From iconfinder.com:
Material Code by Google - https://www.iconfinder.com/iconsets/material-core - Free for commercial use
Hawcons by Yannick Lung - https://www.iconfinder.com/iconsets/hawcons - Free for commercial use (Do not redistribute)

From http://www.clker.com/:
INTEGRATED CIRCUIT CHIP CLIP ART - http://www.clker.com/clipart-15226.html - CC0 1.0 Universal (CC0 1.0) Public Domain Dedication

