Transistor is an electronic device used for amplification or switching of electrical signals. NPN transistor is a type of Bipolar Junction Transistor (BJT), which is a current controlled device. Term wideband transistor is used for the transistor which can operate at high transition frequencies.
Utsource BFG591 is a NPN 7 GHz wideband transistor. Device is manufactured using silicon planar epitaxial technique. Effect of parasitic capacitance and inductance become significant which degrades the performance of the system if not accounted for in the design. This device offers high noise figures and stability.
Features of BFG591
- High power gain
- Low noise figure
- High transition frequency
- Gold metallization ensures excellent reliability
Pictorial view of the transistor is shown in figure below, it is available in SOT223 package
Pin description and pin diagram of the BFG591 is shown below
IC Electrical Characteristics/ Specifications/datasheet
Some Electrical characteristic of the device are given below
Collector to base voltage with emitter open
Collector to emitter voltage with base open
Collector current DC
Total power dissipation
DC current gain
Maximum unilateral power
0 To 150 C
-65 to 150 C
BFG591 is a NPN transistor which means it has P type Base and N type Collector and Emitter. Transistor can be biased in one of its three regions of operation which will determine whether the device will work as a switch or as an amplifier. For a transistor to function as a switch it has to be biased in the saturation and cutoff region of its characteristics curve which in turn will represent ON and OFF state of the switch. In order to use a transistor as an amplifier it has to be biased in the active region of its characteristic curve.
Applications and Price
BFG591 can be used in following applications
- GHz range applications
- MATV amplifier
- CATV amplifier
- RF communication equipment.
- BFG591 price could be found from different places
Circuit diagram of broadband amplifier using BFG591 is shown below. Resistor R1 and R2 determines the gain of the circuit while resistor R3 determines the impedance of the circuit.
500mW Linear Amplifier
Circuit diagram of linear amplifier using BFG591 is shown below, two transistors are used to produce output power of 500 mW.