BC857BS,135

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Introduction: BC857BS,135 is a PWM general-purpose, bipolar NPN transistor array. This complex device consists of eight interconnected NPN transistors and an emitter resistor, with low voltage drive capability. In applications where faster switching times or low logic current is desired, it offers a distinct advantage over discrete transistors.

Application Field and Working Principle: BC857BS,135 is generally used in switching applications, and is especially effective when used as the output stage of driver chips like CD4017 and CD40110, due to its ability to sink current faster and at lower voltages than a conventional bipolar transistor. The NPN array provides the current gain needed to control loads such as relays and solenoids. The array also helps reduce power dissipation, making it more efficient than other transistor solutions.

It functions as an input/output stage, connection the base of each NPN transistor to the respective collector of the last. An incoming signal is fed through the base of the first transistor, limiting current until amplified by the increased current gain of the array. As each transistor switches on and off, more current is transferred between the collector and emitter of each, effectively controlling the drain current. For example, for a logic 1 (high level) input, the first transistor will be in its active region, allowing a large voltage and current to be transferred to the second transistor, then to each one in the array in turn.

Since BC857BS,135 has, on average, a longer switching time than that of a single transistor, it is often used in applications where fast switching is not necessary or where input current is limited. The devices are also frequently used in LED controllers and digital logic circuits due to their low logic current and faster switching times.

Conclusion: BC857BS,135 is an effective, low cost solution for devices requiring efficient power handling and reliable performance. Its NPN transistor array and low voltage drive capability make it suitable for a variety of applications, from LED controllers to digital logic circuits. With faster switching times, low power dissipation, and low logic current, BC857BS,135 is an ideal solution for a number of applications.

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