Littelfuse V8ZA2 Varistor 8.5V 250A Disc 10mm Equivalent & Substitute Parts

Part Overview

The Littelfuse V8ZA2 is an 8.5 V 250 A varistor in a through-hole disc 10mm package, designed for transient voltage suppression in single-circuit applications. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications. Direct substitutes are available from the same manufacturer with matching performance parameters and compliance certifications.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	8.5 V
Current - Surge	250 A
Maximum AC Volts	4 V
Maximum DC Volts	5.5 V
Energy	0.8 J
Capacitance @ 1 MHz	7000 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

Substitution of the obsolete V8ZA2 is based on strict equivalence across all electrical and mechanical parameters. The substitute parts maintain identical specifications for varistor voltage range (6 V minimum to 11 V maximum, 8.5 V typical), surge current capacity (250 A), energy rating (0.8 J), capacitance (7000 pF @ 1 MHz), temperature operating range (-55°C to 85°C), and physical form factor (through-hole disc 10mm package). All substitutes are manufactured by Littelfuse Inc. and comply with ROHS3 standards.

The substitute parts are differentiated by product status (active versus obsolete), packaging configuration (bulk versus tape), and internal manufacturing codes (PX designations). These variations do not affect electrical performance or mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Varistor Voltage (Typ)	Surge Current	Max AC Volts	Max DC Volts	Energy	Package	Inventory (Pcs)
V8ZA2	Littelfuse Inc.	ZA	Obsolete	8.5 V	250 A	4 V	5.5 V	0.8 J	Disc 10mm	728
V8ZA2P	Littelfuse Inc.	ZA	Active	8.5 V	250 A	4 V	5.5 V	0.8 J	Disc 10mm	5772
V8ZA2PX1347	Littelfuse Inc.	ZA	Active	8.5 V	250 A	4 V	5.5 V	0.8 J	Disc 10mm	1042
V8ZA2PX2855	Littelfuse Inc.	ZA	Active	8.5 V	250 A	4 V	5.5 V	0.8 J	Disc 10mm	812
V8ZC2P	Littelfuse Inc.	ZC	Active	8.5 V	250 A	4 V	5.5 V	0.8 J	Disc 10mm	1118
V8ZC2PX2855	Littelfuse Inc.	ZC	Active	8.5 V	250 A	4 V	5.5 V	0.8 J	Disc 10mm	655

Engineering Selection Recommendations

All listed substitute parts are active products manufactured by Littelfuse Inc. and maintain full compliance with ROHS3 standards and REACH regulations. The V8ZA2P represents the primary direct substitute, offering the highest inventory availability (5772 units) and identical series designation (ZA). The V8ZA2PX1347 and V8ZA2PX2855 variants provide equivalent electrical performance with manufacturing-specific coding. The V8ZC2P and V8ZC2PX2855 parts, while belonging to the ZC series, deliver identical electrical and mechanical specifications and are suitable for direct replacement applications.

Selection between substitute options should be based on procurement lead time, inventory availability, and internal supply chain requirements, as all parts satisfy the electrical and mechanical requirements of the original V8ZA2 specification.

Frequently Asked Questions (FAQ)

Q: Can V8ZA2P directly replace the obsolete V8ZA2? A: Yes. The V8ZA2P is an active product with identical electrical parameters (8.5 V typical varistor voltage, 250 A surge current, 0.8 J energy), mechanical form factor (through-hole disc 10mm), and compliance certifications (ROHS3). It is the primary recommended substitute.

Q: What is the difference between V8ZA2P and V8ZA2PX1347 or V8ZA2PX2855? A: These parts share identical electrical and mechanical specifications. The PX designations indicate internal manufacturing codes or packaging lot identifiers that do not affect performance or compatibility. All three are functionally equivalent.

Q: Can parts from the ZC series (V8ZC2P, V8ZC2PX2855) replace the ZA series V8ZA2? A: Yes. The ZC series variants maintain all electrical parameters (8.5 V typical, 250 A surge, 0.8 J energy) and physical specifications (disc 10mm through-hole package) required for direct substitution. Series designation does not indicate a performance difference in this product family.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts comply with ROHS3 standards and are REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the operating temperature range for these varistors? A: All parts, including the original V8ZA2 and all substitutes, operate across the temperature range of -55°C to 85°C (TA).

Q: Does packaging type (bulk versus tape) affect electrical performance? A: No. Packaging configuration affects only handling and assembly processes. Electrical and mechanical specifications remain identical regardless of packaging type.

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