ET-C07
Isolated I²C Bridge
2.5 kV isolation between your MCU and an I²C device
AED 25.00
Out of stockOverview
2.5 kV isolation between your MCU and an I²C device
The ET-C07 is built around the TI ISO1540 — bidirectional I²C isolation, 2500Vrms, up to 1MHz, 50kV/µs CMTI.
Two Qwiic / STEMMA QT connectors let you chain it with other boards without soldering, and the 2.54 mm header fits a breadboard.
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- Sensors on motors and drives
- Battery-stack monitoring
- Breaking ground loops
Key features
What makes it different
Isolator
TI ISO1540: bidirectional I²C isolation, 2500Vrms, up to 1MHz, 50kV/µs CMTI
Sides
Host: Qwiic/STEMMA QT, 3.0–5.5V. Isolated: VCC2 3.0–5.5V supplied by the remote circuit (or an isolated DC-DC)
Use
Breaking ground loops to sensors on motors, mains-powered rigs, battery stacks
Qwiic / STEMMA QT
Two JST-SH connectors plus a 2.54 mm header — 3.3 V and 5 V hosts.
Open documentation
Schematic, BOM and layout notes published for every board.
Breadboard friendly
Standard 2.54 mm pitch and M2.5 mounting holes.
Specifications
Technical specifications
| Isolator | TI ISO1540: bidirectional I²C isolation, 2500Vrms, up to 1MHz, 50kV/µs CMTI |
|---|---|
| Sides | Host: Qwiic/STEMMA QT, 3.0–5.5V. Isolated: VCC2 3.0–5.5V supplied by the remote circuit (or an isolated DC-DC) |
| Use | Breaking ground loops to sensors on motors, mains-powered rigs, battery stacks |
| Size | 38.1 × 25.4 mm |
|---|---|
| Mounting | 4 × M2.5 holes, 2.54 mm from each corner |
| Connectors | 2 × Qwiic / STEMMA QT (JST SH 4-pin) · 4-pin 2.54 mm header |
| Main IC | ISO1540DR (LCSC C179739) |
| Revision | Rev A |
| JP1 (default Closed) | Power LED |
|---|---|
| JP2 (default Closed) | Host-side pull-ups |
Performance
Bus speeds
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VIN | Power | Host side 3.0–5.5V |
| 2 | GND | Ground | Host ground |
| 3 | SCL | I²C | I²C clock |
| 4 | SDA | I²C | I²C data |
Qwiic / STEMMA QT pins: GND, VIN, SDA, SCL (same on both connectors). I²C pull-ups (10 kΩ) are on the board; cut JP2 to remove them.
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-C07 Isolated I²C Bridge (assembled)
- 1 × 4-pin 2.54 mm male header, unsoldered
Getting started
- Plug in a Qwiic / STEMMA QT cable, or solder the header and wire VIN, GND, SDA and SCL
Compare
Which isolation board?
| Isolated I²C Bridge (this board)This board | ET-C08 4-Channel Opto-Isolated Input | |
|---|---|---|
| What it does | 2.5 kV isolation between your MCU and an I²C device | Read 12–24 V machine signals safely at 3.3/5 V |
| Interface | — | 12–24V DC (on ≥ 9V, off ≤ 3V), ~2.4mA at 24V;… |
| Best for | Sensors on motors and drives | PLC-style sensors and limit switches |
| Price | 25 AED | 11 AED |
Downloads
Documents and design files
Need a custom version of this board?
Different connector, size or sensor? We design and build custom variants.