---
product_id: 431924953
title: "LTC4311 I2C Extender/Active Terminator - Stemma QT/Qwiic Adafruit"
brand: "adafruit"
price: "€ 0.74"
currency: EUR
in_stock: false
reviews_count: 5
url: https://www.desertcart.hr/products/431924953-ltc4311-i2c-extender-active-terminator-stemma-qt-qwiic-adafruit
store_origin: HR
region: Croatia
---

# 1.6V-5.5V wide voltage range Supports cables up to 4000pF capacitance Up to 400 KHz I2C speed LTC4311 I2C Extender/Active Terminator - Stemma QT/Qwiic Adafruit

**Brand:** adafruit
**Price:** € 0.74
**Availability:** ❌ Out of Stock

## Summary

> ⚡ Power your I2C bus with flawless speed and signal clarity!

## Quick Answers

- **What is this?** LTC4311 I2C Extender/Active Terminator - Stemma QT/Qwiic Adafruit by adafruit
- **How much does it cost?** € 0.74 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/431924953-ltc4311-i2c-extender-active-terminator-stemma-qt-qwiic-adafruit)

## Best For

- adafruit enthusiasts

## Why This Product

- Trusted adafruit brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Plug & Play Simplicity:** No firmware or software tweaks needed—just connect and elevate your signal quality.
- • **High-Speed Data Transfer:** Boost your I2C bus speed up to 400 KHz for lightning-fast communication.
- • **Multi-Device Reliability:** Maintain data integrity across multiple devices on your I2C bus without compromise.
- • **Enhanced Signal Integrity:** Transforms noisy sawtooth signals into clean square waves for flawless data transmission.
- • **Universal Voltage Compatibility:** Seamlessly operates from 1.6V to 5.5V, fitting any modern I2C setup.

## Overview

The LTC4311 I2C Extender/Active Terminator from Adafruit supports a wide voltage range (1.6V to 5.5V) and high-speed I2C communication up to 400 KHz. It enables long cable runs up to 4000pF capacitance without requiring special firmware or configuration, ensuring clean, reliable data signals and robust multi-device bus integrity.

## Description

I2C stands for Inter-Integrated-Circuit communications, it's meant for short distances on a PCB or subassembly. But, hey, we're engineers, and we like to push the limits of technology, right? So why not try to have I2C run over a meter long cable, or even longer? Well, if you try to do that you'll quickly find that the length of the cable adds capacitance and resistance that slows down the open-drain pullups used in I2C, making it hard to use 100KHz+ clock speeds. You could try slowing down your I2C clock to 1 KHz...or you could use an Adafruit LTC4311 active terminator like this one! Using this board is easy: connect it to your I2C bus at the beginning of the chain (if you don't have a massively long cable, you can also try at the end of the chain). When the chip is powered and enabled, it will watch the SCL and SDA lines. When it sees them being pulled up through the I2C resistors, it will activate and dump in some current to give it a boost thru to the top power rail. You can now achieve much faster data rates without having to noodle with resistors, and over long cables. We ran a 400 KHz OLED over 3 meters of phone wire with ease. With a 100KHz signal, we even ran a BME680 over 100 feet of Ethernet (about 3000pF round trip!), and had an OLED display the sensor details. Runs with any bus voltage, from 1.6V to 5.5V and up to 400 KHz SCL speed, with cables up to 4000pF. No special firmware, software, or configuration required. Simply plug the power, ground, SCL and SDA connectors into your bus and watch as your rise times magically turn sawtooths into square waves. To get you going fast, we spun up a custom made PCB in the STEMMA QT form factor, making it easy to interface with. The STEMMA QT connectors on either side are compatible with the SparkFun Qwiic I2C connectors. This allows you to make solderless connections between your development board and the LTC4311 or to chain it with a wide range of other sensors and accessories using a compatible cable

## Features

- Runs with any bus voltage, from 1.6V to 5.5V and up to 400 KHz SCL speed, with cables up to 4000pF
- o special firmware, software, or configuration required
- Simply plug the power, ground, SCL and SDA connectors into your bus and watch as your rise times magically turn sawtooths into square waves
- Ensures Data Integrity with Multiple Devices on the I2C Bus.
- Wide Supply Voltage Range: 1.6V to 5.5V

## Images

![LTC4311 I2C Extender/Active Terminator - Stemma QT/Qwiic Adafruit - Image 1](https://m.media-amazon.com/images/I/71QOzAH7VuL.jpg)
![LTC4311 I2C Extender/Active Terminator - Stemma QT/Qwiic Adafruit - Image 2](https://m.media-amazon.com/images/I/81wdq44XdIL.jpg)
![LTC4311 I2C Extender/Active Terminator - Stemma QT/Qwiic Adafruit - Image 3](https://m.media-amazon.com/images/I/61F+alUxGhL.jpg)
![LTC4311 I2C Extender/Active Terminator - Stemma QT/Qwiic Adafruit - Image 4](https://m.media-amazon.com/images/I/812itVyo61L.jpg)
![LTC4311 I2C Extender/Active Terminator - Stemma QT/Qwiic Adafruit - Image 5](https://m.media-amazon.com/images/I/81Cn07Cn6RL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Worked well to improve my I2C signals
*by L***T on May 11, 2024*

The i2C signals improved from 3V to 4.5V and had a good stability during the clock. It allowed a 10 harness to use I2C.

### ⭐⭐⭐⭐ It does work.
*by W***T on August 11, 2024*

Is the absolute answer, not really. While it has allowed me to run long distance cables for about 12 feet using paired audio cable, to run longer distance I had to resort to using RG6 coax cables. That in itself might not be a big deal as long as the cables aren't needed to be flexible or small. Trying to emulate the cabling on the Adafruit site didn't yield the same results as what the had shown.But in the end I would recommend using these as they have allowed me to use I2C connections a lot further than without the addition. And it's like anything else in electronics, adapt with what you got.

### ⭐⭐⭐⭐⭐ These work great!
*by S***S on March 31, 2024*

I'm impressed. The current project using a Pico to read an RM3100 sensor on about 30 feet (not inches) of CAT5 cable. The LTC4311 works as advertised and I like Adafruit's breadboard friendly design. Perfect for prototyping, suitable for a build. I'm going to order a couple more of these things

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-03-12*