I bought a dtc144 transistor because it was written in its datasheet that it could do a "Switching circuit" ( as it is written in the Applications section in the datasheet). I though it meant that I could turn on/off a sub-circuit in my PCB design, but when I tested, it didn't worked as I imagined.
Did I misunderstand what switching circuit means? How can I use this transistor to turn on/off a sub circuit?
The datasheet (first page) has the following image:
(if you can not see the image, check the datasheet. I am having problems to upload the image)
I thought that as a transistor, if I put a GND in the "in" pin, the transistor would behave as high impedance between the "out" and the "gnd" pins, and low inpedance if I put VCC instead of GND in the "in" pin. But it seems that I am wrong.
I'd appreciate if you could help me understand. Thanks.