Chip vs Chip

EFR32MG24 vs STM32WB55

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Side-by-side comparison of EFR32MG24 and STM32WB55 BLE SoCs.

    
    

      
    

  


  
  
  

    
      

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EFR32MG24

      

      

    
    
      

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STM32WB55

      

      

    
  

  

  
  

  






  
  

    
EFR32MG24 vs STM32WB55: Premium Multiprotocol BLE SoC Comparison


Overview


The Silicon Labs EFR32MG24 and STMicroelectronics STM32WB55 are both multiprotocol BLE SoCs aimed at smart home and IoT applications, but they represent different generations and capability levels. The STM32WB55 is an established dual-core SoC with a proven track record in BLE + Zigbee products. The EFR32MG24 is Silicon Labs' next-generation premium multiprotocol platform, purpose-built for Thread/Wi-Fi." data-category="Protocols & Profiles">Matter certification and enhanced with an on-chip AI/ML accelerator — features that push it ahead of the WB55 in capability but also in cost.


The STM32WB55 employs a dual-core architecture: an application-side ARM Cortex-M4F at 64 MHz and a radio-side Cortex-M0+ that runs the BLE/Zigbee/OpenThread stack independently. This separation ensures that application processor load — USB handling, display drivers, FreeRTOS tasks — does not introduce jitter into the radio timing. With 1 MB of Flash and 256 KB of RAM split between cores, the WB55 provides substantial headroom for real-world firmware.


The EFR32MG24 integrates a single ARM Cortex-M33 at up to 78 MHz, with 1536 KB of Flash and 256 KB of RAM. Critically, it adds a dedicated MVP (Matrix Vector Processor) hardware accelerator for TensorFlow Lite Micro inference, enabling on-device classification, anomaly detection, and keyword spotting without a separate NPU. The MG24 is Matter-certified and supports concurrent BLE 5.3, Thread, and Zigbee operation — a combination that makes it the reference platform for Matter bridge devices.




Key Differences


    

  • AI/ML hardware: EFR32MG24 includes an MVP hardware accelerator for ML inference; STM32WB55 has no ML hardware.
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  • Core architecture: STM32WB55 uses dual-core M4F + M0+ for application/radio isolation; EFR32MG24 uses a single M33 with higher clock speed.
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  • Matter certification: EFR32MG24 is a Silicon Labs Matter reference platform; STM32WB55 can run Matter via OpenThread but with more integration effort.
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  • Memory: MG24 has 1536 KB Flash / 256 KB RAM; WB55 has 1 MB Flash / 256 KB RAM — MG24 has 50% more Flash.
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  • BLE version: MG24 supports BLE 5.3; WB55 supports BLE 5.0/5.2.
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  • USB: STM32WB55 includes full-speed USB 2.0 FS; EFR32MG24 does not — a significant difference for USB HID or CDC applications.
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  • Ecosystem: STM32WB55 integrates with the full STM32 HAL/LL middleware stack; EFR32MG24 uses Silicon Labs' Simplicity SDK with Gecko bootloader and OTA framework.
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  • Price: EFR32MG24 is notably more expensive than STM32WB55, reflecting its premium ML and Matter features.
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Use Cases


EFR32MG24 is ideal for:
- Matter end devices and border routers requiring concurrent BLE + Thread + Zigbee
- Smart home products needing on-device ML inference (voice keyword, occupancy, vibration analysis)
- Silicon Labs Simplicity-based ecosystems where Matter SDK and Gecko bootloader are already adopted


STM32WB55 is ideal for:
- Teams with existing STM32 expertise seeking BLE + Zigbee without Matter complexity
- USB HID bridges and devices requiring full-speed USB 2.0 FS
- Products running FreeRTOS application code on M4F with isolated BLE timing on M0+
- Cost-sensitive multiprotocol designs where MG24's ML features are not needed




Verdict


The EFR32MG24 is the technically superior platform for Matter-centric smart home products and any application requiring on-device ML. The STM32WB55 remains a strong choice for teams leveraging the STM32 ecosystem, USB functionality, and dual-core determinism at a lower cost. If Matter and ML are on the roadmap, the MG24 is worth the premium; if they are not, the WB55 delivers comparable multiprotocol capability at a friendlier price.

  

  

  
  

  
  

    




  
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.