4 layers40 × 40 mm
4 layers50 × 75 mm
FTDIboard
sneakylizard123-4/FTDIboardFTDIboard is a small USB-to-UART interface that uses the FT232RL and a switchable 3.3V/5V logic rail.
- Size
- 50 × 75 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 69
- Nets
- 56
- Pads
- 194
- Tracks, vias
- 414, 79
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 19 Jun 2026
- Updated
- 15 Oct 2026
Overview
FTDIboard is an open-source printed circuit board by sneakylizard123-4, from the sneakylizard123-4/FTDIboard repository on GitHub. It is a 4-layer board of 50 × 75 mm with 69 parts on 56 nets, routed with 414 tracks and 79 vias.
It is built around the FT232RL, TLV75733PDBV and USBLC6-2SC6, with the BC817 and AO3401A among its other parts. Its parts include 25 resistors, 13 diodes, 10 capacitors, 3 ICs and 3 transistors.
Main components
5
FT232RL
SSOP-28-208mil-40℃~+85℃ 3.3V~5.25V、4V~5.25V USB 2.0 USB to UART SSOP-28-208mil USB Converters ROHSFTDIUSB Converters
TLV75733PDBV
SOT-23-5-40℃~+125℃@(Tj) 1 1A 3.3V 40uA 46dB@(100kHz) 5.5V 650mV@(1A) 71.5uVrms Fixed Positive Under Voltage Lockout、Over Current Protection、Over Temperature Protection、Soft Start SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
BC817
SOT-231 NPN 100nA 150MHz 300mW 40 45V 500mA 5V 700mV NPN SOT-23 Bipolar (BJT) ROHSShikuesBipolar (BJT)AO3401A
SOT-231 P-Channel 14nC@10V 30V 47mΩ@10V、60mΩ@4.5V、85mΩ@2.5V 4A 55pF 645pF 80pF 900mV SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
README
README.mdFTDIboard
FTDIboard is a small USB-to-UART interface that uses the FT232RL and a switchable 3.3V/5V logic rail.
Key Features
- FT232RL USB-to-UART bridge
- Switchable 3.3V / 5V logic levels
- ESP-style auto-reset
- USB ESD protection
- Resettable Fuse (PPTC): 600mA on VBUS
- Fuse (not resettable): 2.5A fast fuse
- Lots of LEDs
- 75×50mm, 4-layer PCB
- M3 mounting holes
- 2.54mm standard headers
Bill of Materials
| References | Qty | Value | Footprint |
|---|---|---|---|
| U3 | 1 | FT232RL | SSOP-28 |
| U2 | 1 | TLV75733PDBV | SOT-23-5 |
| U1 | 1 | USBLC6-2SC6 | SOT-23-6 |
| C1 C4 C5 C7 C8 C10 | 6 | 100nF | 0805 |
| C6 C9 | 2 | 4.7uF | 0805 |
| C2 | 1 | 10uF | 0805 |
| C3 | 1 | 22uF | 0805 |
| R4 R10 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 | 16 | 10k | 0805 |
| R7 R8 R9 R11 | 4 | 1k | 0805 |
| R3 | 1 | 100k | 0805 |
| R1 R2 | 2 | 5.1k | 0805 |
| R5 R6 | 2 | 33R | 0805 |
| Q2 Q3 | 2 | BC817 | SOT-23 |
| Q1 | 1 | AO3401A | SOT-23 |
| D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 | 13 | LED | 0805 LED |
| J3 | 1 | Conn_01x04 | 1x4 Header 2.54mm |
| J2 | 1 | Conn_01x07 | 1x7 Header 2.54mm |
| J1 | 1 | USB_C_Receptacle_USB2.0_14P | USB-C Receptacle |
| F1 | 1 | 600mA hold, 1.2A trip | Disc 5.1mm |
| F2 | 1 | 2.5A trip | 0603 |
| SW1 | 1 | SW_SPDT_321 | SPDT Slide switch |
Full BOM available in BOM.csv
Usage
- Connect via USB
- Install FTDI VCP drivers if needed
- Select serial port in your IDE
- Have fun
Images
PCB Layout
Schematic
3D Model
Testing
v1.1 board built and tested, self-loopback passes clean. the two v1.0 bugbear fixes (auto-reset latch, VCCIO following the switch) are confirmed gone in this revision.
- v1.1 build + test proof:
proof/V1-1/PROOF.md - v1.0 electrical soundness proof:
proof/V1/PROOF.md
Parts
69| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4, R10, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24, R25 |
| 13 | LED | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13 |
| 6 | 100nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C4, C5, C7, C8, C10 |
| 4 | 1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7, R8, R9, R11 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 2 | 33R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5, R6 |
| 2 | 4.7uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C6, C9 |
| 2 | 5.1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2 |
| 2 | BC817 | Package_TO_SOT_SMD:SOT-23 | Q2, Q3 |
| 2 | SolderJumper_2_Bridged | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP1, JP2 |
| 1 | 100k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2 |
| 1 | 2.5A | Fuse_US_Handsoldering_AKL:Fuse_0603_1608Metric | F2 |
| 1 | 22uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3 |
| 1 | 600mA hold, 1.2A trip | Capacitor_THT:C_Disc_D5.1mm_W3.2mm_P5.00mm | F1 |
| 1 | AO3401A | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J3 |
| 1 | Conn_01x07 | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | J2 |
| 1 | FT232RL | Package_SO:SSOP-28_5.3x10.2mm_P0.65mm | U3 |
| 1 | LOGO | customimages:moon | G*** |
| 1 | LOGO | customimages:linuxpenguin-mask | G*** |
| 1 | LOGO | customimages:linuxpenguin_cu | G*** |
| 1 | SW_SPDT_321 | Button_Switch_THT:SW_Slide_SPDT_Straight_CK_OS102011MS2Q | SW1 |
| 1 | TLV75733PDBV | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U1 |
| 1 | USB_C_Receptacle_USB2.0_14P | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
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Questions
How big is the FTDIboard PCB?
It measures 50 × 75 mm and has 4 copper layers, 1.6 mm thick.
What parts does the FTDIboard use?
69 parts, built around the FT232RL, TLV75733PDBV, USBLC6-2SC6 and BC817. 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 FTDIboard KiCad files?
From the sneakylizard123-4/FTDIboard repository on GitHub, at the commit this page was made from: the board is kicad/FTDIboard.kicad_pcb and its schematic kicad/FTDIboard.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the FTDIboard design in my own project?
Its repository states no licence, so its author keeps all rights: ask sneakylizard123-4 before reusing the design.