Note that in your specific case, the code you're looking for is probably just "331". If the manufacturer no longer exists, or has gotten bought up by another company decades ago, you're probably just out of luck. If they don't, you'd have to contact the manufacturer and ask. RegisterorSign In Please enter a full or partial manufacturer part number with a minimum of 3 letters or numbers Part SearchParametric SearchPart Details 2N2222 price and stock Part Details2N222. 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. 2N2222 price and availability by authorized and independent electronic component distributors. There is no standard, so without knowing the manufacturer, you're out of luck. Nieuwe MMBT2222A Gedrukt 1P Transistor Smd SOT23 0.6A/40 V 2N2222,Koop van verkopers in China en van rond de hele wereld. 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. The usual practice is to put some manufacturer-specific code that identifies which lot the device came from.
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