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Relais-Schutzdiode verzichtbar?
ehemals Ferranti E-LINE Transistorapplications THE USE OF THE BASE EMITTER JUNCTION OF THE ZTX300 AS A ZENER DIODE ... The typical breakdown voltage is 8 volts and the devices exhibit a hard characteristic. Slope impedance at 20mA is typically 20 Ohm and maximum dissipation is 200mW.
transistors had typical breakdown voltages in the 6-7 5V region with similar slope resistance to the ZTX300 (BCW10). Degradation of D.C. Current Gain during Breakdown of Emitter Base Junction. The emitter base junction of an E-line transistor may be used satisfactorily as a zener diode as