Littelfuse V33ZS5 Equivalent & Substitute Parts

Part Overview

The Littelfuse V33ZS5 is a 33 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 6 J energy dissipation. The V33ZS5 carries an obsolete product status, making identification of active equivalent parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	33 V
Current - Surge	1 kA
Maximum AC Volts	20 V
Maximum DC Volts	26 V
Energy	6 J
Capacitance @ 1 MHz	9290 pF
Operating Temperature	-55°C to 85°C
Package / Case	Disc 14mm
Mounting Type	Through Hole
Number of Circuits	1

Substitute Part Grouping Explanation

Substitution eligibility for the V33ZS5 is determined by strict equivalence across the following parameters: varistor voltage range (29.7 V minimum to 36.3 V maximum), surge current rating (1 kA), maximum AC and DC voltage ratings (20 V AC / 26 V DC), energy dissipation capacity (6 J), capacitance at 1 MHz (9290 pF), operating temperature range (-55°C to 85°C), package form factor (Disc 14mm), and through-hole mounting configuration. All substitute parts listed maintain identical electrical and mechanical specifications to the main part. Packaging format (Tape & Reel, Cut Tape, or bulk) and product series designation (ZS, ZT, ZU) do not affect functional equivalence.

Parameter Comparison

Part Number	Manufacturer	Series	Varistor Voltage (Typ)	Surge Current	Max AC / DC Volts	Energy	Capacitance @ 1 MHz	Operating Temp	Package	Product Status	Inventory
V33ZS5	Littelfuse Inc.	ZS	33 V	1 kA	20 V / 26 V	6 J	9290 pF	-55°C to 85°C	Disc 14mm	Obsolete	845 Pcs
V33ZS5P	Littelfuse	ZS	33 V	1 kA	20 V / 26 V	6 J	9290 pF	-55°C to 85°C	Disc 14mm	Active	838 Pcs
V33ZS5PX2855	Littelfuse Inc.	ZS	33 V	1 kA	20 V / 26 V	6 J	9290 pF	-55°C to 85°C	Disc 14mm	Active	726 Pcs
V33ZT5P	Littelfuse Inc.	ZT	33 V	1 kA	20 V / 26 V	6 J	9290 pF	-55°C to 85°C	Disc 14mm	Active	1998 Pcs
V33ZT5PX2855	Littelfuse Inc.	ZT	33 V	1 kA	20 V / 26 V	6 J	9290 pF	-55°C to 85°C	Disc 14mm	Active	648 Pcs
V33ZU5P	Littelfuse	ZU	33 V	1 kA	20 V / 26 V	6 J	9290 pF	-55°C to 85°C	Disc 14mm	Active	897 Pcs
V33ZU5PX2855	Littelfuse Inc.	ZU	33 V	1 kA	20 V / 26 V	6 J	9290 pF	-55°C to 85°C	Disc 14mm	Active	739 Pcs

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical compatibility with the V33ZS5. Selection among active alternatives should prioritize parts with Active product status to ensure long-term availability and manufacturing support. V33ZS5P represents the direct series equivalent with Active status. V33ZT5P offers the highest current inventory (1998 Pcs) and is available in Cut Tape packaging for lower-volume applications. V33ZU5P and V33ZU5PX2855 provide alternative series options with equivalent performance characteristics. Parts designated with the X2855 suffix indicate Tape & Reel packaging suitable for automated assembly processes. All substitute parts comply with ROHS3 and carry identical REACH and ECCN classifications as the original component.

Frequently Asked Questions (FAQ)

Q: Can V33ZS5P directly replace V33ZS5 in existing designs? A: Yes. V33ZS5P is the direct Active equivalent of the obsolete V33ZS5, maintaining identical electrical specifications, voltage ratings, surge current capacity, and package form factor. The only difference is product status and packaging format (Tape & Reel vs. bulk).

Q: What is the difference between V33ZT5P and V33ZU5P? A: Both parts are parametric equivalents with identical electrical and mechanical specifications. The difference lies in the series designation (ZT vs. ZU). All electrical parameters, voltage ratings, surge current, energy dissipation, and package dimensions are equivalent. Selection may be based on inventory availability or packaging preference.

Q: Does the X2855 suffix affect electrical performance? A: No. The X2855 suffix indicates packaging format (Tape & Reel) and does not alter electrical characteristics. V33ZS5PX2855 and V33ZS5P are electrically identical; the suffix distinguishes packaging and handling method only.

Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts comply with ROHS3 standards and carry identical compliance certifications to the original V33ZS5.

Q: Which substitute offers the best availability? A: V33ZT5P currently maintains the highest inventory level at 1998 Pcs and is available in Cut Tape packaging for flexible procurement options.

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