V56ZS2 Equivalent & Substitute Parts

Part Overview

The V56ZS2 is a 56 V, 250 A Transient Voltage Suppressor (TVS) varistor manufactured by Littelfuse in a through-hole disc 7mm package. This component is classified as obsolete, though functionally equivalent active alternatives are available from the same manufacturer. The V56ZS2 remains in stock (864 pcs), but sourcing active-status equivalents is recommended for new designs and long-term availability assurance.

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
Capacitance @ 1 MHz	1035 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

Substitution eligibility for the V56ZS2 is determined by strict electrical and mechanical parameter matching:

Substitution Criteria:

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

All identified substitutes meet these parameters identically. Differences exist only in product series designation (ZS, ZT, ZU) and packaging format (Cut Tape vs. Tape & Reel).

Parameter Comparison

Part Number	Manufacturer	Series	Packaging	Product Status	Varistor Voltage (Typ)	Current - Surge	Max AC Volts	Max DC Volts	Energy	Capacitance @ 1 MHz	Operating Temp	RoHS Status	Inventory (pcs)
V56ZS2	Littelfuse	ZS	Disc 7mm	Obsolete	56 V	250 A	35 V	45 V	2.3 J	1035 pF	-55°C to 85°C	ROHS3	864
V56ZS2P	Littelfuse Inc.	ZS	Cut Tape (CT)	Active	56 V	250 A	35 V	45 V	2.3 J	1035 pF	-55°C to 85°C	ROHS3	11494
V56ZS2PX2855	Littelfuse Inc.	ZS	Tape & Reel (TR)	Active	56 V	250 A	35 V	45 V	2.3 J	1035 pF	-55°C to 85°C	ROHS3	923
V56ZT2P	Littelfuse Inc.	ZT	Cut Tape (CT)	Active	56 V	250 A	35 V	45 V	2.3 J	1035 pF	-55°C to 85°C	ROHS3	11421
V56ZT2PX2855	Littelfuse Inc.	ZT	Tape & Reel (TR)	Active	56 V	250 A	35 V	45 V	2.3 J	1035 pF	-55°C to 85°C	ROHS3	999
V56ZU2P	Littelfuse Inc.	ZU	Tape & Reel (TR)	Active	56 V	250 A	35 V	45 V	2.3 J	1035 pF	-55°C to 85°C	ROHS3	679
V56ZU2PX2855	Littelfuse Inc.	ZU	Tape & Reel (TR)	Active	56 V	250 A	35 V	45 V	2.3 J	1035 pF	-55°C to 85°C	ROHS3	858

Engineering Selection Recommendations

For Obsolete Part Replacement: The V56ZS2 is obsolete. Direct functional equivalents with active product status are V56ZS2P (Cut Tape) and V56ZS2PX2855 (Tape & Reel), both maintaining identical electrical and mechanical specifications within the same ZS series.

For New Designs: Active alternatives across ZT and ZU series (V56ZT2P, V56ZT2PX2855, V56ZU2P, V56ZU2PX2855) provide equivalent performance with confirmed long-term availability. All substitutes carry ROHS3 compliance and REACH Unaffected status.

Packaging Considerations:

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

Inventory Availability: V56ZS2P and V56ZT2P offer the highest stock levels (11494 and 11421 pcs respectively), ensuring supply continuity for production requirements.

Frequently Asked Questions (FAQ)

Q: Can I use V56ZT2P or V56ZU2P as a direct replacement for V56ZS2? A: Yes. All substitute parts maintain identical electrical parameters (56 V varistor voltage, 250 A surge current, 2.3 J energy) and mechanical specifications (through-hole, disc 7mm package). Series designation (ZS, ZT, ZU) does not affect functional compatibility.

Q: What is the difference between Cut Tape and Tape & Reel packaging? A: Cut Tape (CT) is supplied in individual strips suitable for manual handling and lower-volume assembly. Tape & Reel (TR) is wound on reels for automated assembly equipment. Electrical and mechanical performance is identical; selection depends on assembly process requirements.

Q: Are all substitutes RoHS compliant? A: Yes. All listed substitutes are ROHS3 compliant and REACH Unaffected, meeting current environmental and regulatory requirements.

Q: Why is V56ZS2 marked as obsolete? A: Littelfuse has transitioned the ZS series to active status through packaging variants (V56ZS2P, V56ZS2PX2855). The original V56ZS2 designation is no longer actively produced, though functional equivalents remain available.

Q: Can I mix packaging formats in the same assembly? A: Yes. Cut Tape and Tape & Reel formats contain identical components; mixing is permissible from an electrical and mechanical standpoint. Assembly process compatibility should be verified with your manufacturing equipment specifications.

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