BD680ASTU

Series:	--
Packaging:	Tube
Part Status:	Active
Transistor Type:	PNP - Darlington
Current - Collector (Ic) (Max):	4A
Voltage - Collector Emitter Breakdown (Max):	80V
Vce Saturation (Max) @ Ib, Ic:	2.8V @ 40mA, 2A
Current - Collector Cutoff (Max):	500µA
DC Current Gain (hFE) (Min) @ Ic, Vce:	750 @ 2A, 3V
Power - Max:	14W
Frequency - Transition:	--
Operating Temperature:	150°C (TJ)
Mounting Type:	Through Hole
Package / Case:	TO-225AA, TO-126-3
Supplier Device Package:	TO-126
Base Part Number:	BD680

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Introduction to the BD680ASTU

The BD680ASTU is a high-quality, low-cost, single-transistor bipolar junction transistor (BJT) commonly used for smaller, more precise low-noise amplifiers. Its origins can be traced back to the first BJTs developed in the 1940s, and since its launch in the 1960s it has become an essential component for many electronic applications. The BD680ASTU is a popular choice due to its high gain, low noise, small size and low cost. It is also highly reliable and can be used in many different kinds of circuits. The main application areas for the BD680ASTU are audio amplifiers, linear amplifiers, switched-mode power supplies, radio transmitters, radio receivers and oscillators.

The Form and Structure of the BD680ASTU

The BD680ASTU is a single-transistor BJT with three leads: an emitter, a base and a collector. It is housed in a TO-18 package and includes a base-collector junction insulation resistor (RC) for protection purposes. The transistor is fabricated in a lateral epitaxial planar configuration and features a planar double-diffused NPN structure for maximum performance and efficiency. The semiconductor used for the BD680ASTU is made of a layer of P-type silicon material for the collector, N-type material for the emitter and a base layer of N-type material sandwiched between the collector and the emitter. The base-collector junction insulation (RC) is set to 0.7V in the standard version of the BD680ASTU. The BD680ASTU has an obvious advantage over other transistors, as it is largely immune to thermal runaway and saturation, ensuring reliable operation.

Working Principle of the BD680ASTU

The working principle of the BD680ASTU is based on the principle of a BJT and involves the application of a voltage across the base-emitter junction to create a current flow through the transistor. This current flow, in turn, creates a voltage across the collector-emitter junction, which is proportional to the base current.The BD680ASTU is a current-controlled device, meaning that the amount of current flowing through the transistor is determined by the amount of current that flows through its base terminal. The amount of current flowing through the base terminal is regulated by the voltage applied to the base-emitter junction. This is why the BD680ASTU is commonly used in small-signal amplifiers, as it is able to accurately regulate and control the amount of current flowing through its other terminals.

Application Field and Working Principle of the BD680ASTU

The BD680ASTU is a popular choice for small-signal, low-noise amplifiers. Its main application areas are high-precision audio amplifiers, linear amplifiers, switched-mode power supplies, radio transmitters, radio receivers and oscillators. The BD680ASTU operates on the principle of a BJT and is a current-controlled device. When a voltage is applied to its base-emitter junction, it creates a current flow through the transistor, which in turn creates a voltage across the collector-emitter junction. This voltage is proportional to the applied base current, allowing for an accurate and precise control of the current flow.The BD680ASTU\'s small size, low cost and high reliability make it a popular choice for many types of applications. It is also highly reliable and can be used in many different kinds of circuits.

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