Littelfuse V300LT2 Varistor: Equivalent & Substitute Parts

Part Overview

The Littelfuse V300LT2 is a 490 V, 1.2 kA disc varistor designed for transient voltage suppression in through-hole applications. This part is classified as obsolete, making identification of active equivalent alternatives essential for ongoing production and maintenance requirements. Substitute parts maintain identical electrical and mechanical specifications while offering current product status and improved supply chain availability.

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
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

Substitution of the V300LT2 is determined by strict equivalence across all critical electrical parameters: varistor voltage range (441 V minimum to 539 V maximum), surge current rating (1.2 kA), energy absorption (25 J), and mechanical form factor (through-hole disc 7mm). All identified substitutes maintain these specifications without deviation. Substitutes are grouped into two categories:

Direct Manufacturer Substitutes: Parts with identical series designation and packaging format change only.

Parametric Equivalents: Parts from alternative series (LS, LU) that maintain all electrical and mechanical specifications while offering different internal construction or lead configuration options.

Parameter Comparison

Part Number	Manufacturer	Series	Varistor Voltage (Typ)	Surge Current	Energy	Package	Mounting	Product Status	Inventory (Pcs)
V300LT2	Littelfuse Inc.	LT	490 V	1.2 kA	25 J	Disc 7mm	Through Hole	Obsolete	1030
V300LT2P	Littelfuse Inc.	LT	490 V	1.2 kA	25 J	Disc 7mm	Through Hole	Active	880
V300LS2P	Littelfuse Inc.	LS	490 V	1.2 kA	25 J	Disc 7mm	Through Hole	Active	989
V300LS2PX2855	Littelfuse Inc.	LS	490 V	1.2 kA	25 J	Disc 7mm	Through Hole	Active	655
V300LT2PX2855	Littelfuse Inc.	LT	490 V	1.2 kA	25 J	Disc 7mm	Through Hole	Active	634
V300LU2P	Littelfuse Inc.	LU	490 V	1.2 kA	25 J	Disc 7mm	Through Hole	Active	731
V300LU2PX2855	Littelfuse Inc.	LU	490 V	1.2 kA	25 J	Disc 7mm	Through Hole	Active	1149

Engineering Selection Recommendations

All substitute parts listed maintain full electrical and mechanical compatibility with the V300LT2. Selection should prioritize active product status parts to ensure long-term supply chain stability. V300LT2P represents the direct successor within the LT series and is recommended as the primary replacement for existing V300LT2 designs. Parametric equivalents from the LS and LU series provide alternative sourcing options while maintaining identical performance specifications and compliance certifications (ROHS3, EAR99, HTSUS 8533.40.4000). All substitutes carry REACH Unaffected status, confirming regulatory alignment with current environmental standards.

Frequently Asked Questions (FAQ)

Q: Can V300LT2 be directly replaced with V300LT2P? A: Yes. V300LT2P is the active production equivalent of the obsolete V300LT2. Both parts share identical electrical specifications (490 V typical varistor voltage, 1.2 kA surge current, 25 J energy) and mechanical form factor (through-hole disc 7mm). The only difference is packaging format: V300LT2 uses bulk packaging while V300LT2P is supplied in tape and reel format.

Q: What is the difference between LT, LS, and LU series variants? A: Series designation indicates internal construction or lead configuration differences within the Littelfuse varistor product line. All three series (LT, LS, LU) maintain identical electrical performance for the 490 V, 1.2 kA specification. Selection between series is based on manufacturing process preference or specific application requirements not defined by electrical parameters.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 Compliant certification, confirming compliance with Restriction of Hazardous Substances Directive requirements.

Q: Can packaging format affect circuit performance? A: No. Packaging format (bulk versus tape and reel) does not affect electrical or mechanical performance. Format selection is determined by assembly process requirements and inventory management practices.

Q: What is the significance of the X2855 suffix in part numbers? A: The X2855 suffix indicates a specific packaging or lead configuration variant within the same electrical specification. Parts with and without this suffix maintain identical electrical parameters and are functionally equivalent.

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