BB179,315

Overview

The BB179,315 is a UHF variable capacitance diode fabricated using planar technology and encapsulated in the SOD523 (SC-79) ultra-small surface-mount plastic package. It utilizes Direct Matching Assembly (DMA) to achieve excellent matching performance with a tolerance of ±2%. The device exhibits high linearity and a typical capacitance ratio (Cd(1V)/Cd(28V)) of 9. Key electrical parameters include a capacitance at 28V (Cd(28V)) of 2.1 pF and low series resistance, making it suitable for precision tuning applications in UHF circuits.

Feature Summary

• Planar technology fabrication for consistent performance
• Direct Matching Assembly (DMA) ensures ±2% matching accuracy
• Ultra-small SOD523 leadless surface-mount package
• High linearity with a typical capacitance ratio of 9

Applications

• Voltage Controlled Oscillators (VCO)
• Electronic tuning in UHF television tuners

Procurement Notes

Verify the specific suffix against current NXP documentation, as the base model may be discontinued or superseded by variants like BB179B or BB179BLX. Confirm the package type matches the required PCB footprint, typically SOD523 for this family. Ensure the DMA matching grade meets circuit requirements before ordering.

Selection Notes

Select this component when space-constrained designs require precise UHF tuning capabilities. The SOD523 package offers a compact form factor compared to larger through-hole alternatives. Verify that the 2.1 pF minimum capacitance and 9:1 ratio align with the oscillator's frequency range and tuning linearity specifications.

Part Context

This component belongs to NXP's legacy portfolio of UHF varactor diodes designed for RF tuning applications. It is part of a broader family including BB149 and BB159, sharing similar functional principles but differing in packaging and specific electrical tolerances. The BB179 series is engineered for cost-effective integration into consumer electronics requiring reliable frequency control.

Replacement Considerations

Publicly confirmed direct substitutes are not explicitly listed in the provided source material. Designers should evaluate equivalent varactors from other manufacturers based on matching the SOD523 package, capacitance range, and reverse voltage ratings.