Welcome, @esisw.1, to the community!
The pnp bipolar transistor BD140 will be supplied in three groups of the parameter hfe (see datasheet, page 4):
- BD140: 40...250
- BD140-10: 63...160
- BD140-16: 100...250
Of course, it always depends on the circuit, but most of the time you can replace a BD140 with a BD140-10 or BD140-16, but not necessarily vice versa.
If you want to be sure that the circuit works safely with the BD140 instead of the BD140-10 or BD140-16, you have to measure the value of hfe of the BD140 and make sure that you are in the appropriate group with it.
Does it answer your question?
Regards
/Peter
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