silicon planar npn transistor.
at collector currents up to 500 mA, and feature useful current gain over a wide range of collector current, low leakage .
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. They are designed for high-speed switching applications at collector cur.
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