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The 2N4124 is a general-purpose NPN small-signal transistor in a plastic TO-92 package. It works as a medium-gain voltage amplifier or a low-power saturated switch, and it is the higher-gain part in the 2N4123/2N4124/2N4125 family. It suits hobbyists, repairers and students who need a cheap, widely stocked part for audio preamp stages, signal switching and driving small loads. Compared with the BC547 it has a similar pinout and role but lower current and power ratings, so it fits small-signal work rather than power switching.
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Lowest price we've seen: $1.42 on Nov 11 at Electrical.com. Tracked across 3 stores since Nov 11.
Owners and hobbyists treat the 2N4124 as a dependable general-purpose NPN for small-signal work. Most complaints concern its modest ratings and the need to check pinout against substitutes rather than the part itself.
The 2N4124 is a general-purpose NPN silicon small-signal bipolar junction transistor (BJT). It comes in a plastic TO-92 package.
It is designed as an economy, medium-gain voltage amplifier or a low-power saturated switch. Typical uses include vintage tabletop AM/FM clock radios, handheld electronic toy logic nodes, and consumer device status indicators.