![]() ![]() ![]() Note that in your specific case, the code you're looking for is probably just "331". 2N2222A Small Signal Switching Transistor NPN Silicon Features MILPRF19500/255 Qualified Available as JAN, JANTX, and JANTXV MAXIMUM RATINGS (TA 25C unless otherwise noted) THERMAL CHARACTERISTICS Stresses exceeding those listed in the Maximum Ratings table may damage thedevice. If the manufacturer no longer exists, or has gotten bought up by another company decades ago, you're probably just out of luck. Bipolar (BJT) Transistor NPN 30 V 600 mA. If they don't, you'd have to contact the manufacturer and ask. Download schematic symbols, PCB footprints, 3D Models, pinout & datasheet for the 2N2222 by STMicroelectronics. Even if you do know the manufacturer, these codes are meant mostly for the manufacturer's internal reference, so they might not be explained on the datasheet. ![]() There is no standard, so without knowing the manufacturer, you're out of luck. But fitting that along with the part number on a TO-92 or TO-18, let alone a SOT-23 or SC-70, is pretty tough, so other codes are used instead. On parts with more room than a TO-92 or TO-18 provides, you might get a one-digit factory code for which factory the part was made in, combined with a four-digit date code consisting of the last two digits of the year and two digits indicating which week of the year it was made in. ![]() You possibly find it in a museum or an antique shop. The usual practice is to put some manufacturer-specific code that identifies which lot the device came from. 2N222 is an ancient germanium small signal transistor. Amplifier Transistors NPN Silicon Features These are PbFree Devices MAXIMUM RATINGS (TA 25☌ unless otherwise noted) Characteristic Symbol Value Unit CollectorEmitter Voltage VCEO 40 Vdc CollectorBase Voltage VCBO 75 Vdc EmitterBase Voltage VEBO 6. ![]()
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