Chip vs Chip

nRF52840 vs nRF5340

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Side-by-side comparison of nRF52840 and nRF5340 BLE SoCs.

    
    

      
    

  


  
  
  

    
      

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nRF52840

      

      

    
    
      

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nRF5340

      

      

    
  

  

  
  

  






  
  

    
nRF52840 vs nRF5340: Nordic's USB/Thread Flagship vs Dual-Core Security Platform


Both the nRF52840 and nRF5340 are premium Nordic Semiconductor BLE SoCs supporting multi-protocol wireless. They represent consecutive generations of Nordic's flagship devices, with the nRF5340 introducing dual-core architecture, BLE 5.3, and advanced security features.




Overview


Nordic nRF52840 is the flagship of the nRF52 Series: Cortex-M4F at 64 MHz, 1 MB Flash, 256 KB RAM, BLE 5.0, IEEE 802.15.4 (Thread/Zigbee), USB 2.0 FS device/host, and ANT. It is widely used in Matter-certified devices, USB BLE dongles, and complex IoT gateways. Launched in 2018, it has extensive production deployment and nRF Connect SDK support.


Nordic nRF5340 introduces the nRF53 Series architecture: dual-core Cortex-M33 with separate 128 MHz application core and 64 MHz network core. The network core runs the BLE 5.3 or IEEE 802.15.4 stack in complete isolation from application code. Flash is divided: 1 MB application + 256 KB network, RAM is 512 KB application + 64 KB network. Key security additions include Arm TrustZone on both cores, CryptoCell-312 hardware accelerator, and Arm CryptoIsland CI-300 for key management. BLE 5.3 adds ATT bearers for throughput." data-category="LE Audio">EATT for parallel GATT operations and improved LC3 codec and Auracast." data-category="LE Audio">LE Audio support.




Key Differences


    

  • Core architecture: nRF5340 has two independent M33 cores (application + network); nRF52840 has one M4F handling both.
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  • Application RAM: nRF5340 has 512 KB application RAM vs nRF52840's 256 KB — 2x more for application logic.
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  • BLE version: nRF5340 supports BLE 5.3 with EATT; nRF52840 supports BLE 5.0.
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  • Security: nRF5340 has Arm TrustZone, CryptoCell-312, and CI-300 key management; nRF52840 has CryptoCell-310 (less capable).
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  • Radio isolation: nRF5340 network core maintains deterministic radio timing regardless of application core load; nRF52840 single-core shares interrupt time between radio SoftDevice and application.
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  • LE Audio: nRF5340 is Nordic's recommended platform for LE Audio (LC3 codec, CIS, BIS); nRF52840 does not support LE Audio without significant limitations.
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  • USB: Both have USB 2.0 FS device/host.
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  • Thread/Zigbee: Both support IEEE 802.15.4; nRF5340 separates 802.15.4 stack onto network core.
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  • Development: Both use nRF Connect SDK with Zephyr; nRF5340 adds inter-core IPC management complexity.
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  • Price: nRF5340 commands approximately 20-30% premium over nRF52840.
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Use Cases


When nRF52840 Excels


    

  • Mature multi-protocol products: Matter-certified Thread devices, Thread border router dongles, and Zigbee coordinators with a production-proven platform.
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  • USB BLE accessories: Keyboards, mice, game controllers, and BLE-USB dongles using native USB without dual-core complexity.
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  • Cost-constrained premium IoT: When nRF52840's capabilities are sufficient and the nRF5340 premium is unjustified.
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  • Simple Matter devices: Smart plugs, light bulbs, and switches where BLE 5.0 and BLE commissioning are sufficient.
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When nRF5340 Excels


    

  • LE Audio products: Hearables, hearing aids, and broadcast audio devices requiring LC3 codec hardware and Auracast — nRF5340 is Nordic's designated LE Audio platform.
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  • Security-critical devices: Smart locks, medical monitors, and payment accessories needing TrustZone isolation, hardware key management, and device attestation.
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  • Complex BLE hubs: Central devices maintaining multiple simultaneous BLE connections with EATT for parallel GATT operations.
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  • Real-time + BLE: Applications requiring deterministic real-time processing on the application core without radio stack interference — separated M33 cores eliminate this conflict.
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  • Complex Matter gateways: Devices bridging multiple protocols (BLE + Thread + Zigbee) while running cloud connectivity on the application core.
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Verdict


The nRF52840 remains an excellent production platform for multi-protocol IoT, USB BLE accessories, and Matter devices — its ecosystem maturity and cost efficiency make it the practical choice for straightforward premium designs. The nRF5340 is Nordic's strategic platform for LE Audio, high-security applications, and the most demanding BLE use cases requiring core isolation and BLE 5.3 features. For new product development in 2024+, default to nRF5340 if your design requires LE Audio, TrustZone security, or deterministic dual-core execution. For established patterns (Thread border router, USB HID), nRF52840 remains a reliable, cost-effective choice.

  

  

  
  

  
  

    




  
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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.