BB156/DG/B2

Overview

The BB156 is a low-voltage variable capacitance diode manufactured by NXP Semiconductors. It utilizes planar technology and is housed in the SOD323 plastic surface-mounted device package, which measures 4.8 mm in length. The component features excellent linearity and very low series resistance, making it suitable for precision tuning applications. Key electrical parameters include a capacitance value of 4.8 pF at 0 V reverse bias voltage and a capacitance ratio of 3.3 at a reverse voltage change from 0 V to 20 V. The marking code on the package is PF, with the bar indicating the cathode.

Feature Summary

• Excellent linearity characteristics
• Very small plastic SMD package C7.5
• Very low series resistance

Applications

• Voltage controlled oscillators (VCO)

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package variant and tape-and-reel specifications. Ensure the component meets RoHS compliance requirements as defined in the product specification. Confirm availability through authorized NXP distribution channels or verified distributors. Check for any superseded data sheets that may affect design-in parameters.

Selection Notes

Select this component for circuits requiring low-voltage varactor functionality with minimal parasitic resistance. The SOD323 package is appropriate for space-constrained designs. Evaluate the 4.8 pF initial capacitance and 3.3 ratio against the required tuning range of the target oscillator circuit. Ensure the operating voltage remains within the specified limits to maintain linearity.

Part Context

The BB156 belongs to the discrete semiconductor category, specifically within the variable capacitance diode family. It is designed for RF and microwave applications where precise frequency control is necessary. The component represents a standard solution for tuning elements in communication systems and signal generation circuits.

Replacement Considerations

Consult official substitution lists for equivalent varactor diodes with similar capacitance ratios and package dimensions. Verify pinout compatibility and thermal characteristics before replacing the original component.