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 The 3CA1837 is a kind of TO-220 plastic-encapsulate transistor (NPN).Here you can get some information about the features.First,it has high transition frequency : fT=70MHZ(Typ).Secondly,it is complementary to 3DA4793.Thirdly,the collector power dissipation (P_CM) is 2W (Tamb=25℃) and 20 W (T_case=25℃).

      You have to get some detail information about the absolute maximum ratings if you want to purchase the product.The Storage Temperature (T_stg) is from -55 to +150 ℃.The Junction Temperature (T_j) is +150 ℃.The Collector to Base Voltage (V_CBO) is -230 V.The Collector to Emitter Voltage (V_CEO) is -230 V.The Emitter to Base Voltage (V_EBO) is -5 V.The Collector Current DC (I_C) is -1000 A.The Base Current DC (I_B) is -100 A.
      The following is about the electrical characteristics at T_C=25℃.The Min Collector-base Breakdown Voltage (V_(BR)CBO) is -230 V at I_C=-100μA,I_E=0.The Min Collector-emitter Breakdown Voltage (V_(BR)CEO) is -230 V at I_C=-1mA,I_B=0. The Min Emitter-base breakdown voltage (V_(BR)EBO) is -5 V at I_E=-100μA, I_C=0.The Max Collector Cut-off Current (I_CBO) is -10 μA at V_CB = -230 V,I_E=0.The Max. Emitter Cut-off Current I_EBO is -10 μA at V_EB=-5V, I_C=0. The Min. DC Current Gain (h_FE) is 100 and the Max. is 320 at V_CE = -5 V, I_C = 100 mA. The Max. Collector to Emitter Saturation Voltage (V_CE(sat)) is -1.5 V at I_C = -500mA,I_B = -50mA. The Typical Transition Frequency (f_T) is 30 MHz at V_CE = -10V, I_C = -100mA.

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