nRF54L15 vs ESP32-C3

nRF54L15 vs ESP32-C3

The Nordic nRF54L15 and Espressif ESP32-C3 are both RISC-V-based BLE chips — a rare architectural commonality — but serve very different purposes. The nRF54L15 is a premium ultra-low-power BLE 5.4 SoC; the ESP32-C3 is a cost-optimized Wi-Fi + BLE 5.0 SoC designed to bring Wi-Fi connectivity to the lowest possible price point.

Overview

Nordic nRF54L15 uses a hybrid Cortex-M33 application core (128 MHz) and a RISC-V network core (64 MHz) for BLE 5.4 wireless processing. It represents Nordic's latest generation of ultra-low-power BLE design, succeeding the nRF52840 with improved power efficiency and BLE 5.4 Channel Sounding. The RISC-V core handles the BLE protocol stack independently, freeing the M33 for application code.

Espressif ESP32-C3 features a single RISC-V core at 160 MHz and integrates Wi-Fi 802.11 b/g/n plus BLE 5.0. It is Espressif's entry-level Wi-Fi + BLE SoC, priced below $1.50 in volume. The ESP32-C3 was designed as a cost-optimized upgrade from the original ESP8266, adding BLE alongside Wi-Fi and switching to RISC-V for improved code density and open-source toolchain compatibility.

Key Differences

• RISC-V architecture: Both chips use RISC-V, but in different roles. nRF54L15 uses RISC-V only for the BLE network core (not user-accessible). ESP32-C3's single RISC-V core runs all user application code.
• Wi-Fi: ESP32-C3 includes Wi-Fi 802.11 b/g/n. nRF54L15 has no Wi-Fi.
• BLE version: nRF54L15 supports BLE 5.4 with Channel Sounding; ESP32-C3 supports BLE 5.0.
• Power consumption: nRF54L15 is purpose-built for ultra-low power. ESP32-C3's active Wi-Fi current (80–160 mA) is orders of magnitude higher than nRF54L15 in BLE-active mode.
• CPU performance: ESP32-C3 at 160 MHz single RISC-V core provides moderate compute. nRF54L15's M33 at 128 MHz is slightly less raw compute but with better code execution efficiency.
• Cost: ESP32-C3 modules are among the cheapest Wi-Fi + BLE solutions available (< $2). nRF54L15 is positioned at a higher price tier.
• Memory: ESP32-C3 has 400 KB SRAM + up to 16 MB external Flash. nRF54L15 is designed for embedded use.
• Security: nRF54L15 has TrustZone on the M33 and hardware secure boot. ESP32-C3 has flash encryption and RSA-3072 secure boot, but without TrustZone isolation.
• Ecosystem: ESP32-C3 is fully supported in Arduino, MicroPython, ESP-IDF, and the massive Espressif open-source community. nRF54L15 uses nRF Connect SDK (Zephyr).

Use Cases

nRF54L15 Strengths

• Multi-year battery life on small cells: Medical patches, wearable sensors, and asset trackers where power is the dominant design constraint.
• BLE 5.4 Channel Sounding: Sub-meter distance measurement for access control, digital car keys, and indoor positioning beyond RSSI accuracy.
• Certified BLE stack for regulated industries: Medical-grade BLE implementations with hardware security isolation.
• Long-range BLE Coded PHY: Extended range beyond Wi-Fi coverage for outdoor or large-building sensor deployments.

ESP32-C3 Strengths

• Lowest-cost Wi-Fi + BLE integration: At under $2 with Wi-Fi included, ESP32-C3 is unbeatable for simple cloud-connected devices.
• Wi-Fi provisioning + BLE control: Devices that use BLE for local smartphone control and Wi-Fi for cloud sync — a very common IoT pattern.
• MicroPython and CircuitPython: ESP32-C3 is broadly supported in interpreted languages for rapid prototyping.
• Simple gateway devices: Smart plugs, switches, and sensors that need occasional cloud reporting via Wi-Fi with BLE for local configuration.
• Open RISC-V platform: Full RISC-V user application core with open toolchain and no proprietary architecture licensing.

Verdict

Despite sharing RISC-V silicon, the nRF54L15 and ESP32-C3 serve different markets entirely. For battery-first BLE 5.4 applications — wearables, medical devices, proximity sensing — the nRF54L15 is the correct choice. For the cheapest possible Wi-Fi + BLE combo for cloud-connected consumer IoT, the ESP32-C3 wins decisively. The presence or absence of a Wi-Fi requirement is the primary decision criterion between these two chips.