Littelfuse V33ZT2 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The Littelfuse V33ZT2 is a 33 V, 500 A disc varistor designed for transient voltage suppression in through-hole applications. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications. Substitute parts are available from the same manufacturer with current product status and full compliance certifications.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	33 V
Current - Surge	500 A
Maximum AC Volts	20 V
Maximum DC Volts	26 V
Energy	3 J
Capacitance @ 1 MHz	3495 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 10mm
Number of Circuits	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the V33ZT2 are classified based on strict electrical and mechanical parameter equivalence. All substitute parts maintain identical specifications across the following critical parameters: varistor voltage range (29.7 V minimum to 36.3 V maximum, 33 V typical), surge current capacity (500 A), maximum AC and DC voltage ratings (20 V AC, 26 V DC), energy rating (3 J), capacitance (3495 pF @ 1 MHz), operating temperature range (-55°C to 85°C), through-hole mounting configuration, and 10mm disc package format.

Substitutes are differentiated by series designation (ZT, ZS, ZU) and packaging configuration (bulk versus tape & reel). All substitute parts are manufactured by Littelfuse Inc. and maintain ROHS3 compliance and MSL 1 rating. The primary distinction between the main part and substitutes is product status: V33ZT2 is obsolete, while all listed substitutes maintain active product status with current availability.

Parameter Comparison

Part Number	Series	Packaging	Product Status	Varistor Voltage (Typ)	Surge Current	Max AC / DC Volts	Energy	Inventory (Pcs)
V33ZT2	ZT	Bulk	Obsolete	33 V	500 A	20 V / 26 V	3 J	1165
V33ZT2P	ZT	Tape & Reel	Active	33 V	500 A	20 V / 26 V	3 J	791
V33ZT2PX2855	ZT	Tape & Reel	Active	33 V	500 A	20 V / 26 V	3 J	733
V33ZS2P	ZS	Tape & Reel	Active	33 V	500 A	20 V / 26 V	3 J	846
V33ZS2PX1347	ZS	Tape & Reel	Active	33 V	500 A	20 V / 26 V	3 J	961
V33ZS2PX2855	ZS	Tape & Reel	Active	33 V	500 A	20 V / 26 V	3 J	840
V33ZU2P	ZU	Tape & Reel	Active	33 V	500 A	20 V / 26 V	3 J	819
V33ZU2PX2855	ZU	Tape & Reel	Active	33 V	500 A	20 V / 26 V	3 J	812

Engineering Selection Recommendations

For applications currently using the obsolete V33ZT2, direct substitution is supported by V33ZT2P, which maintains identical series designation and electrical specifications while offering active product status and tape & reel packaging for automated assembly environments.

For applications requiring alternative series options, V33ZS2P, V33ZS2PX1347, V33ZS2PX2855, V33ZU2P, and V33ZU2PX2855 provide parametric equivalence across all critical electrical and mechanical parameters. All substitute parts carry ROHS3 compliance and MSL 1 rating, ensuring compatibility with current manufacturing and environmental standards.

Selection between substitute options should be based on packaging requirements (tape & reel variants with X-suffix designations indicate specific reel configurations) and inventory availability. All listed substitutes are manufactured by Littelfuse Inc. and maintain active product status with current supply availability.

Frequently Asked Questions (FAQ)

Q: Can V33ZT2P directly replace V33ZT2 in existing designs? A: Yes. V33ZT2P maintains identical electrical specifications (33 V varistor voltage, 500 A surge current, 3 J energy) and mechanical configuration (through-hole, 10mm disc package). The primary difference is packaging format: V33ZT2 is supplied in bulk, while V33ZT2P is supplied in tape & reel format. Both are suitable for through-hole assembly.

Q: What is the difference between ZT, ZS, and ZU series designations? A: Series designations (ZT, ZS, ZU) represent different product lines within the Littelfuse varistor portfolio. For the V33 voltage class at 500 A surge rating, all three series maintain identical electrical and mechanical specifications. Series selection is based on availability and supply chain requirements rather than performance differentiation.

Q: Are the X-suffix variants (PX1347, PX2855) electrically equivalent? A: Yes. X-suffix designations indicate specific reel configurations for tape & reel packaging and do not affect electrical performance. All variants maintain identical varistor voltage, surge current, energy rating, and operating temperature specifications.

Q: Can these parts be used interchangeably in automated assembly? A: All substitute parts are supplied in tape & reel format (except the original V33ZT2 bulk packaging) and are compatible with standard pick-and-place equipment. Reel configuration variants (X-suffix designations) may require equipment-specific feeder adjustments but do not affect component functionality.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 rating, meeting current environmental and manufacturing standards.

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