Chip vs Chip

EFR32MG24 vs WBZ451

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Side-by-side comparison of EFR32MG24 and WBZ451 BLE SoCs.

    
    

      
    

  


  
  
  

    
      

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EFR32MG24

      

      

    
    
      

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WBZ451

      

      

    
  

  

  
  

  






  
  

    
EFR32MG24 vs WBZ451: Premium Multiprotocol vs Cost-Optimized Multiprotocol BLE SoC


Overview


The EFR32MG24 and Microchip's WBZ451 both support BLE and Zigbee in a single SoC, making them direct competitors in the multiprotocol IoT space — but with significantly different capability levels and price points. The WBZ451 is Microchip's affordable entry into dual-protocol wireless SoCs, targeting developers in the Microchip/PIC ecosystem who need BLE + Zigbee without paying a premium. The EFR32MG24 is Silicon Labs' flagship platform with Thread/Wi-Fi." data-category="Protocols & Profiles">Matter support, on-chip AI/ML, Secure Vault High, and the highest Flash density in its family.


The WBZ451 uses an ARM Cortex-M4F at 64 MHz with 1 MB Flash and 128 KB RAM — adequate for typical BLE + Zigbee 3.0 applications. Microchip's MPLAB Harmony 3 framework provides a well-integrated development environment for teams familiar with the Microchip toolchain. Its competitive pricing makes it attractive for high-volume home automation products where BOM cost is a key differentiator.


The EFR32MG24 raises the capability bar significantly: 1536 KB Flash (50% more than WBZ451), 256 KB RAM (double WBZ451), concurrent BLE 5.3 + Thread + Zigbee + Matter, an MVP AI/ML accelerator, and Secure Vault High. The Matter certification and Thread support are particularly significant — they position the MG24 as the right chip for the next generation of Matter-native smart home devices, while the WBZ451's Thread support is more limited.




Key Differences


    

  • Matter support: EFR32MG24 is a Matter reference platform with full Thread and BLE concurrent operation; WBZ451's Matter support is less mature.
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  • AI/ML: EFR32MG24 includes an MVP hardware accelerator for on-device ML inference; WBZ451 has no ML hardware.
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  • Memory: MG24 has 1536 KB Flash / 256 KB RAM; WBZ451 has 1 MB Flash / 128 KB RAM — MG24 has a substantial memory advantage.
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  • Security: EFR32MG24 provides Secure Vault High (PUF, HSM key management, attestation); WBZ451 provides hardware AES but lacks equivalent key lifecycle management.
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  • CPU performance: WBZ451's M4F with FPU offers hardware floating-point; MG24's M33 at 78 MHz may offer comparable integer performance but WBZ451 has the FPU advantage for floating-point intensive tasks.
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  • Ecosystem: WBZ451 uses MPLAB X / Harmony 3 (Microchip ecosystem); MG24 uses Simplicity Studio / Gecko SDK (Silicon Labs ecosystem).
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  • Cost: WBZ451 is priced significantly below MG24, making it attractive for cost-sensitive volumes.
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  • BLE version: MG24 supports BLE 5.3; WBZ451 supports BLE 5.2.
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Use Cases


EFR32MG24 is ideal for:
- Matter-certified smart home devices requiring the full Thread + BLE + Zigbee concurrent stack
- Products with on-device ML requirements (occupancy detection, environmental classification)
- Security-sensitive applications needing Secure Vault High key management
- Silicon Labs ecosystem products where Gecko SDK integration simplifies development


WBZ451 is ideal for:
- Home automation products (smart plugs, lighting, sensors) targeting BLE + Zigbee 3.0 at competitive BOM cost
- Microchip ecosystem teams extending PIC/AVR designs with wireless connectivity
- High-volume consumer products where per-unit cost is more important than cutting-edge features
- Designs where an FPU for floating-point sensor fusion is more valuable than ML hardware




Verdict


The EFR32MG24 is the better chip for products requiring Matter, advanced security, or ML inference — and for those use cases, the cost premium is justified. The WBZ451 is the better choice for teams in the Microchip ecosystem, cost-driven production designs, and products where BLE + Zigbee 3.0 is sufficient without the advanced Matter and ML capabilities of the MG24.

  

  

  
  

  
  

    




  
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.