V510LC40AP Equivalent & Substitute Parts

Part Overview

The V510LC40AP is an 820 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 housed in a 14mm disc package. The part is currently active in production with 1065 units in stock. Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, supply chain considerations, or specific compliance requirements.

Key Parameters

Parameter	Value	Unit
Varistor Voltage (Typical)	820	V
Varistor Voltage Range	738 - 902	V
Maximum AC Voltage	510	V
Maximum DC Voltage	675	V
Surge Current	4.5	kA
Energy Absorption	110	J
Capacitance @ 1 MHz	250	pF
Operating Temperature Range	-55 to 85	°C
Package Type	Disc 14mm	—
Mounting Type	Through Hole	—
Number of Circuits	1	—

Substitute Part Grouping Explanation

Substitution eligibility for the V510LC40AP is determined by strict equivalence across the following critical parameters:

Varistor voltage range (738 - 902 V)
Maximum AC voltage rating (510 V)
Maximum DC voltage rating (675 V)
Surge current capacity (4.5 kA)
Energy absorption (110 J)
Capacitance at 1 MHz (250 pF)
Operating temperature range (-55°C to 85°C)
Package configuration (Disc 14mm, Through Hole, single circuit)

Two substitute parts meet these electrical and mechanical specifications: V510LA40AP (Littelfuse Inc., LA series) and V510LC40A (Harris Corporation, LC series). Both maintain identical electrical performance characteristics and physical form factors, enabling direct functional replacement in circuit applications.

Parameter Comparison

Parameter	V510LC40AP (Main)	V510LA40AP (Substitute)	V510LC40A (Substitute)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Harris Corporation
Series	LC	LA	LC
Varistor Voltage (Min)	738 V	738 V	738 V
Varistor Voltage (Typ)	820 V	820 V	820 V
Varistor Voltage (Max)	902 V	902 V	902 V
Maximum AC Volts	510 V	510 V	510 V
Maximum DC Volts	675 V	675 V	675 V
Current - Surge	4.5 kA	4.5 kA	4.5 kA
Energy	110 J	110 J	110 J
Capacitance @ 1 MHz	250 pF	250 pF	250 pF
Operating Temperature	-55°C to 85°C	-55°C to 85°C	-55°C to 85°C
Package / Case	Disc 14mm	Disc 14mm	Disc 14mm
Mounting Type	Through Hole	Through Hole	Through Hole
Number of Circuits	1	1	1
Product Status	Active	Active	Active
Current Inventory	1065 Pcs	1890 Pcs	1628 Pcs

Engineering Selection Recommendations

All three parts—V510LC40AP, V510LA40AP, and V510LC40A—are active products with identical electrical specifications and mechanical form factors. Selection between them should be based on compliance and certification status:

V510LC40AP and V510LA40AP are both ROHS3 compliant with REACH Unaffected status, making them suitable for applications requiring environmental compliance certification. Both are manufactured by Littelfuse Inc., with the primary distinction being series designation (LC versus LA).

V510LC40A (Harris Corporation) maintains equivalent electrical and mechanical specifications but carries RoHS non-compliance status and undefined REACH vendor status. This part is suitable only for applications where RoHS compliance is not a requirement. Additionally, its moisture sensitivity level (MSL 3, 168 hours) differs from the other two parts (MSL 1, unlimited), requiring consideration of storage and handling protocols.

For applications requiring RoHS3 compliance and unrestricted moisture sensitivity handling, V510LC40AP or V510LA40AP are the appropriate selections. For applications without compliance constraints, V510LC40A provides an alternative with identical electrical performance.

Frequently Asked Questions (FAQ)

Q: Can V510LA40AP be used as a direct replacement for V510LC40AP?

A: Yes. Both parts share identical electrical parameters (820 V typical varistor voltage, 4.5 kA surge current, 110 J energy absorption) and physical specifications (14mm disc, through-hole mounting). The primary difference is the series designation (LA versus LC). Both are ROHS3 compliant and REACH unaffected.

Q: What is the difference between V510LC40A and the other two substitutes?

A: V510LC40A maintains identical electrical and mechanical specifications but differs in compliance status. It is RoHS non-compliant and has MSL 3 (168-hour moisture sensitivity) versus MSL 1 (unlimited) for the other parts. Use V510LC40A only in applications where RoHS compliance is not required.

Q: Are all three parts suitable for the same circuit applications?

A: From an electrical standpoint, yes. All three parts operate at 820 V (typical), handle 4.5 kA surge current, and absorb 110 J of energy. However, compliance requirements and moisture sensitivity levels may restrict usage depending on application standards and storage conditions.

Q: What does MSL 1 versus MSL 3 mean for component handling?

A: MSL (Moisture Sensitivity Level) indicates how sensitive a component is to moisture during storage and handling. MSL 1 (unlimited) allows indefinite storage without special precautions. MSL 3 (168 hours) requires the component to be used within 168 hours of opening the original packaging if not stored in controlled humidity conditions.

Q: Can I mix these parts in the same production batch?

A: Electrically, yes. All three parts are parametrically equivalent. However, if your application requires RoHS3 compliance certification, use only V510LC40AP or V510LA40AP. If moisture sensitivity handling procedures differ between MSL 1 and MSL 3 components, maintain separate inventory and handling protocols.

Q: Which part should I select for new designs?

A: For new designs requiring compliance documentation, select V510LC40AP or V510LA40AP (both ROHS3 compliant, MSL 1). Both are actively manufactured by Littelfuse Inc. with stable inventory levels. The choice between LC and LA series depends on your supplier relationship and availability.

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