BB179B,135

Overview

The BB179B,135 is a UHF variable capacitance diode fabricated using planar technology and encapsulated in the SOD523 (SC-79) ultra-small surface-mount plastic package. This component utilizes Direct Matching Assembly (DMA) procedures to achieve excellent matching performance. The specific suffix ',135' indicates that the device is supplied on a tape reel with standard product orientation. As a discontinued product, this information serves for historical reference regarding its physical construction and packaging configuration.

Feature Summary

• Fabricated in planar technology for consistent electrical characteristics
• Encapsulated in an ultra-small SMD plastic package for space-constrained designs
• Utilizes Direct Matching Assembly (DMA) procedure to ensure high matching precision

Applications

• UHF frequency tuning circuits
• RF varactor applications requiring small form factor
• Historical base station or communication equipment design

Procurement Notes

This component is officially classified as No Longer Manufactured by NXP Semiconductors. Specifications provided are available strictly for historical reference. Verification of original datasheet Rev 3.0 dated September 5, 2011, confirms the SOD523 package and DMA matching process. Buyers should confirm availability through secondary markets or authorized distributors holding legacy stock, as direct manufacturing supply has ceased.

Selection Notes

Designers requiring a replacement must evaluate current NXP UHF varactor portfolios for equivalent capacitance ranges and package compatibility. The SOD523 footprint requires careful PCB layout adaptation if substituting with larger packages. Verify that alternative components support the required reverse voltage and Q-factor specifications for the target UHF application environment.

Part Context

The BB179B belongs to NXP's legacy portfolio of UHF variable capacitance diodes. It was designed for RF tuning applications where precise capacitance control at ultra-high frequencies was necessary. The component represents a transition toward miniaturized surface-mount solutions in RF front-end modules before more advanced integrated tuning architectures became prevalent.

Replacement Considerations

Public confirmed substitute part numbers are not explicitly listed in the provided documentation. Engineers should consult NXP's current UHF varactor selection guides for equivalents such as the BB179BLX series or modern SOD523-compatible alternatives with similar C-V characteristics.