C	ROHS3
V68ZT3P	Littelfuse Inc.	ZT	Tape & Reel	Active	68 V	500 A	6.5 J	40 V / 56 V	-55°C ~ 85°C	ROHS3
V68ZT3PX2855	Littelfuse Inc.	ZT	Tape & Reel	Active	68 V	500 A	6.5 J	40 V / 56 V	-55°C ~ 85°C	ROHS3
V68ZU3P	Littelfuse Inc.	ZU	Tape & Reel	Active	68 V	500 A	6.5 J	40 V / 56 V	-55°C ~ 85°C	ROHS3
V68ZU3PX2855	Littelfuse Inc.	ZU	Tape & Reel	Active	68 V	500 A	6.5 J	40 V / 56 V	-55°C ~ 85°C	ROHS3

Engineering Selection Recommendations

All substitute parts listed are active products manufactured by Littelfuse Inc. and maintain full ROHS3 compliance with moisture sensitivity level 1 (unlimited). The primary distinction between substitutes is packaging format and series designation.

For applications requiring tape & reel packaging for automated assembly, V68ZS3P, V68ZS3PX2855, V68ZT3P, V68ZT3PX2855, V68ZU3P, and V68ZU3PX2855 are suitable direct replacements. Series variants (ZS, ZT, ZU) are electrically and mechanically equivalent and may be selected based on availability and supply chain requirements.

All substitute parts maintain identical electrical performance, thermal characteristics, and regulatory compliance status relative to the obsolete V68ZS3.

Frequently Asked Questions (FAQ)

Q: Can I use V68ZS3P as a direct replacement for V68ZS3?

A: Yes. V68ZS3P is electrically and mechanically identical to V68ZS3. The primary difference is packaging format: V68ZS3P is supplied in tape & reel format suitable for automated assembly, while V68ZS3 is bulk packaged. Both maintain identical electrical specifications and compliance certifications.

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

A: All three series (ZS, ZT, ZU) are parametrically equivalent for the 68 V 500 A varistor specification. Series designation reflects internal manufacturing or design revision but does not affect electrical or mechanical performance. Selection may be based on availability and procurement requirements.

Q: Are the X2855 suffix variants functionally different?

A: No. The X2855 suffix indicates a specific manufacturing or packaging configuration but does not alter electrical specifications or performance characteristics. Parts with and without the X2855 suffix are functionally equivalent.

Q: What packaging formats are available?

A: The V68ZS3 is available in bulk packaging (V68ZS3). All active substitutes are supplied in tape & reel format (indicated by the "P" suffix), which is standard for automated assembly processes.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and moisture sensitivity level 1 (unlimited), matching the compliance profile of the original V68ZS3.

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