Ive tried using a PN2222 instead of the BS170 thinking maybe I was getting to the current limit of the BS170 even though as measured I wasn't close. The display only draws 0.188A and there is only 7ohm across the MOSFET when the ATTiny is giving voltage on the gate. It turns on but it displays a weird white static pattern. It works great like this, however, when I put a BS170 MOSFET in the negative lead of the screen so that the ATTiny can turn it off the screen freaks out. I am using this display,, which I have modified to run on 5V by removing the converter. It monitors a switch and when the switch goes to off the ATTiny tells a Raspberry pi to safely shutdown but as soon as the switch goes off I want the display and power light to immediately turn off as a user confirmation that the unit is off. The maximum collector current of the 2N2222 is 800mA, whereas the bc547's is 100mA.īoth the 2N2222 and the BC547 have the same power dissipation (500mw), the 2N2222 has a DC gain of 75 to 300HFe and the BC547 has a DC gain of 110 to 800HFe, and the 2N2222 has a thermal resistance of 146k/w and the BC547 has a thermal resistance of 83.3 C/w.īecause the transition frequency of 2N2222 is 250MHz and that of BC547 is 300MHz, the noise figure on 2N2222 is 4db and on BC547 is 10db.I have an ATTiny85 that is controlling a power supply circuit. The voltage between the emitter and the base is 5 volts in 2N2222 and 6 volts in BC547. Great for many Fuzz pedal projects including MUFFN, Sriracha and GBOF. The collector to base voltage at 2N2222 is 60 volts, whereas it is 50 volts at BC547, and the collector to emitter voltage is 30 volts at 2N2222 vs 45 volts at BC547. NPN Transistor BC337 Alternate Muff Transistor. The 2N2222 has an emitter, base, and collector pinout, whereas the BC547 has a collector, base, and emitter pinout. The BC547 transistor came in a to-92 package, but 2N2222 transistors, such as the PN2222 and KN2222, also came in to-92 packages. The 2N transistors were packaged in a to-18 package, which means they were enclosed with metal. The 2N2222 transistor is more powerful than the BC547. Collector to Emitter Voltage (VCE) is 30V.Collector to Base voltage ( VCB ) is 50V.Collector to Emitter Voltage (VCE) is 45V.DC Current Gain range is 110 to 800 hFE.The maximum frequency on this frequency is 250MHZ, which is the 2N2222 transistor's transition frequency. The trigger terminal's maximum bias voltage is 200 mV, while the 2N2222 transistor's maximum bias current is 200 mA. The maximum collector current of the 2N2222 transistor is 800mA this is the greatest current that this device can handle. This transistor includes three pins & its each pin functionality is discussed below. Transistor Catalog PN2222 Datasheet, Equivalent, Cross Reference Search Type Designator: PN2222 Material of Transistor: Si Polarity: NPN Maximum Collector Power Dissipation (Pc): 0. The pin configuration of the 2N2222A transistor is shown below. The maximum current gain of the 2N2222 transistor is 300hFE, and this number determines the transistor's amplification factor. Equivalent 2N2222 transistors are 2N3904 (PNP), 2N2907 (PNP), 2N3906 (PNP), S9014, BC637, BC148, MPS2222, 2N4403, PN2222, KTN2222 & KN2222. A bipolar NPN transistor, the 2N2222 is a transistor with two poles.
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