Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Transistor Type:	PNP
Current - Collector (Ic) (Max):	500mA
Voltage - Collector Emitter Breakdown (Max):	25V
Vce Saturation (Max) @ Ib, Ic:	700mV @ 50mA, 500mA
Current - Collector Cutoff (Max):	100nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce:	250 @ 100mA, 1V
Power - Max:	300mW
Frequency - Transition:	100MHz
Operating Temperature:	-55°C ~ 150°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	TO-236-3, SC-59, SOT-23-3
Supplier Device Package:	SOT-23-3 (TO-236)
Base Part Number:	BC808

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BC808-40LT1 Application Field and Working Principle

Transistors - Bipolar (BJT) - Single

BC808-40LT1 is a TRANSISTOR, bipolar, silicon, NPN, TO-92 type. It is a good choice and affordable part for general-purpose switching and amplifier applications.BC808-40LT1 has three terminals, namely collector, base and emitter. The collector is the central terminal and is used to supply the current from the circuit to the transistor. The base provides the controlling current to the collector and the emitter is used to dissipate the collected current from the transistor. Since BC808-40LT1 is a NPN type transistor and its collector-base junction is a reverse-biased diode, the base current flow is the key factor in determining the overall performance of the BC808-40LT1. The amount of current flowing through the base determines the amount of current flowing through the collector and vice versa. Furthermore, the BC808-40LT1 has a current gain of 40, meaning that for every one-unit current flowing through the base, 40-units of current will flow through the collector. The application field of BC808-40LT1 includes general-purpose amplifiers, low-noise amplifier, current switches, relay drivers, digital logic circuitry and timing circuits. Since it is a small-signal transistor, the BC808-40LT1 can be used for switching and amplification related applications that require low noise and low power input. The BC808-40LT1 can also be used in low-frequency pre-amplifier stages of audio-circuits. The TO-92 package is designed with very low noise characteristics and makes the BC808-40LT1 an excellent choice for all pre-amplifier parts. In addition to the application fields mentioned, BC808-40LT1 can also be used in small-signal amplification in general-purpose applications, such as alarm systems, audio circuits, electronic toys, etc. The high current gain, large output load capability, low noise and low drive current makes the BC808-40LT1 an ideal choice for these applications. The working principle of the BC808-40LT1 is similar to any other NPN type transistor. When a positive current is applied to the base terminal, it creates an electric field in the base-collector junction. This electric field helps to attract the electrons from the base to the collector, thus allowing current flow from the collector to the emitter. The resulting current flow is increased by the factor of 40, depending upon the design of the transistor and its current gain ratio. When the current flowing to the base is reduced, the current flow from the collector to the emitter is also reduced. This is because the electric field is neutralized by the reduced current and the electrons are attracted back to the base terminal, thus restricting the current flow. Thus, the BC808-40LT1 is a reliable and versatile transistor that is used in many audio and electronic circuits across the world. Its low noise characteristic, large current load capacity and current gain ratio of 40 make it an ideal choice for general-purpose amplifier applications.

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