nRF5340 vs EFR32MG24

nRF5340 vs EFR32MG24

The Nordic Semiconductor nRF5340 and Silicon Labs EFR32MG24 are two of the most capable BLE SoCs on the market, both targeting applications that demand robust security, multi-protocol support, and reliable wireless performance. They compete directly in the smart home, industrial IoT, and medical device markets.

Overview

Nordic nRF5340 is Nordic's flagship dual-core Arm Cortex-M33 SoC, introduced in 2020. It features separate network (64 MHz) and application (128 MHz) cores — a hardware isolation architecture that keeps the wireless stack sandboxed from application code. It supports BLE 5.3, Bluetooth Mesh, Thread, Zigbee, and proprietary 2.4 GHz protocols simultaneously. With TrustZone, ARM CryptoCell-312, and a dedicated security domain, it is one of the most secure BLE SoCs available. The nRF5340 is a premium device aimed at complex, security-critical applications.

Silicon Labs EFR32MG24 is part of Silicon Labs' Multiprotocol Gecko series, launched in 2022. It runs a single Arm Cortex-M33 at up to 78 MHz and incorporates Silicon Labs' Secure Vault Mid security subsystem — providing secure key storage, secure boot, anti-tamper, and attestation. The MG24 supports BLE 5.3, Zigbee, Thread, Matter, and proprietary 2.4 GHz. Notably, it integrates an AI/ML hardware accelerator for on-device inference, a differentiator that the nRF5340 lacks.

Key Differences

• Core architecture: nRF5340 uses dual Cortex-M33 cores (network + application separation); EFR32MG24 uses a single Cortex-M33 with a dedicated Secure Vault subsystem.
• Security: Both offer TrustZone and secure boot. nRF5340 adds ARM CryptoCell-312 with a hardware random number generator. EFR32MG24's Secure Vault Mid provides tamper detection and secure attestation via PSA Certified Level 3.
• AI/ML: EFR32MG24 integrates a hardware AI/ML accelerator (MVP). nRF5340 has no dedicated ML hardware.
• BLE version: Both support BLE 5.3 with LC3 codec and Auracast." data-category="LE Audio">LE Audio capabilities.
• Memory: nRF5340 offers up to 1 MB Flash + 512 KB RAM (application core) and 256 KB Flash + 64 KB RAM (network core). EFR32MG24 offers up to 1.5 MB Flash + 256 KB RAM.
• Power: Both achieve sub-2 µA deep sleep. nRF5340's dual-core approach allows the network core to be kept active while the application core sleeps, reducing wake-up overhead.
• Ecosystem: Nordic has nRF Connect SDK (Zephyr-based); Silicon Labs has Simplicity Studio with GSDK. Both are mature.
• Multi-protocol: Both handle concurrent BLE + Thread/Zigbee, but nRF5340's dual-core hardware time-sharing is more deterministic.

Use Cases

nRF5340 Strengths

• Security-critical wearables and medical devices: The hardware dual-core isolation makes nRF5340 attractive for FDA-regulated medical devices where network stack compromise must not affect application integrity.
• Complex concurrent wireless applications: Products needing simultaneous BLE Mesh + Thread + proprietary radio benefit from the nRF5340's deterministic multi-protocol scheduler.
• LE Audio hearing aids: Nordic's long history in audio profiles and mature LE Audio support makes nRF5340 a natural fit.
• Industrial gateways: Devices aggregating data from multiple wireless protocols rely on nRF5340's robust concurrency.

EFR32MG24 Strengths

• Matter-native smart home devices: Silicon Labs has invested heavily in Matter certification infrastructure, and the MG24 is a primary target for Matter over Thread and Matter over Wi-Fi (with companion chips).
• AI-enhanced edge sensing: The integrated MVP accelerator enables keyword spotting, gesture recognition, or anomaly detection without a separate ML chip.
• High-security industrial devices: Secure Vault's anti-tamper and attestation features meet PSA Certified Level 3, suitable for industrial cybersecurity compliance.
• Cost-optimized professional IoT: The MG24 is competitively priced for high-volume smart home and commercial building deployments.

Verdict

Both chips are excellent choices for demanding multi-protocol BLE applications. Choose the nRF5340 when hardware isolation between wireless stack and application code is a non-negotiable requirement, or when complex concurrent multi-protocol scheduling is needed — particularly in devices that combine BLE Mesh, Thread, and Zigbee simultaneously. The nRF5340's dual-core architecture provides hardware-enforced separation that a single-core design cannot replicate, making it the more defensible choice for safety-critical or certified wireless products.

Choose the EFR32MG24 when on-device AI/ML inference is a product differentiator (the MVP hardware accelerator is genuinely unique at this price point), when Matter certification and Silicon Labs' certification support pipeline are valued, or when PSA Certified Level 3 attestation is required by a regulatory or procurement specification. For pure BLE applications without AI needs, the nRF5340's dual-core architecture offers superior wireless determinism, while the EFR32MG24's AI capability provides a growth path for products that may add intelligence over time.