V320LT40B Equivalent & Substitute Parts

Part Overview

The V320LT40B 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, making equivalent substitute parts necessary for ongoing design support and procurement. The substitute parts listed maintain identical electrical and mechanical specifications while offering active product status and improved availability.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the V320LT40B is based on strict equivalence across all critical electrical parameters: varistor voltage range (462 V minimum to 540 V maximum), surge current rating (6.5 kA), energy dissipation (150 J), and mechanical form factor (Disc 20mm through-hole). All substitute parts maintain identical voltage and current specifications, operating temperature range, and compliance certifications.

Substitute parts are differentiated by series designation (LT, LS, LU) and packaging format (Cut Tape, Tape & Reel with varying reel quantities). These variations do not affect electrical performance or mechanical compatibility. The primary distinction between substitutes is product status and packaging configuration for procurement purposes.

Parameter Comparison

Part Number	Series	Packaging	Product Status	Varistor Voltage (Typ)	Surge Current	Max AC / DC Volts	Energy	Inventory (Pcs)
V320LT40B	LT	Bulk	Obsolete	501 V	6.5 kA	320 V / 420 V	150 J	895
V320LT40BP	LT	Cut Tape (CT)	Active	501 V	6.5 kA	320 V / 420 V	150 J	5506
V320LS40BP	LS	Cut Tape (CT)	Active	501 V	6.5 kA	320 V / 420 V	150 J	3429
V320LS40BPX10	LS	Tape & Reel (TR)	Active	501 V	6.5 kA	320 V / 420 V	150 J	1365
V320LS40BPX2855	LS	Tape & Reel (TR)	Active	501 V	6.5 kA	320 V / 420 V	150 J	728
V320LT40BPX10	LT	Tape & Reel (TR)	Active	501 V	6.5 kA	320 V / 420 V	150 J	1007
V320LT40BPX10X2855	LT	Tape & Reel (TR)	Active	501 V	6.5 kA	320 V / 420 V	150 J	799
V320LT40BPX2855	LT	Tape & Reel (TR)	Active	501 V	6.5 kA	320 V / 420 V	150 J	1176
V320LU40BP	LU	Tape & Reel (TR)	Active	501 V	6.5 kA	320 V / 420 V	150 J	676
V320LU40BPX10	LU	Tape & Reel (TR)	Active	501 V	6.5 kA	320 V / 420 V	150 J	1050
V320LU40BPX2855	LU	Tape & Reel (TR)	Active	501 V	6.5 kA	320 V / 420 V	150 J	1012

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and REACH unaffected status, providing long-term design support compared to the obsolete V320LT40B. Selection between substitute options depends on packaging requirements and procurement volume:

For manual assembly or low-volume applications, V320LT40BP (Cut Tape) offers the highest inventory availability at 5506 units. For automated assembly processes requiring tape and reel packaging, V320LT40BPX10 and V320LT40BPX2855 provide active LT series options with standard reel configurations. LS and LU series variants maintain identical electrical specifications and serve as parametric equivalents where series designation does not impact circuit performance.

All substitutes maintain the same through-hole disc 20mm form factor, operating temperature range, and electrical ratings, ensuring direct mechanical and electrical compatibility in existing designs.

Frequently Asked Questions (FAQ)

Q: Can V320LT40B be directly replaced with V320LT40BP? A: Yes. V320LT40BP is a direct substitute with identical electrical specifications (501 V typical, 6.5 kA surge current, 150 J energy) and mechanical form factor. The primary difference is packaging format (Cut Tape vs. bulk) and active product status.

Q: What is the difference between LT, LS, and LU series variants? A: Series designation indicates internal design variants within the Littelfuse varistor product line. All listed variants maintain identical electrical parameters for the V320 501V 6.5kA specification, making them parametric equivalents for circuit design purposes.

Q: Does packaging format (Cut Tape vs. Tape & Reel) affect electrical performance? A: No. Packaging format affects only procurement and assembly handling. Electrical and mechanical specifications remain identical across all packaging options.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All active substitute parts listed carry ROHS3 compliance certification and REACH unaffected status, meeting current environmental and regulatory requirements.

Q: Which substitute should be selected for new designs? A: V320LT40BP (Cut Tape) or V320LT40BPX10 (Tape & Reel) are recommended for new designs due to active product status and highest inventory availability. Selection between these depends on assembly process requirements.

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