You can download the datasheet of 2N2222 from the link given below:ĢN2222 FAQ What are 2N2222 High-Speed Switches ?ĢN2222 is a silicon planar epitaxial NPN transistor in Jedec TO-18 metal cases.
* Pulsed : pulse duration = 300 µs, duty cycle = 1 %. (T amb = 25 ☌ unless otherwise specified) SymbolĬolllector-base Breakdown Voltage (I E = 0)Ĭollector-emitter Breakdown Voltage (IB = 0)Įmittter-base Breakdown Voltage (I C = 0) They are designed for high-speed switching applications at collector currents up to 500 mA, and feature useful current gain over a wide range of collector current, low leakage currents and low saturation voltages.ĢN2218/2N2219 approved to CECC 50002-100, 2N2221/2N2222 approved to CECC 50002-101 available on request. The A probably means it's a 2N2222A.The 2N2218, 2N2219, 2N2221 and 2N2222 are silicon planar epitaxial NPN transistors in Jedec TO-39 (for 2N2218 and 2N2219) and in Jedec TO-18 (for 2N2221 and 2N2222) metal cases. 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. 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. The usual practice is to put some manufacturer-specific code that identifies which lot the device came from.
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