identifying transistors

hello all,
i have a lot of transistors that are mixed up. how can i ID them? example: on the front markings are
and on the back is the letter Q
what transistor is this?

schumi235 years ago
To identify transistors, and other electric components, you can often just put in what is marked on them (at least 5 characters generally) in Google, and it will spit out the datasheet. Here i put BC7-25 into Google, and it told me that it is a pnp transistor (try it!)