V300LS20A Equivalent & Substitute Parts

Part Overview

The V300LS20A is a 470 V, 4.5 kA disc varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole applications. This component is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications. Substitute parts are available across multiple series designations (LS, LT, LU) and packaging configurations (Cut Tape, Tape & Reel) from the same manufacturer, all meeting current product status requirements.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	470 V
Current - Surge	4.5 kA
Maximum AC Volts	300 V
Maximum DC Volts	405 V
Energy	77 J
Mounting Type	Through Hole
Package / Case	Disc 14mm
Operating Temperature Range	-55°C to 85°C
Capacitance @ 1 MHz	400 pF
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the V300LS20A is determined by strict equivalence across the following parameters:

Varistor Voltage range: 423 V (Min) to 517 V (Max), with 470 V typical
Current - Surge rating: 4.5 kA
Maximum AC/DC voltage ratings: 300 V AC, 405 V DC
Energy dissipation: 77 J
Mounting configuration: Through Hole
Physical package: Disc 14mm
Operating temperature: -55°C to 85°C
Capacitance: 400 pF @ 1 MHz

All substitute parts listed maintain these electrical and mechanical parameters without deviation. Differences exist only in series designation (LS, LT, LU) and packaging format (Cut Tape vs. Tape & Reel), which do not affect functional performance in the application circuit.

Parameter Comparison

Part Number	Series	Packaging	Product Status	Varistor Voltage (Typ)	Current - Surge	Max AC Volts	Max DC Volts	Energy	Inventory (Pcs)
V300LS20A	LS	Bulk	Obsolete	470 V	4.5 kA	300 V	405 V	77 J	1047
V300LS20AP	LS	Cut Tape (CT)	Active	470 V	4.5 kA	300 V	405 V	77 J	3856
V300LS20APX2855	LS	Tape & Reel (TR)	Active	470 V	4.5 kA	300 V	405 V	77 J	1070
V300LT20AP	LT	Cut Tape (CT)	Active	470 V	4.5 kA	300 V	405 V	77 J	10000
V300LT20APX2855	LT	Tape & Reel (TR)	Active	470 V	4.5 kA	300 V	405 V	77 J	818
V300LU20AP	LU	Tape & Reel (TR)	Active	470 V	4.5 kA	300 V	405 V	77 J	714
V300LU20APX2855	LU	Tape & Reel (TR)	Active	470 V	4.5 kA	300 V	405 V	77 J	1158

Engineering Selection Recommendations

All substitute parts are manufactured by Littelfuse Inc. and carry Active product status, ensuring continued availability and support. The following selection criteria apply:

For Cut Tape packaging applications: V300LS20AP or V300LT20AP are suitable direct replacements. V300LT20AP offers the highest inventory availability (10,000 units) for high-volume production requirements.

For Tape & Reel packaging applications: V300LS20APX2855, V300LT20APX2855, V300LU20AP, or V300LU20APX2855 are appropriate selections based on supply chain requirements and lead time considerations.

Compliance status: All substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), matching the original V300LS20A specifications. Series designation (LS, LT, LU) does not affect electrical performance or regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can I substitute V300LS20A with any of the listed parts without circuit modification?

A: Yes. All substitute parts maintain identical electrical parameters (470 V typical varistor voltage, 4.5 kA surge current, 77 J energy) and mechanical specifications (Through Hole, Disc 14mm package). No circuit redesign is required.

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

A: Series designation does not affect electrical performance or functional characteristics. All three series meet the same parameter specifications for this voltage and current rating. Selection should be based on packaging format and inventory availability.

Q: Does packaging format (Cut Tape vs. Tape & Reel) affect component performance?

A: No. Packaging format affects only handling, storage, and assembly processes. Electrical and mechanical performance remains identical across all packaging options.

Q: Why is V300LS20A marked as obsolete?

A: Obsolete status indicates the part is no longer in active production. Active equivalent alternatives with identical specifications are available from the same manufacturer to support continued system support and new production requirements.

Q: Which substitute part should I select for new designs?

A: For new designs, select from parts with Active product status. V300LT20AP (Cut Tape) or V300LT20APX2855 (Tape & Reel) are recommended based on highest inventory availability and active production status.

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