Chip vs Chip

ESP32-C3 vs BlueNRG-LP

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Side-by-side comparison of ESP32-C3 and BlueNRG-LP BLE SoCs.

    
    

      
    

  


  
  
  

    
      

        A
        
ESP32-C3

      

      

    
    
      

        B
        
BlueNRG-LP

      

      

    
  

  

  
  

  






  
  

    
Overview


The ESP32-C3 and BlueNRG-LP are both affordable BLE-capable SoCs, but with different design targets. Espressif's ESP32-C3 is a versatile RISC-V chip with Wi-Fi 4 and Bluetooth Low Energy 5.0, designed for IoT nodes where connectivity flexibility and cost efficiency Thread/Wi-Fi." data-category="Protocols & Profiles">matter. STMicroelectronics' BlueNRG-LP (Low Power) is a BLE 5.2 SoC built around an ARM Cortex-M0+ at 64 MHz, optimized specifically for healthcare, medical, and ultra-low-power wearable applications. Its key differentiators are extremely low peak TX current (~4.8 mA at 8 dBm), sub-1 µA sleep current, and integrated features suited to connected health devices (separate I/O voltage domains, medical-grade EMI performance, and EEPROM emulation).




Key Differences


    

  • BLE version: BlueNRG-LP supports BLE 5.2; ESP32-C3 supports BLE 5.0.
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  • Wi-Fi: ESP32-C3 includes Wi-Fi 4; BlueNRG-LP has no Wi-Fi radio.
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  • Power: BlueNRG-LP achieves ~0.9 µA deep sleep and ~4.8 mA TX at 8 dBm; ESP32-C3 draws ~5 µA deep sleep and ~10 mA TX at 0 dBm—the BlueNRG-LP is significantly more power efficient for BLE-only operation.
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  • Processor: BlueNRG-LP uses ARM Cortex-M0+ at 64 MHz; ESP32-C3 uses RISC-V at 160 MHz.
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  • Healthcare suitability: BlueNRG-LP is designed for medical device applications with separate VBAT and VDDIO domains, supporting battery voltage monitoring, and targeting IEC 60601 EMI compliance; the ESP32-C3 is not positioned for medical device certification.
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  • Memory: BlueNRG-LP has 256 KB RAM and 1 MB flash; ESP32-C3 has 400 KB SRAM and 4 MB flash.
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  • Ecosystem: BlueNRG-LP uses ST's BlueNRG SDK and STM32CubeIDE; ESP32-C3 uses ESP-IDF or Arduino.
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  • RF output power: BlueNRG-LP supports up to +8 dBm TX power; ESP32-C3 supports up to +20 dBm in some configurations—ESP32-C3 wins on range if needed.
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Use Cases


Choose ESP32-C3 when:
- Wi-Fi+BLE co-existence is required.
- Open-source ecosystem, rapid prototyping, and large library base are priorities.
- Healthcare-grade certification is not required.


Choose BlueNRG-LP when:
- A connected medical or healthcare wearable device requires ultra-low-power BLE 5.2 with <1 µA sleep current.
- The design is BLE-only and must pass medical device EMI requirements (IEC 60601).
- Separate power domains (VBAT/VDDIO) and EEPROM emulation for medical parameter storage are needed.
- ST's BlueNRG ecosystem and medical-grade BLE stack are preferred.




Verdict


The BlueNRG-LP is a specialized BLE SoC for medical and healthcare applications—its ultra-low power, medical EMI profile, and separate power domains make it the right choice for connected health devices and medical-grade wearables. The ESP32-C3 is the right choice for general-purpose Wi-Fi+BLE IoT nodes where cost, compute, and open-source toolchain accessibility matter. These chips rarely compete for the same design win: the BlueNRG-LP wins in regulated health applications and the ESP32-C3 wins in everything else.

  

  

  
  

  
  

    




  
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.