BB178,315

Overview

The BB178,315 is a varactor diode manufactured by NXP Semiconductors. It is housed in an SC-79-2 (SOD-323) surface-mount package and operates within a temperature range of -55°C to +125°C. Key electrical specifications include a maximum reverse voltage of 32 V and a capacitance of 34.65 pF. The device features a single configuration with a minimum tuning ratio of 13.5, tested under conditions of 1 V to 28 V. This component is part of the Diodes & Rectifiers subcategory and is designed for RF applications requiring variable capacitance control.

Feature Summary

• Provides variable capacitance for RF circuit tuning
• Operates reliably across extended industrial temperature ranges
• Designed for compact surface-mount integration

Applications

• RF filter tuning circuits
• Voltage-controlled oscillators (VCOs)
• Frequency synthesizers

Procurement Notes

Verify the specific suffix against official documentation, as variations may indicate different packaging or tape-and-reel configurations. Confirm current availability status directly with authorized distributors, as lifecycle changes can affect supply chain continuity. Ensure compliance with RoHS directives relevant to the manufacturing date code.

Selection Notes

Select this component when a low-capacitance varactor is required for high-frequency applications. Compare the 34.65 pF baseline capacitance and 32 V reverse voltage limits against circuit requirements. Evaluate the SC-79-2 package dimensions for PCB layout compatibility and ensure the operating temperature range meets environmental constraints.

Part Context

This part belongs to NXP's portfolio of RF discrete semiconductors. Varactor diodes are essential passive-active components used to adjust resonance frequencies in radio frequency systems without mechanical parts. The BB178 series is widely recognized for its stability and linearity in communication equipment.

Replacement Considerations

Check for direct substitutes from NXP or other manufacturers offering identical SC-79-2 packages and similar capacitance-voltage characteristics. Verify that alternative parts meet the same 32 V reverse voltage and temperature specifications.