High Voltage Diodes target power applications.
Press Release Summary:
Suited for voltages between 800-1,200 V and small currents from 1-3 A, Series STTH features planar, platinum-doped silicon, which optimizes combination of voltage drop and leakage current recovery time. With max operating temperature of 175°C, devices are suitable for free-wheeling, clamping, snubbing, and demagnetization functions in power supplies and other power-switching applications.
Original Press Release:
STMicroelectronics Introduces High-voltage, Low-current Diodes for Power Applications
Platinum doping helps improve performance trade-offs
GENEVA, Nov. 19 - STMicroelectronics (NYSE:STM) has introduced a range of ultra-fast high-voltage, medium-current diodes.
The STTH diodes are designed for use in industrial, automotive, motor control, lighting and power conversion applications, which need high-voltage ultra-fast diodes that will handle voltages between 800 and 1200V, but relatively small currents from 1 to 3A. Such applications also need diodes with medium recovery times (of not more than 75ns) and the best possible ratio of forward voltage drop (V[F]) to leakage current (I[R]).
The STTH parts are built with a planar, platinum-doped silicon, which helps optimize the combination of V[F], I[R] and t[rr] recovery time. There is a trade-off in both former gold- and new platinum-doped diodes between forward voltage drop V[F] and reverse recovery time t[rr]. The advantage of the platinum doping process is to reduce leakage current by approximately 100 times, compared to gold doping, providing scope to improve V[F] at a given t[rr].
The platinum process enables STMicroelectronics to offer a maximum operating temperature of 175 degrees Celsius for its diodes. The reduced leakage current of the process also creates a useful temperature margin with regard to the thermal runaway phenomenon. On top of this, the optimization of the forward voltage drop in the new series cuts the power losses of the clamping functions in standby mode.
Key characteristics of the available parts are laid out in this table, in which V[RRM] is the peak repetitive reverse voltage and I(F)[AV] is the average forward current:
Part number VRRM I(F)[AV] Packages
STTH108 800 1 DO-41, SMA
STTH110 1000 1 DO-41, SMA
STTH112 1200 1 DO-41, SMA, SMB
STTH208 800 2 DO-15, SMB
STTH310 1000 3 DO201-AD, SMC
These parts are especially suitable for free-wheeling, clamping, snubbing and demagnetisation functions in power supplies and other power-switching applications.
Prices range from US$0.17 to US$0.24 in quantities of 5K pieces.
About STMicroelectronics
STMicroelectronics is a global leader in developing and delivering semiconductor solutions across the spectrum of microelectronics applications. An unrivalled combination of silicon and system expertise, manufacturing strength, Intellectual Property (IP) portfolio and strategic partners positions the Company at the forefront of System-on-Chip (SoC) technology and its products play a key role in enabling today's convergence markets. The Company's shares are traded on the New York Stock Exchange, on Euronext Paris and on the Milan Stock Exchange. In 2003, the Company's net revenues were $7.24 billion and net earnings were $253 million. Further information on ST can be found at www.st.com/.
