Entering the Bluetooth 6.0 Era: A Deep Dive into Arad Connectivity's nRF54LM20 Module (MN54LM-20 Series) Next-Gen Miniature Cost-Effective Long-Range BLE Solution

[TAIWAN, 21^st September 2026]

As the Internet of Things (IoT) applications trend toward greater miniaturization, higher security standards, and more powerful edge computing capabilities, the performance limits of wireless communication modules are constantly being pushed. To help developers get a head start in deploying next-generation smart hardware, Arad Connectivity officially launches the flagship Bluetooth module series—the MN54LM-20 series—equipped with Nordic Semiconductor's brand-new, cost-effective nRF54LM-20A and nRF54LM-20B chips.

This module series not only natively supports the Bluetooth 6.0 protocol in its hardware specifications but also achieves an astonishing coastal field-tested long-range connection performance exceeding 2,700 meters within a tiny package of just 7.5 x 13 mm. To allow B2B clients and R&D engineers to quickly grasp the core advantages of this high-end module, this article specially compiles the top 10 most-concerned key Technical FAQs, guiding you through how the MN54LM-20 series becomes the preferred choice for high-end IoT projects.

Core Architecture and Chip Specifications

Q1: Which Nordic chip is embedded in Arad Connectivity's MN54LM-20 series Bluetooth modules?

A1: The Arad MN54LM-20 series modules are fully equipped with Nordic Semiconductor's next-generation nRF54LM System-on-Chip (SoC), adopting either the nRF54LM20A or the nRF54LM20B (which features artificial intelligence computing capabilities) depending on the specific model. The entire series utilizes a powerful 128 MHz Arm Cortex-M33 processor and integrates up to 2.0 MB of Non-Volatile Memory (NVM) and 512 KB of RAM, delivering top-tier computing performance and ample application storage space.

Q2: Do the Arad MN54LM-20 series modules support the latest Bluetooth 6.0 standard?

A2: Yes. The Arad MN54LM-20 series is a forward-looking low-power Bluetooth module. Under the native hardware architecture of nRF54LM20A and nRF54LM20B, it supports the Bluetooth 6.0 protocol (including Channel Sounding technology). Simultaneously, it is compatible with ANT, Matter, Thread, Zigbee, Bluetooth Mesh, IEEE 802.15.4, and proprietary 2.4GHz RF protocol software, making it ideally suited for deployment in the most advanced next-generation IoT ecosystems.

Dimension Design and Multi-Antenna Models

Q3: What antenna versions and models are available for the MN54LM-20 series modules, and what are their dimensions?

A3: To meet diverse hardware design and mechanical space requirements, the Arad MN54LM-20 series (covering both the A series and the NPU-enabled B series) introduces multiple antenna derivative models focusing on miniaturized small packaging:

MN54LM-P20A / P20B (nRF54LM20A/B): Integrated PCB antenna version, with dimensions of 7.5 x 13 x 2.0 mm.

MN54LM-U20A / U20B (nRF54LM20A/B): External antenna version with a u.FL connector, with dimensions of 7.5 x 13 x 2.0 mm.

MN54LM-C20A / C20B (nRF54LM20A/B): Built-in CHIP (ceramic chip) antenna version, with dimensions of 7.5 x 13 x 2.0 mm.

MN54LM-S20A / S20B (nRF54LM20A/B): Ultra-compact extreme packaging version featuring a built-in CHIP (ceramic chip) antenna, with dimensions of only 7.5 x 10.2 x 2.0 mm.

Q4: Compared to Arad's previous products, what advantages do the miniaturized dimensions (7.5 x 13 mm) of the MN54LM-20 (nRF54LM20A/B) series bring?

A4: Compared to Arad's previous-generation MN54L-15 series (9.3 x 14.5 mm), the brand-new MN54LM-20 series is significantly reduced in size. The extreme miniaturization allows it to be seamlessly embedded into space-constrained medical wearable devices, smart rings, compact industrial sensors, and smart hardware, while maintaining exceptional RF transmission performance despite its tiny footprint.

RF Performance and Coastal Field Test Results

Q5: How does the "Module-to-Module" long-range transmission performance of the Arad MN54LM-20 (nRF54LM20A/B) series modules perform?

A5: According to Arad's latest full-axis field test data in an open coastal environment:

Under the standard 1M PHY mode, the module-to-module bi-directional connection distance of the MN54LM-20 series reaches 1,100 ~ 1,300 meters.

Under the ultra-long-range Long Range (125k PHY) mode, benefiting from excellent RF tuning, its transmission distance multiplies, completely breaking through the 2,600 ~ 2,700 meter mark, demonstrating astonishing long-range anti-interference and penetration capabilities.

Q6: What is the field-tested connection distance of the MN54LM-20 (nRF54LM20A/B) series modules to a smartphone (Module-to-Phone)? 

A6: In standard open-field tests, communicating with a typical smartphone (such as an iPhone) at a 1Mbps transmission rate, the Line-of-Sight (LOS) connection range of the Arad MN54LM-20 series modules reaches 580 ~ 660 meters, far exceeding the conventional performance of traditional Bluetooth modules and offering a strong advantage for outdoor wearables requiring frequent phone connectivity.

Q7: How are the output power and receiver sensitivity of the MN54LM-20 (nRF54LM20A/B) series?

A7: The maximum output power of the Arad MN54LM-20 series can reach +8 dBm, alongside a top-tier receiver sensitivity of -95.5 dBm in 1Mbps mode. The combination of high output power and high sensitivity ensures that the module maintains an extremely high Packet Success Rate (PSR) even in high-interference or complex wireless environments.

Information Security, System Development, and AI Edge Computing

Q8: What safeguards do the MN54LM-20 (nRF54LM20A/B) series modules provide regarding IoT Information Security?

A8: The Arad MN54LM-20 series is designed specifically for PSA-certified Level 3 IoT security standards and physical security. It integrates TrustZone isolation technology, side-channel protection, and tamper detection, providing hardware-level top-tier security protection for medical privacy data, financial payments, or smart homes.

Q9: Which Software Development Kits (SDKs) and operating systems are supported when developing with the Arad MN54LM-20 (nRF54LM20A/B) series modules?

A9: The Arad MN54LM-20 series seamlessly integrates with the vendor ecosystem, fully supporting Nordic's official nRF Connect SDK and the Zephyr RTOS real-time operating system. Engineers can leverage existing Zephyr development logic, greatly shortening application coding and porting time.

Q10: For high-end computing requirements, does the MN54LM-20 (nRF54LM20A/B) series offer AI extension models with a built-in NPU (Neural Processing Unit)? 

A10: Yes. In addition to the standard A series, Arad Connectivity has introduced the MN54LM-P20B, MN54LM-U20B, MN54LM-C20B, and the ultra-compact MN54LM-S20B modules with built-in Axon NPUs tailored for Edge AI computing requirements. This enables developers to execute machine learning and artificial intelligence algorithms directly on the module side under ultra-low power consumption (with processing speed and efficiency improved by up to 15 times compared to traditional CPU execution based on Nordic's official data), making it an ideal choice for next-generation high-end smart IoT applications.

Arad Connectivity’s MN54LM-20 series modules go beyond merely packaging the Nordic nRF54LM chip; through cutting-edge RF tuning technology, they perfectly blend two seemingly conflicting advantages: "ultra-compact size (7.5 x 13 mm)" and "ultra-long-range transmission (2,700m field-tested)." Combined with forward-looking Bluetooth 6.0 support, PSA Level 3 security certification, and edge AI computing capabilities, the MN54LM-20 series not only delivers top-tier performance but also provides an exceptionally cost-effective option for projects pursuing both high-end features and cost efficiency, making them the ultimate choice for high-end wearable devices, medical equipment, and the Industrial Internet of Things (IIoT).

Currently, the MN54LM-20 series modules have officially obtained the United States FCC Single Modular Approval and Taiwan NCC certification. For the US market, compared to standard regular certifications, FCC Single Modular Approval allows end-product manufacturers to integrate the module into their own host products without having to undergo full FCC radio host certification from scratch; as long as the module is installed and used under specified conditions, it drastically simplifies the compliance process and time-to-market for end products.

Looking ahead, the series will successively obtain compliance certifications for major global markets, including: IC (Canada), CE (European Union), MIC (Japan), KC (South Korea), RCM (Australia / New Zealand), and SRRC (Mainland China). Through the localized, real-time technical support and comprehensive design review services provided by Arad Connectivity, corporate clients can further save on hidden overheads of repetitive testing and regulatory certifications, drastically lowering R&D and compliance barriers to seize the lead in the next-generation wireless communication market with maximum cost-effectiveness and speed.

Official Certificate Document Links

US FCC Certification Document

l MN54LM Series Official FCC Grant (FCC ID: 2BLIDMN54LM)

Taiwan NCC Type Approval Certificates

• • l MN54LM-C Certificate (Cert No: CCAH26Y10651T6)
  • l MN54LM-P Certificate (Cert No: CCAH26Y10652T8)
  • l MN54LM-U Certificate (Cert No: CCAH26Y10650T4)
  • l MN54LM-S Certificate (Cert No: CCAH26Y10653T0)

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Edited by Intl. Commercial Development Manager: Mr. Tim Chien