4 layers87.5 × 129.5 mm
4 layers65 × 56 mm
Copilot Lite
BayLibre/Copilot22Manage a DUT power and serial through a single USB port, no additional software required.
- Size
- 65 × 56 mm
- Copper layers
- 4
- Thickness
- 1.57 mm
- Parts
- 80
- Nets
- 79
- Pads
- 348
- Tracks, vias
- 1,107, 403
- Pours
- 17
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 12 Jan 2026
- Updated
- 13 Oct 2026
Overview
Copilot Lite is an open-source printed circuit board by BayLibre, from the BayLibre/Copilot repository on GitHub, published under the MIT licence. It is a 4-layer board of 65 × 56 mm with 80 parts on 79 nets, routed with 1,107 tracks and 403 vias.
It is built around the SN74LV1T125DBV, FT230XS-R and LM74502DDF, with the BSS138 and BUK7M27-80EX among its other parts. Its parts include 24 resistors, 18 capacitors, 10 connectors, 9 ICs and 9 transistors.
Main components
5
SN74LV1T125DBV
SOT-23-5-40℃~+125℃ 1 1 1.6V~5.5V 10uA 5.5ns@5V,15pF 74LV 8mA 8mA Tri-State Unidirectional SOT-23-5 Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
FT230XS-R
SSOP-16-150mil-40℃~+85℃ 125uA 3.3V~5V 8mA USB 2.0 USB to UART SSOP-16-150mil USB Converters ROHSFTDIUSB Converters
LM74502DDF
TSOT-23-8-40℃~+125℃ 2Ω 3.2V~65V Active High High Side Switch Overvoltage protection、Under-voltage lockout、Reverse voltage protection、Integrated charge pump TSOT-23-8 Power Distribution Switches ROHSTexas InstrumentsPower Distribution Switches
BSS138
SOT-23-55℃~+150℃ 1 N-channel 1.1Ω@10V、1.2Ω@4.5V 1.2V 1.7nC@10V 17.5pF 340mA 350mW 50V 6.5pF N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETs
BUK7M27-80EX
LFPAK33-8-55℃~+175℃ 1 N-channel 1.306nF 19.5nC@10V 27mΩ@10V 30A 3V 62W 80V 89pF LFPAK33-8 MOSFETs ROHSNexperiaMOSFETs
README
README.rstCopilot
.. image:: doc/source/pictures/copilot_lite_top.jpg
Description
The user documentation is available in the doc folder.
The generated HTML pages can be viewed here <https://baylibre.github.io/Copilot/>_.
The board hardware files are in the Copilot_Lite/Hardware folder.
The FTDI chip is configured and serialized by the Serialization software located in the Copilot_Lite/Software folder.
The boards serialization and test procedure is described in the Copilot_Lite/Factory_Testing.md file.
Extension boards
The Copilot Lite board features some extension boards to be connected on top, like an Arduino Shield or a Raspberry Pi Hat.
More than one extension board can be stacked on top of the Copilot Lite master board, according to the needs.
3x USB 2.0 channels <https://github.com/BayLibre/Copilot-extension-triple-usb-2.0>_, the Copilot Lite GPIOs can drive the channels power.3x signal relays <https://github.com/BayLibre/Copilot_Extension_Triple_Relays>_, the Copilot Lite GPIOs can close or open each relay.
Parts
80| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 10K | Resistor_SMD:R_0603_1608Metric | R2, R9, R12, R13, R18, R21, R24 |
| 7 | BSS138 | Package_TO_SOT_SMD:SOT-23 | Q1, Q4, Q5, Q6, Q7, Q8, Q9 |
| 6 | 100n | Capacitor_SMD:C_0603_1608Metric | C11, C12, C14, C17, C18, C19 |
| 5 | 240 | Resistor_SMD:R_1206_3216Metric | R1, R4, R10, R17, R22 |
| 4 | 2.2u | Capacitor_SMD:C_0603_1608Metric | C8, C9, C13, C16 |
| 4 | MountingHole | MountingHole:MountingHole_2.7mm | H1, H2, H3, H4 |
| 4 | SN74LV1T125 | Package_TO_SOT_SMD:SOT-23-5 | U6, U7, U8, U9 |
| 3 | 100K | Resistor_SMD:R_0603_1608Metric | R11, R20, R23 |
| 2 | 100K | Resistor_SMD:R_0805_2012Metric | R5, R7 |
| 2 | 100n | Capacitor_SMD:C_0805_2012Metric | C1, C2 |
| 2 | 1u | Capacitor_SMD:C_0603_1608Metric | C5, C10 |
| 2 | 2.4K | Resistor_SMD:R_0805_2012Metric | R6, R8 |
| 2 | 220n | Capacitor_SMD:C_0805_2012Metric | C3, C4 |
| 2 | 27 | Resistor_SMD:R_0603_1608Metric | R15, R16 |
| 2 | 47p | Capacitor_SMD:C_0603_1608Metric | C6, C7 |
| 2 | AP2204K-ADJ | Package_TO_SOT_SMD:SOT-23-5 | U3, U4 |
| 2 | BUK7M27-80EX | Package_TO_SOT_SMD:LFPAK33 | Q2, Q3 |
| 2 | LM74502 | Package_TO_SOT_SMD:SOT-23-8 | U1, U2 |
| 1 | 22K | Resistor_SMD:R_0603_1608Metric | R14 |
| 1 | 5.1K | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 5V_ENABLE | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Horizontal | J6 |
| 1 | 6.04K | Resistor_SMD:R_0603_1608Metric | R19 |
| 1 | FT230XS | Package_SO:SSOP-16_3.9x4.9mm_P0.635mm | U5 |
| 1 | JACK_POWER | LED_SMD:LED_0805_2012Metric | D1 |
| 1 | JACK_POWER_IN | PJ-082BH:JACK-C-PC-10A-RA(R) | J2 |
| 1 | JACK_POWER_OUT | PJ-082BH:JACK-C-PC-10A-RA(R) | J8 |
| 1 | LOGO | Logo_BayLibre:Logo_BayLibre | G*** |
| 1 | PC_USB | LED_SMD:LED_0805_2012Metric | D2 |
| 1 | POWER_MODES | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Horizontal | J1 |
| 1 | SERIAL_AND_GPIO | Connector_PinHeader_2.54mm:PinHeader_2x06_P2.54mm_Horizontal | J7 |
| 1 | SERIAL_MODE | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Horizontal | J11 |
| 1 | SERIAL_VOLTAGE_SELECT | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Horizontal | J12 |
| 1 | UART_RX | LED_SMD:LED_0805_2012Metric | D5 |
| 1 | UART_TX | LED_SMD:LED_0805_2012Metric | D4 |
| 1 | USB_PC | USB4081:USB4081-03-A | J4 |
| 1 | USB_POWER | LED_SMD:LED_0805_2012Metric | D3 |
| 1 | USB_POWER_IN | USB4081:USB4081-03-A | J3 |
| 1 | USB_POWER_OUT | USB4081:USB4081-03-A | J9 |
Questions
How big is the Copilot Lite PCB?
It measures 65 × 56 mm and has 4 copper layers, 1.57 mm thick.
What parts does the Copilot Lite use?
80 parts, built around the SN74LV1T125DBV, FT230XS-R, LM74502DDF and BSS138. 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 Copilot Lite KiCad files?
From the BayLibre/Copilot repository on GitHub, at the commit this page was made from: the board is Copilot_Lite/Hardware/Copilot_Lite.kicad_pcb and its schematic Copilot_Lite/Hardware/Controller.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Copilot Lite design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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