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                                                                                           BUL741
                                                                                         BUL741FP

                             High voltage fast-switching NPN power transistors

Features
   High voltage capability
   Low spread of dynamic parameters
   Minimum lot-to-lot spread for reliable operation
   Very high switching speed
                                                                                     3                       3
                                                                                 2                       2
                                                                                                     1
Applications                                                                 1


   Electronic ballast for fluorescent lighting                      TO-220                TO-220FP

   Switch mode power supplies.

Description
                                                        Figure 1.     Internal schematic diagram
The devices are manufactured using high voltage
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 codes               Marking                    Packages                         Packaging

      BUL741                  BUL741                     TO-220                            Tube
    BUL741FP                 BUL741FP                   TO-220FP                           Tube




August 2009                                  Doc ID 13406 Rev 3                                                  1/12
                                                                                                     www.st.com         12
Contents                                                                                                BUL741, BUL741FP


Contents

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

2          Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
           2.1      Typical characteristic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
           2.2      Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3          Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4          Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11




2/12                                              Doc ID 13406 Rev 3
BUL741, BUL741FP                                                                      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 < 10ms)            V(BR)EBO         V
            IC      Collector current                                                2.5           A
            ICM     Collector peak current (tP < 5 ms)                                5            A
             IB     Base current                                                     1.5           A
            IBM     Base peak current (tP < 5ms)                                      3            A
                    Total dissipation at Tc = 25 



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