Littelfuse V68ZT2 68V 250A Disc Varistor Equivalent & Substitute Parts

Part Overview

The Littelfuse V68ZT2 is a 68 V 250 A transient voltage suppressor varistor in a through-hole disc 7mm package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The V68ZT2 belongs to the ZT series and is designed for single-circuit transient voltage suppression applications with a maximum surge current rating of 250 A and energy dissipation capability of 3 J.

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 Dissipation	3 J
Number of Circuits	1
Capacitance @ 1 MHz	910 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 7mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the V68ZT2 are qualified based on strict electrical and mechanical parameter equivalence. All substitute parts maintain identical specifications across the following critical parameters:

Varistor voltage rating: 68 V (61.2 V minimum to 74.8 V maximum)
Surge current capacity: 250 A
Energy dissipation: 3 J
Single-circuit configuration
Through-hole disc 7mm package
Operating temperature range: -55°C to 85°C
Maximum AC/DC voltage ratings: 40 V AC / 56 V DC
Capacitance: 910 pF @ 1 MHz
RoHS3 compliance and MSL 1 rating

Substitutes are differentiated by series designation (ZT, ZS, ZU), product status (active vs. obsolete), and packaging format (bulk, cut tape, or tape & reel). All listed substitutes are manufactured by Littelfuse Inc. and meet identical electrical performance requirements.

Parameter Comparison

Part Number	Series	Packaging	Product Status	Varistor Voltage (Typ)	Surge Current	Energy	Max AC / DC Volts	Inventory (Pcs)
V68ZT2	ZT	Disc 7mm	Obsolete	68 V	250 A	3 J	40 V / 56 V	723
V68ZT2P	ZT	Tape & Reel (TR)	Active	68 V	250 A	3 J	40 V / 56 V	1082
V68ZT2PX2855	ZT	Tape & Reel (TR)	Active	68 V	250 A	3 J	40 V / 56 V	917
V68ZS2P	ZS	Cut Tape (CT)	Active	68 V	250 A	3 J	40 V / 56 V	63200
V68ZS2PX2855	ZS	Tape & Reel (TR)	Active	68 V	250 A	3 J	40 V / 56 V	1158
V68ZU2P	ZU	Tape & Reel (TR)	Active	68 V	250 A	3 J	40 V / 56 V	1011
V68ZU2PX2855	ZU	Tape & Reel (TR)	Active	68 V	250 A	3 J	40 V / 56 V	978

Engineering Selection Recommendations

All substitute parts listed are active products manufactured by Littelfuse Inc. and carry ROHS3 compliance with REACH unaffected status, ensuring regulatory alignment for current and future applications. The V68ZT2 original part is obsolete; therefore, selection of an active substitute is necessary for new designs and ongoing procurement.

For high-volume applications, V68ZS2P in cut tape format offers the largest available inventory (63,200 pcs). For automated assembly processes requiring tape & reel packaging, V68ZT2P, V68ZT2PX2855, V68ZS2PX2855, V68ZU2P, and V68ZU2PX2855 are all suitable options with comparable stock levels.

Series designation (ZT, ZS, ZU) represents internal Littelfuse manufacturing variants and does not affect electrical performance or mechanical compatibility. Selection between series should be based on procurement availability and lead time requirements.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for the V68ZT2?

A: Yes. All listed substitute parts maintain identical electrical specifications (68 V varistor voltage, 250 A surge current, 3 J energy dissipation) and mechanical form factor (through-hole disc 7mm). The primary difference is product status (active vs. obsolete) and packaging format.

Q: What is the difference between cut tape (CT) and tape & reel (TR) packaging?

A: Cut tape packaging is supplied in continuous strips and is suitable for manual or semi-automated assembly. Tape & reel packaging is wound on reels for fully automated pick-and-place assembly systems. Electrical and mechanical specifications are identical; packaging selection depends on assembly process requirements.

Q: Why are there multiple series designations (ZT, ZS, ZU) for the same electrical specifications?

A: Series designation reflects internal Littelfuse manufacturing lines and process variants. All three series meet identical electrical and mechanical requirements for the 68 V 250 A varistor specification. Selection between series should be based on availability and procurement lead times.

Q: Is the V68ZS2P with 63,200 pcs inventory the recommended choice?

A: High inventory availability indicates strong market support and shorter lead times. However, selection should align with your assembly process (manual vs. automated) and packaging requirements (cut tape vs. tape & reel).

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements.

Q: Can I mix packaging formats in a single production run?

A: Yes. All substitute parts are electrically and mechanically identical. Mixing packaging formats is permissible if your assembly process can accommodate both cut tape and tape & reel inputs.

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