V385LA40B Equivalent & Substitute Parts

Part Overview

The V385LA40B is a 620 V, 6.5 kA disc varistor manufactured by Littelfuse Inc. in the LA series. This transient voltage suppressor is designed for through-hole mounting in a 20mm disc package and operates across a temperature range of -55°C to 85°C. The main part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	620 V
Current - Surge	6.5 kA
Maximum AC Volts	385 V
Maximum DC Volts	505 V
Energy	160 J
Mounting Type	Through Hole
Package / Case	Disc 20mm
Operating Temperature	-55°C ~ 85°C
Capacitance @ 1 MHz	700 pF
Number of Circuits	1

Substitute Part Grouping Explanation

Substitution for the V385LA40B is determined by strict equivalence across all electrical and mechanical parameters. The following criteria define valid substitutes:

Varistor voltage range: 558 V (Min) to 682 V (Max), with 620 V typical
Surge current capacity: 6.5 kA
Energy rating: 160 J
Mounting configuration: Through hole, disc 20mm package
Operating temperature range: -55°C to 85°C
Capacitance: 700 pF @ 1 MHz
Single circuit configuration

Substitute parts are grouped into two categories: direct manufacturer equivalents from Littelfuse Inc. (LA and LC series variants with different packaging codes) and cross-manufacturer equivalents from Harris Corporation. All substitutes maintain identical electrical performance and physical form factor.

Parameter Comparison

Part Number	Manufacturer	Series	Status	Varistor Voltage (Typ)	Surge Current	Energy	Package	RoHS	Inventory
V385LA40B	Littelfuse Inc.	LA	Obsolete	620 V	6.5 kA	160 J	Disc 20mm	ROHS3 Compliant	845 Pcs
V385LA40BP	Littelfuse Inc.	LA	Active	620 V	6.5 kA	160 J	Disc 20mm	ROHS3 Compliant	1560 Pcs
V385LA40BPX10	Littelfuse Inc.	LA	Active	620 V	6.5 kA	160 J	Disc 20mm	ROHS3 Compliant	812 Pcs
V385LA40BPX1347	Littelfuse Inc.	LA	Active	620 V	6.5 kA	160 J	Disc 20mm	ROHS3 Compliant	698 Pcs
V385LC40BP	Littelfuse Inc.	LC	Active	620 V	6.5 kA	160 J	Disc 20mm	ROHS3 Compliant	1045 Pcs
V385LC40BPX10	Littelfuse Inc.	LC	Active	620 V	6.5 kA	160 J	Disc 20mm	ROHS3 Compliant	960 Pcs
V385LC40BPX2855	Littelfuse Inc.	LC	Active	620 V	6.5 kA	160 J	Disc 20mm	ROHS3 Compliant	1095 Pcs
V385LA40B	Harris Corporation	LA	Active	620 V	6.5 kA	160 J	Disc 20mm	RoHS non-compliant	1939 Pcs

Engineering Selection Recommendations

For new designs and ongoing procurement, V385LA40BP from Littelfuse Inc. is the primary recommended substitute. This part maintains active product status, ROHS3 compliance, and highest inventory availability (1560 Pcs). The LA series variants with packaging codes (V385LA40BPX10, V385LA40BPX1347) are functionally equivalent and suitable where specific packaging or distribution requirements apply.

The LC series variants (V385LC40BP, V385LC40BPX10, V385LC40BPX2855) from Littelfuse Inc. are parametrically equivalent alternatives with active status and ROHS3 compliance. These parts differ only in series designation and packaging code, with no impact on electrical performance or mechanical compatibility.

The Harris Corporation V385LA40B variant is electrically and mechanically equivalent but carries RoHS non-compliance status and undefined REACH compliance. This part is suitable only for applications where RoHS compliance is not required.

Frequently Asked Questions (FAQ)

Q: Can V385LA40BP directly replace the obsolete V385LA40B? A: Yes. V385LA40BP is a direct manufacturer equivalent with identical electrical parameters (620 V typical varistor voltage, 6.5 kA surge current, 160 J energy) and physical form factor (through-hole, disc 20mm). The primary difference is active product status and ROHS3 compliance.

Q: What is the difference between LA and LC series variants? A: LA and LC series designations indicate different internal construction or manufacturing processes within Littelfuse Inc.'s varistor product line. All provided LA and LC variants maintain identical electrical specifications and package dimensions, making them interchangeable for this application.

Q: Do packaging codes (BPX10, BPX1347, BPX2855) affect electrical performance? A: No. Packaging codes indicate distribution packaging quantity or configuration only. All variants with the same electrical specifications are functionally equivalent in circuit operation.

Q: Is the Harris Corporation V385LA40B suitable for RoHS-regulated applications? A: No. The Harris Corporation variant is RoHS non-compliant. For applications requiring RoHS compliance, use Littelfuse Inc. parts marked ROHS3 Compliant.

Q: What inventory considerations apply to substitute selection? A: Littelfuse Inc. V385LC40BPX2855 offers the highest inventory among LC series (1095 Pcs), while V385LA40BP offers the highest among LA series (1560 Pcs). All active substitutes maintain sufficient stock for procurement.

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