Littelfuse V320LT7 Equivalent & Substitute Parts

Part Overview

The Littelfuse V320LT7 is a 510 V, 1.2 kA disc varistor designed for transient voltage suppression applications. This component operates across a temperature range of -55°C to 85°C and is housed in a 7mm disc package for through-hole mounting. The V320LT7 carries an obsolete product status, making identification of active equivalent parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	510 V
Varistor Voltage Range	459 V – 561 V
Current - Surge	1.2 kA
Maximum AC Volts	320 V
Maximum DC Volts	420 V
Energy Absorption	25 J
Capacitance @ 1 MHz	65 pF
Operating Temperature	-55°C to 85°C
Package / Case	Disc 7mm
Mounting Type	Through Hole
Number of Circuits	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the V320LT7 is determined by strict electrical and mechanical parameter matching. All substitute parts maintain identical specifications across the following critical parameters:

Varistor voltage range: 459 V – 561 V (typical 510 V)
Surge current rating: 1.2 kA
Maximum AC/DC voltage ratings: 320 V AC / 420 V DC
Energy absorption: 25 J
Capacitance: 65 pF @ 1 MHz
Operating temperature: -55°C to 85°C
Package form factor: Disc 7mm through-hole
Compliance: ROHS3 Compliant, MSL 1

The substitute parts differ only in packaging configuration (Tape & Reel vs. Cut Tape) and product series designation (LS, LT, LU), with all maintaining active product status except the original V320LT7.

Parameter Comparison

Part Number	Manufacturer	Series	Packaging	Product Status	Varistor Voltage (Typ)	Surge Current	Max AC / DC Volts	Energy	Capacitance @ 1 MHz	Operating Temp	RoHS Status	Inventory
V320LT7	Littelfuse Inc.	LT	Bulk	Obsolete	510 V	1.2 kA	320 V / 420 V	25 J	65 pF	-55°C to 85°C	ROHS3	916 Pcs
V320LS7P	Littelfuse Inc.	LS	Tape & Reel	Active	510 V	1.2 kA	320 V / 420 V	25 J	65 pF	-55°C to 85°C	ROHS3	877 Pcs
V320LS7PX2855	Littelfuse Inc.	LS	Tape & Reel	Active	510 V	1.2 kA	320 V / 420 V	25 J	65 pF	-55°C to 85°C	ROHS3	999 Pcs
V320LT7P	Littelfuse	LT	Cut Tape	Active	510 V	1.2 kA	320 V / 420 V	25 J	65 pF	-55°C to 85°C	ROHS3	2002 Pcs
V320LT7PX1347	Littelfuse Inc.	LT	Tape & Reel	Active	510 V	1.2 kA	320 V / 420 V	25 J	65 pF	-55°C to 85°C	ROHS3	785 Pcs
V320LT7PX2855	Littelfuse Inc.	LT	Tape & Reel	Active	510 V	1.2 kA	320 V / 420 V	25 J	65 pF	-55°C to 85°C	ROHS3	904 Pcs
V320LU7P	Littelfuse Inc.	LU	Tape & Reel	Active	510 V	1.2 kA	320 V / 420 V	25 J	65 pF	-55°C to 85°C	ROHS3	1064 Pcs
V320LU7PX2855	Littelfuse Inc.	LU	Tape & Reel	Active	510 V	1.2 kA	320 V / 420 V	25 J	65 pF	-55°C to 85°C	ROHS3	819 Pcs

Engineering Selection Recommendations

All substitute parts listed are active products with ROHS3 compliance and identical electrical specifications to the V320LT7. Selection among substitutes should be based on packaging requirements and procurement logistics:

For automated assembly processes requiring tape-and-reel packaging, V320LS7P, V320LS7PX2855, V320LT7PX1347, V320LT7PX2855, V320LU7P, and V320LU7PX2855 are suitable. The V320LT7P offers cut-tape packaging for manual or semi-automated placement.

All parts maintain identical electrical performance and environmental compliance, ensuring direct functional interchangeability within the specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can V320LT7 substitutes be used interchangeably in existing designs?

A: Yes. All listed substitutes maintain identical electrical specifications including varistor voltage (510 V typical), surge current (1.2 kA), voltage ratings (320 V AC / 420 V DC), and operating temperature range (-55°C to 85°C). The 7mm disc through-hole package form factor is consistent across all parts.

Q: What is the difference between packaging options?

A: Packaging differences are logistical only. Tape & Reel (TR) packaging is standard for automated pick-and-place assembly. Cut Tape (CT) packaging is suitable for manual or semi-automated placement. Electrical performance is identical regardless of packaging format.

Q: Why are there multiple part numbers with similar designations?

A: Part number suffixes (X1347, X2855) and series variations (LS, LT, LU) represent internal Littelfuse manufacturing or distribution codes. All maintain identical electrical and mechanical specifications for the 510 V, 1.2 kA varistor function.

Q: Is the obsolete V320LT7 still available?

A: The V320LT7 is listed as obsolete but 916 units remain in stock. However, active substitutes with superior availability should be prioritized for new designs and ongoing procurement.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All substitute parts carry ROHS3 compliance certification with MSL 1 (Unlimited moisture sensitivity level), matching the original V320LT7 environmental specifications.

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