Littelfuse V56ZT3 56V 500A Varistor Equivalent & Substitute Parts

Part Overview

The Littelfuse V56ZT3 is a 56 V, 500 A transient voltage suppressor varistor in a through-hole disc 10mm package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The V56ZT3 operates across a temperature range of -55°C to 85°C and provides transient voltage suppression with 5.5 J energy rating. Active equivalent models from Littelfuse maintain identical electrical and mechanical specifications while offering current product availability.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	56 V
Varistor Voltage Range	50.4 V (Min) to 61.6 V (Max)
Current - Surge	500 A
Energy Rating	5.5 J
Maximum AC Volts	35 V
Maximum DC Volts	45 V
Operating Temperature Range	-55°C to 85°C
Capacitance @ 1 MHz	2150 pF
Number of Circuits	1
Mounting Type	Through Hole
Package / Case	Disc 10mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the V56ZT3 is based on strict electrical and mechanical parameter matching. All substitute parts maintain identical specifications across the following critical parameters:

Varistor voltage rating: 56 V (50.4 V to 61.6 V tolerance band)
Surge current capacity: 500 A
Energy dissipation: 5.5 J
Operating temperature range: -55°C to 85°C
Package form factor: Through-hole disc 10mm
Number of circuits: 1
Capacitance: 2150 pF @ 1 MHz
Maximum AC/DC voltage ratings: 35 V AC / 45 V DC

Substitute parts are differentiated by series designation (ZT, ZS, ZU) and packaging configuration (bulk or tape & reel). All listed substitutes are manufactured by Littelfuse Inc. and maintain ROHS3 compliance and MSL 1 rating.

Parameter Comparison

Part Number	Series	Packaging	Product Status	Varistor Voltage (Typ)	Surge Current	Energy	Operating Temp	Package Type	Inventory (Pcs)
V56ZT3	ZT	Bulk	Obsolete	56 V	500 A	5.5 J	-55°C to 85°C	Disc 10mm	1078
V56ZT3P	ZT	Tape & Reel (TR)	Active	56 V	500 A	5.5 J	-55°C to 85°C	Disc 10mm	889
V56ZT3PX2855	ZT	Tape & Reel (TR)	Active	56 V	500 A	5.5 J	-55°C to 85°C	Disc 10mm	931
V56ZS3P	ZS	Tape & Reel (TR)	Active	56 V	500 A	5.5 J	-55°C to 85°C	Disc 10mm	947
V56ZS3PX2855	ZS	Tape & Reel (TR)	Active	56 V	500 A	5.5 J	-55°C to 85°C	Disc 10mm	900
V56ZU3P	ZU	Tape & Reel (TR)	Active	56 V	500 A	5.5 J	-55°C to 85°C	Disc 10mm	823
V56ZU3PX2855	ZU	Tape & Reel (TR)	Active	56 V	500 A	5.5 J	-55°C to 85°C	Disc 10mm	670

Engineering Selection Recommendations

All substitute parts listed are active products from Littelfuse Inc. with current manufacturing status, ensuring long-term availability and supply chain stability. The V56ZT3 original part is obsolete and should be replaced with an active equivalent for new designs or ongoing production.

For through-hole assembly processes, V56ZT3P, V56ZS3P, and V56ZU3P are available in tape & reel packaging suitable for automated insertion equipment. The X2855 variants (V56ZT3PX2855, V56ZS3PX2855, V56ZU3PX2855) are also tape & reel packaged with identical electrical performance.

All substitute parts maintain ROHS3 compliance and MSL 1 rating, meeting environmental and moisture sensitivity requirements equivalent to the original V56ZT3. Series designation differences (ZT, ZS, ZU) do not affect electrical or mechanical compatibility within the specified parameter tolerance bands.

Frequently Asked Questions (FAQ)

Q: Can V56ZT3P be used as a direct replacement for V56ZT3?

A: Yes. V56ZT3P is the active equivalent of the obsolete V56ZT3. Both maintain identical electrical specifications (56 V varistor voltage, 500 A surge current, 5.5 J energy) and through-hole disc 10mm package form factor. The primary difference is packaging format: V56ZT3 is supplied in bulk, while V56ZT3P is supplied in tape & reel configuration.

Q: What is the difference between V56ZT3P, V56ZS3P, and V56ZU3P?

A: These parts differ only in series designation (ZT, ZS, ZU). All three maintain identical electrical parameters, operating temperature range, and package specifications. Series designation reflects internal design variations within Littelfuse manufacturing but does not affect functional performance or compatibility in circuit applications.

Q: Are the X2855 variants (V56ZT3PX2855, V56ZS3PX2855, V56ZU3PX2855) electrically equivalent?

A: Yes. The X2855 suffix indicates a specific tape & reel packaging configuration. Electrical and mechanical specifications remain identical to the non-X2855 variants. Selection between standard and X2855 variants depends on assembly equipment compatibility and tape specifications.

Q: Is the V56ZT3 suitable for new designs?

A: No. The V56ZT3 is classified as obsolete. For new designs, select from the active equivalents: V56ZT3P, V56ZS3P, V56ZS3PX2855, V56ZT3PX2855, V56ZU3P, or V56ZU3PX2855. All active parts maintain identical performance specifications and offer assured long-term availability.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. All substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original V56ZT3 specifications. REACH status is unaffected for all active equivalents.

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