Littelfuse V250LA2 Varistor: Equivalent & Substitute Parts

Part Overview

The Littelfuse V250LA2 is a 410 V, 1.2 kA disc varistor designed for transient voltage suppression applications. This component features a 7mm disc form factor with through-hole mounting and operates across a temperature range of -55°C to 85°C. The V250LA2 is classified as obsolete, making identification of active equivalent parts essential for ongoing production and maintenance applications. Substitute parts maintain identical electrical and mechanical specifications while offering current product status and improved supply chain availability.

Key Parameters

Parameter	Value
Maximum AC Volts	250 V
Maximum DC Volts	330 V
Varistor Voltage (Typical)	410 V
Varistor Voltage Range	369 V (Min) – 451 V (Max)
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 V250LA2 is determined by strict equivalence across all critical electrical and mechanical parameters. The following criteria define valid substitutes:

Voltage Specifications: Maximum AC volts (250 V), maximum DC volts (330 V), and varistor voltage range (369 V – 451 V typical 410 V) must match exactly
Current Rating: Surge current capacity of 1.2 kA must be maintained
Energy Absorption: 21 J energy rating must be preserved
Physical Form Factor: Disc 7mm through-hole package is mandatory
Electrical Characteristics: Capacitance at 1 MHz (90 pF) and single-circuit configuration must remain constant
Environmental Compliance: ROHS3 compliance and MSL 1 rating required

All identified substitutes meet these criteria while offering active product status and improved inventory availability compared to the obsolete V250LA2.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Max AC (V)	Max DC (V)	Varistor Voltage (V)	Surge Current (kA)	Energy (J)	Package	Inventory (Pcs)
V250LA2	Littelfuse Inc.	LA	Obsolete	250	330	410	1.2	21	Disc 7mm	943
V250LA2P	Littelfuse Inc.	LA	Active	250	330	410	1.2	21	Disc 7mm	4319
V250LA2PX2855	Littelfuse Inc.	LA	Active	250	330	410	1.2	21	Disc 7mm	853
V250LC2P	Littelfuse Inc.	LC	Active	250	330	410	1.2	21	Disc 7mm	931
V250LC2PX2855	Littelfuse Inc.	LC	Active	250	330	410	1.2	21	Disc 7mm	780

Engineering Selection Recommendations

All substitute parts listed maintain complete electrical and mechanical equivalence to the V250LA2. Selection among active alternatives should prioritize the following factors:

Product Status: V250LA2P, V250LA2PX2855, V250LC2P, and V250LC2PX2855 are all classified as active products, ensuring long-term supply chain viability and manufacturing support compared to the obsolete V250LA2.

Compliance Certifications: All substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component procurement.

Inventory Availability: V250LA2P offers the highest inventory level at 4,319 pieces, providing optimal supply security for high-volume applications. V250LC2P and V250LA2PX2855 provide secondary sourcing options with 931 and 853 pieces respectively.

Series Designation: LA series parts (V250LA2P, V250LA2PX2855) represent direct series continuations of the original V250LA2. LC series parts (V250LC2P, V250LC2PX2855) offer equivalent performance within an alternative series designation.

Frequently Asked Questions (FAQ)

Q: Can V250LA2 be directly replaced with V250LA2P? A: Yes. V250LA2P is a direct parametric equivalent with identical electrical specifications (250 V AC, 330 V DC, 410 V varistor voltage, 1.2 kA surge current, 21 J energy) and matching Disc 7mm through-hole package. The primary difference is product status: V250LA2P is active while V250LA2 is obsolete.

Q: What is the difference between LA and LC series substitutes? A: LA and LC series designations represent different product lines within Littelfuse's varistor portfolio. Both series maintain identical electrical and mechanical parameters for the 410 V, 1.2 kA rating. Selection between series is based on supply chain preference and inventory availability rather than technical performance.

Q: Are the "X2855" suffix variants electrically equivalent? A: Yes. V250LA2PX2855 and V250LC2PX2855 maintain complete electrical equivalence to their non-suffixed counterparts. The X2855 suffix indicates internal manufacturing or traceability codes and does not affect electrical performance, voltage ratings, surge current capacity, or energy absorption specifications.

Q: Can these parts be used interchangeably in existing designs? A: Yes, provided the circuit board layout accommodates the Disc 7mm through-hole package. All substitute parts share identical pin configuration, mounting footprint, and electrical characteristics. No circuit redesign is required.

Q: What compliance standards apply to these substitute parts? A: All substitute parts are ROHS3 compliant and REACH unaffected. Moisture sensitivity level is MSL 1 (unlimited), indicating no special storage or handling requirements. ECCN classification is EAR99 for all parts.

Q: Which substitute part should be selected for new designs? A: V250LA2P is recommended for new designs due to active product status, highest inventory availability (4,319 pieces), and direct LA series continuity with the original V250LA2. This selection ensures optimal long-term supply chain support and manufacturing consistency.

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