Category: Active
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TIP3055 NPN BJT
It is a power transistor capable of handling power dissipation up to 90W for a few microseconds(generally less than 300 microseconds). Also, it has a Vceo of 60 V and a collector current of 15A. TIP3055 is a widely used NPN power transistor that can handle high power and high voltage applications. It has a…
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BD139 Pinout
The BD139 is a general-purpose NPN bipolar junction transistor (BJT). It has three pins: There are two companies that manufacture the transistor The pinout diagram according to STMicroelectronics is as follows: When looking at the center hole and keeping the metal side down the pins are arranged from right to left as: It’s important to…
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Power Bipolar Transistors are limited by DC operations.
Power transistors are big bulky because they have to deal with a large amount of current in a very short amount of time. They are the fastest of all the transistors. Heat is the biggest enemy of the transistor. As silicon is heavily dependent on temperature. As the die temperature increases the more sensitive it…
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FAKE BD139 NPN transistors
I have recently found out that there are FAKE transistors in the market. I have a built a circuit design and when I bought the transistor from the Lajpat rai market in Delhi; I assembled the circuit on a test bench for measurements. But I was surprised that the BD139 did not work with 10mA…