BAL-2690D3U

Balun Overview

The BAL-2690D3U is a radio frequency balun transformer manufactured by STMicroelectronics, designed for the 2.402GHz to 2.48GHz ISM band. It transforms single-ended signals to differential signals with a maximum insertion loss of 1.1dB and a minimum return loss of 14dB. The component features a phase difference of 10 degrees and operates at an impedance of 50 ohms. It is housed in a compact 4-WFBGA surface-mount package.

Balun Feature Summary

• Transforms single-ended signals to differential signals for Bluetooth applications
• Optimized for the 2.45GHz ISM band operation
• Customized specifically for integration with the STLC2690 Bluetooth transceiver

Balun Applications

• Bluetooth signal conversion
• ISM band wireless communication
• Integration with STLC2690 transceivers

Balun Procurement Notes

This component is officially listed as obsolete by the manufacturer. Availability is limited to existing stock only, and no new production will be undertaken once current inventory is depleted. Buyers should verify the specific ordering suffix against official documentation to ensure correct packaging and variant identification before purchase.

Balun Selection Notes

Select this part when interfacing with the STLC2690 Bluetooth transceiver to ensure optimized performance within the specified bandwidth. The design focuses on minimizing insertion loss for efficient signal transformation. Verify that the application strictly requires the 2.402GHz to 2.48GHz frequency range and the specific WFBGA package footprint.

Balun Part Context

The BAL-2690D3U belongs to the family of RF balun transformers intended for short-range wireless connectivity. It serves as a critical interface component between single-ended RF sources and differential antenna structures or filters. This specific model was engineered to support legacy Bluetooth protocols requiring precise impedance matching and signal integrity in compact form factors.

Balun Replacement Considerations

BD2425NNRF from TTM Technologies, Inc. is documented as a similar substitute option.