V250LA4 Equivalent & Substitute Parts

Part Overview

The V250LA4 is a 390 V, 1.2 kA disc varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole applications. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The varistor provides protection across a -55°C to 85°C operating temperature range with ROHS3 compliance and unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value
Maximum AC Volts	250 V
Maximum DC Volts	330 V
Varistor Voltage (Typical)	390 V
Varistor Voltage Range	351 V – 429 V
Current - Surge	1.2 kA
Energy Absorption	21 J
Number of Circuits	1
Capacitance @ 1 MHz	90 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 7mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the V250LA4 is based on strict electrical and mechanical parameter matching. All substitute parts maintain identical specifications across the following critical parameters:

Maximum AC/DC voltage ratings (250 V AC, 330 V DC)
Varistor voltage range (351 V – 429 V, typical 390 V)
Surge current capacity (1.2 kA)
Energy absorption (21 J)
Capacitance at 1 MHz (90 pF)
Operating temperature range (-55°C to 85°C)
Through-hole mounting with 7mm disc package
ROHS3 compliance and MSL 1 rating

Substitute parts are grouped into two categories: direct packaging equivalents and parametric equivalents across different series designations (LA and LC series).

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Max AC Volts	Max DC Volts	Varistor Voltage (Typ)	Surge Current	Energy	Package	Inventory
V250LA4	Littelfuse Inc.	LA	Obsolete	250 V	330 V	390 V	1.2 kA	21 J	Disc 7mm	923 Pcs
V250LA4P	Littelfuse Inc.	LA	Active	250 V	330 V	390 V	1.2 kA	21 J	Disc 7mm	1834 Pcs
V250LA4PX2855	Littelfuse Inc.	LA	Active	250 V	330 V	390 V	1.2 kA	21 J	Disc 7mm	9925 Pcs
V250LC4P	Littelfuse Inc.	LC	Active	250 V	330 V	390 V	1.2 kA	21 J	Disc 7mm	955 Pcs
V250LC4PX2855	Littelfuse Inc.	LC	Active	250 V	330 V	390 V	1.2 kA	21 J	Disc 7mm	730 Pcs

Engineering Selection Recommendations

All four substitute parts are functionally equivalent to the V250LA4 based on electrical and mechanical parameters. Selection should prioritize product status and availability:

Primary Recommendation: V250LA4PX2855 (LA series, Active status, highest inventory at 9925 pcs). This part provides direct series continuity with the obsolete V250LA4 while maintaining active product status and superior stock availability.

Secondary Recommendation: V250LA4P (LA series, Active status, 1834 pcs available). This part offers series continuity with adequate inventory for standard procurement cycles.

Alternative Options: V250LC4P and V250LC4PX2855 (LC series, Active status) are parametrically equivalent but represent a different series designation. These parts are suitable when LA series availability is constrained.

All substitute parts carry ROHS3 compliance and REACH Unaffected status, meeting regulatory requirements for the V250LA4 application.

Frequently Asked Questions (FAQ)

Q: Can V250LA4P be used as a direct replacement for V250LA4? A: Yes. V250LA4P is electrically and mechanically identical to V250LA4, differing only in packaging designation (bulk) and product status (active vs. obsolete). It is a direct substitute.

Q: What is the difference between V250LA4PX2855 and V250LA4P? A: Both parts are electrically and mechanically identical. The X2855 designation indicates a specific manufacturing or packaging variant. Both are active products suitable for replacement applications.

Q: Can LC series parts (V250LC4P, V250LC4PX2855) replace LA series parts? A: Yes. LC series parts are parametrically equivalent to LA series parts across all electrical and mechanical specifications. Series designation does not affect functional performance in this application.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed carry ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, matching the compliance profile of the V250LA4.

Q: Which substitute part has the best availability? A: V250LA4PX2855 has the highest inventory at 9925 pcs, followed by V250LA4P at 1834 pcs.

Q: Can these parts be used interchangeably in PCB designs? A: Yes. All substitute parts use identical through-hole mounting with 7mm disc packaging, allowing direct PCB footprint compatibility with the V250LA4.

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