![]() In this case, as it has a TO-39 format (up to 3w) and supports up to 300 Mhz, it can be used in transmitters and amplifiers for HF and VHF and even some UHF cases with output powers of 1 to 2 watts. Also the 2N2219 is similar, but for more power. If the circuit is only for small signals, it could be perfectly replaced. You could also use the 2N3904 with very similar characteristics, but it can only carry one tenth of the current supported by the 2N2222. ![]() Equivalent: you can use the BC548 we saw in the previous post, but remember to turn it 180ยบ when inverting the collector and emitter pins.Packages: TO-92 plastic, TO-18 metal, SOT-23 and SOT-223, these last two are SMD type.Working frequency: 250-300 Mhz, which allows its application in high frequency radio.Current gain: >100hFE, typically 150 is reached.Emitter collector voltage at cut-off: 50V. ![]() ![]() If we look at the datasheets provided by these manufacturers, the characteristics that we will find in this transistor are The 2N2222A is TO-18 metal encapsulated and qualified for use in military applications (MIL-STD) for its ruggedness, acceptable temperature range, etc. ![]()
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