V510LS40A Equivalent & Substitute Parts

Part Overview

The Littelfuse V510LS40A is a 820 V varistor rated for 4.5 kA surge current in a through-hole disc 14mm package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The substitute parts listed maintain identical electrical performance and mechanical compatibility while offering active product status and improved availability.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	820 V
Varistor Voltage Range	738 V – 902 V
Current - Surge	4.5 kA
Maximum AC Volts	510 V
Maximum DC Volts	675 V
Energy	110 J
Number of Circuits	1
Capacitance @ 1 MHz	250 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 14mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

All substitute parts for the V510LS40A maintain identical electrical specifications across the critical parameters that define varistor functionality and interchangeability:

Varistor voltage range (738 V – 902 V typical 820 V)
Surge current rating (4.5 kA)
Maximum AC and DC voltage ratings (510 V AC / 675 V DC)
Energy absorption capacity (110 J)
Operating temperature range (-55°C to 85°C)
Physical form factor (through-hole disc 14mm)
Compliance certifications (ROHS3, EAR99, HTSUS 8533.40.4000)

Substitutes are differentiated by series designation (LS, LT, LU) and packaging format (bulk or tape & reel with X2855 designation). These variations do not affect electrical performance or mechanical fit.

Parameter Comparison

Part Number	Series	Packaging	Product Status	Varistor Voltage (Typ)	Surge Current	Max AC / DC Volts	Energy	Inventory (Pcs)
V510LS40A	LS	Bulk	Obsolete	820 V	4.5 kA	510 V / 675 V	110 J	1089
V510LS40AP	LS	Tape & Reel	Active	820 V	4.5 kA	510 V / 675 V	110 J	899
V510LS40APX2855	LS	Tape & Reel	Active	820 V	4.5 kA	510 V / 675 V	110 J	863
V510LT40AP	LT	Tape & Reel	Active	820 V	4.5 kA	510 V / 675 V	110 J	727
V510LT40APX2855	LT	Tape & Reel	Active	820 V	4.5 kA	510 V / 675 V	110 J	962
V510LU40AP	LU	Tape & Reel	Active	820 V	4.5 kA	510 V / 675 V	110 J	1119
V510LU40APX2855	LU	Tape & Reel	Active	820 V	4.5 kA	510 V / 675 V	110 J	684

Engineering Selection Recommendations

All substitute parts are ROHS3 compliant and carry REACH Unaffected status, meeting current environmental and regulatory requirements. The primary selection criterion is product status: the original V510LS40A is obsolete, while all listed substitutes maintain active status with Littelfuse.

For new designs or ongoing procurement, select from active parts based on packaging requirements. Tape & reel packaging (AP and APX2855 variants) is standard for automated assembly. Bulk packaging is no longer available in active variants. Series selection (LS, LT, LU) does not affect electrical performance and may be chosen based on supplier availability or internal standardization practices.

Frequently Asked Questions (FAQ)

Q: Can V510LT40AP or V510LU40AP be used as direct replacements for V510LS40A?

A: Yes. All substitute parts maintain identical electrical specifications (820 V typical varistor voltage, 4.5 kA surge current, 110 J energy) and physical form factor (through-hole disc 14mm). Series designation does not affect performance.

Q: What is the difference between V510LS40AP and V510LS40APX2855?

A: Both parts are electrically identical. The X2855 designation indicates a specific tape & reel packaging configuration. Selection depends on assembly equipment compatibility and internal procurement standards.

Q: Why is the original V510LS40A listed as obsolete?

A: Product obsolescence is a manufacturer lifecycle designation. Active substitute parts with identical specifications are available for design continuity and new procurement.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed parts carry ROHS3 Compliant status and REACH Unaffected designation, meeting current environmental regulations.

Q: Does packaging format affect electrical performance?

A: No. Bulk and tape & reel packaging formats do not alter electrical characteristics. Packaging selection is based on assembly process requirements and procurement volume.

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