---
title: "W6100 - 5V I/O signal tolerance"
url: "https://maker.wiznet.io/forum/13596"
markdown_url: "https://maker.wiznet.io/forum/13596/md"
type: "Forum topic"
category: "Ethernet Chips"
author: "brambo123"
created: "2019-12-05T14:56:17+09:00"
last_activity: "2019-12-05T15:25:09+09:00"
language: "en"
views: 431
replies: 1
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# W6100 - 5V I/O signal tolerance

## Question

Asked by brambo123 on 2019-12-05 in Ethernet Chips.

In the datasheet it says on page 3:
3V operation with 5V I/O signal tolerance

But in the table with Absolute Maximum ratings:
DC input voltage: -0.5 to 4.6 V

What is the actual maximum voltage for io pins??

## Replies

### Reply 1 by Eugeny, 2019-12-05

I used W5100 in the 5V I/O environment. It was total failure. While chip did not fry, its timing (due to capacitances and overcharging) was inadequate. If you have an option, do not use these chips in 5V I/O environment.

---

Source: https://maker.wiznet.io/forum/13596