So there is no such thing as a 'perfect' replacement - only one which is generally the same. Notice that most values (leakage, hfe, etc) have a range of possible values. *This information is for general informational purposes only, we will not be liable for any loss or damage caused by the above information. 1 Go look up a data sheet for the 2N3904.
The 3904 is definitely intended to be a signal amplifier, and has a gain bandwidth product. It looks from the datasheet that the 2n9013 has twice the Ic (continuous collector current) of 500mA, compared to a peak in the 3904 of 200mA. ON Semiconductor is dedicated to innovation and customer satisfaction, and is committed to providing its customers with the best semiconductor solutions to meet their needs. How good a replacement is a rather complex question, mostly revolving around what you are looking to do with it.
2N3906 TRANSISTOR SUBSTITUTE FOR 2N1307 PORTABLE
The company's products are designed to be energy efficient, reliable, and cost-effective, and are used in a variety of applications, including portable electronics, industrial automation systems, renewable energy systems, and automotive electronics. ON Semiconductor offers a broad portfolio of power management, analog, and discrete semiconductors, including power MOSFETs, diodes, rectifiers, and voltage regulators, among others. The company was founded in 1999 and is headquartered in Phoenix, Arizona. So, base current is calculated as 2.5 is divided by 0.001 2500 or 2.5K.
So 1mA is required at base of transistor to switch fan on. Calculation for transistor turn on amperage is calculated as 0.240A divided by Beta 300 0.0008. ON Semiconductor is a publicly traded company that designs, develops, and manufactures a wide range of semiconductor products for various applications, including automotive, computing, consumer, industrial, and communications markets. Voltage at pin one when limit is exceeded is 3.2V.
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