5 ms·5V compatibility and 40mA per pin has associated costs. You won't get that in a cheap ARM device.by kevin_thibedeau 4y ago5V compatibility and 40mA per pin has associated costs. You won't get that in a cheap ARM device.szundi 4y agoThat can save a dollar on other partsilyt 4y agoThat's mostly effect of production node. Smaller transistors get you better uA/MHz but lower currents (unless manufacturer just decides to spend more die space on output transistors) and lower running voltage