Chip vs Chip

WBZ451 vs CYW20820

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Side-by-side comparison of WBZ451 and CYW20820 BLE SoCs.

    
    

      
    

  


  
  
  

    
      

        A
        
WBZ451

      

      

    
    
      

        B
        
CYW20820

      

      

    
  

  

  
  

  






  
  

    
WBZ451 vs CYW20820: Microchip Multiprotocol BLE vs Infineon Dual-Mode Automotive Bluetooth


Overview


The Microchip WBZ451 and Infineon's CYW20820 are both BLE-capable SoCs with multiprotocol ambitions, but they approach the problem from different directions and serve different primary markets. The WBZ451 is Microchip's entry into affordable BLE + Zigbee multiprotocol SoCs, designed for smart home and IoT applications within the MPLAB ecosystem. The CYW20820 is Infineon's (formerly Cypress) dual-mode Bluetooth SoC — supporting both Classic Bluetooth and BLE 5.2 — with AEC-Q100 automotive qualification targeting vehicle electronics, industrial infrastructure, and enterprise Bluetooth mesh.


The WBZ451 uses an ARM Cortex-M4F at 64 MHz with 1 MB Flash and 128 KB RAM. It supports concurrent BLE 5.2 and Zigbee 3.0 operation, which is particularly useful for smart home devices that need BLE for phone provisioning and Zigbee for mesh operation. Microchip positions it as the wireless upgrade path for PIC and AVR developers, with Harmony 3 middleware providing BLE and Zigbee stacks integrated into the familiar MPLAB X IDE.


The CYW20820 integrates dual-mode Bluetooth (Classic BR/EDR + BLE 5.2) for applications needing both legacy audio profile compatibility (A2DP, HFP, SPP) and low-energy BLE data links. Its Cortex-M4 application core, WICED SDK, and Bluetooth mesh stack support infrastructure-level deployments. The AEC-Q100 Grade 1 qualification is the CYW20820's most distinctive credential — it enables deployment in automotive head units and telematics systems where non-automotive chips are not acceptable.




Key Differences


    

  • Protocols: WBZ451 supports BLE 5.2 + Zigbee 3.0 (no Classic Bluetooth); CYW20820 supports Bluetooth Classic + BLE 5.2 (no Zigbee or Thread).
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  • Automotive qualification: CYW20820 is AEC-Q100 Grade 1 certified (-40°C to 105°C); WBZ451 is a commercial/industrial-grade part (not automotive-qualified).
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  • Zigbee: WBZ451 supports Zigbee 3.0 for IoT mesh; CYW20820 does not support Zigbee or IEEE 802.15.4.
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  • Bluetooth Classic: CYW20820 supports BR/EDR for A2DP audio and legacy serial profiles; WBZ451 is BLE-only (no Classic Bluetooth).
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  • Memory: WBZ451 has 1 MB Flash / 128 KB RAM on-chip; CYW20820 supports external SPI Flash for larger firmware, with different on-chip memory architecture.
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  • Ecosystem: WBZ451 uses MPLAB Harmony 3 / MPLAB X; CYW20820 uses Infineon WICED SDK — different tools and supply chain relationships.
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  • Power: WBZ451 is optimized for IoT sensor duty cycling; CYW20820 is optimized for automotive operating conditions with higher active current tolerance.
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  • Cost: WBZ451 is priced at IoT commodity levels; CYW20820 carries automotive-tier pricing reflecting its qualification costs.
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Use Cases


WBZ451 is ideal for:
- Smart home end devices (smart plugs, lighting controllers, window sensors) using Zigbee mesh + BLE provisioning
- Microchip ecosystem teams adding wireless connectivity to PIC/AVR-based product lines
- Cost-sensitive home automation products requiring BLE + Zigbee at competitive volumes
- Building automation end nodes where Zigbee 3.0 is the established protocol


CYW20820 is ideal for:
- Automotive head units requiring AEC-Q100-qualified Bluetooth Classic (audio/telephony) and BLE (data/OTA)
- Vehicle telematics units requiring both legacy Bluetooth device support and BLE sensor connectivity
- Enterprise Bluetooth mesh infrastructure in manufacturing plants and warehouses requiring extended temperature operation
- Industrial applications where the AEC-Q100 qualification provides the reliability evidence required for procurement




Verdict


Choose the WBZ451 when building smart home or IoT products within the Microchip ecosystem requiring BLE + Zigbee 3.0 at an affordable price. Choose the CYW20820 when Bluetooth Classic backward compatibility, AEC-Q100 automotive qualification, or industrial extended-temperature operation (-40°C to 105°C) are required. The two chips serve distinct markets — smart home IoT versus automotive/industrial — and rarely compete for the same design.

  

  

  
  

  
  

    




  
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.