JLCPCB is an offshore (Chinese) low cost quick turn PCB manufacturer that can also perform PCB assembly (SMT components only). I've had a half dozen or so boards built by them so far and their SMT assembly service has saved me countless hours of populating SMT passives (resistors, capacitors, inductors) under the microscope. Here are some things I've learned while using jlcpcb that will likely save you a TON of time and effort. #1. JLCPCB's parts library is NOT the same as LCSC's JLCPCB (PCB fab + assembly) is related or owned by the same company that owns LCSC (parts supplier, think DigiKey, Mouser, Arrow) BUT JLCPCB's parts library is only a relatively small subset of LCSC parts . You'll want to search JLCPCB's parts catalog for parts, these are the only ones that JLCPCB can populate on your PCBs. Don't do what I've done and put together a BOM for a PCB using LCSC parts and then find out that 90% of these parts aren't availa