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Power Bipolar Transistors
For Electronic Transformers

Following the increasing demand for devices dedicated to lighting applications, ST has introduced three bipolar transistors designed specifically for electronic transformers:

BUL39D Product Page
BUL49D Product Page
BUL59 Product Page

BUL39D/BUL49D photo

 

Features
The main requirement of a transistor operating in lighting applications is the ability to withstand the high current flowing through the device during start up and short circuits. The increased ruggedness of these new devices improves the safety margins when the transistor operates in such conditions. The new devices are also able to guarantee a Reverse Biased Safe Operating Area with a Vcew capability up to 450V at high current level.

BUL39D and BUL49D
The collector-emitter saturation voltage has been reduced in the three new devices, and the diode forward voltage in the two devices with the built-in free-wheeling diode. This helps to minimize the transistors losses in the application, while the controlled switching time spread guarantees a stable and symmetrical operation of a pair of power switches present in the typical electronic transformer circuit.
 
Device Vceo
(V)		 Vces/Vcev
(V)		 Ic
(A)		 Ptot
(W)		 Package Typical
Application
BUL39D 450 850 4 70 TO-220 up to 50W
BUL38D 450 800 5 80 TO-220 up to 75W
BUL49D 450 850 5 80 TO-220 up to 75W
BUL59 400 850 8 90 TO-220 upto 105W
BUL58D 450 800 8 85 TO-220 up to 105W
BUL510 450 1000 10 100 TO-220 up to 150W
BUL89 400 850 12 110 TO-220 up to 250W
BUL810 400 1000 15 125 TO-218 up to 300W

ST has one of the most complete families dedicated to electronic transformers
 

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