Chip vs Chip

ESP32-C6 vs EFR32BG22

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Side-by-side comparison of ESP32-C6 and EFR32BG22 BLE SoCs.

    
    

      
    

  


  
  
  

    
      

        A
        
ESP32-C6

      

      

    
    
      

        B
        
EFR32BG22

      

      

    
  

  

  
  

  






  
  

    
Overview


The ESP32-C6 and EFR32BG22 are both modern, energy-efficient BLE SoCs, but they occupy different capability tiers. Espressif's ESP32-C6 offers Wi-Fi 6, BLE 5.3, Thread, Zigbee, and Matter on a dual-core RISC-V at ~$2.50—a multiprotocol powerhouse for the smart home era. Silicon Labs' EFR32BG22 (Blue Gecko 22) is a BLE 5.2-only SoC on ARM Cortex-M33 at 38.4 MHz with Secure Vault Mid hardware security, targeting low-power BLE accessories, asset trackers, and medical-adjacent devices where hardware key storage and sub-1 µA sleep power are paramount.




Key Differences


    

  • Protocol coverage: ESP32-C6 offers Wi-Fi 6 + BLE 5.3 + Thread + Zigbee; EFR32BG22 offers BLE 5.2 only.
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  • BLE version: ESP32-C6 supports BLE 5.3 vs. BG22's BLE 5.2—ESP32-C6 gains enhanced ATT, connection subrating, and improved channel sounding.
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  • Wi-Fi: ESP32-C6 includes Wi-Fi 6; EFR32BG22 has no Wi-Fi.
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  • Thread/Zigbee/Matter: ESP32-C6 supports all three; EFR32BG22 has no 802.15.4 radio.
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  • Security: EFR32BG22 implements Secure Vault Mid with PUF-based hardware key storage, secure debug, anti-tamper; ESP32-C6 has flash encryption, secure boot, and Digital Signature but no hardware PUF key vault equivalent.
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  • Power: EFR32BG22 achieves ~1.1 µA deep sleep; ESP32-C6's LP core enables good low-power operation but the multiprotocol radio complexity means different power envelopes.
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  • Memory: ESP32-C6 has 512 KB SRAM + 4 MB flash; EFR32BG22 has 32 KB RAM + 352 KB flash—the C6 wins significantly on memory.
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  • Cost: EFR32BG22 is ~$1.50–2.50; ESP32-C6 is ~$2.50–3.50.
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Use Cases


Choose ESP32-C6 when:
- Smart home multiprotocol (Thread + Zigbee + BLE 5.3 + Wi-Fi 6 + Matter).
- Memory-intensive applications need 512 KB SRAM.
- ESP-IDF open-source ecosystem with Matter stack.


Choose EFR32BG22 when:
- BLE-only ultra-low-power accessories with hardware Secure Vault key storage.
- Medical or security-sensitive BLE devices requiring PUF-based key management.
- Silicon Labs' Simplicity Studio ecosystem is preferred.




Verdict


The ESP32-C6 wins on protocol breadth, memory, and multiprotocol smart home capability. The EFR32BG22 wins on hardware security (Secure Vault Mid PUF key storage) and BLE-only power optimization. Choose the C6 for multiprotocol smart home; choose the BG22 for security-sensitive, power-constrained BLE accessories.

  

  

  
  

  
  

    




  
Frequently Asked Questions


  

    
    

      
      

        
Our comparisons use verified datasheet specifications to create side-by-side tables. Each comparison includes a verdict explaining when to choose each option based on your project requirements.