V320LA40B Equivalent & Substitute Parts

Part Overview

The V320LA40B is a 501 V, 6.5 kA disc varistor manufactured by Littelfuse Inc. in the LA series. This through-hole component is designed for transient voltage suppression applications with a 20mm disc package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring similar electrical performance characteristics.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution for the V320LA40B is determined by matching the following critical electrical and mechanical parameters:

Maximum AC Volts: 320 V
Maximum DC Volts: 420 V
Varistor Voltage (Typical): 501 V
Current - Surge: 6.5 kA
Energy: 150 J
Mounting Type: Through Hole
Package / Case: Disc 20mm
Operating Temperature Range: -55°C ~ 85°C

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents (Littelfuse LA and LC Series): Parts V320LA40BP, V320LA40BPX10, V320LA40BPX10X2855, V320LA40BPX1347, V320LA40BPX2855, V320LC40BP, V320LC40BPX10, and V320LC40BPX2855 meet all electrical and mechanical parameters. These parts differ only in packaging configuration (bulk vs. tape/reel variants) and series designation (LA vs. LC). All are active products with ROHS3 compliance.

Parametric Equivalent (Alternative Manufacturer): The ERZ-V20D471 from Panasonic Electronic Components operates at a lower varistor voltage (470 V typical) and higher surge current (10 kA) with increased energy rating (350 J). This part is suitable only when the application can tolerate these parameter variations.

Cross-Series Equivalent (Harris Corporation): The V320LS40B from Harris Corporation matches all electrical parameters but carries RoHS non-compliance status and MSL rating of 3 (168 Hours), requiring environmental controls during storage and handling.

Parameter Comparison

Part Number	Manufacturer	Series	Max AC (V)	Max DC (V)	Varistor Voltage Typ (V)	Surge Current (kA)	Energy (J)	Package	Status	RoHS
V320LA40B	Littelfuse Inc.	LA	320	420	501	6.5	150	Disc 20mm	Obsolete	ROHS3
V320LA40BP	Littelfuse	LA	320	420	501	6.5	150	Disc 20mm	Active	ROHS3
V320LA40BPX10	Littelfuse Inc.	LA	320	420	501	6.5	150	Disc 20mm	Active	ROHS3
V320LA40BPX10X2855	Littelfuse Inc.	LA	320	420	501	6.5	150	Disc 20mm	Active	ROHS3
V320LA40BPX1347	Littelfuse Inc.	LA	320	420	501	6.5	150	Disc 20mm	Active	ROHS3
V320LA40BPX2855	Littelfuse Inc.	LA	320	420	501	6.5	150	Disc 20mm	Active	ROHS3
V320LC40BP	Littelfuse Inc.	LC	320	420	501	6.5	150	Disc 20mm	Active	ROHS3
V320LC40BPX10	Littelfuse	LC	320	420	501	6.5	150	Disc 20mm	Active	ROHS3
V320LC40BPX2855	Littelfuse Inc.	LC	320	420	501	6.5	150	Disc 20mm	Active	ROHS3
ERZ-V20D471	Panasonic Electronic Components	ZNR®	300	385	470	10	350	Disc 21.5mm	Active	ROHS3
V320LS40B	Harris Corporation	LS	320	420	501	6.5	150	Disc 20mm	Active	Non-compliant

Engineering Selection Recommendations

Primary Substitutes (Littelfuse LA and LC Series): V320LA40BP, V320LA40BPX10, V320LA40BPX10X2855, V320LA40BPX1347, V320LA40BPX2855, V320LC40BP, V320LC40BPX10, and V320LC40BPX2855 are the preferred alternatives. All are active products with identical electrical specifications and ROHS3 compliance. Selection among these variants depends on packaging requirements: bulk packaging for V320LA40BP and V320LC40BP, or tape/reel configurations for the BPX variants. Inventory availability ranges from 612 to 2762 pieces across variants.

Secondary Substitute (Panasonic ERZ-V20D471): This part is suitable only when application requirements permit operation at 470 V typical varistor voltage (31 V lower than the V320LA40B) and 385 V maximum DC (35 V lower). The higher surge current rating (10 kA vs. 6.5 kA) and increased energy capacity (350 J vs. 150 J) may provide additional margin in some applications. Package size differs at 21.5mm versus 20mm. ROHS3 compliance is maintained.

Alternative (Harris V320LS40B): This part matches all electrical parameters but is RoHS non-compliant and carries MSL rating 3, requiring controlled storage conditions (168-hour maximum exposure at 60% relative humidity and 30°C). Use only when RoHS compliance is not mandated and environmental controls are implemented.

Frequently Asked Questions (FAQ)

Q: Can I use V320LA40BP as a direct replacement for V320LA40B?

A: Yes. V320LA40BP is electrically and mechanically identical to V320LA40B. The primary difference is product status (active vs. obsolete) and packaging format (bulk). All electrical parameters, operating temperature range, and compliance certifications match.

Q: What is the difference between V320LA40BP and V320LC40BP?

A: Both parts are electrically identical with matching voltage ratings, surge current, and energy specifications. The difference is the series designation (LA vs. LC). Both are active Littelfuse products with ROHS3 compliance. Selection can be based on packaging availability and inventory.

Q: Can I substitute ERZ-V20D471 for V320LA40B?

A: ERZ-V20D471 is a parametric equivalent only. It operates at 470 V typical varistor voltage versus 501 V for the V320LA40B, representing a 6% reduction. Maximum DC voltage is 385 V versus 420 V. Surge current is higher at 10 kA. Use this part only if the application can tolerate these electrical variations and the 21.5mm package size is acceptable.

Q: What does the BPX designation mean in part numbers like V320LA40BPX10?

A: The BPX suffix indicates tape/reel packaging configuration. V320LA40BP is bulk packaging, while V320LA40BPX10 and similar variants are tape/reel formats. Electrical specifications are identical; packaging format differs based on manufacturing and distribution requirements.

Q: Is V320LS40B from Harris Corporation a suitable replacement?

A: V320LS40B matches all electrical parameters but is RoHS non-compliant. It carries MSL rating 3, requiring environmental controls during storage and handling (maximum 168 hours at 60% relative humidity and 30°C). Use only when RoHS compliance is not required and environmental controls are implemented.

Q: What is the operating temperature range for substitute parts?

A: Littelfuse LA, LC, and Harris LS series parts operate from -55°C to 85°C. Panasonic ERZ-V20D471 operates from -40°C to 85°C, providing a narrower low-temperature range.

Q: Are all substitute parts ROHS3 compliant?

A: Littelfuse LA and LC series parts and Panasonic ERZ-V20D471 are ROHS3 compliant. Harris V320LS40B is RoHS non-compliant and requires compliance verification before use in regulated applications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message