BC857AT-7

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:	125 @ 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:	BC857AT

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BC857AT-7 is a type of bipolar junction transistor (BJT). It is a single-pole, single-throw (SPST) transistor and is a type of current-controlled device, making it highly versatile in a wide range of applications.

The BC857AT-7 transistor is an NPN type and its terminals are comprised of three legs. The first leg is known as the collector, the second is called the base, and the third is called the emitter.

The working principle of the BC857AT-7 lies in the fact that it can essentially act as a switch, which can be activated with just a small signal at the base. It is the flow of current in the circuit that controls the current flow from the collector to the emitter.

When reverse bias is applied, the base-emitter junction of the BC857AT-7, becomes a closed circuit, thus preventing current from flowing from collector to emitter. In this mode, the transistor is said to be “OFF”. Conversely, when a forward bias is applied, the base-emitter junction turns open, allowing current to flow from the collector to the emitter. In this mode, the transistor is said to be “ON”.

The BC857AT-7 is suitable for a wide range of applications such as small signal amplifying and switching, as well as digital and analog circuit controlling. It is also mainly used in battery-powered electronic devices, as well as small-current and low-frequency amplifying circuits.

In terms of its design and specifications, the BC857AT-7 is dimensionally small, making it ideal for surface-mount designs. It has a maximum collector to emitter voltage (VCEO) of 35 Volts and collector currents of up to 100 mA, operating at high switching speeds.

Additional features of the BC857AT-7 include an operating temperature range from -65°C to +150°C, a power dissipation of 625 mW, a transition frequency of 250 MHz, and low thermal resistivity.

To conclude, the BC857AT-7 is a highly versatile single-pole single-throw bipolar junction transistor that is suitable for a wide range of applications. It offers low thermal resistivity, high switching speeds and a wide range of collector currents. Additionally, its small design makes it suitable for surface-mount designs, making it an ideal choice for numerous applications.

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