V300LS2 Littelfuse Varistor - Equivalent & Substitute Parts

Part Overview

The V300LS2 is a 490 V, 1.2 kA disc varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole applications. This component operates across a temperature range of -55°C to 85°C and is compliant with ROHS3 standards. The V300LS2 is classified as obsolete, making identification of active equivalent parts essential for ongoing production and maintenance applications requiring 490 V varistor protection with 1.2 kA surge current capacity.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	490 V
Current - Surge	1.2 kA
Maximum AC Volts	300 V
Maximum DC Volts	405 V
Energy	25 J
Capacitance @ 1 MHz	70 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 7mm
Number of Circuits	1

Substitute Part Grouping Explanation

Substitution of the V300LS2 is determined by strict equivalence across the following electrical and mechanical parameters:

Varistor Voltage (Min/Typ/Max): 441 V / 490 V / 539 V
Current - Surge: 1.2 kA
Maximum AC Volts: 300 V
Maximum DC Volts: 405 V
Energy: 25 J
Capacitance @ 1 MHz: 70 pF
Operating Temperature Range: -55°C to 85°C
Mounting Type: Through Hole
Package / Case: Disc 7mm
Number of Circuits: 1
RoHS Status: ROHS3 Compliant

All substitute parts listed maintain identical electrical performance specifications and mechanical form factors. Differences exist only in product status (active vs. obsolete), packaging format (bulk vs. tape & reel), and internal series designations (LS, LT, LU).

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Packaging	Varistor Voltage (Typ)	Current - Surge	Max AC Volts	Max DC Volts	Energy	Operating Temp	Package / Case	RoHS Status
V300LS2	Littelfuse Inc.	LS	Obsolete	Bulk	490 V	1.2 kA	300 V	405 V	25 J	-55°C ~ 85°C	Disc 7mm	ROHS3
V300LS2P	Littelfuse Inc.	LS	Active	Tape & Reel	490 V	1.2 kA	300 V	405 V	25 J	-55°C ~ 85°C	Disc 7mm	ROHS3
V300LS2PX2855	Littelfuse Inc.	LS	Active	Tape & Reel	490 V	1.2 kA	300 V	405 V	25 J	-55°C ~ 85°C	Disc 7mm	ROHS3
V300LT2P	Littelfuse Inc.	LT	Active	Tape & Reel	490 V	1.2 kA	300 V	405 V	25 J	-55°C ~ 85°C	Disc 7mm	ROHS3
V300LT2PX2855	Littelfuse Inc.	LT	Active	Tape & Reel	490 V	1.2 kA	300 V	405 V	25 J	-55°C ~ 85°C	Disc 7mm	ROHS3
V300LU2P	Littelfuse Inc.	LU	Active	Tape & Reel	490 V	1.2 kA	300 V	405 V	25 J	-55°C ~ 85°C	Disc 7mm	ROHS3
V300LU2PX2855	Littelfuse Inc.	LU	Active	Tape & Reel	490 V	1.2 kA	300 V	405 V	25 J	-55°C ~ 85°C	Disc 7mm	ROHS3

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical equivalence to the V300LS2. Selection among active alternatives should be based on the following criteria:

Product Status: All substitute parts carry Active product status, ensuring continued availability and manufacturing support. The V300LS2 is obsolete and should be replaced in new designs and ongoing production.

Packaging Format: The V300LS2 is supplied in bulk packaging. Substitute parts V300LS2P, V300LS2PX2855, V300LT2P, V300LT2PX2855, V300LU2P, and V300LU2PX2855 are supplied in Tape & Reel format, which is standard for automated assembly processes. Bulk-to-tape & reel conversion does not affect electrical performance.

Compliance: All substitute parts maintain ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements for electronic component procurement.

Series Designation: The LS, LT, and LU series designations represent internal Littelfuse product line classifications. All three series deliver identical electrical performance at the specified 490 V varistor voltage and 1.2 kA surge current rating.

Packaging Suffix: The "X2855" suffix indicates internal manufacturing or traceability codes and does not alter electrical or mechanical specifications.

Frequently Asked Questions (FAQ)

Q: Can V300LS2P be used as a direct replacement for V300LS2?

A: Yes. V300LS2P is electrically and mechanically identical to V300LS2. The primary difference is packaging format (tape & reel vs. bulk) and active product status. Both maintain 490 V varistor voltage, 1.2 kA surge current, and identical thermal and electrical characteristics.

Q: What is the difference between V300LS2P, V300LT2P, and V300LU2P?

A: These parts are parametrically equivalent across all electrical and mechanical specifications. The series designation (LS, LT, LU) reflects internal Littelfuse product line organization. All three deliver 490 V varistor voltage, 1.2 kA surge current, and identical operating temperature range. Selection among these variants does not affect circuit performance.

Q: Does the X2855 suffix affect compatibility?

A: No. The X2855 suffix is an internal manufacturing or traceability designation and does not alter electrical performance, mechanical dimensions, or functional characteristics. Parts with and without this suffix are fully interchangeable.

Q: Why is the V300LS2 listed as obsolete?

A: The V300LS2 has been discontinued by Littelfuse Inc. Active equivalent parts are available with identical specifications. For new designs and ongoing production, selection from the active substitute list is required.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH Unaffected status, meeting current environmental and regulatory standards for electronic component procurement.

Q: Can these varistors be used in both AC and DC circuits?

A: Yes. All parts are rated for maximum AC voltage of 300 V and maximum DC voltage of 405 V. Circuit design must ensure operating voltage does not exceed these limits.

Q: What is the capacitance specification used for?

A: The 70 pF capacitance measured at 1 MHz is a parasitic characteristic of the varistor element. This specification is relevant for high-frequency circuit analysis and EMI filtering applications where varistor capacitance may interact with circuit impedance.

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