BALF-SPI-02D3

Balun Overview

The BALF-SPI-02D3 is an ultra-miniature balun designed for 433 MHz operation, featuring a 6-WFBGA package with a 0.4mm pitch and 0.39mm height. It integrates a matching network and harmonics filter, offering a nominal input impedance of 50 Ω and a conjugate match to the ST SPIRIT1 transceiver. Key electrical parameters include a maximum insertion loss of 2.3 dB, a minimum return loss of 15 dB, and a phase imbalance of 10°. The device utilizes IPD technology on a non-conductive glass substrate, ensuring low amplitude and phase imbalance with a very low profile under 620 μm after reflow.

Balun Feature Summary

• Integrates matching network and harmonics filter within an ultra-miniature form factor
• Conjugate matched specifically for ST SPIRIT1 transceiver at 433 MHz
• Utilizes IPD technology on non-conductive glass substrate for optimized RF performance
• Provides low insertion loss, low amplitude imbalance, and low phase imbalance

Balun Applications

• RF front-end integration for 433 MHz sub-GHz wireless applications
• Signal conditioning between transceivers and antennas in compact devices
• BOM and area reduction in portable wireless sensor nodes

Balun Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors or verified supply chain channels. Confirm RoHS3 compliance and ECOPACK 2 status during procurement. Ensure storage conditions adhere to MSL Level 1 specifications. Cross-reference datasheet DM00151360 for final design-in validation before ordering.

Balun Selection Notes

Select this component when designing for 433 MHz ISM band applications requiring tight integration with ST SPIRIT1 transceivers. The integrated harmonic filter eliminates external components, reducing board space. Consider the 6-WFBGA package constraints for surface mount assembly. This part is suitable for applications prioritizing minimal footprint and high RF performance over generic balun solutions.

Balun Part Context

Part of the BALF series from STMicroelectronics, focusing on ultra-miniature baluns. The BALF-SPI-02D3 is distinct from the BALF-SPI2-02D3, which is customized for the S2-LP transceiver. Both share similar packaging but differ in specific impedance matching targets and electrical characteristics tailored to their respective companion chips.

Balun Replacement Considerations

BALF-SPI2-02D3 serves as a functional alternative for designs utilizing the S2-LP transceiver instead of SPIRIT1. Verify impedance matching compatibility before substitution, as the BALF-SPI-02D3 is specifically conjugate-matched to SPIRIT1.