Littelfuse V660LS100B Varistor: Equivalent & Substitute Parts

Part Overview

The Littelfuse V660LS100B is a 1.02 kV, 6.5 kA disc varistor designed for transient voltage suppression in through-hole applications. This component operates across a temperature range of -55°C to 85°C and is rated for 660 V AC and 850 V DC maximum conditions. The V660LS100B carries an obsolete product status, making identification of active equivalent parts essential for ongoing procurement and design continuity. Substitute parts maintain identical electrical performance and mechanical form factor while offering active availability from the manufacturer.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	1.02 kV
Varistor Voltage Range	940 V – 1.1 kV
Current - Surge	6.5 kA
Maximum AC Volts	660 V
Maximum DC Volts	850 V
Energy Absorption	250 J
Capacitance @ 1 MHz	400 pF
Operating Temperature	-55°C to 85°C
Number of Circuits	1
Mounting Type	Through Hole
Package / Case	Disc 20mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the V660LS100B is determined by strict equivalence across the following critical parameters:

Varistor Voltage (Typical): 1.02 kV
Varistor Voltage Range: 940 V – 1.1 kV minimum to maximum
Current - Surge Rating: 6.5 kA
Maximum AC Volts: 660 V
Maximum DC Volts: 850 V
Energy Absorption: 250 J
Mounting Type: Through Hole
Package / Case: Disc 20mm
Operating Temperature Range: -55°C to 85°C
Compliance: ROHS3 Compliant

All substitute parts listed maintain these electrical and mechanical specifications without deviation. Packaging format (bulk versus tape & reel) and series designation (LS, LT, LU) do not affect electrical performance or circuit compatibility.

Parameter Comparison

Part Number	Series	Packaging	Product Status	Varistor Voltage (Typ)	Current - Surge	Max AC / DC Volts	Energy	Inventory (Pcs)
V660LS100B	LS	Bulk	Obsolete	1.02 kV	6.5 kA	660 V / 850 V	250 J	1043
V660LS100BP	LS	Tape & Reel	Active	1.02 kV	6.5 kA	660 V / 850 V	250 J	609
V660LS100BPX10	LS	Tape & Reel	Active	1.02 kV	6.5 kA	660 V / 850 V	250 J	1093
V660LS100BPX2855	LS	Tape & Reel	Active	1.02 kV	6.5 kA	660 V / 850 V	250 J	882
V660LT100BP	LT	Tape & Reel	Active	1.02 kV	6.5 kA	660 V / 850 V	250 J	811
V660LT100BPX10	LT	Tape & Reel	Active	1.02 kV	6.5 kA	660 V / 850 V	250 J	764
V660LT100BPX2855	LT	Tape & Reel	Active	1.02 kV	6.5 kA	660 V / 850 V	250 J	725
V660LU100BP	LU	Tape & Reel	Active	1.02 kV	6.5 kA	660 V / 850 V	250 J	802
V660LU100BPX10	LU	Tape & Reel	Active	1.02 kV	6.5 kA	660 V / 850 V	250 J	990
V660LU100BPX2855	LU	Tape & Reel	Active	1.02 kV	6.5 kA	660 V / 850 V	250 J	1021

Engineering Selection Recommendations

All listed substitute parts are manufactured by Littelfuse Inc. and maintain full electrical and mechanical equivalence to the V660LS100B. The primary distinction between options is product status and packaging format.

Direct Substitutes (Same Series - LS): V660LS100BP, V660LS100BPX10, and V660LS100BPX2855 are active variants within the LS series. These parts are direct replacements with identical electrical characteristics. The suffix designations (BP, BPX10, BPX2855) indicate packaging reel configurations and do not affect circuit performance.

Cross-Series Substitutes (LT and LU Series): V660LT100BP, V660LT100BPX10, V660LT100BPX2855, V660LU100BP, V660LU100BPX10, and V660LU100BPX2855 are parametrically equivalent alternatives from the LT and LU series. These parts deliver identical electrical performance and mechanical form factor while offering active product status and established supply availability.

Compliance and Certification: All substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating. REACH status is unaffected across all variants. ECCN and HTSUS classifications remain consistent.

Frequently Asked Questions (FAQ)

Q: Can I substitute V660LS100B with any of the listed parts without circuit redesign? A: Yes. All listed substitute parts maintain identical varistor voltage (1.02 kV typical), surge current rating (6.5 kA), maximum voltage ratings (660 V AC / 850 V DC), energy absorption (250 J), and operating temperature range (-55°C to 85°C). Through-hole mounting and 20mm disc package dimensions are preserved across all variants.

Q: What is the difference between V660LS100BP and V660LS100BPX10? A: Both parts are electrically identical. The suffix designations indicate different tape & reel packaging configurations used for automated assembly. Selection depends on procurement and assembly process requirements, not circuit performance.

Q: Why are there LS, LT, and LU series options? A: Series designation reflects internal manufacturing or design revision levels within Littelfuse's product line. All three series maintain identical electrical specifications for this voltage and current rating. Selection can be based on availability, lead time, or supply chain preference.

Q: Is the V660LS100B still available? A: The V660LS100B carries obsolete product status. Active alternatives with identical specifications are available from the LS, LT, and LU series listed in this reference.

Q: Do packaging differences (bulk versus tape & reel) affect electrical performance? A: No. Packaging format affects only procurement, storage, and assembly handling. Electrical characteristics and circuit compatibility remain unchanged between bulk and tape & reel variants.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and are suitable for applications requiring environmental and regulatory compliance certification.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message