Content for 2N4401

2N4401

2N4401 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. 2N4401 has a gain value hfe of 500; this value determines the amplification capacity of the transistor. 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. To bias a transistor we have to supply current to base pin, this current (IB) should be limited to 5mA. When this transistor is fully biased then it can allow a maximum of 800mA to flow across the collector and emitter. This stage is called Saturation Region and the typical voltage allowed across the Collector-Emitter (V­CE) or Base-Emitter (VBE) could be 200 and 900 mV respectively. 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.

Description Source

See alsoBC549 / BC639 / BC547 / 2N3055 / 2N3904 / 2N3906 / 2SC5200

Project  Lightning Detector

Lightning Detector

“It is often in the pursuit of one project that leads one to build others. For example, let us say that the work of Victor Frankenstein was being prepared for duplication at the premier Louisville, KY hackerspace; LVL1. Instead of …

Project  Predator Count Down Box

Predator Count Down Box

“This is a count down timer with some flair! This project was made as part of an assignment for an online engineering course. The purpose was to have a timer with a set time which would then prompt the user …

Project  Experimental Zener Diode Tester

Experimental Zener Diode Tester

“Automatic Zener diode tester is capable of identifying Zener diodes up to 27.5V. Apart from that, it can be used to recognize leads of the diodes/Zeners and detect damaged diodes. This tester is designed using well-known ICs such …

Project  ESP8266 WIFI Garage Door Remote

ESP8266 WIFI Garage Door Remote

“We use our garage more like a main entrance to the house, because using the actual front entrance tracks a lot of dirt into the house due to the poor layout. During the rainy season here on the west coast …

Project  Rain Detector

Rain Detector

“This rain detector will give you a heads-up the instant it starts to rain, hopefully giving you time to close windows and bring in possessions. The battery-powered circuit draws virtually no current when the sensor is dry and the current …