Nordic Semi nRF54ML20B Arm Cortex-M33 wireless SoC is the first nRF54L microcontroller to integrate the ultra-efficient Axon Neural Processing Unit (NPU) for edge AI workloads. The NPU is said to deliver up to 7 times faster performance and up to 8 times higher energy efficiency versus (unnamed) competing wireless solutions for tasks such as sound classification, keyword spotting, and image-based detection. The Axon NPU is also about 15x faster compared to using the Cortex-M33 CPU for the same task.
Other than the NPU, the nRF54LM20B offers exactly the same features as the earlier nRF54LM20A wireless microcontroller, including up to 2 MB NVM, 512 KB RAM, a 128 MHz Arm Cortex-M33 plus RISC-V coprocessor, high-speed USB, up to 66 GPIOs, and an ultra-low-power 2.4 GHz radio supporting Bluetooth LE, Bluetooth Channel Sounding, Matter over Thread, and more as shown in the nRF54L comparison table below.
| Feature | nRF54LM20B | nRF54LM20A | nRF54L15 | nRF54L10 | nRF54L05 |
|---|---|---|---|---|---|
| Processor | 128 MHz Arm Cortex-M33 | 128 MHz Arm Cortex-M33 | 128 MHz Arm Cortex-M33 | 128 MHz Arm Cortex-M33 | 128 MHz Arm Cortex-M33 |
| AI accelerator | 128 MHz Axon NPU | N/A | N/A | N/A | N/A |
| Flash | 2 MB | 2 MB | 1.5 MB | 1.0 MB | 0.5 MB |
| RAM | 512 KB | 512 KB | 256 KB | 192 KB | 96 KB |
| Bluetooth LE | Yes | Yes | Yes | Yes | Yes |
| Bluetooth Channel Sounding | Yes | Yes | Yes | Yes | Yes |
| Bluetooth Mesh, Zigbee, Thread | Zigbee, Thread | Zigbee, Thread | Zigbee, Thread | Zigbee, Thread | Zigbee, Thread |
| Matter, Aliro, Amazon Sidewalk | Matter, Aliro, Amazon Sidewalk | Matter, Aliro, Amazon Sidewalk | Matter, Aliro | Matter, Amazon Sidewalk | - |
| ESB and 2.4 GHz proprietary protocols (with 4 Mbps) | Yes | Yes | Yes | Yes | Yes |
| NFC | Yes | Yes | Yes | Yes | Yes |
| Wi-Fi (with nRF70 Series companion ICs) | Yes | Yes | - | - | - |
| TX power | Up to 8 dBm | Up to 8 dBm | Up to 8 dBm | 7 dBm | 7 dBm |
| RX sensitivity (1 Mbps Bluetooth LE) | -96 dBm | -96 dBm | -96 dBm | -96 dBm | -96 dBm |
| RX sensitivity (IEEE 802.15.4) | -101 dBm | -101 dBm | -101 dBm | -101 dBm | -101 dBm |
| RISC-V coprocessor | 128 MHz FLPR | 128 MHz FLPR | 128 MHz FLPR | 128 MHz FLPR | 128 MHz FLPR |
| Digital interfaces | High-speed USB, High-speed SPI/UART, 6x SPI/UART/TWI, PDM, TDM, PWM, QDEC | High-speed USB, High-speed SPI/UART, 6x SPI/UART/TWI, PDM, TDM, PWM, QDEC | High-speed SPI/UART, 4x SPI/UART/TWI, PDM, I2S, PWM, QDEC | High-speed SPI/UART, 4x SPI/UART/TWI, PDM, I2S, PWM, QDEC | High-speed SPI/UART, 4x SPI/UART/TWI, PDM, I2S, PWM, QDEC |
| ADC | 8ch, up to 14-bit, up to 2MS/s | 8ch, up to 14-bit, up to 2MS/s | 8ch, up to 14-bit, up to 2MS/s | 8ch, up to 14-bit, up to 2MS/s | 8ch, up to 14-bit, up to 2MS/s |
| Isolation | TrustZone | TrustZone | TrustZone | TrustZone | TrustZone |
| Cryptographic accelerator and tamper detectors | Yes | Yes | Yes | Yes | Yes |
| Operating temperature | -40 to +85°C | -40 to +85°C | -40 to +105°C | -40 to +105°C | -40 to +105°C |
| Supply and GPIO voltage range | 1.7 to 3.6 V | 1.7 to 3.6 V | 1.7 to 3.6 V | 1.7 to 3.6 V | 1.7 to 3.6 V |
| Packages | 6x6 mm QFN52 with 35 GPIOs 3.9x3.7 mm CSP98 with 66 GPIOs | 6x6 mm QFN52 with 35 GPIOs 3.9x3.7 mm CSP98 with 66 GPIOs | 6x6 mm QFN52 with 35 GPIOs, 6x6 mm QFN48 with 31 GPIOs, 5x5 mm QFN40 with 24 GPIOs 2.4x2.2 mm CSP47 with 32 GPIOs | 6x6 mm QFN52 with 35 GPIOs, 6x6 mm QFN48 with 31 GPIOs, 5x5 mm QFN40 with 24 GPIOs | 6x6 mm QFN52 with 35 GPIOs, 6x6 mm QFN48 with 31 GPIOs, 5x5 mm QFN40 with 24 GPIOs |
Like other nRF54L wireless SoCs, the nRF54ML20B is supported by the nRF Connect SDK. However, Nordic Semi also released two ultra-tiny Neuton edge AI models that are typically under 5 KB and up to 10 times smaller, faster, and more efficient than other CPU-run models.
A tool called the “Nordic Edge AI Lab” also helps developers generate custom Neuton models running on-device (without cloud connectivity) for anomaly detection, activity and gesture recognition, biometric monitoring, and more.
Nordic Edge AI Lab and custom Neuton models are available today for Nordic wireless nRF54 Series SoCs and cellular IoT SiP modules. You’ll find details on the Edge AI page on the Nordic Semiconductor website. The nRF54LM20B SoC with Axon NPU is currently sampling to selected customers, and general availability is scheduled for Q2 2026. There’s no information about an nRF54KM20B development kit, but we’re told (YouTube comments) that “samples and DKs can be requested” through the form on the the product page. The company is currently showcasing its solutions at CES 2026.
Thanks to TLS for the tip
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.
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