High Voltage, Low Current Diodes suit power applications.

Press Release Summary:

STTH108/110/112/208/310 diodes are built with planar, platinum-doped silicon, which results in max operating temperature of 175°C. Series handles voltages from 800-1,200 V and currents from 1-3 A in industrial, automotive, motor control, lighting, and power conversion applications. With recovery times under 75 ns, products are specifically suited for free-wheeling, clamping, snubbing, and demagnetisation functions in power-switching applications.

Original Press Release:

STMicroelectronics Introduces High-Voltage, Low-Current Diodes for Power Applications

Platinum doping helps improve performance trade-offs

Geneva, November 19, 2004 - 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 (VF) to leakage current (IR).

The STTH parts are built with a planar, platinum-doped silicon, which helps optimize the combination of VF, IR and trr recovery time. There is a trade-off in both former gold- and new platinum-doped diodes between forward voltage drop VF and reverse recovery time trr. The advantage of the platinum doping process is to reduce leakage current by approximately 100 times, compared to gold doping, providing scope to improve VF at a given trr.

The platinum process enables STMicroelectronics to offer a maximum operating temperature of 175°C 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 VRRM is the peak repetitive reverse voltage and IF(AV) is the average forward current:
Part number VRRM IF(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.

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