V510LC40A Equivalent & Substitute Parts

Part Overview

The V510LC40A is a 820 V, 4.5 kA varistor manufactured by Littelfuse Inc., designed for transient voltage suppression applications. This component features a through-hole disc package (14mm) and is rated for single-circuit protection with 110 J energy absorption capability. The V510LC40A is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and procurement planning.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution for the V510LC40A is determined by strict equivalence across the following critical parameters:

Varistor voltage range (738 V minimum to 902 V maximum)
Surge current rating (4.5 kA)
Maximum AC and DC voltage ratings (510 V AC, 675 V DC)
Energy absorption capacity (110 J)
Through-hole disc package configuration (14mm)
Single-circuit design
Operating temperature range (-55°C to 85°C)

The V510LC40AP qualifies as a direct substitute based on identical electrical specifications and mechanical form factor. The primary distinction is product status: V510LC40A is obsolete, while V510LC40AP is active production.

Parameter Comparison

Parameter	V510LC40A	V510LC40AP
Manufacturer	Littelfuse Inc.	Littelfuse Inc.
Varistor Voltage (Min)	738 V	738 V
Varistor Voltage (Typ)	820 V	820 V
Varistor Voltage (Max)	902 V	902 V
Current - Surge	4.5 kA	4.5 kA
Maximum AC Volts	510 V	510 V
Maximum DC Volts	675 V	675 V
Energy	110 J	110 J
Operating Temperature	-55°C to 85°C	-55°C to 85°C
Package / Case	Disc 14mm	Disc 14mm
Mounting Type	Through Hole	Through Hole
Number of Circuits	1	1
Capacitance @ 1 MHz	250 pF	250 pF
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active

Engineering Selection Recommendations

The V510LC40AP is the direct equivalent for V510LC40A applications. Both components meet ROHS3 compliance requirements and share identical electrical and mechanical specifications. The V510LC40AP is preferred for new procurement due to active product status and confirmed inventory availability (1065 pcs). For legacy system maintenance requiring the V510LC40A, the V510LC40AP provides drop-in compatibility with no circuit redesign required.

Frequently Asked Questions (FAQ)

Q: Can V510LC40AP be used as a direct replacement for V510LC40A? A: Yes. Both parts are electrically and mechanically identical, with matching varistor voltage ratings (820 V typical), surge current capacity (4.5 kA), and through-hole disc 14mm package configuration. The V510LC40AP is the active production equivalent.

Q: What is the difference between V510LC40A and V510LC40AP? A: The V510LC40A is obsolete; V510LC40AP is active production. All electrical parameters, mechanical specifications, and compliance certifications are identical. The packaging designation differs (bulk for V510LC40AP versus standard for V510LC40A).

Q: Are there any compliance or certification differences? A: Both parts are ROHS3 compliant with MSL rating of 1 (Unlimited). The V510LC40AP includes REACH Unaffected status. No functional compliance differences exist for circuit protection applications.

Q: Can this varistor be used in both AC and DC circuits? A: Yes. The V510LC40A and V510LC40AP are rated for maximum AC voltage of 510 V and maximum DC voltage of 675 V, supporting both circuit types within specified voltage limits.

Q: What is the significance of the 14mm disc package? A: The 14mm disc package is a through-hole form factor that determines PCB footprint and mounting compatibility. Both the V510LC40A and V510LC40AP use identical 14mm disc packaging, ensuring mechanical interchangeability.

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