STD1802T4-A

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Transistor Type:	NPN
Current - Collector (Ic) (Max):	3A
Voltage - Collector Emitter Breakdown (Max):	60V
Vce Saturation (Max) @ Ib, Ic:	400mV @ 150mA, 3A
Current - Collector Cutoff (Max):	100nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce:	200 @ 100mA, 2V
Power - Max:	15W
Frequency - Transition:	150MHz
Operating Temperature:	150°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	TO-252-3, DPak (2 Leads + Tab), SC-63
Supplier Device Package:	DPAK

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The STD1802T4-A is a single bipolar junction transistor (BJT) that can be used in a wide range of applications. BJTs have three terminals, and a current flow between them is used to amplify an electrical signal. The STD1802T4-A has an NPN type, meaning that its main current flow is from terminal C (collector), to terminal E (emitter). The current is limited by the second terminal, B (base), which is connected to a voltage source. The operation of the STD1802T4-A is based on the principle of minority-carrier injection. This means that current is passed through both the N and P regions of the transistor. This current is then amplified so that a small current in the base terminal can control a large current at the collector terminal.The STD1802T4-A can be used in applications such as switching, audio amplification, signal conditioning, voltage regulation, and signal modulation. Its fast switching times and low power dissipation make it ideal for use in digital systems. It can also be used in analog circuits for signal conditioning or amplification.In switching applications, the STD1802T4-A functions like an electronic switch. When the base current is turned on, it causes the transistor to turn off, by making the collector-emitter current too small to pass through the load. This is known as cutoff. When the base current is turned off, the transistor turns on, and the collector-emitter current can pass through the load. This is known as saturation. The switching action of the transistor can be used to control the flow of other elements, such as relays, motors, and LED indicators. In audio amplification applications, the STD1802T4-A functions as an amplifier. When an audio signal is applied to the base terminal, the current is amplified so that it can drive a loudspeaker. The amplitude of the signal is controlled by the base current, and the gain of the amplifier depends on the ratio of collector current to base current.In signal conditioning applications, the STD1802T4-A can be used to convert a voltage signal into a corresponding current signal. This is useful in transducers where the output of the transducer is an electrical voltage, but the load requires a current signal. The current signal is generated by passing a voltage signal through the base-emitter junction of the transistor, and then amplifying the current through the collector-emitter junction.The STD1802T4-A can also be used in voltage regulation applications. In this application, the circuit is connected to a power source, and the base current is adjusted so that the collector voltage remains constant, regardless of any changes in the load. This is achieved by controlling the gain of the transistor, so that any increase in the load voltage is matched with a corresponding increase in the collector voltage.Finally, the STD1802T4-A can be used in signal modulation applications. This involves using the transistor to control the amplitude or frequency of a signal. For example, it can be used to modulate an audio signal, so that different frequencies are heard in the output.The STD1802T4-A is a highly versatile component, and can be used in a wide range of applications. Its fast switching times and low power dissipation make it an ideal choice for use in digital systems, and its ability to convert voltage signals into current signals makes it a useful component in transducers. In addition, its use in audio amplification and signal modulation applications gives designers a great deal of flexibility. It is a reliable component that can be relied upon to deliver good performance in all of these applications.

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