V68ZT05 Equivalent & Substitute Parts

Part Overview

The V68ZT05 is a 68 V, 100 A disc varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole applications. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The varistor provides single-circuit protection with a typical varistor voltage of 68 V and energy rating of 0.6 J, suitable for applications requiring reliable overvoltage clamping in the specified voltage range.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	68 V
Current - Surge	100 A
Maximum DC Volts	56 V
Maximum AC Volts	40 V
Energy	0.6 J
Operating Temperature Range	-55°C to 85°C
Capacitance @ 1 MHz	400 pF
Number of Circuits	1
Package / Case	Disc 5mm
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the V68ZT05 is determined by strict equivalence across electrical and mechanical parameters. All substitute parts maintain identical varistor voltage specifications (61.2 V minimum to 74.8 V maximum), surge current rating (100 A), energy dissipation (0.6 J), operating temperature range (-55°C to 85°C), and physical form factor (Disc 5mm through-hole). Substitutes are grouped into two categories: direct packaging equivalents and parametric equivalents across different series designations (ZT, ZS, ZU). The key differentiator is product status and packaging configuration (bulk versus tape & reel), not electrical performance.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Packaging	Varistor Voltage (Typ)	Current - Surge	Max DC Volts	Max AC Volts	Energy	Operating Temp	RoHS Status
V68ZT05	Littelfuse Inc.	ZT	Obsolete	Bulk	68 V	100 A	56 V	40 V	0.6 J	-55°C to 85°C	ROHS3
V68ZT05P	Littelfuse Inc.	ZT	Active	Tape & Reel	68 V	100 A	56 V	40 V	0.6 J	-55°C to 85°C	ROHS3
V68ZT05PX2855	Littelfuse Inc.	ZT	Active	Tape & Reel	68 V	100 A	56 V	40 V	0.6 J	-55°C to 85°C	ROHS3
V68ZS05P	Littelfuse Inc.	ZS	Active	Tape & Reel	68 V	100 A	56 V	40 V	0.6 J	-55°C to 85°C	ROHS3
V68ZS05PX2855	Littelfuse Inc.	ZS	Active	Tape & Reel	68 V	100 A	56 V	40 V	0.6 J	-55°C to 85°C	ROHS3
V68ZU05P	Littelfuse Inc.	ZU	Active	Tape & Reel	68 V	100 A	56 V	40 V	0.6 J	-55°C to 85°C	ROHS3
V68ZU05PX2855	Littelfuse Inc.	ZU	Active	Tape & Reel	68 V	100 A	56 V	40 V	0.6 J	-55°C to 85°C	ROHS3

Engineering Selection Recommendations

All substitute parts listed maintain full electrical and mechanical compatibility with the V68ZT05. The primary selection criterion is product status: V68ZT05P, V68ZT05PX2855, V68ZS05P, V68ZS05PX2855, V68ZU05P, and V68ZU05PX2855 are all active products, whereas the original V68ZT05 is obsolete. For new designs and ongoing procurement, active-status parts are preferred to ensure long-term supply availability and manufacturer support.

Packaging configuration differs between bulk and tape & reel formats. Bulk packaging (original V68ZT05) is suitable for manual assembly and low-volume applications. Tape & reel packaging (all substitute parts) is required for automated pick-and-place assembly and high-volume production. All parts maintain ROHS3 compliance and identical electrical specifications across the varistor voltage range (61.2 V to 74.8 V), surge current (100 A), and thermal operating range (-55°C to 85°C).

Frequently Asked Questions (FAQ)

Q: Can V68ZT05P be used as a direct replacement for V68ZT05?

A: Yes. V68ZT05P is electrically and mechanically identical to V68ZT05, differing only in packaging format (tape & reel versus bulk) and product status (active versus obsolete). The component maintains the same varistor voltage (68 V typical), surge current (100 A), and physical form factor (disc 5mm through-hole).

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

A: Series designations (ZT, ZS, ZU) represent different product lines within Littelfuse's varistor portfolio. All three series maintain identical electrical parameters for the 68 V, 100 A configuration, including varistor voltage range (61.2 V to 74.8 V), surge current, energy rating, and operating temperature. Series differences do not affect substitution compatibility.

Q: Are X2855 suffix variants equivalent to non-suffixed parts?

A: Yes. The X2855 suffix indicates a specific packaging or manufacturing variant but does not alter electrical performance. V68ZT05PX2855 and V68ZT05P are electrically equivalent, as are V68ZS05PX2855 with V68ZS05P, and V68ZU05PX2855 with V68ZU05P.

Q: Why is the original V68ZT05 marked as obsolete?

A: Obsolescence indicates the part is no longer in active production. Active substitute parts (V68ZT05P, V68ZS05P, V68ZU05P, and their X2855 variants) provide equivalent functionality with assured long-term availability and manufacturer support.

Q: Can these parts be used interchangeably in automated assembly?

A: Yes, provided the assembly equipment is configured for tape & reel packaging. All active substitute parts are supplied in tape & reel format, which is standard for automated pick-and-place systems. The bulk-packaged V68ZT05 requires manual handling and is not suitable for automated assembly.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts listed, including the original V68ZT05 and all substitute variants, maintain ROHS3 compliance and are unaffected by REACH regulations.

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