ELECTRONICS: STMicroelectronics announced silicon surge protectors that meet international surge-protection standard IEC61000-4-5, with a family of devices delivering high reliability and effective protection throughout the entire operating-temperature range.
The STIEC45 Transil™ family provides mandatory protection for power supplies against surges, electrostatic discharge, and electrical fast transients. Metal-Oxide Varistors (MOVs) are usually connected to prevent surge energy reaching the power supply, but silicon surge protectors are more reliable. Among these, only the STIEC45 family is specified according to IEC61000-4-5.
In addition, ST’s Transils maintain more than 75 percent of their protection capability up to 150C, and are soldered to standard-sized metal pads on the pc-board. This approach delivers a space-efficient solution for equipment operating in high-temperature environments, such as factories or vehicles. Alternative silicon devices sometimes require oversized pads to provide the stated surge protection, and the level of protection can decrease rapidly beyond 25C. At 125C, some absorb less than 40 percent of the peak pulse-power specified.
STIEC45-xxAS family highlights include:
The devices also meet: IEC61000-4-2 for ESD and IEC61000-4-4 for Electrical Fast Transient (EFT)
Pass MIL-STD-883 (Method 3015) ESD tests
500A (8/20µs) peak pulse-current capability
410A (8/20µs) current capability at 150C
Low leakage current: 0.2µA at 25C; 1µA at 85C
Stand-off voltage options: 24V, 26V, 28V, 30V, 33V
Five STIEC45 variants are available, covering stand-off voltages from 24V to 33V. The family is in mass production, in 8 x 6mm SMC surface-mount packages, priced from $0.20 in quantities of 100,000 units.
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