Silicon Labs SLWRB4164A

Overview

SLWRB4164A from Silicon Labs is a Mighty Gecko dual-band (2.4 GHz and 915 MHz) radio evaluation board built around the EFR32MG12P433F1024GL125 Wireless SoC, featuring an ARM Cortex-M4 with FPU, 1024 kB flash, 256 kB RAM, and integrated RF matching networks optimized for 19 dBm output power. It includes an on-board inverted-F PCB antenna for 2.4 GHz operation and an SMA connector for 915 MHz external antenna use.

For engineers reviewing the SLWRB4164A datasheet, SLWRB4164A pinout, SLWRB4164A application, or SLWRB4164A equivalent, this board serves as a production-ready RF reference design for Zigbee®, Thread, Bluetooth® Low Energy, and proprietary wireless protocols - supporting conducted and radiated RF validation, mesh network debugging, and energy profiling via Simplicity Studio.

Technical Context

The SLWRB4164A implements two independent RF paths: a 2.4 GHz path routed through a four-element impedance-matching and harmonic-filter network to an integrated inverted-F antenna (tuned to ~50 Ω), and a 915 MHz path using a discrete balun, differential matching, and SMA interface. Both paths are optimized for 19 dBm output power with validated FCC 15.247 and ETSI EN 300-328 compliance margins.

It integrates LFXO (32.768 kHz) and HFXO (38.4 MHz) crystals, supports capacitive touch slider (PC0–PC3), and connects to the Wireless Starter Kit Mainboard via dual-row 0.05" pitch polarized connectors exposing all EFR32MG12 GPIOs, debug interfaces (SWD, SWO, TDI/TMS/TCK), UART, and power rails including PAVDD, RFVDD, and VBIAS.

Key Specifications

Availability

SLWRB4164A is available at Aetrix Electronics and suitable for Zigbee® gateway development, Thread-based smart home sensor nodes, Bluetooth® LE mesh commissioning tools, and proprietary 915 MHz industrial telemetry requiring stable component supply and pre-validated RF performance.

Supply support for SLWRB4164A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Silicon Labs is a fabless semiconductor company specializing in secure, low-power wireless SoCs and IoT connectivity solutions for smart home, industrial, and infrastructure applications.

The SLWRB4164A belongs to the Mighty Gecko radio board family, designed specifically to accelerate development and RF validation of multi-protocol wireless applications targeting certified interoperability and regulatory compliance out-of-the-box.

FAQ

What wireless protocols does the SLWRB4164A support?

The SLWRB4164A supports Zigbee®, Thread, Bluetooth® Low Energy, and proprietary 2.4 GHz and 915 MHz protocols via the onboard EFR32MG12P433F1024GL125 SoC. Its dual-band RF architecture, pre-tuned matching networks, and Simplicity Studio integration enable rapid prototyping and certification-ready development across all these standards without hardware modification.

Does the SLWRB4164A include an on-board antenna?

Yes, the SLWRB4164A includes an integrated printed inverted-F antenna (IFA) tuned for the 2.4 GHz band, delivering ~50 Ω impedance across 2400–2483.5 MHz. For 915 MHz operation, it uses an SMA connector to attach an external whip antenna - the IFA is not used in sub-GHz mode.

How is the SLWRB4164A powered and what voltage rails does it require?

The SLWRB4164A receives 3.3 V from the Wireless Starter Kit Mainboard via its board-to-board connector. Internally, it routes RFVDD (1.8 V from on-chip DC-DC) to the RF analog section and draws 3.3 V externally for PAVDD (2.4 GHz PA) and SUBGRF_ON/OP (sub-GHz PA), enabling high-efficiency 19 dBm operation while maintaining clean analog supply separation.

Can the SLWRB4164A be used for conducted RF measurements?

Yes - for 2.4 GHz conducted testing, the SLWRB4164A provides a UFL connector; the R1 0 Ω resistor must be moved to R2 position to route the 2G4RF_IOP signal to UFL instead of the IFA. For 915 MHz conducted testing, the SMA connector is directly connected to the sub-GHz RF path with no rework required.

Is the SLWRB4164A compliant with ETSI EN 300-328 for 2.4 GHz operation?

The SLWRB4164A achieves EIRP of 22 dBm in radiated 2.4 GHz tests due to the inverted-F antenna's gain - exceeding the ETSI EN 300-328 limit of 20 dBm by 2 dB. To comply, firmware must reduce output power by approximately 2 dB; harmonic emissions remain well within the -30 dBm EIRP limit even at full 19 dBm.