Littelfuse V56ZT05 Equivalent & Substitute Parts

Part Overview

The Littelfuse V56ZT05 is a 56 V, 100 A disc varistor designed for transient voltage suppression in through-hole applications. This component operates across a temperature range of -55°C to 85°C and is rated for 0.5 J energy dissipation with a nominal varistor voltage of 56 V. The V56ZT05 carries an obsolete product status, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	56 V
Current - Surge	100 A
Maximum AC Volts	35 V
Maximum DC Volts	45 V
Energy	0.5 J
Capacitance @ 1 MHz	500 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 5mm
Number of Circuits	1

Substitute Part Grouping Explanation

Substitution for the V56ZT05 is determined by electrical and mechanical parameter equivalence. All substitute parts maintain identical electrical specifications: 56 V nominal varistor voltage, 100 A surge current rating, 0.5 J energy dissipation, 500 pF capacitance at 1 MHz, and -55°C to 85°C operating temperature range. All parts feature the same through-hole disc 5mm package configuration and single-circuit design.

Substitutes are grouped into two categories:

Direct Manufacturer Equivalent (Same Series): V56ZT05P maintains the ZT series designation and differs only in packaging format (Tape & Reel) and product status (Active vs. Obsolete).

Parametric Equivalents (Alternative Series): V56ZS05P, V56ZS05PX2855, V56ZU05P, and V56ZU05PX2855 represent alternative Littelfuse series (ZS and ZU) that meet identical electrical and mechanical specifications. These parts are functionally interchangeable based on the provided parameters.

Parameter Comparison

Part Number	Series	Varistor Voltage (V)	Surge Current (A)	Max AC (V)	Max DC (V)	Energy (J)	Capacitance @ 1 MHz (pF)	Operating Temp (°C)	Package	Product Status
V56ZT05	ZT	56	100	35	45	0.5	500	-55 to 85	Disc 5mm	Obsolete
V56ZT05P	ZT	56	100	35	45	0.5	500	-55 to 85	Disc 5mm	Active
V56ZS05P	ZS	56	100	35	45	0.5	500	-55 to 85	Disc 5mm	Active
V56ZS05PX2855	ZS	56	100	35	45	0.5	500	-55 to 85	Disc 5mm	Active
V56ZT05PX2855	ZT	56	100	35	45	0.5	500	-55 to 85	Disc 5mm	Active
V56ZU05P	ZU	56	100	35	45	0.5	500	-55 to 85	Disc 5mm	Active
V56ZU05PX2855	ZU	56	100	35	45	0.5	500	-55 to 85	Disc 5mm	Active

Engineering Selection Recommendations

All substitute parts are ROHS3 compliant and carry Moisture Sensitivity Level 1 (Unlimited), matching the original V56ZT05 specifications. Substitute selection should prioritize active product status for long-term supply chain stability.

V56ZT05P is the primary recommendation as the direct manufacturer equivalent within the same ZT series, offering identical electrical and mechanical performance with active product status and Tape & Reel packaging.

V56ZS05P, V56ZS05PX2855, V56ZU05P, and V56ZU05PX2855 are valid parametric equivalents suitable for applications where series designation is not a design constraint. All maintain full electrical and thermal compatibility with the original part.

Parts designated with the "PX2855" suffix indicate specific packaging or tape configuration variants and are functionally equivalent to their non-suffixed counterparts.

Frequently Asked Questions (FAQ)

Q: Can I substitute V56ZT05 with parts from different series (ZS or ZU)?

A: Yes. All substitute parts maintain identical electrical specifications (56 V varistor voltage, 100 A surge current, 0.5 J energy) and mechanical configuration (through-hole disc 5mm package). Series designation does not affect functional compatibility based on the provided parameters.

Q: What is the difference between V56ZT05P and V56ZT05PX2855?

A: Both parts are in the ZT series with identical electrical and mechanical specifications. The PX2855 designation indicates a packaging or tape configuration variant. Both are active products suitable for direct substitution.

Q: Why is the original V56ZT05 marked as obsolete?

A: The V56ZT05 carries obsolete status, but multiple active equivalents are available from Littelfuse. V56ZT05P provides the most direct replacement within the same series.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the original part's compliance profile.

Q: Does packaging format affect electrical performance?

A: No. Packaging differences (bulk vs. Tape & Reel) do not affect electrical or thermal performance. Selection should be based on procurement and assembly process requirements.

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