2 layers
4 layers63.5 × 45 mm
St7701 adapter
metehus/home-dot- Size
- 63.5 × 45 mm
- Copper layers
- 4
- Thickness
- 1.58 mm
- Parts
- 72
- Nets
- 42
- Pads
- 197
- Tracks, vias
- 615, 281
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 14 Jun 2026
- Updated
- 25 Oct 2026
Overview
St7701 adapter is an open-source printed circuit board by metehus, from the metehus/home-dot repository on GitHub. It is a 4-layer board of 63.5 × 45 mm with 72 parts on 42 nets, routed with 615 tracks and 281 vias.
It is built around the SN74LVC1T45DBV, PCA9306D and TPS7A2018PDBVR-TP, with the AO3400A and BSS138 among its other parts. Its parts include 18 resistors, 17 capacitors, 5 ICs, 5 connectors and 2 transistors. It belongs with the interfaces and adapters boards of this library.
Main components
5
SN74LVC1T45DBV
SOT-23-6-40℃~+85℃ 1 1 1.65V~5.5V 1.65V~5.5V 420Mbps Bidirectional Tri-State SOT-23-6 Translators, Level Shifters ROHSTexas InstrumentsTranslators, Level Shifters
PCA9306D
SO-8-40℃~+105℃ 1 1.8V~5.5V 1V~3.6V 2 2Mbps Automatic direction detection、Output enable high-impedance Bidirectional Level translator Open-drain SMBus、I2C SO-8 Translators, Level Shifters ROHSNXP SemiconductorsTranslators, Level Shifters
TPS7A2018PDBVR-TP
SOT-23-5-40℃~+85℃ 1 1.8V 280uV@(300mA) 2uA 300mA 5.5V 75dB@(1kHz) Fixed Over Current Protection、Enable、Thermal Shutdown Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTECH PUBLICUncategorised
AO3400A
SOT-23-55℃~+150℃ 1 N-channel 1.45V 1.4W 30V 48mΩ@2.5V 5.7A 50pF 630pF 75pF 7nC@10V N-Channel SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETsBSS138
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
Parts
72| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 100nF | Capacitor_SMD:C_0805_2012Metric | C3, C5, C8, C10, C11, C13, C15, C17 |
| 8 | 1uF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C4, C7, C9, C12, C14, C16 |
| 4 | 10K | Resistor_SMD:R_0603_1608Metric | R3, R5, R8, R13 |
| 4 | 2.2K | Resistor_SMD:R_0603_1608Metric | R1, R2, R11, R12 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_2.2mm_M2_Pad | H1, H2, H3, H4 |
| 4 | SolderJumper | Jumper:SolderJumper-2_P1.3mm_Bridged2Bar_RoundedPad1.0x1.5mm | JP1, JP2, JP3, JP4 |
| 3 | 100K | Resistor_SMD:R_0603_1608Metric | R10, R15, R16 |
| 2 | 12K | Resistor_SMD:R_0603_1608Metric | R4, R6 |
| 2 | 22R | Resistor_SMD:R_0603_1608Metric | R9, R14 |
| 2 | LOGO | LOGO | G***, G*** |
| 2 | SN74LVC1T45DBV | Package_TO_SOT_SMD:SOT-23-6 | U3, U5 |
| 2 | TP_RST | TestPoint:TestPoint_Pad_D1.0mm | TP1, TP3 |
| 2 | TP_RST_1.8V | TestPoint:TestPoint_Pad_D1.0mm | TP2, TP4 |
| 1 | 100pF | Capacitor_SMD:C_0805_2012Metric | C6 |
| 1 | 200K | Resistor_SMD:R_0603_1608Metric | R7 |
| 1 | 5.1R | Resistor_SMD:R_0603_1608Metric | R17 |
| 1 | 65R | Resistor_SMD:R_0603_1608Metric | R18 |
| 1 | AO3400A | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | BL_VIN | TestPoint:TestPoint_Pad_D1.0mm | TP14 |
| 1 | BSS138 | Package_TO_SOT_SMD:SOT-23-3 | Q1 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | Conn_01x06 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J3 |
| 1 | Conn_01x15 | Connector_FFC-FPC:TE_1-84953-5_1x15-1MP_P1.0mm_Horizontal | J5 |
| 1 | Conn_01x30 | Connector_FFC-FPC:Hirose_FH12-30S-0.5SH_1x30-1MP_P0.50mm_Horizontal | J4 |
| 1 | IOVCC | TestPoint:TestPoint_Pad_D1.0mm | TP10 |
| 1 | LED | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | LED_ANODE | TestPoint:TestPoint_Pad_D1.0mm | TP13 |
| 1 | PCA9306 | Package_SO:SSOP-8_2.95x2.8mm_P0.65mm | U2 |
| 1 | PWM_1.8V | TestPoint:TestPoint_Pad_D1.0mm | TP5 |
| 1 | TE_1.8V | TestPoint:TestPoint_Pad_D1.0mm | TP8 |
| 1 | TLV70028_SOT353 | Package_TO_SOT_SMD:SOT-353_SC-70-5 | U1 |
| 1 | TPS7A2018PDBVR | Package_TO_SOT_SMD:SOT-23-5 | U4 |
| 1 | TP_INT | TestPoint:TestPoint_Pad_D1.0mm | TP7 |
| 1 | TP_INT_1.8V | TestPoint:TestPoint_Pad_D1.0mm | TP6 |
| 1 | TP_IOVCC | TestPoint:TestPoint_Pad_D1.0mm | TP12 |
| 1 | TP_VCI | TestPoint:TestPoint_Pad_D1.0mm | TP9 |
| 1 | VCI | TestPoint:TestPoint_Pad_D1.0mm | TP11 |
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Questions
How big is the St7701 adapter PCB?
It measures 63.5 × 45 mm and has 4 copper layers, 1.58 mm thick.
What parts does the St7701 adapter use?
72 parts, built around the SN74LVC1T45DBV, PCA9306D, TPS7A2018PDBVR-TP and AO3400A. 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 St7701 adapter KiCad files?
From the metehus/home-dot repository on GitHub, at the commit this page was made from: the board is hardware/kicad/prototypes/st7701-adapter/st7701_adapter.kicad_pcb and its schematic hardware/kicad/base-board/base-board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the St7701 adapter design in my own project?
Its repository states no licence, so its author keeps all rights: ask metehus before reusing the design.