Littelfuse V12ZS2 Varistor: Equivalent & Substitute Parts

Part Overview

The Littelfuse V12ZS2 is a 12.5 V, 250 A transient voltage suppressor varistor in a through-hole disc 10mm package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The V12ZS2 series provides transient voltage suppression across a single circuit with 1.2 J energy rating and operates across the temperature range of -55°C to 85°C. Direct substitutes and parametric equivalents from the active ZS, ZT, and ZU series maintain identical electrical and mechanical specifications while offering improved product availability.

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
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the V12ZS2 are qualified based on strict electrical and mechanical parameter matching. All substitute parts maintain identical specifications across the following critical parameters:

Varistor voltage range: 9 V (minimum) to 16 V (maximum), with 12.5 V typical
Surge current capacity: 250 A
Maximum AC and DC voltage ratings: 6 V AC / 8 V DC
Energy dissipation: 1.2 J
Capacitance: 6100 pF @ 1 MHz
Operating temperature: -55°C to 85°C
Mounting configuration: Through hole
Package form factor: Disc 10mm
Circuit count: 1

Substitutes are categorized into two groups: direct manufacturer part number equivalents (packaging variation) and parametric equivalents (series variation). All substitute parts are manufactured by Littelfuse Inc. and maintain ROHS3 compliance.

Parameter Comparison

Part Number	Series	Product Status	Packaging	Varistor Voltage (Typ)	Surge Current	Max AC / DC Volts	Energy	Capacitance @ 1 MHz	Operating Temp	RoHS Status	Inventory
V12ZS2	ZS	Obsolete	Bulk	12.5 V	250 A	6 V / 8 V	1.2 J	6100 pF	-55°C to 85°C	ROHS3	687 Pcs
V12ZS2P	ZS	Active	Tape & Reel	12.5 V	250 A	6 V / 8 V	1.2 J	6100 pF	-55°C to 85°C	ROHS3	1069 Pcs
V12ZS2PX2855	ZS	Active	Tape & Reel	12.5 V	250 A	6 V / 8 V	1.2 J	6100 pF	-55°C to 85°C	ROHS3	982 Pcs
V12ZT2P	ZT	Active	Tape & Reel	12.5 V	250 A	6 V / 8 V	1.2 J	6100 pF	-55°C to 85°C	ROHS3	899 Pcs
V12ZT2PX2855	ZT	Active	Tape & Reel	12.5 V	250 A	6 V / 8 V	1.2 J	6100 pF	-55°C to 85°C	ROHS3	958 Pcs
V12ZU2P	ZU	Active	Tape & Reel	12.5 V	250 A	6 V / 8 V	1.2 J	6100 pF	-55°C to 85°C	ROHS3	924 Pcs
V12ZU2PX2855	ZU	Active	Tape & Reel	12.5 V	250 A	6 V / 8 V	1.2 J	6100 pF	-55°C to 85°C	ROHS3	802 Pcs

Engineering Selection Recommendations

All substitute parts listed maintain active product status with Littelfuse Inc., ensuring long-term availability and manufacturing support. The primary distinction between substitutes is packaging configuration: V12ZS2P, V12ZS2PX2855, V12ZT2P, V12ZT2PX2855, V12ZU2P, and V12ZU2PX2855 are supplied in Tape & Reel format, suitable for automated assembly processes, whereas the original V12ZS2 was supplied in bulk packaging.

All substitute parts carry ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements. Series variations (ZS, ZT, ZU) represent different manufacturing generations within the Littelfuse varistor product line, with all variants maintaining identical electrical performance specifications.

For applications requiring bulk packaging, V12ZS2P remains the closest direct equivalent. For automated manufacturing environments, any of the Tape & Reel variants (V12ZS2PX2855, V12ZT2P, V12ZT2PX2855, V12ZU2P, V12ZU2PX2855) provide equivalent electrical performance with improved procurement flexibility.

Frequently Asked Questions (FAQ)

Q: Can V12ZS2 be directly replaced with V12ZS2P? A: Yes. V12ZS2P is a direct manufacturer equivalent with identical electrical and mechanical specifications. The only difference is packaging format: V12ZS2P is supplied in Tape & Reel configuration instead of bulk. Both are manufactured by Littelfuse Inc. and maintain the same 12.5 V varistor voltage, 250 A surge current, and 1.2 J energy rating.

Q: What is the difference between ZS, ZT, and ZU series variants? A: ZS, ZT, and ZU represent different manufacturing series within the Littelfuse varistor product line. All variants listed maintain identical electrical parameters: 12.5 V typical varistor voltage, 250 A surge current, 6 V AC / 8 V DC maximum ratings, 1.2 J energy, and 6100 pF capacitance. Series designation reflects manufacturing generation, not functional difference.

Q: Are the X2855 variants functionally equivalent? A: Yes. Parts designated with "X2855" suffix (V12ZS2PX2855, V12ZT2PX2855, V12ZU2PX2855) maintain identical electrical specifications to their non-suffixed counterparts. The X2855 designation indicates a specific manufacturing or traceability code but does not affect electrical performance or compatibility.

Q: Which substitute should be selected for new designs? A: For new designs, any active product variant (V12ZS2P, V12ZS2PX2855, V12ZT2P, V12ZT2PX2855, V12ZU2P, V12ZU2PX2855) is suitable. Selection should be based on packaging requirements: Tape & Reel variants are preferred for automated assembly, while bulk packaging may be selected for manual assembly or low-volume applications.

Q: Are all substitutes ROHS3 compliant? A: Yes. All substitute parts listed carry ROHS3 compliance certification and REACH unaffected status, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

Q: Can substitutes be used interchangeably in existing applications? A: Yes. All substitute parts maintain identical electrical and mechanical specifications, including varistor voltage range (9 V to 16 V), surge current capacity (250 A), voltage ratings (6 V AC / 8 V DC), energy dissipation (1.2 J), operating temperature range (-55°C to 85°C), and through-hole disc 10mm package form factor. Direct substitution is supported without circuit modification.

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