SMV1249-079LF

Overview

The SMV1249-079LF is a silicon hyperabrupt junction tuning varactor diode designed for Voltage Controlled Oscillators (VCOs) requiring low tuning voltage operation. It features a typical capacitance ratio of 12 at C0.3V/C4.7V and an inductance of 0.7 nH. The device operates within a reverse voltage range up to 15 V and supports forward currents up to 20 mA. Electrical specifications include a maximum series resistance of 5.3 Ω at 3 V and 500 MHz, with a quality factor of 600 at 3 V and 50 MHz. Operating temperatures span from -55 °C to +125 °C.

Feature Summary

• Hyperabrupt junction design optimized for low tuning voltage VCO applications
• High capacitance ratio of 12 typical at C0.3V/C4.7V conditions
• Low parasitic series inductance of 0.7 nH for improved RF performance

Applications

• Voltage Controlled Oscillators (VCOs)
• Low tuning voltage systems
• High-volume commercial electronic systems

Procurement Notes

Verify the component against official Skyworks Solutions datasheet specifications before integration. Confirm that the SC-79 package marking matches 'Cathode and EH' to ensure correct part identification. Check for RoHS compliance documentation as required by project standards. Ensure handling procedures account for ESD sensitivity during assembly.

Selection Notes

Select this component when a high capacitance ratio is required for wide tuning ranges in VCO designs. The 0.7 nH series inductance makes it suitable for higher frequency applications compared to variants with higher inductance. Verify that the 15 V reverse voltage rating aligns with the circuit's biasing requirements.

Part Context

This component belongs to the SMV1247-SMV1255 series of silicon hyperabrupt junction varactors. These devices are characterized for capacitance and resistance over temperature to support reliable VCO performance. The series includes various packages, with the SMV1249-079LF specifically utilizing the SC-79 form factor.

Replacement Considerations

Other members of the SMV1247-SMV1255 series may serve as alternatives if electrical parameters like capacitance or Q-factor differ sufficiently. Variants such as SMV1248-079LF or SMV1251-079LF offer different capacitance values but share similar packaging and characteristics.