2SD2257,KEHINQ(J

Series:	--
Packaging:	Bulk
Part Status:	Obsolete
Transistor Type:	NPN
Current - Collector (Ic) (Max):	3A
Voltage - Collector Emitter Breakdown (Max):	100V
Vce Saturation (Max) @ Ib, Ic:	1.5V @ 1.5mA, 1.5A
Current - Collector Cutoff (Max):	10µA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce:	2000 @ 2A, 2V
Power - Max:	2W
Frequency - Transition:	--
Operating Temperature:	150°C (TJ)
Mounting Type:	Through Hole
Package / Case:	TO-220-3 Full Pack
Supplier Device Package:	TO-220NIS

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IntroductionThe 2SD2257,type of semiconductor device, which comes within the class of transistors named Bipolar Junction Transistors (BJT), is primarily used for the amplification of signals. It is single-junction type of semiconductor device with three terminals, the basis (B), collector (C) and emitter (E). Furthermore, due to the characteristics associated with this type of semiconductor, it has a wide variety of applications across industry sectors. Application Fields2SD2257 can be used for a wide range of applications such as variable frequency power supplies, switching power supplies, pulse meters, pulse amplitude modulators and switching regulators etc. In addition to these, this type of semiconductor can be used for the purposes of sampling, amplification, switching and time-delay. As far as the industrial sectors are concerned, the applications of 2SD2257 extend to automotive, computers, consumer electronics, communications, and healthcare among others. For example, this type of transistor might be used as audio power amplifying stage in TVs, motor control circuits in automotive, switching regulators in computers, frequency modulators in communication, and Analog-to-Digital Converters in healthcare. Working PrincipleThe 2SD2257 is a current-controlled type of BJT, i.e., the current flowing through the base will switch ON and OFF the collector current, thereby providing the amplification of the signal. When the current flows through the base, the collector-emitter current also increases, thereby increasing the collector voltage. This voltage on the collector, in turn, works as the output voltage of the device, hence providing the amplification of the signal. Furthermore, when the current through the base increases, the collector-emitter current also increases and the collector voltage decreases. This voltage on the collector, in turn, works as the output voltage of the device, providing the amplification of the signal. ConclusionThe 2SD2257 is a type of current-controlled Bipolar Junction Transistor (BJT). This type of semiconductor device has three terminals and it is generally used for the purposes of amplification of signals, such as audio power amplifying stages in TVs, motor control circuits in automotive, switching regulators in computers, frequency modulators in communication, and Analog-to-Digital Converters in healthcare. A current flowing through the base of the device switches ON and OFF the collector current, thereby providing the necessary amplification of the signal.

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