BC856,215

Series:	Automotive, AEC-Q101
Packaging:	Tape & Reel (TR)
Part Status:	Active
Transistor Type:	PNP
Current - Collector (Ic) (Max):	100mA
Voltage - Collector Emitter Breakdown (Max):	65V
Vce Saturation (Max) @ Ib, Ic:	650mV @ 5mA, 100mA
Current - Collector Cutoff (Max):	15nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce:	125 @ 2mA, 5V
Power - Max:	250mW
Frequency - Transition:	100MHz
Operating Temperature:	150°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	TO-236-3, SC-59, SOT-23-3
Supplier Device Package:	TO-236AB (SOT23)
Base Part Number:	BC856

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Introduction

The BC856 and BC857 are two from a series of NPN and PNP small-signal transistors commonly used for switching and linear amplification applications. They are similar to the related BC856A and BC857A, which also form part of these family of devices. But these small packages are used in discrete, small applications as alternatives to large integrated circuits.

The BC856 and BC857 transistors are designed to operate across a large number of different circuits, with the vehicle being a small, discrete component that operates in a high-frequency environment. This means they are suitable for regulating the oscillations of both AC and DC components, and have been found to provide an effective switching solution for a variety of applications including logic gates, logic devices, and amplifiers.

Application Fields

The BC856 and BC857 transistors are primarily used for switching and linear amplifying applications. These useful components can be applied in a variety of circuits, including differential amplifiers, transistor oscillators, voltage regulators, and high-frequency amplifiers. Additionally, they can be used as a signal amplifier or can be used in a circuit designed to detect differences between DC and AC signals. As such, they have various uses in a number of electrical and electronic applications such as home automation, automotive, and communication systems.

Another application of these BC856 and BC857 transistors is in radio frequency (RF) oscillator and oscillator-intermediate frequency (IF) amplifier designs, where their small size allows them to fit into tight, space-constrained designs. When properly used, they can provide reliable switching and linear amplifying solutions for these applications.

Working Principle

When the bases of the NPN transistor of the BC856 and BC857 are current enabled, electrons are drawn from the emitter to the base, allowing current to flow from the collector to the emitter. This is the principle that makes them suitable for amplifying both AC and DC signals. A transistor is basically a three-lead semiconductor device that acts as a switch or an amplifier. The current entering the transistor is controlled by the entering current at the base. This current is then amplified and the amplified signal is used to power various applications.

The BC856 and BC857 transistors are formed of different materials. Oftentimes, they are made from Silicon or Germanium, while other materials such as Gallium Arsenide and Silicon Carbide can also be used. Silicon is the most commonly used material for these transistors and other types of transistors, but the material used in the construction of these transistors is largely dependent on the application for which it is used.

Conclusion

The BC856 and BC857 transistors are small-signal transistors that are used for switching and linear amplifying applications. These transistors can be used in circuits for detecting differences between AC and DC signals, RF and IF amplifiers, oscillators, and other applications. When the bases of these transistors are current enabled, electrons are drawn from the emitter to the base, allowing current to flow from the collector to the emitter. The BC856 and BC857 transistors may often be made with various materials, such as Silicon or Germanium, but the material used depends on the application that they are used in. Both of these transistors are useful components to have on hand when dealing with high-frequency applications.

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