JLCPCB / EASY Eda Relay 3.3 Volt
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Enrico Durso 2 months ago
Hi, I see a lot of relays available in the JLPCB library. Anyone knows some models which are solderable from JLPCB and which can be activated with 3,3 Volt (ESP32 pin?) The load has a maximum of 700ma so not much. Thanks
Comments
andyfierman 2 months ago
The part information in the JLCPCB Assembled library needs to be improved: in many categories, such as Relays, it is very hard to identify suitable parts. The quickest way to do this is to: 1. search: [https://lcsc.com/products/Relays_531.html](https://lcsc.com/products/Relays_531.html) 2. then use the LCSC Cxxx part number to check which suitable parts are also in the JLCPCB Assembled library.
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JLCPCBsupport 2 months ago
@andyfierman The parts at JLCPCB library get the information from the LCSC database, you can notice that the LCSC website is facing some search issues but it will be sorted out soon, once the LCSC make it clear for users then our lirary will follow, it is a fact that some information are no longer there like current voltage values, same for ampedance etc, this will be considered once LCSC arrange their database.  @[Enrico Durso](https://easyeda.com/e.durso7) please consider that all the parts available at [JLCPCB parts library ](https://jlcpcb.com/parts) : [https://jlcpcb.com/parts](https://jlcpcb.com/parts) are available for assembly. We can suggest the C93168 relay but please check the datasheet before prceeding to place your order, this way you make sure that you are picking up the appropriate part, please consider the coil polarity while you make your design. Reading the part datasheet is a key. Another solution for the ESP design is the use of a transistor between the MCU and the Relay coil (this is highly recommended whatever the coil voltage is) or you can use an optocoupler for higher isolation and logic level shifting, a level shifter Integrated circuit is also an option. Good luck.
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Enrico Durso 2 months ago
Hi @JLPCB Thanks for your reply. Am checking C932168, but I have got a hard time understanding the input and the output given this schematic: ![ll.png](//image.easyeda.com/pullimage/INpbUfq9yZbTY06gRisISITF97FXjohu1NXQPTPZ.png) I think 1 is 3.3V, 8 is GND, but what is input/output and signal? Thanks
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andyfierman 2 months ago
@e.durso7, It's a relay. A relay is nothing more than an electromagnetically operated switch. The contacts can be connected any how you like. You may find it helpful to read the English version of the datasheet from the Omron site here: [https://omronfs.omron.com/en_US/ecb/products/pdf/en-g6k.pdf](https://omronfs.omron.com/en_US/ecb/products/pdf/en-g6k.pdf)<br> <br> Note that the relay that JLCPCB Support suggested is a latching relay which will save power but requires a bipolar drive so is harder to use than a simple non-latching relay. This is why the coil polarity is important on a latching relay. A simple open collector or open drain transistor relay drive will not work with a latching relay. Using an an optocoupler for higher isolation and logic level shifting makes the relay drive even more complicated and is rarely necessary unless a suitable isolation voltage rated relay is unavailable. This is because relays are used precisely to obtain isolation and level shifting between the relay driving and the relay contacts side. For simplicity try to find a simple non-latching relay. Then you can use a simple open collector or open drain external transistor to drive it. Don't forget to include a flyback diode across the coil if there is not one already incorporated into the relay. If there is a flyback diode incorporated into the relay, then again the polarity of the relay coil is imprtant to note. If there is no built-in flyback diode then the coil polarity is irrelevant. Depending on the load that you need to switch it may be simpler to use a logic level N channel MOSFET as a low side - or a P channel MOSFET as a high side - switch instead of a relay and driver. @JLCPCBsupport, I have seen that there are problems with the LCSC site but when I tried it before answering this post, I found that it was possible to easily search for and identify relays on the LCSC website and that pasting the LCSC part number into the EasyEDA SHIFT+F Library tool and then locating the part in the JLCPCB Assembled section worked very nicely: ![image.png](//image.easyeda.com/pullimage/SjYyhy1kdy4kKE3eIPZtVIpDEwuF5jp4ay5kHk7e.png) ![image.png](//image.easyeda.com/pullimage/zNuWjc5bOxbnNFylfYfjgZggQKlC3pnhPrhvxs9U.png) <br> <br>
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JLCPCBsupport 1 month ago
@andyfierman The task is easy when you have the part number but if someone search for a part through its physical value then it is not as easy as it looks, it will be sorted out soon :)
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andyfierman 1 month ago
@JLCPCBsupport, That's exactly why searching the LCSC.com website is better at the moment. As my screenshots show, the parameter filtering on there works ok so it is easy to find things and then, once a suitable part has been identified and selected, copy and paste the LCSC part number back into the EasyEDA Library tool to find the Symbol and Footprint. :)
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andyfierman 1 month ago
Until the underlying problem with the integration of the LCSC, JLCPCB and EasyEDA libraries is solved,my workaround seems like a reasonable solution for people who may have pressing design deadlines to meet. :)
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