Littelfuse V33ZU1 Equivalent & Substitute Parts

Part Overview

The Littelfuse V33ZU1 is a 33 V, 250 A transient voltage suppressor varistor in a through-hole disc 7mm package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. Active alternatives maintain identical electrical performance and mechanical compatibility while offering improved product availability and supply chain continuity.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	33 V
Current - Surge	250 A
Maximum AC Volts	20 V
Maximum DC Volts	26 V
Energy	1.2 J
Capacitance @ 1 MHz	1875 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 7mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the V33ZU1 is determined by strict equivalence across all critical electrical and mechanical parameters. The following criteria establish valid substitutes:

Varistor voltage range: 29.7 V (Min) to 36.3 V (Max)
Surge current capacity: 250 A
Energy rating: 1.2 J
Capacitance: 1875 pF @ 1 MHz
Operating temperature: -55°C to 85°C
Package form factor: Disc 7mm through-hole
Compliance: ROHS3 Compliant, MSL 1

All substitute parts listed maintain these parameters without deviation. Packaging format (bulk, cut tape, or tape & reel) does not affect electrical or mechanical compatibility and represents the only variable among qualified substitutes.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Packaging	Varistor Voltage (Typ)	Surge Current	Energy	Capacitance @ 1 MHz	Inventory (Pcs)
V33ZU1	Littelfuse Inc.	ZU	Obsolete	Bulk	33 V	250 A	1.2 J	1875 pF	1104
V33ZU1P	Littelfuse Inc.	ZU	Active	Tape & Reel (TR)	33 V	250 A	1.2 J	1875 pF	1016
V33ZS1P	Littelfuse Inc.	ZS	Active	Cut Tape (CT)	33 V	250 A	1.2 J	1875 pF	3074
V33ZS1PX2855	Littelfuse	ZS	Active	Tape & Reel (TR)	33 V	250 A	1.2 J	1875 pF	748
V33ZT1P	Littelfuse Inc.	ZT	Active	Cut Tape (CT)	33 V	250 A	1.2 J	1875 pF	10011
V33ZT1PX2855	Littelfuse Inc.	ZT	Active	Tape & Reel (TR)	33 V	250 A	1.2 J	1875 pF	1063
V33ZU1PX2855	Littelfuse Inc.	ZU	Active	Tape & Reel (TR)	33 V	250 A	1.2 J	1875 pF	693

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and REACH unaffected status, providing regulatory continuity for new designs and production runs. The V33ZU1 obsolete status necessitates transition to an active equivalent.

Selection among active substitutes should be based on packaging requirements and inventory availability:

V33ZT1P offers the highest inventory level (10011 pcs) in cut tape format, suitable for automated assembly processes.
V33ZU1P and V33ZU1PX2855 maintain the original ZU series designation in tape & reel packaging, providing direct series continuity.
V33ZS1P and V33ZS1PX2855 represent the ZS series alternative with comparable availability in both cut tape and tape & reel formats.
V33ZT1PX2855 provides tape & reel packaging in the ZT series with active status.

All substitutes are electrically and mechanically interchangeable with the obsolete V33ZU1 across the specified parameter range.

Frequently Asked Questions (FAQ)

Q: Can V33ZU1 be directly replaced with any of the listed substitutes?

A: Yes. All listed parts maintain identical electrical parameters (33 V varistor voltage, 250 A surge current, 1.2 J energy) and mechanical form factor (disc 7mm through-hole). Substitution is valid without circuit modification.

Q: What is the difference between packaging formats (bulk, cut tape, tape & reel)?

A: Packaging format affects handling and assembly method only. Bulk packaging is suitable for manual assembly. Cut tape is used for semi-automated processes. Tape & reel format is optimized for fully automated pick-and-place assembly. Electrical and mechanical performance is identical across all formats.

Q: Why are there multiple series designations (ZU, ZS, ZT)?

A: Series designation indicates internal manufacturing process or design revision. All series variants listed maintain identical electrical specifications and are fully interchangeable. Series designation does not affect performance or compatibility.

Q: Is REACH compliance status relevant for substitution?

A: Yes. The obsolete V33ZU1 does not specify REACH status. All active substitutes are REACH unaffected, ensuring regulatory compliance for new designs and procurement in regions where REACH compliance is required.

Q: Which substitute offers the best availability?

A: V33ZT1P (ZT series, cut tape format) has the highest inventory level at 10011 pcs, providing optimal supply chain continuity for high-volume applications.

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