V250LT4 Equivalent & Substitute Parts

Part Overview

The V250LT4 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 production and maintenance requirements. Active alternatives with identical electrical and mechanical specifications are available from the same manufacturer across different packaging formats and series designations.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the V250LT4 is determined by strict equivalence across all electrical parameters and mechanical form factor. The following criteria define valid substitutes:

Varistor voltage range: 351 V (Min) to 429 V (Max)
Surge current capacity: 1.2 kA
Maximum AC/DC voltage ratings: 250 V AC / 330 V DC
Energy dissipation: 21 J
Package form: Disc 7mm through-hole configuration
Capacitance: 90 pF @ 1 MHz
Temperature operating range: -55°C to 85°C

All substitute parts listed maintain identical electrical performance and physical dimensions. Differences exist only in series designation (LT, LS, LU), packaging format (Cut Tape or Tape & Reel), and product status (Active vs. Obsolete).

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Packaging	Varistor Voltage (Typ)	Surge Current	Max AC / DC Volts	Energy	Package Type	Inventory (Pcs)
V250LT4	Littelfuse Inc.	LT	Obsolete	—	390 V	1.2 kA	250 V / 330 V	21 J	Disc 7mm	918
V250LS4P	Littelfuse Inc.	LS	Active	Cut Tape (CT)	390 V	1.2 kA	250 V / 330 V	21 J	Disc 7mm	4862
V250LS4PX2855	Littelfuse Inc.	LS	Active	Tape & Reel (TR)	390 V	1.2 kA	250 V / 330 V	21 J	Disc 7mm	670
V250LT4P	Littelfuse Inc.	LT	Active	Cut Tape (CT)	390 V	1.2 kA	250 V / 330 V	21 J	Disc 7mm	7035
V250LT4PX2855	Littelfuse Inc.	LT	Active	Tape & Reel (TR)	390 V	1.2 kA	250 V / 330 V	21 J	Disc 7mm	977
V250LU4P	Littelfuse Inc.	LU	Active	Tape & Reel (TR)	390 V	1.2 kA	250 V / 330 V	21 J	Disc 7mm	1106
V250LU4PX2855	Littelfuse Inc.	LU	Active	Tape & Reel (TR)	390 V	1.2 kA	250 V / 330 V	21 J	Disc 7mm	708

Engineering Selection Recommendations

All listed substitute parts are manufactured by Littelfuse Inc. and carry Active product status, ensuring long-term availability and supply chain continuity. The V250LT4 original part is classified as Obsolete.

For new designs and production continuity, V250LT4P (Cut Tape format, 7035 units in stock) or V250LT4PX2855 (Tape & Reel format, 977 units in stock) are direct series equivalents with identical electrical characteristics and the same LT series designation as the original part.

Alternative series options V250LS4P, V250LS4PX2855, V250LU4P, and V250LU4PX2855 provide equivalent electrical performance and mechanical compatibility. Selection between series variants depends on assembly process requirements and packaging format preferences (Cut Tape vs. Tape & Reel).

All substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental certifications.

Frequently Asked Questions (FAQ)

Q: Can V250LT4 be directly replaced with V250LT4P? A: Yes. V250LT4P is an active equivalent with identical electrical parameters (390 V typical varistor voltage, 1.2 kA surge current, 21 J energy) and mechanical form factor (Disc 7mm through-hole). The primary difference is product status (Active vs. Obsolete) and packaging format availability.

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. Electrical and mechanical specifications are identical; selection depends on assembly process capability.

Q: Are V250LS4P and V250LU4P interchangeable with V250LT4? A: Yes. All three series (LT, LS, LU) share identical electrical specifications and physical dimensions. Series designation reflects internal manufacturing or quality assurance variations within Littelfuse's product line. Substitution is electrically and mechanically valid.

Q: Does switching from V250LT4 to an active substitute require circuit redesign? A: No. All substitute parts maintain the same electrical parameters, voltage ratings, surge current capacity, and operating temperature range. No circuit modifications are required.

Q: Which substitute part offers the best inventory availability? A: V250LT4P (Cut Tape format) has the highest inventory level at 7035 units, followed by V250LS4P at 4862 units. Both are Active status parts suitable for immediate procurement.

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