V300LT4 Equivalent & Substitute Parts

Part Overview

The V300LT4 is a 470 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. Parametric equivalents maintain identical electrical and mechanical specifications while offering active product status and improved availability.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	470 V
Current - Surge	1.2 kA
Maximum AC Volts	300 V
Maximum DC Volts	405 V
Energy	25 J
Mounting Type	Through Hole
Package / Case	Disc 7mm
Operating Temperature Range	-55°C to 85°C
Capacitance @ 1 MHz	70 pF
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

All substitute parts for V300LT4 are parametric equivalents manufactured by Littelfuse Inc. Substitution is determined by the following criteria:

Varistor voltage range: 423 V (Min) to 517 V (Max), with 470 V typical
Surge current rating: 1.2 kA
Energy dissipation: 25 J
Mounting configuration: Through Hole, Disc 7mm package
Operating temperature: -55°C to 85°C
Electrical characteristics: Maximum AC 300 V, Maximum DC 405 V, Capacitance 70 pF @ 1 MHz

Substitutes differ only in series designation (LT, LS, LU) and packaging format (Cut Tape or Tape & Reel), with no impact on electrical performance or mechanical fit.

Parameter Comparison

Part Number	Manufacturer	Series	Packaging	Product Status	Varistor Voltage (Typ)	Surge Current	Energy	Max AC / DC Volts	Operating Temp	Inventory (Pcs)
V300LT4	Littelfuse Inc.	LT	—	Obsolete	470 V	1.2 kA	25 J	300 V / 405 V	-55°C to 85°C	793
V300LS4P	Littelfuse Inc.	LS	Cut Tape (CT)	Active	470 V	1.2 kA	25 J	300 V / 405 V	-55°C to 85°C	20,881
V300LS4PX2855	Littelfuse Inc.	LS	Tape & Reel (TR)	Active	470 V	1.2 kA	25 J	300 V / 405 V	-55°C to 85°C	822
V300LT4P	Littelfuse Inc.	LT	Cut Tape (CT)	Active	470 V	1.2 kA	25 J	300 V / 405 V	-55°C to 85°C	11,691
V300LT4PX2855	Littelfuse	LT	Tape & Reel (TR)	Active	470 V	1.2 kA	25 J	300 V / 405 V	-55°C to 85°C	1,041
V300LU4PX2855	Littelfuse Inc.	LU	Tape & Reel (TR)	Active	470 V	1.2 kA	25 J	300 V / 405 V	-55°C to 85°C	773

Engineering Selection Recommendations

All substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), ensuring compatibility with current manufacturing and environmental standards. Selection between substitutes should be based on packaging requirements and procurement availability:

V300LS4P and V300LT4P are available in Cut Tape format for manual assembly or small-volume applications.
V300LS4PX2855, V300LT4PX2855, and V300LU4PX2855 are supplied in Tape & Reel format for automated pick-and-place assembly.
V300LS4P offers the highest inventory availability (20,881 units) for immediate procurement.
All active substitutes are functionally interchangeable with V300LT4 in circuit applications requiring 470 V varistor protection.

Frequently Asked Questions (FAQ)

Q: Can V300LS4P replace V300LT4 in existing designs? A: Yes. V300LS4P is a parametric equivalent with identical electrical specifications (470 V typical, 1.2 kA surge current, 25 J energy) and mechanical form factor (Through Hole, Disc 7mm). The series designation change (LS vs. LT) does not affect performance.

Q: What is the difference between Cut Tape and Tape & Reel packaging? A: Cut Tape (CT) packaging is suitable for manual assembly and small-quantity orders. Tape & Reel (TR) packaging is designed for automated assembly equipment. Electrical and mechanical specifications are identical; packaging choice depends on assembly process requirements.

Q: Are all substitutes ROHS3 compliant? A: Yes. All substitute parts listed maintain ROHS3 compliance and are suitable for applications requiring environmental regulation adherence.

Q: Which substitute offers the best availability? A: V300LS4P in Cut Tape format provides the highest inventory level at 20,881 units in stock.

Q: Can I use V300LU4PX2855 as a direct replacement? A: Yes. V300LU4PX2855 maintains all electrical and mechanical parameters of V300LT4. The series designation (LU) and Tape & Reel packaging are the only differences.

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