Littelfuse V250LS20A Equivalent & Substitute Parts

Part Overview

The Littelfuse V250LS20A is a 390 V, 4.5 kA disc varistor designed for transient voltage suppression in through-hole applications. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance requirements. The varistor provides protection against voltage transients with a typical varistor voltage of 390 V and energy absorption capacity of 72 J.

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	4.5 kA
Energy Absorption	72 J
Number of Circuits	1
Capacitance @ 1 MHz	500 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 14mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the V250LS20A is determined by strict equivalence across the following parameters:

Maximum AC Volts: 250 V
Maximum DC Volts: 330 V
Varistor Voltage (Typical): 390 V
Varistor Voltage Range: 351 V – 429 V
Current - Surge: 4.5 kA
Energy Absorption: 72 J
Number of Circuits: 1
Capacitance @ 1 MHz: 500 pF
Operating Temperature Range: -55°C to 85°C
Mounting Type: Through Hole
Package / Case: Disc 14mm
RoHS Status: ROHS3 Compliant

All substitute parts listed maintain identical electrical and mechanical specifications. Differences exist only in packaging format (Cut Tape, Tape & Reel) and product series designation (LS, LT, LU). All substitute parts are classified as Active products, ensuring continued availability and support.

Parameter Comparison

Part Number	Manufacturer	Series	Packaging	Product Status	Max AC (V)	Max DC (V)	Varistor Voltage Typ (V)	Surge Current (kA)	Energy (J)	Capacitance @ 1 MHz (pF)	Operating Temp (°C)	RoHS	Inventory (Pcs)
V250LS20A	Littelfuse Inc.	LS	—	Obsolete	250	330	390	4.5	72	500	-55 to 85	ROHS3	868
V250LS20AP	Littelfuse Inc.	LS	Cut Tape (CT)	Active	250	330	390	4.5	72	500	-55 to 85	ROHS3	10349
V250LS20APX2855	Littelfuse Inc.	LS	Tape & Reel (TR)	Active	250	330	390	4.5	72	500	-55 to 85	ROHS3	908
V250LT20AP	Littelfuse Inc.	LT	Cut Tape (CT)	Active	250	330	390	4.5	72	500	-55 to 85	ROHS3	3600
V250LU20AP	Littelfuse Inc.	LU	Tape & Reel (TR)	Active	250	330	390	4.5	72	500	-55 to 85	ROHS3	839
V250LU20APX2855	Littelfuse Inc.	LU	Tape & Reel (TR)	Active	250	330	390	4.5	72	500	-55 to 85	ROHS3	1112

Engineering Selection Recommendations

All substitute parts are manufactured by Littelfuse Inc. and maintain full electrical and mechanical equivalence to the V250LS20A. Selection among substitute options is determined by packaging and availability requirements:

V250LS20AP (Cut Tape) and V250LS20APX2855 (Tape & Reel) maintain the original LS series designation with the highest inventory availability (10,349 and 908 units respectively). Both are Active products with ROHS3 compliance and REACH Unaffected status.

V250LT20AP (Cut Tape) offers the largest inventory stock at 3,600 units while maintaining Active product status and full specification equivalence.

V250LU20AP and V250LU20APX2855 (both Tape & Reel) represent alternative series options with Active status and equivalent electrical performance.

All substitute parts are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), ensuring compatibility with standard manufacturing and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can V250LS20AP be used as a direct replacement for V250LS20A?

A: Yes. V250LS20AP is a parametric equivalent with identical electrical specifications (250 V AC, 330 V DC, 390 V typical varistor voltage, 4.5 kA surge current, 72 J energy). The primary difference is packaging format (Cut Tape versus unspecified original packaging) and product status (Active versus Obsolete).

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape packaging is supplied in individual strips suitable for manual or semi-automated assembly. Tape & Reel packaging is wound on reels for high-speed automated pick-and-place equipment. Both formats contain identical components with identical electrical specifications.

Q: Are the LS, LT, and LU series variants interchangeable?

A: Yes, for this application. All three series variants (V250LS20A, V250LT20AP, V250LU20AP) maintain identical electrical and mechanical parameters. Series designation reflects internal Littelfuse manufacturing or quality classification but does not affect functional performance in circuit applications.

Q: Does packaging format affect component performance?

A: No. Packaging format (Cut Tape or Tape & Reel) does not affect electrical performance, operating temperature range, or surge current capacity. Selection is based on assembly process requirements and equipment compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the compliance profile of the original V250LS20A.

Q: Which substitute part offers the best availability?

A: V250LS20AP (Cut Tape) offers the highest inventory at 10,349 units. V250LT20AP (Cut Tape) provides the second-highest availability at 3,600 units.

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