MALVERN, PA. Vishay Siliconix is sampling what it says is the industry's first commercially available power MOSFET with an on-chip temperature-sensing diode.
The SUB60N04-15LT gives designers of automotive electronics a simple means of protecting power circuitry from current overloads and excessive temperatures. Unlike temperature-sensing solid-state switches, the device uses a standard power MOSFET technology with standard MOSFET terminals, providing designers with a simpler upgrade path than devices using an IC process.
The 40-volt device comes in a five-pin D2PAK. It combines a 15-milliohm power MOSFET with back-to-back polysilicon diodes integrated onto the MOSFET chip. Intended for motor control, solenoid driver and relay-replacement applications, the SUB60N04-15LT additionally provides a 175 degrees C maximum junction temperature and a 2,000-V electrostatic-discharge rating, ensuring reliability in the harsh automotive environment.
"The SUB60N04-15LT offers a lot of extra protection for very little additional cost," said Tony Grizelj, market development manager. "It will allow automotive designers to significantly improve the reliability of their systems while reducing the incidence of warranty repairs."
The device's noncommitted diode features a tight tolerance on forward voltage that can be used to provide a shutdown signal. The diode forward voltage falls to about 0.4 V with a bias current of 250 microamps when the MOSFET is close to the maximum permitted temperature value. Simple associated circuitry can be incorporated into an existing analog ASIC at negligible added cost. An external comparator used to detect overtemperature can also be used as a driver stage for the MOSFET, meaning that the on/off input is logic compatible, and can be driven from a logic gate.
Production quantities of the SUB60N04-15LT are available now, with lead times of eight to 10 weeks for large orders. Pricing is 93 cents each in 100,000-piece quantities for U.S. delivery. Data sheets are available at http://www.siliconix.com/www/data/pwros/70942.pdf.
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EETInfo No. 615