Copyright © Harris Corporation 1995
4-59
SEMICONDUCTOR
LA Series
UL Recognized Radial Lead Metal-Oxide
Varistors for Line Voltage Operation
Description
LA series transient surge suppressors are radial-lead varis-
tors that can be operated continuously across AC power
lines. These UL recognized varistors “across-the-line” com-
ponents, because of their radial lead construction, require
very little mounting space. This feature is particularly impor-
tant in compact, hard wired system designs.
Features
• Recognized as “Transient Voltage Surge Suppressors”, UL File
#E75961 to Standard 1449
• Recognized as “Across-The-Line Components”, UL File #E56529 to
Standard 1414
• Recognized as “Protectors for Data Communication and Fire Alarm
Circuits”, UL File #E135010 to Standard 497B
• Recognized as “Transient Voltage Surge Suppressors”, CSA File
#LR91788 to Standard C22.2 No. 1 - M1981
• High Energy Absorption Capability WTM . . . . . . . . . . . . . . Up to 360J
• Wide Operating Voltage Range VM(AC)RMS . . . . . . . . . . . 130V to 750V
• Line-Voltage Operation - Can be Operated Directly Across 120V,
240V, etc., AC Power Lines
• Available in Tape and Reel for Automatic Insertion Equipment
June 1995
LA series varistors are available in four model sizes: 7mm,
10mm, 14mm and 20mm; and have a VM(AC)RMS voltage
range from 130V to 1000V, and an energy absorption
capability up to 360J. Some LA series model numbers are
available with two clamping voltage selections, designated
by a model number prefix of either A or B. The “A” selection
is the standard model; the “B” selection provides a tighter
clamping voltage.
7mm, 10mm, 14mm, 20mm
LA SERIES
Absolute Maximum Ratings For ratings of individual members of a series, see Device Ratings and Specifications chart
LA SERIES UNITS
Continuous:
Steady State Applied Voltage:
AC Voltage Range (VM(AC)RMS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Voltage Range (VM(DC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 to 1000
175 to 1200 V
V
Transients:
Peak Pulse Current (ITM)
For 8/20µs Current Wave (See Figure 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Single Pulse Energy Range
For 10/1000µs Current Wave (WTM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1200 to 6500
11 to 360
A
J
Operating Ambient Temperature Range (TA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to +85 oC
Storage Temperature Range (TSTG). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to +125 oC
Temperature Coefficient (αV) of Clamping Voltage (VC) at Specified Test Current . . . . . . . . . . . . . . <0.01 %/oC
Hi-Pot Encapsulation (Isolation Voltage Capability) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(Dielectric must withstand indicated DC voltage for one minute per MIL-STD 202, Method 301) 2500 V
Insulation Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000 MΩ
File Number 2190.3