50 / 30+j25 Balun transformer for 2.45 GHz ISM band

The BAL-2690D3U is a balun designed to transform single ended signals to differential signals in Bluetooth applications.

The BAL-2690D3U has been customized for the STLC2690 Bluetooth transceiver with 0.8 dB insertion losses in the bandwidth(2400 MHz - 2500 MHz) and with a specific requirement for the SCC22 parameter.

The BAL-2690D3U has been designed using STMicroelectronics IPD (integrated passive device) technology on non conductive glass substrate to optimize RF performance.

Key Features

  • 50 Ω nominal input / 30+j25 output differential impedance
  • Low insertion loss
  • Low amplitude imbalance
  • Low phase imbalance
  • Small footprint: BAL-2690D3U < 1 mm²


Technical Documentation

Product Specifications
Description Version Size
DS6408 DS6408: 50 Ω nominal input / conjugate match balun to STLC2690 3.0 472 KB
Application Notes
Description Version Size
AN4315 AN4315: BAL-NRF02D3 matched balun with integrated harmonics filter for Nordic Semiconductor chips with ultralow power transceivers 2.1 688 KB
AN2348 AN2348: IPAD™ 400 µm Flip Chip: package description and recommendations for use 5.0 261 KB
AN1235 AN1235: IPAD™ 500 µm Flip Chip: package description and recommendations for use 8.0 251 KB
Technical Notes & Articles
Description Version Size
TN1173 TN1173: Packing information for IPAD™, protection, rectifiers, thyristors and AC Switches 3.1 333 KB

Publications and Collaterals

Description Version Size
High-quality RF IPD baluns for ISM bands simplify RF complexity. 1.0 1 MB
IPADTM – integrated passive devices for RF applications 2.1 1 MB
Description Version Size
Products and Solutions for Factory Automation and Control 1.0 3 MB
Semiconductor solutions for healthcare applications 1.0 665 KB
Support & Community

Sample & Buy

Part Number Package Packing Type Minimum Sellable Quantity Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
BAL-2690D3U Chip Scale Package 0.4mm pitch Tape And Reel 5000 Active 0.168 1000 NEC EAR99 CHINA MORE INFO

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
BAL-2690D3U ActiveChip Scale Package 0.4mm pitchIndustrialEcopack2 0 0

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.