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Diodes are semiconductor components made from a P-type (or metal in Schottky diodes) and N-type material (usually silicon, but germanium, selenium, and gallium arsenide can also be used), that allow current to flow in one direction only.

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1N4148 Diode for 3V-5V PWM

If you don't mind adding another IC, you could use a CMOS OR gate. Run from 5V, it will switch on 3.3V logic levels. There are varieties with different power levels, output current (fanout), and some …
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