![]() ![]() ![]() You can now buy 2N2222 in the TO-92 package on the site. As you can see the 2N3904 collector current is 200mA while the 2N2222 collector current is 600mA. But when we look at the collector current there is much difference between the two. 2N3906 PNP Transistor 40 V 0.2A 625mW (Silicon Epitaxial Planar / General Purpose BJT-PNP) 3-Pin Common Base TO-92 Package suitable for Through-Hole PCB. It has a Vce of 40V, Ic of 200 mA, and power. The author was the global business manager of the Discrete division of National Semiconductor in Silicon Valley in the late ’80s. The total device dissipation of both the transistors is also the same which is 625mW and the (fT) or transition frequency is also the same which is 300MHZ. The 2N3906 is a commonly used general purpose discrete small-signal PNP transistor in a plastic TO-92 case. Some vendors simply supply a 2N2222 (TO-92 package) and marked as 2N2222 instead of PN2222. 2N3904 has Ic rated limit of 200mA but theoretically, 2N3904 should be able to handle at least 600mA Ic.Īs the demand for 2N2222 (TO-18) has dropped significantly or the suppliers don’t want to make it anymore. PN2222 was then introduced with the TO-92 package to replace 2N2222 and with the specification of 600-800mA depending on vendors.Īs said before, the current handling is highly depending on the package itself. TO-18 package loses its competitiveness and popularity. TO-92 package has Pd of 1.5 W at 25 deg.C (Tc)ĢN2222 was designed to handling higher current up to 1000mA, but the manufacturing cost of the TO-18 package is much higher than the TO-92 plastic package.TO-18 package has Pd of 1.8 W at 25 deg.C (Tc).Power Dissipation, Pd = V x I = Vce(sat) x Ic The fundamental difference is the power handling or current (Ic) handling due to different package used. □ “EEVBlog” linkĢN2222 is in the TO-18 metal package and 2N3904 is in the TO-92 plastic package. I am thinking why is the 2N3904 so popular, why not just use 2N2222 all the time or even maybe a max=5A all the time? I know that the price can differ but it’s about a few cents and to home use, it does not kill the budget. You also use transistors that are next to each other on the reel. Suppose you build a differential pair from mmbt3904 (2N3904 surface mount equivalent) transistors with mmbt3906 (2N3906 surface mount equivalent) for a current mirror. Just a short and hopefully simple question. Typical Transistor Mismatch for 2N3904/2N3906. A 2N2222 can handle up to 5 times that amount since it can handle up to 1A (ampere) of current flow from the emitter to the collector to power on a load. Here are some popular comments from blogs.Ī 2N3904 can handle up to 200mA (milliamperes) of current flow from the emitter to the collector terminal. Whenever you search for 2N3904, Google will suggest that 2N3904 vs 2N2222 as a popular search. ![]()
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