SMV1255-040LF

Overview

The SMV1255-040LF is a silicon hyperabrupt junction tuning varactor diode from the Skyworks SMV1247-SMV1255 series, designed for Voltage Controlled Oscillators (VCOs) requiring low tuning voltage operation. It is housed in an SC-79 package with a typical series inductance of 0.7 nH. The device features a maximum reverse voltage of 15 V and operates within a temperature range of -55°C to +125°C. At 0.3 V, the capacitance typically ranges from 58.0 pF to 64 pF, dropping to approximately 43.3 pF at 1 V. The component exhibits a typical capacitance ratio of 12 between 0.3 V and 4.7 V.

Feature Summary

• Hyperabrupt junction design optimized for high capacitance ratios
• Low series resistance characteristics suitable for low phase noise applications
• Moisture Sensitivity Level 1 rated for standard soldering processes

Applications

• Voltage Controlled Oscillators (VCOs)
• High-volume commercial systems
• Electronically tunable filters

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and compliance status. Confirm RoHS or Green packaging requirements prior to procurement. Check for current product discontinuation notifications as availability may be restricted. Ensure ESD handling precautions are followed during storage and assembly.

Selection Notes

Select this component when a higher baseline capacitance is required compared to lower-numbered variants in the series. Verify that the SC-79 package dimensions align with the target PCB layout. Ensure the operating tuning voltage remains within the specified range to maintain the expected capacitance ratio and Q factor performance.

Part Context

This part belongs to the SMV1247-SMV1255 family of silicon hyperabrupt junction varactors. These devices share common electrical characteristics but differ in nominal capacitance values and physical packages. The SMV1255 variant provides the highest capacitance in the group, making it distinct from lower-capacitance counterparts like the SMV1247 or SMV1253.

Replacement Considerations

Direct replacements within the same series include other SMV1255 variants such as SMV1255-079LF or SMV1255-011LF, which offer different package footprints while maintaining identical electrical specifications.