BCM4354 and BCM4356 are often mixed in the market. Although they are pin-to-pin compatible, they are not fully interchangeable in real use.
BCM4356XKUBG / CYW4356XKUBG – the official Wi-Fi + Bluetooth combo chip used by Nintendo across all Switch models, including:
- Switch V1 / HAC-001 (Erista)
- Switch V2 / HAC-001(-01) (Mariko)
- Switch Lite / HDH-001
- Switch OLED / HEG-001
Both model numbers refer to the exact same chip. The name difference comes from Broadcom’s Wi-Fi division being transferred to Cypress (now Infineon). Chips are shipped randomly based on stock availability – performance and compatibility are identical.
Technical Specifications:
| Parameter | Specification |
|---|---|
| Model | BCM4356XKUBG / CYW4356XKUBG |
| Type | Wi-Fi + Bluetooth 4.1 Combo Chip |
| Wi-Fi Standard | 802.11ac (2×2 MIMO) |
| Max Data Rate | Up to 867 Mbps |
| Package | BGA (Ball Grid Array) |
| Compatible With | Nintendo Switch All Models |
Important: Why BCM4354 Series Is Not Recommended as a Replacement
BCM4354 series chips (BCM4354KKUBG / BCM4354XKUBG / CYW4354XKUBG) are pin-compatible with the Switch motherboard and may physically function after installation. However, they are not the standard configuration used for the system.
Using BCM4354 as a replacement may lead to the following issues:
| Issue | Description |
|---|---|
| Wi-Fi Performance Degradation | BCM4354 supports only 1×1 MIMO, limiting Wi-Fi speed to 433 Mbps (vs. 867 Mbps on official BCM4356). |
| Bluetooth Instability in Dock Mode | Bluetooth may become unstable or disconnect when the console is docked. |
| Unpredictable Compatibility | System design is optimized for BCM4356; substitution may affect signal integrity, especially under higher load conditions (dock mode). |
| Potential for Intermittent Failures | Wireless functions may work in handheld mode but become unstable under stress or after system updates. |
We strongly recommend using only the official BCM4356 / CYW4356 series for reliable, long-term performance.
Installation Notes:
- Requires BGA rework experience. This chip is not a drop-in replacement and requires professional hot-air soldering or rework station.
- Check peripheral components. Before installation, inspect the capacitors and resistors around the Wi-Fi module on your motherboard – especially if 4354 Series was previously installed. Surrounding components may have been modified for compatibility. Missing or damaged components can cause Bluetooth or Wi-Fi failure, especially in docked mode.
- Test thoroughly after installation. We recommend testing both Wi-Fi (5GHz and 2.4GHz) and Bluetooth (pairing with controllers/headphones) in both handheld and docked modes to ensure full functionality.
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