4 layers50 × 100 mm
4 layers36.3 × 38 mm
Ltwoo pcb
dmitrodem/ltwoo_pcbLTWOO ERX/ER9 Rear Derailleur PCB
- Size
- 36.3 × 38 mm
- Copper layers
- 4
- Thickness
- 1 mm
- Parts
- 113
- Nets
- 82
- Pads
- 364
- Tracks, vias
- 675, 143
- Pours
- 11
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 31 Aug 2025
- Updated
- 31 Aug 2025
Overview
Ltwoo pcb is an open-source printed circuit board by dmitrodem, from the dmitrodem/ltwoo_pcb repository on GitHub. It is a 4-layer board of 36.3 × 38 mm with 113 parts on 82 nets, routed with 675 tracks and 143 vias.
It is built around the SI24R1, DRV8833PWP and MP2338GTL-Z, with the MT6701CT-STD, KX022-1020 and SPX3819M5-L-3-3 among its other parts. Its parts include 51 capacitors, 18 resistors, 12 diodes, 10 ICs and 9 inductors. It belongs with the nRF52 and nRF5x boards of this library.
Main components
6
SI24R1
QFN-20-EP(4x4)-40℃~+85℃ -96dBm 1.9V~3.6V 12mA 15mA 2.4GHz 2.4GHz~2.525GHz 2Mbps 7dBm ISM SPI Supports RSSI function、CRC check function、Automatic response function、Automatic retransmission function transceiver QFN-20-EP(4x4) RF Transceiver ICs ROHS南京中科微RF Transceiver ICs
DRV8833PWP
ETSSOP-16-EP-40℃~+85℃ 1.5A 2 2.7V~10.8V 2.7V~10.8V 360mΩ Bipolar Driver Overcurrent Protection、Short-Circuit Protection、Over temperature protection、Under-voltage lockout、Dead-time / shoot-through protection Yes ETSSOP-16-EP Stepper Motor Driver ROHSTexas InstrumentsStepper Motor Driver
MP2338GTL-Z
SOT-583-40℃~+125℃ 1 160uA 3A 4.5V~28V 450kHz 500mV~16V Adjustable Buck Buck Built-in Yes SOT-583 DC-DC Converters ROHSMonolithic Power SystemsDC-DC Converters
MT6701CT-STD
SOP-8-40℃~+125℃ 0°~360° 1.75mm 10mA 3.3V~5V 3.9mm 5mm I2C、SSI Magnetic rotary position sensor No Programmable transmission、Zero position programming、Multi-axis magnetic field detection SOP-8 Position Sensors ROHSNOVOSENSEPosition Sensors
KX022-1020
LGA-12(2x2)-40℃~+85℃ 1.71V~3.6V 16bit 900nA Accelerometer SPI、I2C X,Y,Z ±8g LGA-12(2x2) Accelerometers ROHSROHM SemiconductorAccelerometers
SPX3819M5-L-3-3
SOT-23-5-40℃~+85℃@(Ta) 1 20V 3.3V 420mV@(100mA) 500mA 5uA 70dB@(1kHz) Fixed Over Current Protection、Over Temperature Protection、Enable Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTECH PUBLICVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
Parts
113| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | 100n | Capacitor_SMD:C_0402_1005Metric | C4, C6, C20, C21, C25, C26, C27, C30, C36, C44, C50 |
| 10 | 1u | Capacitor_SMD:C_0402_1005Metric | C3, C8, C16, C28, C31, C37, C45, C48, C70, C71 |
| 9 | D_Small | Diode_SMD:D_0402_1005Metric | D3, D5, D6, D10, D11, D12, D13, D14, D15 |
| 7 | 4.7k | Resistor_SMD:R_0402_1005Metric | R7, R8, R9, R10, R21, R27, R28 |
| 4 | 2.2u | Capacitor_SMD:C_0402_1005Metric | C19, C23, C35, C49 |
| 4 | C_Small | Capacitor_SMD:C_0402_1005Metric | C11, C13, C14, C34 |
| 4 | MountingHole | ltwoo_pcb:MountingHole_2.0mm | H1, H2, H3, H4 |
| 3 | L_Small | ltwoo_pcb:L_0402_1005Metric | L5, L8, L9 |
| 2 | 100u | ltwoo_pcb:C_1210_3225Metric | C2, C51 |
| 2 | 10n | Capacitor_SMD:C_0402_1005Metric | C22, C29 |
| 2 | 14p | Capacitor_SMD:C_0402_1005Metric | C41, C42 |
| 2 | 18p | Capacitor_SMD:C_0402_1005Metric | C39, C40 |
| 2 | 1n | Capacitor_SMD:C_0402_1005Metric | C9, C47 |
| 2 | 300k | Resistor_SMD:R_0402_1005Metric | R3, R12 |
| 2 | 590k | Resistor_SMD:R_0402_1005Metric | R1, R11 |
| 2 | Antenna_Chip | ltwoo_pcb:Antenna_Chip | E1, E2 |
| 1 | 0.05R | ltwoo_pcb:R_1206_3216Metric | R15 |
| 1 | 1.5p | Capacitor_SMD:C_0402_1005Metric | C15 |
| 1 | 100k | Resistor_SMD:R_0402_1005Metric | R6 |
| 1 | 100p | Capacitor_SMD:C_0402_1005Metric | C32 |
| 1 | 100u | Capacitor_SMD:C_1210_3225Metric | C17 |
| 1 | 10k | Resistor_SMD:R_0402_1005Metric | R13 |
| 1 | 10uH | Inductor_SMD:L_0603_1608Metric | L6 |
| 1 | 15nH | Inductor_SMD:L_0402_1005Metric | L7 |
| 1 | 16MHz | ltwoo_pcb:Crystal_SMD_TXC_7M-4Pin_3.2x2.5mm | G1 |
| 1 | 1p | Capacitor_SMD:C_0402_1005Metric | C46 |
| 1 | 2.2n | Capacitor_SMD:C_0402_1005Metric | C10 |
| 1 | 2.7nH | Inductor_SMD:L_0402_1005Metric | L2 |
| 1 | 200k | Resistor_SMD:R_0402_1005Metric | R4 |
| 1 | 22k 1% | Resistor_SMD:R_0402_1005Metric | R2 |
| 1 | 22n | Capacitor_SMD:C_0402_1005Metric | C33 |
| 1 | 22u | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | 22u | Capacitor_SMD:C_0402_1005Metric | C24 |
| 1 | 24AA02-OT | ltwoo_pcb:SOT-23-5 | U7 |
| 1 | 3.9nH | Inductor_SMD:L_0402_1005Metric | L3 |
| 1 | 32MHz | ltwoo_pcb:Crystal_SMD_TXC_7M-4Pin_3.2x2.5mm | G2 |
| 1 | 33n | Capacitor_SMD:C_0402_1005Metric | C5 |
| 1 | 36k | Resistor_SMD:R_0402_1005Metric | R5 |
| 1 | 4.7p | Capacitor_SMD:C_0402_1005Metric | C12 |
| 1 | 470p | Capacitor_SMD:C_0402_1005Metric | C18 |
| 1 | 47u | ltwoo_pcb:C_1206_3216Metric | C38 |
| 1 | 6.8nH | ltwoo_pcb:L_Switching | L1 |
| 1 | 8.2nH | Inductor_SMD:L_0402_1005Metric | L4 |
| 1 | Conn_01x02 | ltwoo_pcb:Connector_Charger | CN2 |
| 1 | Conn_01x02 | ltwoo_pcb:MotorConnector_1x02 | J1 |
| 1 | Conn_01x04 | ltwoo_pcb:DBG_1x04_P1.27mm | CN1 |
| 1 | Conn_01x04 | ltwoo_pcb:Connector_Front_Derailleur | CN3 |
| 1 | DRV8833PWP | ltwoo_pcb:HTSSOP-16-1EP_4.4x5mm_P0.65mm_EP3.4x5mm_Mask2.46x2.31mm_ThermalVias | IC2 |
| 1 | D_Schottky_Small | ltwoo_pcb:D_SOD-123 | D1 |
| 1 | D_Small | ltwoo_pcb:D_1610Metric | D16 |
| 1 | KX022-1020 | ltwoo_pcb:LGA-12_2x2mm_P0.5mm | U4 |
| 1 | LED_Dual_KAKA | ltwoo_pcb:LED_Dual | LED2 |
| 1 | MP2338GTL | ltwoo_pcb:SOT-583-8 | U8 |
| 1 | MT6701CT | ltwoo_pcb:SO-8_3.9x4.9mm_P1.27mm | U6 |
| 1 | SGM8199 | ltwoo_pcb:SOT-363_SC-70-6 | U9 |
| 1 | SPX3819M5-L-3-3 | ltwoo_pcb:SOT-23-5 | U3 |
| 1 | SW_Push | Button_Switch_SMD:SW_Push_1P1T_XKB_TS-1187A | SW1 |
| 1 | Si24R1 | ltwoo_pcb:QFN-20-1EP_4x4mm_P0.5mm_EP2.6x2.6mm | U1 |
| 1 | XC6206PxxxMR | ltwoo_pcb:SOT-23-3 | U5 |
| 1 | inf | Resistor_SMD:R_0603_1608Metric | R30 |
| 1 | nRF52832-QFxx | ltwoo_pcb:QFN-48-1EP_6x6mm_P0.4mm_EP4.6x4.6mm | IC1 |
Questions
How big is the Ltwoo pcb PCB?
It measures 36.3 × 38 mm and has 4 copper layers, 1 mm thick.
What parts does the Ltwoo pcb use?
113 parts, built around the SI24R1, DRV8833PWP, MP2338GTL-Z and MT6701CT-STD. 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 Ltwoo pcb KiCad files?
From the dmitrodem/ltwoo_pcb repository on GitHub, at the commit this page was made from: the board is ltwoo_pcb.kicad_pcb and its schematic ltwoo_pcb.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Ltwoo pcb design in my own project?
Its repository states no licence, so its author keeps all rights: ask dmitrodem before reusing the design.
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