V320LS20A Equivalent & Substitute Parts

Part Overview

The V320LS20A is a 510 V, 4.5 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 ROHS3 compliant with MSL 1 rating. The V320LS20A carries an obsolete product status. Equivalent and substitute parts are available in active product status with identical electrical and mechanical specifications, differing primarily in packaging configuration and series designation.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	510 V
Varistor Voltage Range	459 V – 561 V
Current - Surge	4.5 kA
Maximum AC Volts	320 V
Maximum DC Volts	420 V
Energy	80 J
Number of Circuits	1
Capacitance @ 1 MHz	380 pF
Operating Temperature	-55°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Disc 14mm
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the V320LS20A are classified as parametric equivalents based on the following criteria:

Electrical Parameters (Must Match):

Varistor Voltage (Typ): 510 V
Varistor Voltage Range: 459 V – 561 V
Current - Surge: 4.5 kA
Maximum AC Volts: 320 V
Maximum DC Volts: 420 V
Energy: 80 J
Number of Circuits: 1
Capacitance @ 1 MHz: 380 pF
Operating Temperature: -55°C ~ 85°C

Mechanical Parameters (Must Match):

Mounting Type: Through Hole
Package / Case: Disc 14mm

Allowed Variations:

Series designation (LS, LT, LU)
Packaging format (Cut Tape, Tape & Reel)
Product status (Active vs. Obsolete)

All substitute parts maintain identical electrical performance and physical form factor, ensuring direct functional replacement in circuit applications.

Parameter Comparison

Part Number	Manufacturer	Series	Packaging	Product Status	Varistor Voltage (Typ)	Current - Surge	Max AC / DC Volts	Energy	Operating Temp	Inventory
V320LS20A	Littelfuse Inc.	LS	Bulk	Obsolete	510 V	4.5 kA	320 V / 420 V	80 J	-55°C ~ 85°C	1098 Pcs
V320LS20AP	Littelfuse Inc.	LS	Cut Tape (CT)	Active	510 V	4.5 kA	320 V / 420 V	80 J	-55°C ~ 85°C	3633 Pcs
V320LS20APX1347	Littelfuse Inc.	LS	Tape & Reel (TR)	Active	510 V	4.5 kA	320 V / 420 V	80 J	-55°C ~ 85°C	881 Pcs
V320LS20APX2855	Littelfuse Inc.	LS	Tape & Reel (TR)	Active	510 V	4.5 kA	320 V / 420 V	80 J	-55°C ~ 85°C	800 Pcs
V320LT20AP	Littelfuse Inc.	LT	Cut Tape (CT)	Active	510 V	4.5 kA	320 V / 420 V	80 J	-55°C ~ 85°C	671 Pcs
V320LT20APX2855	Littelfuse	LT	Tape & Reel (TR)	Active	510 V	4.5 kA	320 V / 420 V	80 J	-55°C ~ 85°C	741 Pcs
V320LU20AP	Littelfuse Inc.	LU	Tape & Reel (TR)	Active	510 V	4.5 kA	320 V / 420 V	80 J	-55°C ~ 85°C	3500 Pcs
V320LU20APX2855	Littelfuse Inc.	LU	Tape & Reel (TR)	Active	510 V	4.5 kA	320 V / 420 V	80 J	-55°C ~ 85°C	970 Pcs

Engineering Selection Recommendations

All substitute parts listed maintain full electrical and mechanical equivalence to the V320LS20A. Selection criteria should be based on:

Product Status: All substitute parts carry Active product status, ensuring long-term availability and manufacturing support compared to the obsolete V320LS20A.

Compliance & Certifications: All parts are ROHS3 compliant with MSL 1 rating and identical ECCN (EAR99) and HTSUS (8533.40.4000) classifications.

Packaging Considerations:

Cut Tape (CT) format: V320LS20AP, V320LT20AP — suitable for manual assembly and small-volume applications
Tape & Reel (TR) format: V320LS20APX1347, V320LS20APX2855, V320LT20APX2855, V320LU20AP, V320LU20APX2855 — optimized for automated pick-and-place assembly

Series Designation: LS, LT, and LU series variants are electrically and mechanically interchangeable. Series selection does not affect circuit performance.

Inventory Availability: V320LS20AP (3633 Pcs) and V320LU20AP (3500 Pcs) offer highest stock levels for immediate procurement.

Frequently Asked Questions (FAQ)

Q: Can I substitute V320LS20A with any of the listed parts? A: Yes. All listed parts are parametric equivalents with identical electrical specifications (510 V varistor voltage, 4.5 kA surge current, 80 J energy) and mechanical form factor (Through Hole, Disc 14mm). Substitution is direct and does not require circuit redesign.

Q: What is the difference between LS, LT, and LU series? A: Series designation represents internal manufacturing variants within Littelfuse's varistor product line. All three series maintain identical electrical and mechanical parameters for this voltage and current rating. Series selection does not affect circuit performance or compatibility.

Q: Does packaging format affect electrical performance? A: No. Cut Tape (CT) and Tape & Reel (TR) packaging formats are mechanical variations only. Electrical specifications remain identical. Selection should be based on assembly process requirements: CT for manual assembly, TR for automated assembly.

Q: Why is V320LS20A marked as obsolete? A: The V320LS20A is obsolete but functionally replaced by active equivalents. All substitute parts provide identical performance with continued manufacturing support and availability.

Q: Are all parts ROHS3 compliant? A: Yes. All parts listed, including the obsolete V320LS20A, are ROHS3 compliant with MSL 1 rating and REACH Unaffected status (where specified).

Q: Which part should I select for new designs? A: For new designs, select from active parts with preferred packaging: V320LS20AP (Cut Tape) for manual assembly or V320LS20APX2855 (Tape & Reel) for automated assembly. Both maintain highest inventory availability and active product status.

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