V300LU4 Equivalent & Substitute Parts

Part Overview

The V300LU4 is a 470 V, 1.2 kA varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole applications. This component features a disc form factor with 7mm package dimensions and is rated for operating temperatures from -55°C to 85°C. The V300LU4 is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity.

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
Number of Circuits	1
Capacitance @ 1 MHz	70 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the V300LU4 is determined by strict equivalence across the following electrical and mechanical parameters:

Varistor voltage range: 423 V (minimum) to 517 V (maximum)
Surge current rating: 1.2 kA
Maximum AC and DC voltage ratings: 300 V AC / 405 V DC
Energy dissipation: 25 J
Single circuit configuration
Through-hole mounting technology
Operating temperature range: -55°C to 85°C
RoHS3 compliance

All substitute parts listed maintain identical electrical performance specifications and environmental ratings. Differences exist only in series designation (LU, LS, LT), package form factor (7mm or 20mm disc), and packaging method (bulk, cut tape, or tape & reel).

Parameter Comparison

Part Number	Series	Package / Case	Packaging Type	Product Status	Varistor Voltage (Typ)	Current - Surge	Max AC / DC Volts	Energy	Operating Temp
V300LU4	LU	Disc 7mm	Bulk	Obsolete	470 V	1.2 kA	300 V / 405 V	25 J	-55°C to 85°C
V300LU4P	LU	Disc 20mm	Tape & Reel	Active	470 V	1.2 kA	300 V / 405 V	25 J	-55°C to 85°C
V300LS4P	LS	Disc 7mm	Cut Tape	Active	470 V	1.2 kA	300 V / 405 V	25 J	-55°C to 85°C
V300LS4PX2855	LS	Disc 7mm	Tape & Reel	Active	470 V	1.2 kA	300 V / 405 V	25 J	-55°C to 85°C
V300LT4P	LT	Disc 7mm	Cut Tape	Active	470 V	1.2 kA	300 V / 405 V	25 J	-55°C to 85°C
V300LT4PX2855	LT	Disc 7mm	Tape & Reel	Active	470 V	1.2 kA	300 V / 405 V	25 J	-55°C to 85°C
V300LU4PX2855	LU	Disc 7mm	Tape & Reel	Active	470 V	1.2 kA	300 V / 405 V	25 J	-55°C to 85°C

Engineering Selection Recommendations

All substitute parts maintain full electrical and thermal equivalence to the V300LU4. Selection among active alternatives should be based on the following factors:

Product Status: The V300LU4 is obsolete. All listed substitutes carry active product status, ensuring long-term availability and supply chain continuity.

Compliance: All substitute parts are ROHS3 compliant with MSL rating of 1 (unlimited moisture sensitivity level), matching the original component's environmental specifications.

Package Considerations: The V300LU4 uses a 7mm disc form factor. Substitutes V300LS4P, V300LS4PX2855, V300LT4P, V300LT4PX2855, and V300LU4PX2855 maintain this 7mm package geometry for direct mechanical compatibility. The V300LU4P variant uses a 20mm disc package and requires mechanical re-evaluation for board layout compatibility.

Packaging Method: Selection between cut tape (CT), tape & reel (TR), and bulk packaging depends on assembly process requirements and order quantities. All electrical performance remains identical across packaging variants.

Frequently Asked Questions (FAQ)

Q: Can V300LU4 substitutes be used interchangeably in existing designs?

A: Yes, all listed substitutes maintain identical electrical specifications (470 V typical varistor voltage, 1.2 kA surge current, 25 J energy rating) and operating temperature range (-55°C to 85°C). Mechanical compatibility is preserved for parts using the 7mm disc package. The V300LU4P with 20mm package requires board layout verification.

Q: What is the difference between series designations (LU, LS, LT)?

A: Series designation reflects internal manufacturing or design revision within Littelfuse's product line. All three series (LU, LS, LT) are electrically equivalent for this voltage and current rating, with identical performance parameters.

Q: How do packaging types (bulk, cut tape, tape & reel) affect component selection?

A: Packaging type does not affect electrical or thermal performance. Selection depends on assembly process: bulk packaging for manual assembly, cut tape for semi-automated processes, and tape & reel for high-volume automated assembly. All variants deliver the same component specifications.

Q: Is the V300LU4P with 20mm package a direct substitute?

A: The V300LU4P is electrically equivalent but uses a 20mm disc package instead of the original 7mm. This requires verification of board layout and mounting hole spacing before implementation.

Q: Are all substitutes ROHS3 compliant?

A: Yes, all substitute parts listed carry ROHS3 compliance certification, matching the original V300LU4 environmental standard.

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