---
title: "The smallest Ethernet module in the world. C-Type Ethernet."
url: "https://maker.wiznet.io/Alan/projects/the-smallest-ethernet-module-in-the-world-c-type-ethernet/"
markdown_url: "https://maker.wiznet.io/Alan/projects/the-smallest-ethernet-module-in-the-world-c-type-ethernet/md"
type: "WCC: WIZnet Created Content"
author: "Alan"
author_url: "https://maker.wiznet.io/Alan/"
original_author: "alan"
published: "2024-11-18"
language: "en"
tags: ["W55RP20"]
hardware: ["WIZnet W55RP20"]
likes: 3
views: 9175
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# The smallest Ethernet module in the world. C-Type Ethernet.

> With USB-C Type, not only USB communication but also Ethernet!

Original author: alan

## Components

- **WIZnet W55RP20** x 1 ([docs](https://wiznet.io/products/ionic-chips/w55rp20))

## Article

The project I posted earlier has been completed.
The setup aims to use USB-C Type to enable Ethernet and USB 2.0 simultaneously. For more details, please refer to the link below.

[**It's time for the USB C Type Ethernet to be commercialized**](https://maker.wiznet.io/Alan/projects/its%2Dtime%2Dfor%2Dthe%2Dusb%2Dc%2Dtype%2Dethernet%2Dto%2Dbe%2Dcommercialized/)
![](https://maker.wiznet.io/upload/project/7969/cover197.jpg)
The main chip of this module is WIZnet's new chip, the W55RP20.
**This chip combines Raspberry Pi's RP2040 and WIZnet's W5500.** Think of it as adding Ethernet functionality to the RP2040. **This makes it perfect for small projects requiring Ethernet connectivity.**

It's now time to actually produce the board for which we previously worked on the artwork.
Here is the PCB, delivered as an array.

![](https://maker.wiznet.io/upload/ckeditor5/320698261%5F1731923087%2Epng)

There are many 0201-sized components, so assembly might be quite challenging. However, it's fortunate that the number of components is not too high.

![](https://maker.wiznet.io/upload/ckeditor5/320698261%5F1731923389%2Epng)

I’ve completed the assembly for now, and it was much harder than I expected.
I must have thought dozens of times that I’d never assemble 0201-sized components again.

![](https://maker.wiznet.io/upload/ckeditor5/320698261%5F1731923456%2Epng)

For now, it works perfectly. Both USB and Ethernet operate very stably at the same time.
While working on this design, I realized that DC-DC ICs have advanced significantly without me knowing... I was amazed that such small-sized DC-DC converters exist, and seeing them work so well in practice was truly fascinating.

![](https://maker.wiznet.io/upload/ckeditor5/320698261%5F1731923721%2Epng)
Even with this groundbreaking design, there is a problem.
While this module is designed to enable Ethernet through a USB-C Type connection, the other modules it communicates with are not. All Ethernet modules equipped with RJ-45 that we use operate based on their specific pinout. Therefore, the pinout of this module must be aligned with other Ethernet equipment.

For now, this requires using a JIG.

Of course, if a cable that adjusts the pinout can be made, such work will not be necessary.(As I did in the previous post.)

![](https://maker.wiznet.io/upload/ckeditor5/320698261%5F1731924038%2Epng)

I tested the Ethernet functionality using a tool called Hercules. The test was conducted with loopback firmware, and it worked flawlessly.

[Embedded media](https://www.youtube.com/embed/9W2vqJKWnNI)

---

Source: https://maker.wiznet.io/Alan/projects/the-smallest-ethernet-module-in-the-world-c-type-ethernet/