V33ZS1 Equivalent & Substitute Parts

Part Overview

The V33ZS1 is a 33 V, 250 A Transient Voltage Suppressor (TVS) varistor manufactured by Littelfuse Inc. in a through-hole disc 7mm package. This component is classified as obsolete, though functionally equivalent active alternatives are available. The V33ZS1 remains in stock (832 pcs), but sourcing from active product lines ensures long-term availability and supply chain continuity for new designs and production runs.

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

Substitute Part Grouping Explanation

Substitution of the V33ZS1 is determined by electrical and mechanical parameter equivalence. All substitute parts maintain identical specifications across the following critical parameters:

Varistor voltage range: 29.7 V (Min) to 36.3 V (Max), with 33 V typical
Surge current rating: 250 A
Maximum AC/DC voltage ratings: 20 V AC / 26 V DC
Energy absorption: 1.2 J
Capacitance: 1875 pF @ 1 MHz
Operating temperature: -55°C to 85°C
Physical form factor: Through-hole disc 7mm package
Compliance: ROHS3 Compliant, MSL 1 (Unlimited)

Substitutes differ only in packaging format (Cut Tape vs. Tape & Reel) and product series designation (ZS, ZT, ZU), with all variants maintaining active product status and full regulatory compliance.

Parameter Comparison

Part Number	Manufacturer	Series	Packaging	Product Status	Varistor Voltage (Typ)	Surge Current	Max AC Volts	Max DC Volts	Energy	Capacitance @ 1 MHz	Operating Temp	RoHS Status	Inventory
V33ZS1	Littelfuse Inc.	ZS	Bulk	Obsolete	33 V	250 A	20 V	26 V	1.2 J	1875 pF	-55°C to 85°C	ROHS3	832 pcs
V33ZS1P	Littelfuse Inc.	ZS	Cut Tape (CT)	Active	33 V	250 A	20 V	26 V	1.2 J	1875 pF	-55°C to 85°C	ROHS3	3074 pcs
V33ZS1PX2855	Littelfuse	ZS	Tape & Reel (TR)	Active	33 V	250 A	20 V	26 V	1.2 J	1875 pF	-55°C to 85°C	ROHS3	748 pcs
V33ZT1P	Littelfuse Inc.	ZT	Cut Tape (CT)	Active	33 V	250 A	20 V	26 V	1.2 J	1875 pF	-55°C to 85°C	ROHS3	10011 pcs
V33ZT1PX2855	Littelfuse Inc.	ZT	Tape & Reel (TR)	Active	33 V	250 A	20 V	26 V	1.2 J	1875 pF	-55°C to 85°C	ROHS3	1063 pcs
V33ZU1P	Littelfuse Inc.	ZU	Tape & Reel (TR)	Active	33 V	250 A	20 V	26 V	1.2 J	1875 pF	-55°C to 85°C	ROHS3	1016 pcs
V33ZU1PX2855	Littelfuse Inc.	ZU	Tape & Reel (TR)	Active	33 V	250 A	20 V	26 V	1.2 J	1875 pF	-55°C to 85°C	ROHS3	693 pcs

Engineering Selection Recommendations

All substitute parts are manufactured by Littelfuse Inc. and carry active product status, ensuring ongoing support and supply availability. The V33ZS1P and V33ZS1PX2855 maintain the same ZS series designation as the original part, differing only in packaging format. The V33ZT1P, V33ZT1PX2855, V33ZU1P, and V33ZU1PX2855 represent alternative series within the same electrical specification envelope.

For new production designs, active parts (V33ZS1P, V33ZT1P, V33ZU1P) are preferred over the obsolete V33ZS1. Selection between Cut Tape and Tape & Reel packaging depends on assembly process requirements. All alternatives maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, supporting both manual and automated assembly workflows.

Frequently Asked Questions (FAQ)

Q: Can V33ZT1P or V33ZU1P be used as direct replacements for V33ZS1?

A: Yes. All substitute parts maintain identical electrical parameters (33 V typical varistor voltage, 250 A surge current, 1.2 J energy) and physical form factor (through-hole disc 7mm). Series designation (ZS, ZT, ZU) does not affect electrical performance within the specified parameter ranges.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape packaging is supplied in individual strips suitable for manual assembly or small-volume pick-and-place operations. Tape & Reel packaging is wound on reels for high-volume automated assembly lines. Electrical specifications are identical; packaging selection depends on production volume and assembly equipment.

Q: Why is V33ZS1 listed as obsolete?

A: The V33ZS1 has been superseded by active product variants (V33ZS1P, V33ZT1P, V33ZU1P) that maintain identical electrical and mechanical specifications. Littelfuse continues to support these active alternatives for long-term supply continuity.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant status and MSL 1 (Unlimited) moisture sensitivity rating, meeting current environmental and reliability standards.

Q: Can packaging format be mixed within a single assembly?

A: Yes. Cut Tape and Tape & Reel variants of the same electrical specification can be used interchangeably in circuit design. Packaging selection is a manufacturing and logistics decision, not an electrical compatibility issue.

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