ST Life.augmented


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

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 performances.

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Errata Sheet
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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
  • BenefitsVery low profile (<700 μm)High RF performancesRF BOM and area reduction

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS6408: 50 / 30+j25 balun transformer for 2.45 GHz ISM band
2.1 258 KB

Application Notes

Description Version Size
AN1235: IPAD™ 500 µm Flip Chip: package description and recommendations for use
8.0 252 KB
AN2348: IPAD™ 400 µm Flip Chip: package description and recommendations for use
5.0 262 KB

Publications and Collaterals


Description Version Size
IPADTM – integrated passive devices for RF applications
1.0 1,303 KB


Description Version Size
Semiconductor solutions for healthcare applications
1.0 665 KB

Sample & Buy

Part Number Marketing StatusPackagePacking TypeAutomotive GradeOrder From STUnit Price (US$)*
@ 5000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
BAL-2690D3UActiveFlip-Chip 400uTape And Reel_-.168No availability reported, please contact our Sales officeEcopack2PDF

(*) 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
(**) The Material Declaration forms available on 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.
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