The 2N4401 transistor is very much similar to the commonly used NPN transistor 2N2222. When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region and the Base Emitter voltage could be around 660 mV. This stage is called Saturation Region and the typical voltage allowed across the Collector-Emitter (V CE) or Base-Emitter (V BE) could be 200 and 900 mV respectively. When this transistor is fully biased then it can allow a maximum of 800mA to flow across the collector and emitter. To bias a transistor we have to supply current to base pin, this current (I B) should be limited to 5mA. The maximum amount of current that could flow through the Collector pin is 800mA, hence we cannot connect loads that consume more than 500mA using this transistor. 2N4401 has a gain value h fe of 500 this value determines the amplification capacity of the transistor. Note: Complete technical details can be found in the 2N4401 datasheet attached at the bottom of the page.īC549, BC636, BC639, BC547, 2N2369, 2N3055, 2N3904, 2N3906, 2SC5200, 2N5551ĢN4401 is a NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at ground and will be closed (Forward biased) when a signal is provided to base pin. Emitter Base Breakdown Voltage (V BE) is 6V.Collector-Emitter voltage (V CE) is 40 V.Continuous Collector current (I C) is 500mA.High DC Current Gain (h FE), typically 80 when I C=10mA. Current Drains out through emitter, normally connected to groundĬontrols the biasing of transistor, Used to turn ON or OFF the transistorĬurrent flows in through collector, normally connected to load
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