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STMicroelectronics reveals enhanced automotive surge protection devices

Posted: 20 Jul 2012 ?? ?Print Version ?Bookmark and Share

Keywords:automotive surge protection devices? transient voltage suppressors? automotive industry?

Miniature Transil protection devices, characterized and certified to auto industry's preferred ISO pulse specifications, cut approval time and costs for sensitive vehicle electronics

STMicroelectronics now markets surge protection devices it claims are certified to the automotive industry's preferred specifications. These transient voltage suppressors (TVS) enable new products to reach the market more quickly and at more competitive prices by saving the time needed for independent certification.

Surge protection prevents unwanted voltage pulses in the vehicle wiring from damaging sensitive subsystems such as safety systems, control modules and infotainment equipment. Pulses can be caused by events such as electrostatic discharges (ESD) from occupants, turn-on/off of subsystems such as motor drives or climate control, or load dumps when a significant load such as the battery is suddenly disconnected.

Historically, designers have chosen from devices certified to industrial standards that specify pulse shapes unrepresentative of those expected in road vehicles.

ST's SM4TY-SM30TY series of Transil miniature surge-protection devices are certified to pulse specifications used by the automotive industry. They are also qualified to the AEC-Q101 automotive reliability test standard for discrete semiconductors, and have a full Automotive-Grade Approval Certificate (AGAC). This saves designers time researching for equivalence between industrial and automotive standards, and then re-certifying each new subsystem design independently.

Transil protection devices are housed in miniature surface-mount power packages occupying from 12.8mm2 to 46mm2 of pc board space, capable of handling from 400W to 3000W of power contained in pulses and ESD transients present on the vehicle wiring.

Among the major features of ST's automotive Transil protection devices are their being tested and certified using ISO 7637 specifications for electrical transients; tested and certified using ISO 10605 specifications for ESD strike and AEC-Q101. All devices are available in unidirectional or bidirectional configuration

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