PN3643

Series:	--
Packaging:	Bulk
Part Status:	Obsolete
Transistor Type:	NPN
Current - Collector (Ic) (Max):	500mA
Voltage - Collector Emitter Breakdown (Max):	30V
Vce Saturation (Max) @ Ib, Ic:	220mV @ 15mA, 150mA
Current - Collector Cutoff (Max):	50nA
DC Current Gain (hFE) (Min) @ Ic, Vce:	100 @ 150mA, 10V
Power - Max:	625mW
Frequency - Transition:	--
Operating Temperature:	-55°C ~ 150°C (TJ)
Mounting Type:	Through Hole
Package / Case:	TO-226-3, TO-92-3 (TO-226AA)
Supplier Device Package:	TO-92-3
Base Part Number:	PN3643

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PN3643 Application Field and Working PrincipleThe PN3643 is classified as one of the most popular transistors in the “Bipolar Junction Transistors (BJT) - Single” group. It is one of the reliable and cost-effective options for a variety of circuit designs and applications since it has a maximum power rating of 100 mW and a maximum voltage rating of 500 V. The PN3643 operates in two distinct modes: active and saturation. In active mode, the PN3643 behaves like a switch, allowing current to flow through it when there is a small forward bias voltage applied to its base. When the transistor is in saturation mode, the transistor will have a large forward bias voltage applied to its base and will be completely shut off as a result. In terms of its application fields, the PN3643 is especially known for its wide use in consumer electronics and automotive markets. This can be attributed to its relatively low voltage and power ratings compared to other BJT transistors, which make it more affordable without compromising its performance. Apart from consumer and automotive applications, the PN3643 is also popular in telecoms and industrial markets. It is commonly used in communication components, such as data converters, RF amplifiers, and detectors. It is also used for controlling the power flow in industrial motor drives and for switching critical circuits in consumer and automotive markets. In terms of the working principle of the PN3643, it is a general-purpose NPN transistor. Its main function is to control the power flow in a given circuit through the amplification of current. Its two main pins are the collector and the emitter, which are the two ends of the transistor that are connected to the load. The power flow between collector and emitter is controlled by the current flowing through the third pin, which is the base. When a small voltage is applied to the base, it allows the current to travel between collector and emitter. This causes the current flowing through collector and emitter to increase proportionally to the small input voltage provided in the base, thus causing amplification in the current. When a large voltage is applied to the base, it causes the current to decrease and eventually shut off the flow of current between collector and emitter. This can be very useful for controlling the current flow in a given circuit.The PN3643 is one of the most versatile transistor types available, due to its relatively low voltage and power ratings. It is popularly used in a wide range of applications, such as consumer electronic and automotive markets, telecoms, and industrial markets. Its main function is to control the power flow in a given circuit through the amplification of current between collector and emitter pins.

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