![]() Note: Where the IC and load have different supply voltages, for example 5V for the ICīut 12V for the load use the formula below for R B: R B = Use the formula below to find a suitable resistance for R B and choose the nearest standard value. The value which just saturates the transistor. The base resistor (R B) must allow sufficient current to flow to ensure the transistor isįully saturated when switched on and it is good to make the base current (I B) about five times Work out a value for the base resistor R B Times the load current Ic divided by the maximum output current from the IC.Ĥ. The transistor's minimum current gain h FE(min) must be at least 5.The transistor's maximum collector current Ic(max) must be greater than the load current:. ![]() Work out the transistor properties requiredĬhoose a transistor of the right type (NPN or PNP from step 1) to meet these requirements: Note: avoid confusing IC (integrated circuit) with Ic (collector current).
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