View 2n2219a 2n2222a datasheet:

2N2219A 2N2222A ® HIGH SPEED SWITCHES PRELIMINARY DATA DESCRIPTION The 2N2219A and 2N2222A are silicon Planar Epitaxial NPN transistors in Jedec TO-39 (for 2N2219A) and in Jedec TO-18 (for 2N2222A) metal case. They are designed for high speed switching application at collector current up to 500mA, and feature useful current gain over a wide range of collector current, low leakage currents and low saturation voltage. TO-18 TO-39 INTERNAL SCHEMATIC DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit V Collector-Base Voltage (I = 0) 75 V CBO E V Collector-Emitter Voltage (I = 0) 40 V CEO B VEBO Emitter-Base Voltage (IC = 0) 6 V IC Collector Current 0.6 A ICM Collector Peak Current (tp < 5 ms) 0.8 A Ptot Total Dissipation at Tamb ? 25 oC 0.8 W for 2N2219A