Littelfuse V27ZT4 Equivalent & Substitute Parts

Part Overview

The Littelfuse V27ZT4 is a 27 V, 1 kA 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 5 J energy dissipation. The V27ZT4 carries an obsolete product status, making equivalent substitute parts necessary for ongoing design support and procurement continuity. Active alternatives from Littelfuse maintain identical electrical and mechanical specifications while offering current manufacturing availability.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	27 V
Current - Surge	1 kA
Maximum AC Volts	17 V
Maximum DC Volts	22 V
Energy Rating	5 J
Capacitance @ 1 MHz	11480 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 14mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the V27ZT4 is determined by strict equivalence across all electrical and mechanical parameters. The following criteria define valid substitutes:

Varistor voltage range: 24.3 V (Min) to 29.7 V (Max), with 27 V typical
Surge current capacity: 1 kA
Energy dissipation: 5 J
Capacitance: 11480 pF @ 1 MHz
Operating temperature: -55°C to 85°C
Package: Disc 14mm through-hole configuration
Compliance: ROHS3 Compliant, MSL 1

All substitute parts listed maintain these exact specifications. Differences exist only in series designation (ZT, ZS, ZU) and packaging format (bulk versus tape & reel). Series variations represent internal manufacturing process differences that do not affect electrical performance or mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Series	Status	Packaging	Varistor Voltage (Typ)	Surge Current	Energy	Operating Temp	Inventory
V27ZT4	Littelfuse	ZT	Obsolete	Bulk	27 V	1 kA	5 J	-55°C to 85°C	1103 Pcs
V27ZT4P	Littelfuse Inc.	ZT	Active	Tape & Reel	27 V	1 kA	5 J	-55°C to 85°C	1050 Pcs
V27ZS4P	Littelfuse Inc.	ZS	Active	Tape & Reel	27 V	1 kA	5 J	-55°C to 85°C	1002 Pcs
V27ZS4PX2855	Littelfuse	ZS	Active	Tape & Reel	27 V	1 kA	5 J	-55°C to 85°C	727 Pcs
V27ZT4PX2855	Littelfuse Inc.	ZT	Active	Tape & Reel	27 V	1 kA	5 J	-55°C to 85°C	800 Pcs
V27ZU4P	Littelfuse Inc.	ZU	Active	Tape & Reel	27 V	1 kA	5 J	-55°C to 85°C	751 Pcs
V27ZU4PX2855	Littelfuse Inc.	ZU	Active	Tape & Reel	27 V	1 kA	5 J	-55°C to 85°C	1042 Pcs

Engineering Selection Recommendations

All listed substitute parts are active products with current manufacturing status and full ROHS3 compliance. The V27ZT4P represents the direct successor, maintaining identical ZT series designation while transitioning to tape & reel packaging for automated assembly environments. The V27ZS4P and V27ZU4P variants offer equivalent electrical performance through alternative series implementations, suitable for applications where series flexibility exists.

For through-hole manual assembly or rework applications, bulk packaging may be preferred. For high-volume production with automated pick-and-place equipment, tape & reel formats (V27ZT4P, V27ZS4P, V27ZS4PX2855, V27ZT4PX2855, V27ZU4P, V27ZU4PX2855) provide operational efficiency. All parts maintain identical electrical characteristics, mechanical dimensions, and environmental ratings.

Frequently Asked Questions (FAQ)

Q: Can V27ZT4 be directly replaced with V27ZT4P? A: Yes. V27ZT4P is the direct active equivalent with identical electrical specifications and mechanical form factor. The primary difference is packaging format: V27ZT4 is supplied in bulk, while V27ZT4P uses tape & reel configuration.

Q: What is the difference between ZT, ZS, and ZU series designations? A: Series designations represent internal manufacturing process variations within Littelfuse varistor product lines. All three series (ZT, ZS, ZU) deliver identical electrical performance and mechanical compatibility for this 27 V, 1 kA specification.

Q: Are the X2855 suffix variants electrically equivalent? A: Yes. The X2855 suffix indicates a specific manufacturing date code or internal tracking designation. Electrical and mechanical specifications remain unchanged. These parts are fully interchangeable with non-suffixed equivalents.

Q: Can these varistors be used in automated assembly? A: Tape & reel packaged variants (V27ZT4P, V27ZS4P, V27ZS4PX2855, V27ZT4PX2855, V27ZU4P, V27ZU4PX2855) are designed for automated pick-and-place equipment. The original V27ZT4 bulk packaging is suitable for manual assembly or rework operations.

Q: Are all substitutes ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original V27ZT4 specifications.

Q: What is the maximum voltage these varistors can suppress? A: The varistor voltage range is 24.3 V minimum to 29.7 V maximum, with 27 V typical. Maximum AC rating is 17 V and maximum DC rating is 22 V for continuous operation.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message