Higher Voltage Interfacing

Higher Voltage Inputs

A 74HC4049 or 74HC4050 can be powered at 2V to 6V and will accept input voltages up to +16V  (pin out is same, 74HC4049 just inverts the logic state).

4049 is basically the same but consumes a bit more current and has a min supply voltage of 3.5V.

Higher Voltage Outputs

A SN7417 is a 5V powered logic buffer which has open drain outputs that can drive loads up to 15V @ 30mA. SN7407 will do up to 30V @ 40mA and is cheaper

Logic To Darlington (open drain driving of higher voltages, relay switching etc)

ULN2803A

Logic To Source Driver Array (+V driving of higher voltages, relay switching etc)

MIC2981.  8 outputs.  Logic input (3/5V).  5V-50V 500mA rated outputs (de-rate for multiple outputs used at the same time). Be aware that the transistor drive outputs will drop 1.7V up to around 2.2V depending on the load.

 

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