If you need a bipolar NPN transistor with dynamic characteristics and lot to lot minimum spread for your light ballast
applications, you may consider the BUD42D 4A, 650V, 25W Power
Transistor. The schematic below is the typical inductive load switching
drive circuit diagram of the BUD42D.
device has features such free wheeling diode built in, flat DC current
gain, antisaturation network, transient voltage suppression capability,
and “6 Sigma” Process Providing Tight and Reproducible Parameter Spreads.
Find another sections of The BUD42D Bipolar NPN Transistor Datasheet and Inductive Load Switching Circuit Diagram such as the marking diagrams, typical switching characteristics, and typical solder heating profile in this BUD42D Datasheet (source: onsemi.com).