STMicroelectronics Shrinks Space Requirement for Mandatory Surge Protection

Next-generation Transil™ family absorbs high surge energy over full temperature range to save designers over specifying

GENEVA, July 12 — (PRNewswire) — STMicroelectronics (NYSE: STM), a world leader in protection ICs, has announced an innovation that will help reduce the size and cost of surge protectors for electronic equipment by providing specified energy absorption capability up to the maximum operating temperature. Competing devices must be derated significantly at temperatures above 25 degrees C.

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 degrees 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% reduction in leakage current compared to previous generations, 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 8/20-microsecond surge to meet IEC 61000-4-5 for electrical over-stress
  • Leakage current specified at 85 degrees C, meeting telecommunication industry requirements
  • Operating temperature range: -40 degrees C to 150 degrees C enabling use in consumer, telecom and industrial applications
  • Devices available:

Series

Standoff voltage

Peak pulse energy (10/1000-microsecond)

Pulse energy at Tjmax

Leakage current @25 degrees C

Package

SMX1J

7.5V

85W

78W

1.0uA

uQFN 2L (1.45 x 1.00mm)

SMCJ

5 - 188V

1500W

1250W

0.2uA

SMC (7.15 x 6.25mm)

SMBJ

5 - 188V

600W

515W

0.2uA

SMB (4.60 x 3.95mm)

SMAJ

5 - 188V

400W

270W

0.2uA

SMA (5.35 x 2.90mm)

SM15T

6.8 - 220V

1500W

1250W

0.2uA

SMC (7.15 x 6.25mm)

SM6T

6.8 - 220V

600W

515W

0.2uA

SMB (4.60 x 3.95mm)




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