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has announced an
innovation that will help to reduce the size and cost of surge
protectors for electronic equipment. It provides specified energy
absorption capability up to the maximum operating temperature.
Surge protection is mandatory for most
electronic equipment, to prevent power supply fluctuations or
electrostatic discharges from damaging sensitive circuitry. A diode
array, or Transil, is commonly used to divert the surge energy to
ground, away from the circuitry. Hundreds of millions of these
devices are used every year, in new products of all types — from
handhelds to high-power equipment. A Transil's energy absorption
capability is usually specified at 25°C, reducing to zero at its
maximum temperature. Designers often use larger devices to ensure
protection over the equipment's operating range.
ST's new SMxJ and SMxT series
Transils are the first to remedy this by maintaining high surge
protection all the way to the device's maximum junction
temperature. This allows engineers to use a smaller, lower-cost
device with the assurance that adequate protection will be provided.
There are six different series in the range, with specified surge
energy from 100W to 1500W (10/1000-microsecond pulse) thereby
covering a broad spectrum of applications.
Additional benefits of the SM series
include an 80 percent reduction in leakage, which reduces system
power consumption and improves energy efficiency. ST also specifies
dynamic resistance for its new devices, which allows the clamping
voltage to be calculated accurately so as to improve protection and
minimize risk of equipment failure.
Major features of SM series:
· High surge capability at
maximum junction temperature
· ESD protection meeting IEC
61000-4-2 and MIL-STD-883G
· Specified with 8/20µs
surge
to meet IEC 61000-4-5 for electrical over-stress
· Leakage current specified at
85°C, meeting telecommunication industry requirements
· Operating temperature range:
-40°C to 150°C enabling use in consumer, telecom and industrial
applications