Littelfuse V56ZT2 Equivalent & Substitute Parts

Part Overview

The Littelfuse V56ZT2 is a 56 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. Active alternatives within the Littelfuse ZT, ZS, and ZU series maintain identical electrical and mechanical specifications, ensuring direct functional compatibility in circuit protection applications.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	56 V
Current - Surge	250 A
Maximum AC Volts	35 V
Maximum DC Volts	45 V
Energy	2.3 J
Mounting Type	Through Hole
Package / Case	Disc 7mm
Operating Temperature	-55°C ~ 85°C
Capacitance @ 1 MHz	1035 pF
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the V56ZT2 is based on strict electrical and mechanical parameter matching. All substitute parts maintain identical specifications across the following critical parameters:

Varistor voltage range: 50.4 V (Min) to 61.6 V (Max), with 56 V typical
Surge current capacity: 250 A
Maximum AC and DC voltage ratings: 35 V AC / 45 V DC
Energy dissipation: 2.3 J
Mounting configuration: Through hole, disc 7mm package
Operating temperature range: -55°C to 85°C
Capacitance: 1035 pF @ 1 MHz
Compliance: ROHS3 Compliant, MSL 1 (Unlimited)

Substitute parts are grouped by series designation (ZT, ZS, ZU) and packaging format (Cut Tape or Tape & Reel). All listed substitutes are active products with current manufacturing status.

Parameter Comparison

Part Number	Manufacturer	Series	Packaging	Status	Varistor Voltage (Typ)	Surge Current	Max AC / DC Volts	Energy	Inventory (Pcs)
V56ZT2	Littelfuse	ZT	Disc 7mm	Obsolete	56 V	250 A	35 V / 45 V	2.3 J	1111
V56ZT2P	Littelfuse Inc.	ZT	Cut Tape (CT)	Active	56 V	250 A	35 V / 45 V	2.3 J	11421
V56ZT2PX2855	Littelfuse Inc.	ZT	Tape & Reel (TR)	Active	56 V	250 A	35 V / 45 V	2.3 J	999
V56ZS2P	Littelfuse Inc.	ZS	Cut Tape (CT)	Active	56 V	250 A	35 V / 45 V	2.3 J	11494
V56ZS2PX2855	Littelfuse Inc.	ZS	Tape & Reel (TR)	Active	56 V	250 A	35 V / 45 V	2.3 J	923
V56ZU2P	Littelfuse Inc.	ZU	Tape & Reel (TR)	Active	56 V	250 A	35 V / 45 V	2.3 J	679
V56ZU2PX2855	Littelfuse Inc.	ZU	Tape & Reel (TR)	Active	56 V	250 A	35 V / 45 V	2.3 J	858

Engineering Selection Recommendations

All listed substitute parts are manufactured by Littelfuse Inc. and maintain active product status, ensuring long-term availability and supply chain continuity. Each substitute meets ROHS3 compliance and carries MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental and regulatory requirements of the obsolete V56ZT2.

Selection between substitute parts should be based on packaging requirements:

Cut Tape (CT) packaging: V56ZT2P or V56ZS2P for manual assembly or lower-volume applications
Tape & Reel (TR) packaging: V56ZT2PX2855, V56ZS2PX2855, V56ZU2P, or V56ZU2PX2855 for automated pick-and-place assembly

Series designation (ZT, ZS, ZU) does not affect electrical performance; all series variants are parametrically equivalent for the 56 V, 250 A specification.

Frequently Asked Questions (FAQ)

Q: Can V56ZT2 be directly replaced with V56ZT2P?

A: Yes. V56ZT2P is the active equivalent of the obsolete V56ZT2, maintaining identical electrical specifications. The primary difference is packaging format: V56ZT2P is supplied in Cut Tape, while the original V56ZT2 was supplied in bulk disc format.

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

A: For the 56 V, 250 A specification, ZT, ZS, and ZU series are parametrically equivalent. All maintain identical varistor voltage, surge current, energy dissipation, and operating temperature ranges. Series designation reflects internal manufacturing or design generation but does not affect circuit performance.

Q: Are Tape & Reel (TR) parts compatible with through-hole assembly?

A: Yes. Tape & Reel packaging is a supply format for automated assembly equipment. The physical component remains a through-hole disc 7mm varistor, compatible with standard PCB through-hole mounting.

Q: Does packaging format affect electrical performance?

A: No. Cut Tape and Tape & Reel packaging formats are supply and handling methods only. The electrical and mechanical specifications of the varistor remain identical regardless of packaging.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant certification, matching the compliance status of the original V56ZT2.

Q: Which substitute has the highest current inventory?

A: V56ZT2P (Cut Tape) has the highest inventory at 11,421 pieces, followed by V56ZS2P (Cut Tape) at 11,494 pieces.

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