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TO-220FH: The new Power Bipolar Transistor
Package for High Voltage Applications

After receiving many requests from the market, especially from Japanese TV manufacturers, such as Sharp, Toshiba and Sony, the new TO-220FH (Fully plastic High voltage) innovative package has recently been added to the already broad power Bipolar transistor package portfolio. This package is an upgrade of the popular TO-220FP package. The creepage path is what makes this package unique from TO-220FP.
Humidity and foreign material covering the package could affect the superficial resistivity between leads and between the leads and the heatsink; however, by increasing the creepage distance any possible superficial leakage increase is cut. The creepage distance path between each lead and between the leads and the heatsink has been increased to >4.0mm, making this package met all stringent safety norms in high voltage applications. As well as the advantages that the increase of the creepage path gives us, this package also offers a competitive low price solution for the TV market. This package has been tailored to contribute in making ST a leading supplier in horizontal deflection transistors for low-end TVs. All devices found in this package can easily be recognized by the “FH” suffix in the sales type.
Samples are now available and datasheets can be found on the ST web.
 

Features
Fully plastic TO-220 package;
Creepage distance path is >4mm;
Lead forming option;

Creepage Distance Comparisons
Package Creepage (mm) Creepage back (mm)
TO-220FH ~4.0 ~4.0
TO-220FP ~1.5 ~2.6

Benefits
Easy mounting with heatsink;
Competitive low price solution for TVs;
Meets the most rigid safety norms in high voltage applications;
BU808D Darlington solution competitiveness even further improved;

Main Applications
Low-End TVs up to 21”;
High Voltage applications.