Adafruit
Adafruit ISO1540 Bidirectional I2C Isolator - STEMMA QT / Qwiic
$17.46
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The Adafruit ISO1540 Bidirectional I2C Isolator provides full electrical isolation between two sides of an I2C bus, using the TI ISO1540 chip with 2500 V-RMS...
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The Adafruit ISO1540 Bidirectional I2C Isolator provides full electrical isolation between two sides of an I2C bus, using the TI ISO1540 chip with 2500 V-RMS isolation. It's ideal for separating earth-grounded circuits, reducing noise, or protecting sensitive equipment in power monitoring setups.
Fully bidirectional with support for clock stretching and up to 1 MHz I2C clock rates, each side operates independently at 3V to 5.5V with its own power supply. STEMMA QT / Qwiic connectors on both sides allow solderless wiring, and green LEDs confirm power on each half.
Key Features
- 2500 V-RMS Isolation – Full galvanic isolation between I2C bus sides
- Bidirectional I2C – Transparent data transfer in both directions with clock stretching support
- Up to 1 MHz I2C Clock – Standard, fast, and fast-mode plus compatible
- 3V – 5.5V Per Side – Independent power and logic levels on each side
- ±50 kV/µs Transient Immunity – Protection against high-speed voltage transients
- −40°C to +125°C Operating Range – Industrial temperature rating
- STEMMA QT / Qwiic Connectors – One on each isolated side for solderless wiring
- 10 kΩ Pull-ups – Built-in on both sides, connected to their respective VCC
- Power LEDs – Green LED on each side confirms power is connected
Safety Certifications
- 4242 V-PK isolation per DIN VDE V 0884-11:2017-01
- 2500 V-RMS for 1 minute per UL 1577
- CSA approved per IEC 60950-1 and IEC 62368-1
- HBM ESD protection: 4 kV on all pins, 8 kV on bus pins
Ideal For
- Isolating earth-grounded equipment from microcontroller I2C buses
- Power monitoring systems requiring galvanic isolation
- Noise reduction on I2C buses in electrically noisy environments
- Safety-critical applications requiring certified isolation
Package Contents
- 1× Adafruit ISO1540 Bidirectional I2C Isolator Breakout
- 1× Header Strip
Note: Both sides must be independently powered for the isolator to function. STEMMA QT cables not included.
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- DIN
- DIN means data in, the pin where this display receives data from the controller. Connecting DIN to the correct SPI data output pin is needed for the screen to receive pixel and command information.
- ESD protection
- ESD protection helps protect electronics from damage caused by static electricity discharges. It is useful on development boards because cables, sensors and modules are often plugged and unplugged during prototyping.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- LED
- A light-emitting diode is a small electronic component that lights up when current flows through it in the correct direction. In this kit, LEDs create the flashing effect, so polarity and correct soldering matter for the project to work.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
- Qwiic
- Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
- RMS
- RMS is a way of describing the effective level of an AC signal, such as an audio output voltage. It helps compare audio output levels more meaningfully than a peak voltage number.
- STEMMA
- A plug-and-cable connection system used on some maker electronics boards to make wiring simpler. If a product uses STEMMA, you need the matching cable or connector type to plug it in without soldering.
- STEMMA QT
- A small plug-in connector system for I2C boards that lets you connect compatible sensors and controllers without soldering. It matters because it can make wiring faster and less error-prone, especially when adding several small modules to a project.
- UPS
- An uninterruptible power supply is a battery-backed power system that keeps a device running when external power is unplugged or fails. For an embedded computer, it helps prevent sudden shutdowns that can corrupt files or interrupt a project.
Related Tutorials
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