CH330 is crystal-less, <$0.35 USB UART converter in a SOIC-8 package. The CH330N enumerates as CH340 or CH341 and its transfer speed goes up to ~2Mb/s.
Initially based on Jan Henrik's prototype board
| Reference | Value | Mfr. Part | Price |
|---|---|---|---|
| U1 | CH330N | CH330N | US$ 0.5518 |
| C2, C2 | 100n | CC0603KRX7R9BB104 | US$ 0.175 for 50 |
| D1, D2 | LED | 19-217/R6C-AL1M2VY/3T | US$ 0.282 for 20 |
| R1, R2 | 220 | 0603WAF2200T5E | US$ 0.12 for 100 |
| R3, R4 | 5.1k | 0603WAJ0512T5E | US$ 0.12 for 100 |
| P1 | USB_C_Plug_USB2.0 | U262-161N-4BVC11 | US$ 0.32 |
| J2 | |||
| PCB | US$ 20 for 5 with shipping |