BALFHB-WL-03D3

Overview

The BALFHB-WL-03D3 is an ultra-miniature integrated balun designed for sub-GHz wireless applications. It combines a matching network, balun, and harmonics filter in a single component. The device operates within the 862 MHz to 928 MHz frequency range. It features a 50 Ω nominal input impedance conjugately matched to QFN STM32WL microcontrollers. The antenna side maintains a 50 Ω nominal impedance for both transmit and receive paths. Packaged in an 8-WFBGA CSPBGA format, it utilizes IPD technology on a non-conductive glass substrate. The thin profile measures ≤ 630 μm after reflow soldering.

Feature Summary

• Integrates matching network, balun, and deep Tx harmonic suppression filter
• Optimized for high power mode operation with QFN STM32WL sub-GHz microcontrollers
• Utilizes IPD technology on non-conductive glass substrate for enhanced RF performance
• Conjugate impedance matching ensures compatibility with specific STM32WL controllers

Applications

• Sub-GHz wireless communication systems using STM32WL microcontrollers
• IoT sensor nodes requiring compact RF front-end solutions
• Low-power wireless transmission modules optimized for 2-layer PCBs

Procurement Notes

Verify that the target design utilizes QFN package STM32WL sub-GHz wireless microcontrollers, as this balun is specifically impedance-matched to these devices. Confirm the application requires operation within the 862 MHz to 928 MHz band. Ensure the PCB layout supports the specified 8-WFBGA CSPBGA package dimensions and allows for the required ≤ 630 μm height constraint after reflow. Check for ECOPACK2 compliance requirements if environmental standards are mandated.

Selection Notes

Select this component when designing with QFN STM32WL sub-GHz wireless microcontrollers to simplify the RF front-end architecture. It is suitable for designs prioritizing minimal board space and low insertion loss. The integrated harmonic filter reduces the need for external filtering components. Consider this part for applications requiring optimization in high power mode while maintaining a thin profile compatible with standard 2-layer PCB manufacturing processes.

Part Context

This component belongs to the BALFHB-WL series of ultra-miniature baluns from STMicroelectronics. Similar parts in this family include the BALFHB-WL-02D3 and BALFHB-WL-05D3, which share the same integration concept but may differ in specific impedance matching or frequency tuning parameters tailored for different variants of the STM32WL microcontroller line.

Replacement Considerations

Direct substitutes within the same series include BALFHB-WL-02D3 and BALFHB-WL-05D3. Verify functional equivalence by confirming the replacement part's impedance match aligns with the specific STM32WL MCU variant in use. Ensure the alternative component supports the same 862 MHz to 928 MHz operating range and package type.