V320LT10 Equivalent & Substitute Parts

Part Overview

The V320LT10 is a 510 V, 2.5 kA disc varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole applications. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance requirements. Substitute parts maintain identical electrical and mechanical specifications while offering active product status and improved availability.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	510 V
Current - Surge	2.5 kA
Maximum AC Volts	320 V
Maximum DC Volts	420 V
Energy	48 J
Mounting Type	Through Hole
Package / Case	Disc 10mm
Operating Temperature Range	-55°C to 85°C
Capacitance @ 1 MHz	170 pF
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

All substitute parts for V320LT10 are qualified based on the following criteria:

Identical varistor voltage range: 459 V (Min) to 561 V (Max), with 510 V typical
Identical surge current rating: 2.5 kA
Identical energy absorption: 48 J
Identical AC/DC voltage ratings: 320 V AC / 420 V DC
Identical physical form factor: Disc 10mm through-hole package
Identical operating temperature range: -55°C to 85°C
Identical capacitance specification: 170 pF @ 1 MHz
ROHS3 compliance maintained across all substitutes

Substitutes differ only in series designation (LT, LS, LU) and packaging format (bulk vs. Tape & Reel), with no impact on electrical performance or mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Packaging	Varistor Voltage (Typ)	Surge Current	Max AC / DC Volts	Energy	Inventory (Pcs)
V320LT10	Littelfuse Inc.	LT	Obsolete	Bulk	510 V	2.5 kA	320 V / 420 V	48 J	752
V320LT10P	Littelfuse Inc.	LT	Active	Tape & Reel	510 V	2.5 kA	320 V / 420 V	48 J	992
V320LS10P	Littelfuse Inc.	LS	Active	Tape & Reel	510 V	2.5 kA	320 V / 420 V	48 J	630
V320LS10PX2855	Littelfuse Inc.	LS	Active	Tape & Reel	510 V	2.5 kA	320 V / 420 V	48 J	716
V320LT10PX2855	Littelfuse Inc.	LT	Active	Tape & Reel	510 V	2.5 kA	320 V / 420 V	48 J	921
V320LU10P	Littelfuse Inc.	LU	Active	Tape & Reel	510 V	2.5 kA	320 V / 420 V	48 J	903
V320LU10PX2855	Littelfuse Inc.	LU	Active	Tape & Reel	510 V	2.5 kA	320 V / 420 V	48 J	1095

Engineering Selection Recommendations

For applications currently using V320LT10, direct substitution is supported by V320LT10P, which maintains the LT series designation while transitioning to active product status and Tape & Reel packaging. This part provides the shortest qualification path for existing designs.

Alternative series options (LS and LU) are parametrically equivalent and fully interchangeable from an electrical and mechanical standpoint. Series selection should be based on internal design standards and supply chain preferences, as all variants maintain identical performance characteristics and compliance certifications.

All substitute parts carry ROHS3 compliance and REACH Unaffected status, ensuring regulatory alignment with current environmental standards. Moisture Sensitivity Level (MSL) 1 applies uniformly across all parts, indicating unlimited shelf life under standard storage conditions.

Frequently Asked Questions (FAQ)

Q: Can V320LT10 be directly replaced with V320LT10P?

A: Yes. V320LT10P is the direct active equivalent, maintaining identical electrical specifications and series designation. The only difference is packaging format (Tape & Reel vs. bulk) and active product status.

Q: Are LS and LU series parts fully compatible with LT series applications?

A: Yes. All three series (LT, LS, LU) share identical electrical parameters, voltage ratings, surge current capacity, and physical form factor. Series designation reflects internal Littelfuse manufacturing classification and does not affect functional performance or mechanical fit.

Q: What is the difference between standard and X2855 packaging variants?

A: The X2855 designation indicates a specific packaging configuration within the Tape & Reel format. Both standard and X2855 variants maintain identical electrical and mechanical specifications. Selection depends on assembly equipment compatibility and internal procurement standards.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, ensuring compatibility with current environmental regulations and procurement requirements.

Q: What is the shelf life for these varistors?

A: All parts are classified as Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life under standard storage conditions. No special moisture control measures are required.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes. All substitute parts maintain the identical Disc 10mm through-hole package and mounting footprint, allowing direct PCB compatibility without design modification.

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