SMV1255-079LF

Overview

The SMV1255-079LF is a silicon hyperabrupt junction tuning varactor diode from Skyworks Solutions, designed for Voltage Controlled Oscillators (VCOs) requiring low tuning voltage operation. It is housed in an SC-79 package with a series inductance of 0.7 nH. The device operates within a temperature range of -55°C to +125°C and features a minimum reverse voltage of 15 V and a maximum forward current of 20 mA. At 4.7 V, the typical capacitance is 5.8 pF, while at 0.3 V it reaches 64 pF. The typical capacitance ratio (C0.3V/C4.7V) is 12, and the series resistance at 3 V and 500 MHz is 1.0 Ω.

Feature Summary

• Hyperabrupt junction design optimized for high capacitance ratio
• Low series resistance supporting low phase noise applications
• Moisture Sensitivity Level 1 rated for lead-free soldering

Applications

• Low tuning voltage Voltage Controlled Oscillators (VCOs)
• High-volume commercial wireless systems
• High-Q resonators in RF circuits

Procurement Notes

Verify component authenticity through authorized channels as this part is subject to discontinuation notices. Confirm RoHS compliance status via the manufacturer's Certificate of Conformance before integration. Ensure handling procedures strictly follow ESD protection guidelines to prevent damage during assembly and storage.

Selection Notes

Select this component when a higher zero-bias capacitance is required compared to lower-numbered variants in the SMV1247-SMV1255 series. The SC-79 package provides a specific footprint suitable for compact designs. Verify that the 0.7 nH series inductance aligns with the target frequency response and impedance matching requirements of the circuit.

Part Context

This component belongs to the SMV1247-SMV1255 family of silicon hyperabrupt junction varactors. These devices are characterized for capacitance and resistance over temperature variations. The series offers multiple package options including SOT-23, SOD-323, and SC-79, providing flexibility for various surface mount layouts.

Replacement Considerations

SMV1255-040LF: Identical electrical characteristics but utilizes an SOD-882 package instead of SC-79.