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                                                                                            BUL742C
                                                                                           BULB742C
                                                                 High voltage fast-switching
                                                                      NPN power transistor

Features
   Low spread of dynamic parameters
   High voltage capability
   Minimum lot-to-lot spread for reliable operation
   Very high switching speed
                                                                                       3                       3
                                                                                                            12
                                                                                   2
                                                                               1
Applications
                                                                      TO-220                        I2PAK
   Electronic ballast for fluorescent lighting
   Switch mode power supplies

Description
The device is manufactured using high voltage             Figure 1.     Internal schematic diagram
multi-epitaxial planar technology for high
switching speeds and high voltage capability.
Thanks to an increased intermediate layer, it has
an intrinsic ruggedness which enables the
transistor to withstand an high collector current
level during breakdown condition, without using
the transil protection usually necessary in typical
converters for lamp ballast.




Table 1.     Device summary
   Order code            Marking                      Package                              Packaging

    BUL742C             BUL742C                        TO-220
                                                                                             Tube
   BULB742C-1          BULB742C                        I2PAK




May 2008                                              Rev 3                                                   1/12
                                                                                                        www.st.com   12
Contents                                                                                     BUL742C - BULB742C


Contents

1          Electrical ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2          Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
           2.1      Electrical characteristics (curves) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3          Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4          Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5          Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11




2/12
BUL742C - BULB742C                                                             Electrical ratings


1        Electrical ratings

         Table 2.      Absolute maximum rating
          Symbol                             Parameter                       Value         Unit

           VCES      Collector-emitter voltage (VBE = 0)                     1050           V
           VCEO      Collector-emitter voltage (IB = 0)                       400           V
           VEBO      Emitter-base voltage (IC = 0, IB = 2 A, tp < 10 ms)   V(BR)EBO         V
            IC       Collector current                                         4            A
            ICM      Collector peak current (tP < 5ms)                         8            A
             IB      Base current                                              2            A
            IBM      Base peak current (tP < 5ms)                              4            A
            Ptot     Total dissipation at Tc = 25



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