BUL58D Datasheet/PDFThe BUL58D is an NPN epitaxial planar silicon Darlington transistor featuring high current gain, low voltage levels and wide range of operating conditions. This device is well suited for use in a variety of low voltage and relatively high current logic switching applications. It has a low voltage collector-base breakdown voltage (VCBO) of about 35 volts and can operate over a wide range of collector current from a few milliamperes to several amperes. The device also has a standard high-voltage breakdown of 800 volts and is used in many applications where a small voltage level is required to drive a load.
The BUL58D is commonly used in automotive, consumer electronics, and power supply designs. For automotive applications, the BUL58D is used in electronic throttle control systems to drive the throttle valve and fan sweep control. In consumer electronics, it is used in VCRs, CD changers and home theater systems. In power supplies, it is used as a current booster to increase voltage levels and as a switching device to control the DC-DC converter.
The BUL58D is a 3 terminal device with a collector, base and emitter. Its working principle is based on the principle of electron charge transfer. As current is applied to the base terminal, a base current is generated. This current creates a field effect in the semiconductor structure which causes the current to flow from the collector to the emitter. The base current increases as the current applied increases, resulting in an increase in current flow from the collector to the emitter. This is known as the current gain of the device.
The BUL58D transistor is typically used as an amplifier and a switch. When used as an amplifier, the device amplifies the input signal to create an output signal. When used as a switch, a small voltage can be used to control a much higher voltage or current.
The main advantage of the BUL58D is that it can have very high current gains (e.g. 1000 times above) while also having a low input capacitance. This allows it to be used as a high-performance amplifier or switch in applications where a large number of inputs need to be amplified or controlled quickly.
The BUL58D is an incredibly versatile device, and can be used in many different applications. Its high current gain, low voltage levels and wide range of operating conditions make it an ideal device for a variety of low voltage and high current logic switching applications.