BC556 is a common and general purpose bipolar junction transistor available in TO-92 package. Due to its general purpose features it can be used in variety of general switching and amplification applications in electronic circuits. The collector-emitter voltage of the transistor is -65V therefore it can be used to drive loads upto -65V DC with max 100mA current. With 500mW collector dissipation (Pc) value and 110 to 800 DC current gain value this transistor can also be used in variety of general signal amplification and audio preamplification purposes. The transistor is manufactured in three different part numbers like BC556A, BC556B and BC556C and the only difference between these three different part numbers is the HFE values. If the ending alphabet is A then the HFE value will be 110~220, if the ending alphabet is B then the HFE value will be 200~450 and if its C then 420~800.

Features

• Package Type: TO-92
• Transistor Type: PNP
• Max Collector Current(I_C): -100mA
• Max Collector-Emitter Voltage (V_CE): -65V
• Max Collector-Base Voltage (V_CB): -80V
• Max Emitter-Base Voltage (VBE): -5V
• Max Collector Dissipation (Pc): 500 Milliwatt
• Max Transition Frequency (fT): 100 MHz
• Minimum & Maximum DC Current Gain (h_FE): 110 to 800
• Max Storage & Operating temperature Should be: -65 to +150Centigrade

Datasheet: https://www.onsemi.com/pdf/datasheet/bc556b-d.pdf