Littelfuse V33ZA2 Varistor 33V 500A Equivalent & Substitute Parts

Part Overview

The Littelfuse V33ZA2 is a 33V 500A disc varistor designed for transient voltage suppression in through-hole applications. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The V33ZA2 series provides single-circuit transient voltage protection with a 10mm disc form factor suitable for legacy and current production environments.

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

Substitute Part Grouping Explanation

Substitute parts for the V33ZA2 are classified based on parametric equivalence. All substitute parts maintain identical electrical specifications: 33V typical varistor voltage, 500A surge current, 3J energy rating, and 3495 pF capacitance at 1 MHz. All substitutes share the same through-hole disc 10mm package configuration and operating temperature range of -55°C to 85°C.

Substitution is valid when the following parameters match exactly:

Varistor Voltage (Min/Typ/Max): 29.7V / 33V / 36.3V
Current - Surge: 500 A
Energy: 3 J
Capacitance @ 1 MHz: 3495 pF
Mounting Type: Through Hole
Package / Case: Disc 10mm
Number of Circuits: 1

The V33ZA2P represents the direct manufacturer equivalent in bulk packaging with active product status. The V33ZA2PX1347, V33ZA2PX2855, V33ZC2P, and V33ZC2PX2855 are parametric equivalents with identical electrical and mechanical specifications but different series designations or packaging variants.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Varistor Voltage (Typ)	Surge Current	Energy	Capacitance @ 1 MHz	Packaging	Inventory (Pcs)	RoHS Status
V33ZA2	Littelfuse Inc.	ZA	Obsolete	33 V	500 A	3 J	3495 pF	Disc 10mm	1198	ROHS3 Compliant
V33ZA2P	Littelfuse	ZA	Active	33 V	500 A	3 J	3495 pF	Bulk	3400	ROHS3 Compliant
V33ZA2PX1347	Littelfuse Inc.	ZA	Active	33 V	500 A	3 J	3495 pF	Bulk	623	ROHS3 Compliant
V33ZA2PX2855	Littelfuse Inc.	ZA	Active	33 V	500 A	3 J	3495 pF	Bulk	812	ROHS3 Compliant
V33ZC2P	Littelfuse Inc.	ZC	Active	33 V	500 A	3 J	3495 pF	Bulk	866	ROHS3 Compliant
V33ZC2PX2855	Littelfuse Inc.	ZC	Active	33 V	500 A	3 J	3495 pF	Bulk	788	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently using the obsolete V33ZA2, the V33ZA2P is the primary direct substitute. This part maintains identical electrical and mechanical specifications while offering active product status and higher inventory availability (3400 pcs vs. 1198 pcs).

The parametric equivalents V33ZA2PX1347 and V33ZA2PX2855 are functionally interchangeable alternatives within the ZA series. Both parts are active and ROHS3 compliant, with adequate inventory levels for production use.

The V33ZC2P and V33ZC2PX2855 represent cross-series alternatives from the ZC series. These parts deliver identical electrical performance and mechanical compatibility while maintaining ROHS3 compliance and active product status.

All substitute parts carry REACH Unaffected status where specified, ensuring compliance with environmental regulations. Selection between available substitutes should prioritize inventory availability and internal supply chain preferences, as all parts are electrically and mechanically equivalent.

Frequently Asked Questions (FAQ)

Q: Can V33ZA2P directly replace the obsolete V33ZA2? A: Yes. The V33ZA2P is a direct manufacturer equivalent with identical electrical specifications (33V varistor voltage, 500A surge current, 3J energy) and mechanical configuration (through-hole disc 10mm package). The primary difference is packaging format (bulk vs. original) and active product status.

Q: What is the difference between V33ZA2PX1347 and V33ZA2PX2855? A: Both parts are parametric equivalents within the ZA series with identical electrical and mechanical specifications. The alphanumeric suffixes (X1347, X2855) indicate different manufacturing or packaging variants. Electrical performance and pin compatibility are equivalent.

Q: Are the ZC series parts (V33ZC2P, V33ZC2PX2855) compatible with ZA series applications? A: Yes. The ZC series substitutes maintain all critical electrical parameters: 33V varistor voltage, 500A surge current, 3J energy, and 3495 pF capacitance at 1 MHz. The through-hole disc 10mm package and operating temperature range are identical, ensuring mechanical and functional compatibility.

Q: What packaging differences exist between substitute parts? A: The original V33ZA2 was supplied in standard packaging. All listed substitutes are available in bulk packaging format. This distinction affects procurement and handling but does not impact electrical or mechanical performance.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed carry ROHS3 compliance certification, meeting environmental and regulatory requirements for current production applications.

Q: Which substitute part offers the best inventory availability? A: The V33ZA2P offers the highest inventory level at 3400 pcs, followed by V33ZC2P at 866 pcs and V33ZA2PX2855 at 812 pcs. Inventory levels should be verified at time of procurement.

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