Littelfuse V120ZU6 Equivalent & Substitute Parts

Part Overview

The Littelfuse V120ZU6 is a 120 V, 4.5 kA disc varistor designed for transient voltage suppression in through-hole applications. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. Equivalent and parametrically compatible alternatives from the Littelfuse ZU, ZS, and ZT series maintain identical electrical performance and mechanical form factors while offering active product status and improved availability.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	120 V
Current - Surge	4.5 kA
Maximum AC Volts	75 V
Maximum DC Volts	102 V
Energy	22 J
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 14mm
Number of Circuits	1
Capacitance @ 1 MHz	2450 pF

Substitute Part Grouping Explanation

Substitution of the V120ZU6 is based on strict electrical and mechanical parameter matching. All substitute parts maintain identical specifications across the following critical parameters: varistor voltage range (108 V minimum to 132 V maximum), surge current rating (4.5 kA), energy absorption (22 J), operating temperature range (-55°C to 85°C), and physical form factor (disc 14mm through-hole package). Substitutes differ only in series designation (ZU, ZS, ZT) and packaging configuration (bulk versus tape & reel). All substitute parts are active products with ROHS3 compliance and REACH unaffected status, ensuring regulatory compliance and supply chain continuity.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Packaging	Varistor Voltage (Typ)	Current - Surge	Energy	Operating Temp	Package / Case	RoHS Status	Inventory
V120ZU6	Littelfuse Inc.	ZU	Obsolete	Bulk	120 V	4.5 kA	22 J	-55°C ~ 85°C	Disc 14mm	ROHS3	916 Pcs
V120ZU6P	Littelfuse	ZU	Active	Tape & Reel	120 V	4.5 kA	22 J	-55°C ~ 85°C	Disc 14mm	ROHS3	905 Pcs
V120ZS6P	Littelfuse Inc.	ZS	Active	Tape & Reel	120 V	4.5 kA	22 J	-55°C ~ 85°C	Disc 14mm	ROHS3	1127 Pcs
V120ZS6PX2855	Littelfuse Inc.	ZS	Active	Tape & Reel	120 V	4.5 kA	22 J	-55°C ~ 85°C	Disc 14mm	ROHS3	1193 Pcs
V120ZT6P	Littelfuse Inc.	ZT	Active	Tape & Reel	120 V	4.5 kA	22 J	-55°C ~ 85°C	Disc 14mm	ROHS3	1153 Pcs
V120ZT6PX2855	Littelfuse	ZT	Active	Tape & Reel	120 V	4.5 kA	22 J	-55°C ~ 85°C	Disc 14mm	ROHS3	1081 Pcs
V120ZU6PX2855	Littelfuse	ZU	Active	Tape & Reel	120 V	4.5 kA	22 J	-55°C ~ 85°C	Disc 14mm	ROHS3	815 Pcs

Engineering Selection Recommendations

All listed substitute parts are direct electrical and mechanical equivalents to the V120ZU6. Selection among substitutes should prioritize active product status and supply availability. The V120ZU6P represents the closest direct substitute, maintaining the same ZU series designation while transitioning from bulk to tape & reel packaging. The ZS and ZT series alternatives (V120ZS6P, V120ZS6PX2855, V120ZT6P, V120ZT6PX2855) provide parametric equivalence with higher inventory levels and confirmed active production status. All substitute parts carry ROHS3 compliance and REACH unaffected certification, meeting current regulatory requirements. Tape & reel packaging variants (identified by "P" and "X2855" suffixes) are suitable for automated assembly processes, while bulk packaging may require manual handling.

Frequently Asked Questions (FAQ)

Q: Can V120ZU6P directly replace V120ZU6 in existing designs? A: Yes. V120ZU6P is electrically and mechanically identical to V120ZU6, differing only in packaging format (tape & reel versus bulk). Through-hole mounting and all electrical parameters remain unchanged.

Q: What is the difference between ZU, ZS, and ZT series variants? A: Series designation indicates internal design generation within the Littelfuse varistor product line. All three series maintain identical electrical specifications for the 120 V, 4.5 kA rating, including varistor voltage range, surge current, energy absorption, and operating temperature. Series differences do not affect circuit performance or compatibility.

Q: Are the "X2855" suffix variants functionally different? A: No. The X2855 suffix indicates a specific packaging reel configuration for automated assembly. Electrical and mechanical specifications are identical to parts without this suffix.

Q: Which substitute offers the best supply availability? A: V120ZS6PX2855 currently maintains the highest inventory level at 1193 pieces, followed by V120ZT6P at 1153 pieces. Both are active products with confirmed production status.

Q: Can I use tape & reel packaged parts in manual assembly applications? A: Yes. Tape & reel packaged parts can be manually extracted and used in through-hole applications. The disc 14mm form factor and lead configuration remain identical to bulk-packaged versions.

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

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