---
title: "Apple's C1 modem process technology"
description: "Apple's C1 modem process technology:Baseband: 4/5nm (both technologies are similar) Low-frequency/Sub-6 TRx (Transceivers): 7nmIntermediate Frequency (IF) TRx: 7nmPMIC: 55nmThe C1 refreshed version is"
type: "topic"
locale: "en"
url: "https://longbridge.com/en/topics/100000000015491.md"
published_at: "2025-03-07T09:44:45.000Z"
author: "[Ming-Chi Kuo](https://longbridge.com/en/profiles/17087806)"
---

# Apple's C1 modem process technology

Apple's C1 modem process technology:

-   Baseband: 4/5nm (both technologies are similar)
-   Low-frequency/Sub-6 TRx (Transceivers): 7nm
-   Intermediate Frequency (IF) TRx: 7nm
-   PMIC: 55nm

The C1 refreshed version is under development for mass production next year, aiming to improve power consumption and transmission speed and support for mmWave (including TRx and front-end components, built on a 28nm process). While supporting mmWave isn't particularly challenging, achieving stable performance with low power consumption remains a key hurdle.

Unlike processors/GPUs, baseband chips don't aggressively adopt the latest advanced node because the return on investment isn't high. As a result, it's unlikely that Apple's baseband will shift to a 3nm process next year.

-   Advanced nodes don't significantly improve baseband transmission speeds.
-   While advanced nodes can improve baseband power efficiency, it's worth pointing out that the baseband is not the most power-consuming component in a mobile phone's wireless system.

### Related Stocks

- [AAPL.US - Apple](https://longbridge.com/en/quote/AAPL.US.md)

---

> **Disclaimer**: This article is for reference only and does not constitute any investment advice.