š Key Concepts
ā¢ Focus on symbols 1 and 2 only; they are the bipolar junction transistor (BJT) symbols in this illustration.
ā¢ Remember that in a BJT, the emitter lead is the one with the arrow, and the arrow direction distinguishes NPN vs PNP.
ā¢ Use the electronics mnemonic: "NPN = Not Pointing iN" (so the other direction corresponds to PNP).
š Think About
ā¢ Which of the symbols clearly shows three leads labeled as base, collector, and emitter (or similar), rather than gate, source, or drain?
ā¢ On those BJT symbols, look at the arrow on the emitter: which one has the arrow pointing into the transistor body instead of out?
ā¢ Once you identify which direction corresponds to NPN using the mnemonic, which remaining symbol must then represent PNP?
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Before You Answer
ā¢ Confirm that the symbol you choose has terminals labeled B (base) and C (collector); PNP and NPN BJTs both must have these.
ā¢ Verify that the emitter is the lead with the arrow, and that for PNP the arrow points toward the transistor body.
ā¢ Make sure you are not selecting a FET symbol (gate, source, drain labels such as G, D, S indicate it is not a BJT).