I am in the process of designing a PCB that incorporates a microcontroller, LEDs, capacitive sensors and relays to control light in my smart car. I have taken this picture as my reference.I have the little stuff worked out and have it prototyped and working, but I want some outside input on the relays on the board.
The relays are S2-L2-24v 4A NAIS relays. They are triggered by the microcontroller when it receives a certain input.(I take this datasheet as my reference: http://html.alldatasheet.com/html-pdf/132762/NAIS/RA-RELAYS/98/1/RA-RELAYS.html)
I want to make sure that I have adequate trace widths to support the relays when an auxiliary component is triggered. Right now I plan to use 1 oz copper for the board when I have it printed (trace width is 150 mil on the relays and power). I have attached the PCB design to this post.
Each individual relay would have a max of 1A /30V on it, and all power lines on the board are fuse protected. In all reality, it is likely that only one relay would be on at a time.
I am new to incorporating these things in to a PCB, so I may be approaching this completely wrong. Am I using the right relays? So any suggestion will greatly be appreciated!
davep238 wrote:S2-L2-24v appears to be a _latching_ relay with a 24vdc coil. I found a datasheet here: http://www.newark.com/panasonic-electri ... dp/24M8044.
The datasheet you linked to is a SMT _microwave_ relay, which is not what you want. Neither relay bares any resemblance to your PCB layout. BTW, you can run some red traces to the RJ45, instead of all blue traces. can you also post the schematic diagram?
DanV wrote:The closest Newark part I found was at
http://www.newark.com/omron-electronic- ... chDocsHook
But it has blade looking pins (0.8 x 2.8 mm (0.030" x 0.109") (although it says through-hole, solder) and current rating is not shown.
http://www.farnell.com/datasheets/18302 ... 1377176169
says "Min. Carry / Switching Current DC12V 1A"
also "Continuous carry current 15A"
Some discrepancy in the ratings.
I would think a silver composite contact rated for 15A could switch less than 1 A without an issue.
n1ist wrote:The minimum current is to clean the contacts and break down any oxide buildup. Otherwise, you can end up with a higher contact resistance at low currents.
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