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                                                                                               STD878
                                                                                               STN878
                                       High current, high performance, low voltage
                                                                  NPN transistors

Features
    Very low collector to emitter saturation voltage
    DC current gain, hFE >100                                    4                         4
    5 A continuous collector current
                                                                                    3
                                                                                2                           3
Applications                                                               1                            1

    Power management in portable equipment
    Voltage regulation in bias supply circuits                        SOT-223                  DPAK
    Switching regulator in battery charger
    applications
    Heavy load driver
                                                          Figure 1.     Internal schematic diagram
Description
The devices are manufactured in low voltage NPN
planar technology with "base island" layout. the
resulting transistor shows exceptional high gain
performance coupled with very low saturation
voltage.




Table 1.      Device summary
   Order codes          Markings                   Packages                              Packaging

   STD878T4              D878                           DPAK                            Tape and reel
     STN878              N878                          SOT-223                          Tape and reel




August 2010                                  Doc ID 13836 Rev 2                                                 1/10
                                                                                                        www.st.com     10
Electrical ratings                                                                          STD878, STN878


1           Electrical ratings

            Table 2.        Absolute maximum ratings
             Symbol                              Parameter                                Value      Unit

                 VCBO    Collector-base voltage (IE = 0)                                   45         V
                 VCEO    Collector-emitter voltage (IB = 0)                                30         V
                 VEBO    Emitter-base voltage (IC = 0)                                      6         V
                  IC     Collector current                                                  5         A
                 ICM     Collector peak current (tP < 5 ms)                                10         A
                         Total dissipation at TC = 25 

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