BC857BT-7 Discrete Semiconductor Products

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Discontinued at Digi-Key
Transistor Type:	PNP
Current - Collector (Ic) (Max):	100mA
Voltage - Collector Emitter Breakdown (Max):	45V
Vce Saturation (Max) @ Ib, Ic:	650mV @ 5mA, 100mA
Current - Collector Cutoff (Max):	15nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce:	220 @ 2mA, 5V
Power - Max:	150mW
Frequency - Transition:	100MHz
Operating Temperature:	-55°C ~ 150°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	SOT-523
Supplier Device Package:	SOT-523
Base Part Number:	BC857BT

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BC857BT-7 is a bipolar junction transistor (BJT) specifically designed for low current, low noise amplifying of signals. It has a high frequency capability, low saturation voltage and good gain linearity, making it an excellent choice for applications such as low current amplifiers and switching circuits. In BJTs, the base-collector junction is referred to as the electrical gate that controls the current between collector and emitter. The gate is both an input and output connection and consists of a base, an emitter and a collector. When a voltage is applied to the gate, electrons are repelled from the base and attracted to the emitter, forming a current between collector and emitter. When the voltage is removed, the current stops flowing, effectively acting as a switch.BC857BT-7 has two common characteristics which make it ideal for certain applications. First, it has a low collector-base breakdown voltage, meaning that it can operate in a much lower voltage range than other BJTs. This makes it a good choice for circuits where a low operating voltage is essential, such as microcontrollers and other low-voltage applications.Second, it has an extremely low input capacitance. This means that it can be used in high-frequency circuits as well as low-frequency ones. The low capacitance also means that the BJT can respond quickly to changes in its input voltage, making it suitable for switching and other applications where response time is important.BC857BT-7 is a general purpose BJT and can be used in a wide range of applications. It can find use in amplifiers, switches, audio and video circuits, power switching, and logic circuits. It can also be used in transistor-transistor logic (TTL) circuits, in which it can serve as a switch or an amplifier. As it has low input capacitance and high current capability, it is also suitable for high-frequency circuits.In addition to its use as a switch or an amplifier, BC857BT-7 can also be used as a timing device. It is well-suited for use in astable, monostable, and bistable multivibrator circuits due to its low power consumption and its ability to produce both high and low frequency pulses. BC857BT-7 can even be used as a temperature-sensing device. When combined with a thermistor or thermocouple, the BJT can be used to measure temperature. Its low power consumption and low capacitance mean that it is an ideal device for use in temperature sensing circuits.In summary, BC857BT-7 is a general-purpose, low-current, low-noise bipolar junction transistor with a number of useful characteristics that make it an excellent choice for many applications. It can be used as an amplifier, a switch, a timing device, and a temperature sensing device. Thanks to its low voltage and low input capacitance, it is an especially good choice for microcontroller and high-frequency circuits.

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