BD911

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

Bipolar junction transistors, also known as BJTs, are one of the most commonly used devices in modern electronics due to their ability to switch and amplify electrical signals. Although there are many types of BJTs, the most popular one is the single-junction transistor, which is typically denoted as the BD911. The BD911 is a general-purpose, medium-power NPN switching transistor which is commonly used for amplification and switching applications.

The BD911 consists of three terminals: the base, the collector and the emitter. The base is the controlling terminal of the transistor and Voltage is typically applied to here in order to activate the transistor. When the base is Forward biased by the input voltage, holes and electrons transit across the junction. This results in the transistor’s current amplification capability, which allows it to control the current flow through the emitter-collector path.

In terms of its application field, the BD911 can be used to amplify a wide range of signals, such as audio or RF signal. It can also be used as a switch as it is able to control the current flow through a circuit. It is most commonly used as an amplifier or switch because of its fast switching time, low cost and its ability to work under harsh environments.

However, the initial current gain of the BD911 is relatively low and it can only have a maximum gain of about 50. Furthermore, the maximum collector-emitter voltage of the transistor is only about 30V. Therefore, it cannot be used in applications which require high gain or high-voltage amplifications.

In terms of its working principle, the operation of the BD911 is based on the movement of electrons and holes. When a Voltage is applied to the base terminal, it Forward biases the junction, allowing electrons and holes to move from the emitter and base region to the collector region. This creates a current flow from the collector to the emitter. This collector current can then be used to control the current flow through the emitter-collector path. As a result, the BD911 is able to amplify and switch signals.

In summary, the BD911 is a single-junction NPN switching transistor which is commonly used for amplification and switching applications due to its fast switching time, low cost and ability to work under harsh conditions. It operates by Forward biasing the junction, allowing electrons and holes to move from the emitter and base region to the collector region. As a result, the current flow through the emitter-collector path can be controlled and the signal can be amplified or switched. However, the BD911 has a relatively low maximum current gain and it is unable to work in high-gain or high-voltage applications.

The specific data is subject to PDF, and the above content is for reference