4 layers155 × 93 mm
4 layers33 × 46.4 mm
USB2DXL
koki0517/USB2RS485_TTLUSBをRS485/TTLに変換する
- Size
- 33 × 46.4 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 46
- Nets
- 37
- Pads
- 157
- Tracks, vias
- 212, 85
- Pours
- 13
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 30 Jun 2025
- Updated
- 5 Nov 2025
Overview
USB2DXL is an open-source printed circuit board by koki0517, from the koki0517/USB2RS485_TTL repository on GitHub, published under the Apache-2.0 licence. It is a 4-layer board of 33 × 46.4 mm with 46 parts on 37 nets, routed with 212 tracks and 85 vias.
It is built around the CH340E, SP485EEN-L/TR and 74AHC1G08GW, with the 78L05G-AB3-R among its other parts. Its parts include 15 resistors, 10 capacitors, 7 ICs, 7 connectors and 3 diodes. It belongs with the interfaces and adapters boards of this library.
Main components
4
CH340E
MSOP-10150uA 20mA 2Mbps 3.3V、5V Transceiver USB 2.0 MSOP-10 USB Converters ROHSWCH (Nanjing Qinheng Microelectronics)USB Converters
SP485EEN-L/TR
SOIC-8-40℃~+85℃ 1 1 10Mbps 4.75V~5.25V 900uA Half-Duplex Transceiver ±15kV SOIC-8 RS-485 / RS-422 ICs ROHSMaxLinearRS-485 / RS-422 ICs
74AHC1G08GW
SOT-353-40℃~+125℃ 1 1.5V~3.85V 1.9V~2V、2.9V~3V、3.7V~3.94V、4.4V~4.5V 100mV、360mV~550mV 10nA 2 2V~5.5V 500mV~1.65V 74AHC Series 9.5ns@3.3V,15pF AND Gate Overvoltage-tolerant input StandardCMOS SOT-353 Logic Gates ROHSMDDLogic Gates
78L05G-AB3-R
SOT-89-3-40℃~+85℃ 1 1.7V@(40mA) 100mA 2mA 30V 40uV 5V 80dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal Shutdown Positive SOT-89-3 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSUTCVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdUSB2DXL
Parts
46| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 0.1u | Capacitor_SMD:C_0402_1005Metric | C2, C3, C4, C5, C7, C8, C9 |
| 3 | 10 | Resistor_SMD:R_0402_1005Metric | R7, R8, R10 |
| 3 | 10k | Resistor_SMD:R_0402_1005Metric | R12, R14, R15 |
| 3 | 4k7 | Resistor_SMD:R_0402_1005Metric | R3, R5, R6 |
| 2 | 5k1 | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 2 | 74AHC1G08 | Package_TO_SOT_SMD:SOT-23-5_HandSoldering | U6, U7 |
| 2 | Conn_01x03 | Connector_JST:JST_EH_B3B-EH-A_1x03_P2.50mm_Vertical | J3, J5 |
| 2 | Conn_01x04 | Connector_Molex:Molex_SPOX_5267-04A_1x04_P2.50mm_Vertical | J6, J7 |
| 2 | LED_Small | LED_SMD:LED_0603_1608Metric | D1, D2 |
| 1 | 0.33u | Capacitor_SMD:C_0603_1608Metric | C6 |
| 1 | 10k | Capacitor_SMD:C_0402_1005Metric | R13 |
| 1 | 150 | Resistor_SMD:R_0402_1005Metric | R9 |
| 1 | 1k | Resistor_SMD:R_0402_1005Metric | R4 |
| 1 | 220k | Resistor_SMD:R_0402_1005Metric | R11 |
| 1 | 47u | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C10 |
| 1 | 4n7 | Capacitor_SMD:C_0402_1005Metric | C1 |
| 1 | 78L05G-AB3-R | Package_TO_SOT_SMD:SOT-89-3 | U3 |
| 1 | CH340E | Package_SO:MSOP-10_3x3mm_P0.5mm | U1 |
| 1 | Conn_01x04 | Connector_JST:JST_XA_B04B-XASK-1_1x04_P2.50mm_Vertical | J4 |
| 1 | Green | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D3 |
| 1 | ISO7741DWR | ISO7741DWR:SOIC127P1030X265-16N | U2 |
| 1 | SP485EEN-L/TR | SP485EEN-L/TR:NSOIC-8 | U4 |
| 1 | TC7WH241FK | Package_SO:VSSOP-8_2.3x2mm_P0.5mm | U5 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J2 |
| 1 | XT60 | Connector_AMASS:AMASS_XT60-F_1x02_P7.20mm_Vertical | J1 |
The 42 most common of 46 parts.
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Questions
How big is the USB2DXL PCB?
It measures 33 × 46.4 mm and has 4 copper layers, 1.6 mm thick.
What parts does the USB2DXL use?
46 parts, built around the CH340E, SP485EEN-L/TR, 74AHC1G08GW and 78L05G-AB3-R. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the USB2DXL KiCad files?
From the koki0517/USB2RS485_TTL repository on GitHub, at the commit this page was made from: the board is USB2DXL/USB2DXL.kicad_pcb and its schematic USB2DXL/USB2DXL.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the USB2DXL design in my own project?
Its repository publishes it under the Apache-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).