Littelfuse V12ZT2 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The Littelfuse V12ZT2 is a 12.5 V varistor rated for 250 A surge current in a through-hole disc 10mm package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The V12ZT2 series provides transient voltage suppression across a single circuit with energy absorption capability of 1.2 J and operates across the temperature range of -55°C to 85°C.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	12.5 V
Current - Surge	250 A
Maximum AC Volts	6 V
Maximum DC Volts	8 V
Energy	1.2 J
Capacitance @ 1 MHz	6100 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 10mm
Number of Circuits	1

Substitute Part Grouping Explanation

Substitute parts for the V12ZT2 are qualified based on identical electrical and mechanical parameters. All substitute candidates maintain the following critical specifications:

Varistor voltage range (9 V minimum to 16 V maximum with 12.5 V typical), 250 A surge current rating, 1.2 J energy absorption, 6100 pF capacitance at 1 MHz, -55°C to 85°C operating temperature, through-hole mounting, and disc 10mm package configuration.

Substitutes are differentiated by series designation (ZT, ZS, ZU) and packaging format (bulk versus tape & reel). The V12ZT2P represents a direct packaging variant of the original part. The V12ZS2P, V12ZS2PX2855, V12ZT2PX2855, V12ZU2P, and V12ZU2PX2855 are parametric equivalents across different series lines, all manufactured by Littelfuse with active product status and ROHS3 compliance.

Parameter Comparison

Part Number	Series	Packaging	Product Status	Varistor Voltage (Typ)	Surge Current	Energy	Operating Temp	Inventory (Pcs)
V12ZT2	ZT	Bulk	Obsolete	12.5 V	250 A	1.2 J	-55°C to 85°C	863
V12ZT2P	ZT	Tape & Reel	Active	12.5 V	250 A	1.2 J	-55°C to 85°C	899
V12ZS2P	ZS	Tape & Reel	Active	12.5 V	250 A	1.2 J	-55°C to 85°C	1069
V12ZS2PX2855	ZS	Tape & Reel	Active	12.5 V	250 A	1.2 J	-55°C to 85°C	982
V12ZT2PX2855	ZT	Tape & Reel	Active	12.5 V	250 A	1.2 J	-55°C to 85°C	958
V12ZU2P	ZU	Tape & Reel	Active	12.5 V	250 A	1.2 J	-55°C to 85°C	924
V12ZU2PX2855	ZU	Tape & Reel	Active	12.5 V	250 A	1.2 J	-55°C to 85°C	802

Engineering Selection Recommendations

All substitute parts listed maintain identical electrical performance specifications and mechanical form factors. The primary selection criterion is product status: the original V12ZT2 is obsolete, while all substitute options carry active product status from Littelfuse.

For new designs and ongoing production, V12ZT2P is the direct successor, maintaining the ZT series designation with tape & reel packaging. The parametric equivalents V12ZS2P, V12ZS2PX2855, V12ZU2P, and V12ZU2PX2855 provide alternative series options with identical electrical characteristics and active availability.

All substitute parts are ROHS3 compliant and carry REACH unaffected status. Packaging format selection depends on assembly requirements: tape & reel packaging suits automated pick-and-place operations, while bulk packaging accommodates manual assembly workflows.

Frequently Asked Questions (FAQ)

Q: Can V12ZT2P directly replace V12ZT2 in existing designs?

A: Yes. V12ZT2P maintains identical electrical parameters (12.5 V typical varistor voltage, 250 A surge current, 1.2 J energy) and mechanical configuration (through-hole disc 10mm). The difference is packaging format: V12ZT2 is bulk, V12ZT2P is tape & reel.

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

A: All three series (ZT, ZS, ZU) are Littelfuse varistor lines with identical electrical specifications for this voltage and current rating. Series designation reflects internal manufacturing or design lineage. Electrical performance and physical dimensions are equivalent.

Q: Are the X2855 variants functionally equivalent?

A: Yes. The X2855 suffix indicates a specific packaging or manufacturing variant. V12ZS2PX2855, V12ZT2PX2855, and V12ZU2PX2855 maintain all electrical and mechanical parameters identical to their non-X2855 counterparts.

Q: Which substitute should be selected for automated assembly?

A: All substitute parts listed are available in tape & reel packaging (V12ZT2P, V12ZS2P, V12ZS2PX2855, V12ZT2PX2855, V12ZU2P, V12ZU2PX2855), suitable for automated pick-and-place equipment.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All substitute parts carry ROHS3 compliance and REACH unaffected status, meeting environmental and regulatory requirements for electronics manufacturing.

Q: What inventory considerations apply to substitute selection?

A: Current inventory levels vary across substitute options. V12ZS2P maintains the highest inventory (1069 pcs), while V12ZU2PX2855 has the lowest (802 pcs). Selection should account for production volume requirements and supply chain lead times.

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