2SD1843

      The 2SD1843 is a Darlington connection transistor with on-chip dumper diode in collector to emitter and zener diode in collector to base. This transistor is ideal for use in acuator drives such as motors, relays, and solenoids.
Here you can get some information about the features.2SD1843 has high DC current gain due to Darlington connection.
Besides,it has a high surge resistance due to on-chip protection elements: C to E: Dumper diode;C to B: Zener diode.What,s more, it has a low collector saturation voltage.
      You have to get some detail information about the absolute maximum ratings if you want to purchase 2SD1843.The Storage Temperature (T_stg) is from -55~+150 .The Junction Temperature (T_j) is +150 .The Collector to Base Voltage (V_CBO) is 60±10 V.The Collector to Emitter Voltage (V_CEO) is 60±10 V.The Emitter to Base Voltage (V_EBO) is 7 V.The Collector Current DC (I_C) is ±1.0 A.The Collector Current Pulse (I_C(pulse)) is ±2.0 A under the condition that PW 10 ms, duty cycle 50%.The Total Power Dissipation (P_T) is 1.0 W at T_c = 25.
      The following is the electrical characteristics of 2SD1843 at Tc=25.First is about the Collector Cutoff Current.The Max. I_CBO is 0.5 A at V_CB = 40 V,I_E = 0.The Max. Emitter Cutoff Current (I_EBO) is 1.0 mA at V_EB = 5.0V,I_C = 0.The Min. DC Current Gain (h_FE2) is 1000 on the condition that V_CE = 2.0 V, I_C = 0.2 A, PW 350 s and duty cycle 2%.The Min. DC Current Gain (h_FE2) is 2000 and the max. is 30000 on the condition that V_CE = 2.0 V, I_C = 0.5 A,PW 350 s and duty cycle 2%.The Max. Collector to Emitter Saturation Voltage (V_CE(sat)) is 1.5 V and the Max. Base to Emitter Saturation Voltage (V_BE(sat)) is 2.0 V under the condition that I_C = 0.5A,I_B = 0.5 mA.Under the condition that I_C = 0.5 A,I_B1 = -I_B2 =0.1mA and V_cc = 50 V, the Max Turn on Time (t_on) is 0.5 s,the Max. Storage Time (t_s) is 1.0 s and the Max. Fall Time (t_f) is 1.0 s.