V27ZT2 Equivalent & Substitute Parts Reference

Part Overview

The V27ZT2 is a 27 V 500 A disc varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole applications. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The V27ZT2 maintains full electrical and mechanical compatibility with active alternatives across multiple series designations within the Littelfuse ZT, ZS, and ZU product lines.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	27 V
Current - Surge	500 A
Maximum AC Volts	17 V
Maximum DC Volts	22 V
Energy	2.5 J
Capacitance @ 1 MHz	3850 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

Substitution eligibility for the V27ZT2 is determined by strict equivalence across the following electrical and mechanical parameters:

Varistor voltage range: 24.3 V (minimum) to 29.7 V (maximum)
Surge current rating: 500 A
Maximum AC and DC voltage ratings: 17 V AC / 22 V DC
Energy dissipation: 2.5 J
Capacitance: 3850 pF @ 1 MHz
Operating temperature: -55°C to 85°C
Physical form factor: Disc 10mm through-hole package
Single circuit configuration

All substitute parts listed maintain identical electrical performance and physical dimensions. Differences exist only in series designation (ZT, ZS, ZU), packaging format (bulk versus tape & reel), and product status (active versus obsolete).

Parameter Comparison

Part Number	Manufacturer	Series	Varistor Voltage (Typ)	Surge Current	Max AC / DC Volts	Energy	Capacitance @ 1 MHz	Operating Temp	Package	Packaging Format	Product Status	Inventory
V27ZT2	Littelfuse Inc.	ZT	27 V	500 A	17 V / 22 V	2.5 J	3850 pF	-55°C ~ 85°C	Disc 10mm	Bulk	Obsolete	1153 Pcs
V27ZT2P	Littelfuse Inc.	ZT	27 V	500 A	17 V / 22 V	2.5 J	3850 pF	-55°C ~ 85°C	Disc 10mm	Tape & Reel	Active	1061 Pcs
V27ZS2P	Littelfuse Inc.	ZS	27 V	500 A	17 V / 22 V	2.5 J	3850 pF	-55°C ~ 85°C	Disc 10mm	Tape & Reel	Active	1020 Pcs
V27ZS2PX2855	Littelfuse Inc.	ZS	27 V	500 A	17 V / 22 V	2.5 J	3850 pF	-55°C ~ 85°C	Disc 10mm	Tape & Reel	Active	1009 Pcs
V27ZT2PX2855	Littelfuse Inc.	ZT	27 V	500 A	17 V / 22 V	2.5 J	3850 pF	-55°C ~ 85°C	Disc 10mm	Tape & Reel	Active	672 Pcs
V27ZU2P	Littelfuse Inc.	ZU	27 V	500 A	17 V / 22 V	2.5 J	3850 pF	-55°C ~ 85°C	Disc 10mm	Tape & Reel	Active	764 Pcs
V27ZU2PX2855	Littelfuse Inc.	ZU	27 V	500 A	17 V / 22 V	2.5 J	3850 pF	-55°C ~ 85°C	Disc 10mm	Tape & Reel	Active	893 Pcs

Engineering Selection Recommendations

All substitute parts are manufactured by Littelfuse Inc. and carry ROHS3 compliance with MSL rating of 1 (Unlimited). All substitute parts maintain active product status, ensuring long-term availability and supply chain continuity.

For applications requiring immediate component availability, V27ZT2P, V27ZS2P, and V27ZU2P offer the highest inventory levels in tape & reel packaging. The X2855 variants (V27ZT2PX2855, V27ZS2PX2855, V27ZU2PX2855) provide equivalent electrical and mechanical performance with comparable stock levels.

Series designation (ZT, ZS, ZU) does not affect electrical performance or physical compatibility. Selection between series variants should be based on procurement availability and internal design documentation requirements.

Frequently Asked Questions (FAQ)

Q: Can V27ZT2P be used as a direct replacement for V27ZT2?

A: Yes. V27ZT2P is electrically and mechanically identical to V27ZT2. The primary difference is packaging format: V27ZT2P is supplied in tape & reel format while V27ZT2 is bulk packaged. Both maintain identical electrical specifications and through-hole disc 10mm form factor.

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

A: Series designation does not affect electrical performance or physical dimensions. All three series (ZT, ZS, ZU) deliver identical varistor voltage, surge current, energy dissipation, and capacitance specifications. Series differences reflect internal manufacturing or design evolution but do not impact circuit performance or compatibility.

Q: Are the X2855 variants functionally equivalent to non-X2855 parts?

A: Yes. The X2855 suffix indicates a manufacturing or packaging variant but does not alter electrical specifications or physical form factor. V27ZT2PX2855, V27ZS2PX2855, and V27ZU2PX2855 are fully equivalent to V27ZT2P, V27ZS2P, and V27ZU2P respectively.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts are ROHS3 compliant with MSL rating 1 (Unlimited moisture sensitivity level). All parts carry REACH Unaffected status and EAR99 export classification.

Q: Can bulk and tape & reel packaged parts be used interchangeably in circuit design?

A: Yes. Packaging format affects procurement and assembly processes but does not alter electrical performance or physical component dimensions. Bulk and tape & reel variants are electrically and mechanically interchangeable.

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