The audio IC controls the speaker and microphone of the iPhone 7 and iPhone 7 Plus. It bears the markings U3402 and U3502, as well as the port designation 338S00220.
- Type: Audio IC
- Pin count: 42
- Compatibility: iPhone 6s, iPhone 7, iPhone 7 Plus, Nokia 7 Plus, A1660, A1661, A1778, A1779, A1780, A1784, A1785, A1786