Background While resistors are obviously non-polarised, from a manufacturing point of view they might not be rotationally symmetric: specifically the labelling of 0805 SMD resistors. My board was designed with all the resistor orientations aligned, and specified labelled SMD components (from Panasonic): so I was very surprised to receive a batch of boards for approval with half the resistors rotated 180. They had a very reasonable explanation: they are random in the reel from the manufacturer.
Question
Can I and should I solve this?
- Do some pick and place machines read the writing for orientation? (If so, I could use a different manufacturer)
- Is it usual for SMD resistors to be randomly oriented on the tape? (If not, find another resistor manufacturer)
- Is there consensus that label orientation doesn't matter? (If so, I'm probably fighting a losing battle.)
In through-hole days, we certainly considered it sloppy if the resistors weren't all right-reading: it just prevented errors.