2 layers353 × 151 mm
RF R1 8-9Xu
4pplet/RF_R1_8-9Xu
Open source universal PCB for the Realforce R1 family of keyboards.
215 parts2MIT
2 layers48 × 32.4 mm
I2c signal isolator
juarendra/Open-Embedded-BreakoutsCollection of open-source embedded breakout board designs (KiCad). I2C Signal Isolator, and more.
- Size
- 48 × 32.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 27
- Nets
- 14
- Pads
- 69
- Tracks, vias
- 132, 27
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.99 (file 20260513)
- Created
- 13 Sep 2026
- Updated
- 13 Sep 2026
Overview
I2c signal isolator is an open-source printed circuit board by juarendra, from the juarendra/Open-Embedded-Breakouts repository on GitHub. It is a 2-layer board of 48 × 32.4 mm with 27 parts on 14 nets, routed with 132 tracks and 27 vias.
It is built around the ME6206A33M3G, ADUM1250AR and BZV55B3V6, with the BLM18AG601SN1D among its other parts. Its parts include 10 capacitors, 6 resistors, 5 ICs, 3 diodes and 2 connectors. It belongs with the interfaces and adapters and microcontroller boards boards of this library.
Main components
4
ME6206A33M3G
SOT-23-3L-25℃~+85℃@(Ta) 1 3.3V 300mA 380mV@(200mA) 50dB@(1kHz) 6V 9uA Fixed Over Current Protection、Short Circuit Protection Positive SOT-23-3L Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMICRONEVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
ADUM1250AR
SOIC8Hot Swappable, Dual I2C IsolatorAnalog DevicesUncategorised
BZV55B3V6
LL-34(Mini-MELF)-65℃~+200℃ 1 Independent 2uA@1V 3.53V~3.67V 3.6V 500mW 600Ω 85Ω LL-34(Mini-MELF) Zener Diodes ROHSLGEZener Diodes
BLM18AG601SN1D
0603-55℃~+125℃ 1 380mΩ 500mA 600Ω@100MHz ±25% 0603 Ferrite Beads ROHSMurataFerrite Beads
README
README.mdOpen Embedded Breakouts
A collection of open-source embedded breakout board designs created with KiCad.
Boards
I2C Signal Isolator
Galvanically isolated I2C breakout board — provides full electrical isolation for I2C (SDA/SCL) communication between two systems operating on separate power domains.
Key Components:
| Component | Description |
|---|---|
| ADuM1250 | Hot-swappable, bidirectional I2C digital isolator (Analog Devices) |
| IF0505S-1WR3 | 5V-to-5V isolated DC-DC converter (1W) |
| ME6206A33M3G (×2) | 3.3V LDO voltage regulator for each isolated side |
| AO3401A | P-Channel MOSFET for power switching |
| BLM18AG601SN1D | Ferrite bead for power filtering |
Features:
- Full galvanic isolation (I2C signals + power)
- Isolated DC-DC power supply — no external isolated power needed
- 3.3V regulated output on both sides
- 4.7Ω series resistors on I2C lines for ESD/ringing protection
- 3.6V zener clamps on I2C lines
- Screw terminal connectors (KF168, 5.0mm pitch) for easy wiring
- Power LED indicator
- Compact 2-layer PCB
Connectors (J1, J2):
| Pin | Function |
|---|---|
| 1 | VCC (5V input / 3.3V regulated) |
| 2 | SDA |
| 3 | SCL |
| 4 | GND |
Directory Structure
├── i2c-signal-isolator/
│ ├── PCB/ # KiCad project files (.kicad_sch, .kicad_pcb, .kicad_pro)
│ ├── BOM/ # Bill of Materials
│ ├── CAD-CAM/ # Gerber files (development)
│ ├── CAD-CAM_Production/ # Gerber files (production-ready)
│ └── PDF/ # Schematic & PCB PDF exports
├── JLC2KiCad_lib/ # JLCPCB component library (shared)
└── README.mdTools
- EDA: KiCad 8+
- Component Library: Generated via JLC2KiCad_lib tool
Manufacturing
Production Gerber files are in <board>/CAD-CAM_Production/. The ZIP file inside is ready to upload directly to JLCPCB, PCBWay, or similar PCB fabrication services.
License
This project is open-source hardware. Feel free to use, modify, and manufacture these designs.
Parts
27| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 100nf | Capacitor_SMD:C_0603_1608Metric | C1, C3, C6, C7, C8, C9, C10, C11 |
| 4 | 4.7 | Resistor_SMD:R_0603_1608Metric | R11, R12, R13, R14 |
| 2 | BZV55B3V6 | Diode_SMD:D_MiniMELF | D1, D3 |
| 2 | Conn_01x04 | foorprint2:CONN-TH_KF168-5.0-4P | J1, J2 |
| 2 | ME6206A33M3G | Package_TO_SOT_SMD:SOT-23-3 | U2, U3 |
| 1 | 100k 1% | Resistor_SMD:R_0603_1608Metric | R10 |
| 1 | 10uf | Capacitor_SMD:C_0805_2012Metric | C5 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric | R7 |
| 1 | 4.7uf | Capacitor_SMD:C_0603_1608Metric | C4 |
| 1 | ADuM1250 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | AO3401A_C347476 | footprint:SOT-23_L2.9-W1.3-P1.90-LS2.4-BR | U7 |
| 1 | BLM18AG601SN1D | footprint:L0603 | L1 |
| 1 | IF0505S-1WR3_C5369637 | footprint:PWRM-TH_BXXXXLS-1W | U4 |
| 1 | LED | LED_SMD:LED_0805_2012Metric | D2 |
Questions
How big is the I2c signal isolator PCB?
It measures 48 × 32.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the I2c signal isolator use?
27 parts, built around the ME6206A33M3G, ADUM1250AR, BZV55B3V6 and BLM18AG601SN1D. 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 I2c signal isolator KiCad files?
From the juarendra/Open-Embedded-Breakouts repository on GitHub, at the commit this page was made from: the board is i2c-signal-isolator/PCB/i2c_signal_isolator.kicad_pcb and its schematic i2c-signal-isolator/PCB/i2c_signal_isolator.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the I2c signal isolator design in my own project?
Its repository states no licence, so its author keeps all rights: ask juarendra before reusing the design.
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