V56ZA2 Equivalent & Substitute Parts

Part Overview

The V56ZA2 is a 56 V, 250 A transient voltage suppressor varistor manufactured by Littelfuse Inc. in a through-hole disc 7mm package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The varistor provides transient voltage suppression across a single circuit with an energy rating of 2.3 J and operates across the temperature range of -55°C to 85°C.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	56 V
Current - Surge	250 A
Maximum AC Volts	35 V
Maximum DC Volts	45 V
Energy	2.3 J
Number of Circuits	1
Mounting Type	Through Hole
Package / Case	Disc 7mm
Operating Temperature	-55°C ~ 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the V56ZA2 is determined by the following critical parameters: varistor voltage (50.4 V minimum to 61.6 V maximum), surge current capacity, maximum AC and DC voltage ratings, energy dissipation capability, number of circuits, mounting type, and package form factor.

Substitute parts are grouped into three categories:

Direct Manufacturer Equivalents (Littelfuse ZA Series): Parts V56ZA2P and V56ZA2PX2855 maintain identical electrical specifications and package dimensions. These parts differ only in packaging format (bulk vs. tape/reel) and product status (active vs. obsolete).

Parametric Equivalents (Littelfuse ZC Series): Parts V56ZC2P and V56ZC2PX2855 are from the ZC series but maintain all critical electrical parameters identical to the V56ZA2, including varistor voltage range, surge current, energy rating, and package dimensions.

Manufacturer-Recommended Alternative (Panasonic): The ERZ-V07D560 is a Panasonic ZNR® varistor that meets the core voltage and circuit requirements but operates at a higher surge current rating (500 A vs. 250 A) and larger package dimension (8.5mm vs. 7mm disc).

Parameter Comparison

Parameter	V56ZA2	V56ZA2P	V56ZA2PX2855	V56ZC2P	V56ZC2PX2855	ERZ-V07D560
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse	Panasonic Electronic Components
Series	ZA	ZA	ZA	ZC	ZC	ZNR®
Product Status	Obsolete	Active	Active	Active	Active	Active
Varistor Voltage (Typ)	56 V	56 V	56 V	56 V	56 V	56 V
Varistor Voltage (Min)	50.4 V	50.4 V	50.4 V	50.4 V	50.4 V	50 V
Varistor Voltage (Max)	61.6 V	61.6 V	61.6 V	61.6 V	61.6 V	62 V
Current - Surge	250 A	250 A	250 A	250 A	250 A	500 A
Maximum AC Volts	35 V	35 V	35 V	35 V	35 V	35 V
Maximum DC Volts	45 V	45 V	45 V	45 V	45 V	45 V
Energy	2.3 J	2.3 J	2.3 J	2.3 J	2.3 J	3.4 J
Number of Circuits	1	1	1	1	1	1
Capacitance @ Frequency	1035 pF @ 1 MHz	1035 pF @ 1 MHz	1035 pF @ 1 MHz	1035 pF @ 1 MHz	1035 pF @ 1 MHz	1500 pF @ 1 kHz
Operating Temperature	-55°C ~ 85°C	-55°C ~ 85°C	-55°C ~ 85°C	-55°C ~ 85°C	-55°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Disc 7mm	Disc 7mm	Disc 7mm	Disc 7mm	Disc 7mm	Disc 8.5mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	Not specified	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete V56ZA2, the active Littelfuse parts V56ZA2P and V56ZA2PX2855 provide identical electrical and mechanical specifications. Both are ROHS3 compliant and REACH unaffected, with V56ZA2P available in bulk packaging and V56ZA2PX2855 in tape/reel format.

The Littelfuse ZC series parts V56ZC2P and V56ZC2PX2855 are functionally equivalent alternatives within the same manufacturer ecosystem, maintaining all critical electrical parameters and package dimensions while offering active product status and full compliance certifications.

The Panasonic ERZ-V07D560 is suitable for applications where higher surge current capacity (500 A) and greater energy dissipation (3.4 J) provide design margin. This part requires verification of mechanical fit due to the larger 8.5mm disc package and operates within a narrower temperature range (-40°C to 85°C vs. -55°C to 85°C).

Frequently Asked Questions (FAQ)

Q: Can V56ZA2P directly replace V56ZA2? A: Yes. V56ZA2P is the active equivalent with identical electrical specifications, varistor voltage range (50.4 V to 61.6 V), surge current (250 A), and disc 7mm package. The difference is packaging format and product status.

Q: What is the difference between V56ZA2PX2855 and V56ZA2P? A: Both parts are electrically and mechanically identical. V56ZA2PX2855 is supplied in tape/reel packaging (X2855 designation), while V56ZA2P is supplied in bulk. Selection depends on procurement and assembly requirements.

Q: Are the Littelfuse ZC series parts (V56ZC2P, V56ZC2PX2855) compatible with V56ZA2? A: Yes. The ZC series maintains all critical electrical parameters: 56 V typical varistor voltage, 250 A surge current, 2.3 J energy, and identical package dimensions. Series designation change does not affect functional compatibility.

Q: When should the Panasonic ERZ-V07D560 be used instead of Littelfuse equivalents? A: The ERZ-V07D560 is appropriate when design requirements include higher surge current capacity (500 A vs. 250 A) or greater energy dissipation (3.4 J vs. 2.3 J). The larger 8.5mm package requires PCB layout verification. The narrower operating temperature range (-40°C to 85°C) must be confirmed against application requirements.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant. Littelfuse parts also carry REACH unaffected status. Panasonic ERZ-V07D560 is ROHS3 compliant and REACH unaffected.

Q: What is the impact of the different package sizes (7mm vs. 8.5mm disc)? A: The V56ZA2 and all Littelfuse equivalents use 7mm disc packages. The Panasonic ERZ-V07D560 uses an 8.5mm disc package, requiring verification of PCB hole spacing and mechanical clearance before substitution.

Q: Can I use ERZ-V07D560 in a space-constrained application designed for 7mm disc? A: No. The 8.5mm disc package is physically larger and may not fit within the original design envelope. Mechanical compatibility must be verified before selection.

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