V320LS40B Equivalent & Substitute Parts

Part Overview

The V320LS40B is a 501 V, 6.5 kA disc varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole applications. This component is classified as obsolete, which necessitates identification of active equivalent alternatives that maintain identical electrical and mechanical specifications. Substitute parts are available from Littelfuse in active product status across multiple packaging configurations.

Key Parameters

Parameter	Value
Maximum AC Volts	320 V
Maximum DC Volts	420 V
Varistor Voltage (Typical)	501 V
Varistor Voltage Range	462 V – 540 V
Current - Surge	6.5 kA
Energy	150 J
Number of Circuits	1
Capacitance @ 1 MHz	750 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 20mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the V320LS40B is determined by strict equivalence across all critical electrical parameters: maximum AC/DC voltage ratings, varistor voltage range (462 V – 540 V typical 501 V), surge current capacity (6.5 kA), energy dissipation (150 J), and physical form factor (through-hole disc 20mm). All substitute parts maintain identical specifications across these parameters. Substitutes differ only in series designation (LS, LT, LU) and packaging configuration (Cut Tape, Tape & Reel with various reel sizes). Series and packaging variations do not affect electrical performance or mechanical compatibility in the application.

Parameter Comparison

Part Number	Series	Packaging	Product Status	Max AC (V)	Max DC (V)	Varistor Voltage Typ (V)	Surge Current (kA)	Energy (J)	Inventory (Pcs)
V320LS40B	LS	Bulk	Obsolete	320	420	501	6.5	150	962
V320LS40BP	LS	Cut Tape (CT)	Active	320	420	501	6.5	150	3429
V320LS40BPX10	LS	Tape & Reel (TR)	Active	320	420	501	6.5	150	1365
V320LS40BPX2855	LS	Tape & Reel (TR)	Active	320	420	501	6.5	150	728
V320LT40BP	LT	Cut Tape (CT)	Active	320	420	501	6.5	150	5506
V320LT40BPX10	LT	Tape & Reel (TR)	Active	320	420	501	6.5	150	1007
V320LT40BPX10X2855	LT	Tape & Reel (TR)	Active	320	420	501	6.5	150	799
V320LT40BPX2855	LT	Tape & Reel (TR)	Active	320	420	501	6.5	150	1176
V320LU40BP	LU	Tape & Reel (TR)	Active	320	420	501	6.5	150	676
V320LU40BPX10	LU	Tape & Reel (TR)	Active	320	420	501	6.5	150	1050
V320LU40BPX2855	LU	Tape & Reel (TR)	Active	320	420	501	6.5	150	1012

Engineering Selection Recommendations

All listed substitute parts are manufactured by Littelfuse Inc. and maintain active product status, ensuring long-term availability and supply chain stability. All parts are ROHS3 compliant and carry identical electrical specifications. Selection between substitutes should be based on packaging requirements: Cut Tape (CT) packaging is suitable for manual assembly or low-volume production; Tape & Reel (TR) packaging with standard reel sizes (X10, X2855) is appropriate for automated assembly processes. The choice of series (LS, LT, LU) does not affect electrical or mechanical performance and may be selected based on inventory availability and lead time requirements.

Frequently Asked Questions (FAQ)

Q: Can V320LS40BP replace V320LS40B directly in the circuit? A: Yes. V320LS40BP is electrically and mechanically identical to V320LS40B. The difference is packaging format (Cut Tape vs. Bulk), which does not affect circuit performance or board-level compatibility.

Q: What is the difference between LS, LT, and LU series designations? A: Series designations (LS, LT, LU) do not represent different electrical specifications. All three series maintain identical voltage ratings, surge current capacity, and energy dissipation. Series variation reflects internal manufacturing or design revision tracking and does not impact substitutability.

Q: Which packaging format should I select for my application? A: Cut Tape (CT) packaging is standard for manual or low-volume assembly. Tape & Reel (TR) packaging with reel size designations (X10, X2855) is designed for automated pick-and-place equipment. Select based on your assembly process requirements, not electrical performance.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed carry ROHS3 compliance certification, matching the compliance status of the original V320LS40B.

Q: What is the operating temperature range for all substitutes? A: All substitute parts operate across the identical temperature range of -55°C to 85°C (TA), maintaining full electrical specifications throughout this range.

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