CL, ZNR, CS as Reference Designators?

[Scutarius]

Hi,

I have a PCB that has some reference designators that I haven't seen before, just out of curiosity, I was wondering if anybody knows what CS stands for

This PCB has
NTCs as "CL", no idea why
MOVs as "ZNR" (I found that ZNR stands for Zinc-Oxide Non-liner Resistor)
but for "CS" I have no clue

it is SOD-123 diode (marking is "AF") but diodes do have "D" as Ref Des in this particular board.

[T3sl4co1l]

CurrentLimiter? Only for inrush, but maybe.  CR (crystal rectifier) common enough for diodes, not sure about CS.

Several have it as a zener: https://smd.yooneed.one/code4146.html

Tim

[Scutarius]

Thanks, yes, it is most likely a Zener

Sometimes you can tell the region where designers are, earth symbol style on schematic  or selection of negative colors (blue VS black) on equipment
Cheers!

[TimFox]

My guess for “CS” is “current source”, a two-terminal device or circuit that maintains a reasonably constant current value over a wide range of voltage across it.  Does that make sense for the overall circuit?

[Scutarius]

Not really, it doesn't make sense in once part of the circuit but in other is used as a  flyback diode. (it is actually a bad design overall, some parts doesn't make sense at all)

All ref des start with 0, as R0, D0 etc, and the revision code has a typical SW format, so I assume it most be a software engineer design ...?

[Scutarius]

My guess for “CS” is “current source”, a two-terminal device or circuit that maintains a reasonably constant current value over a wide range of voltage across it.  Does that make sense for the overall circuit?

You were right!
https://www.onsemi.com/pdf/datasheet/nsi45030-d.pdf