SMV1249-011LF

Overview

The SMV1249-011LF 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 features a single configuration in an SOD-323 package with a parasitic series inductance of 1.5 nH. The device operates within a reverse voltage range up to 15 V and a forward current limit of 20 mA. At 1 V reverse bias, it exhibits a typical capacitance of 18.18 pF, dropping to 3.40 pF at 3 V. The component maintains a high capacitance ratio of approximately 12:1 between 0.3 V and 4.7 V, ensuring effective frequency tuning capabilities.

Feature Summary

• Hyperabrupt junction design optimized for low tuning voltage applications
• High capacitance ratio providing efficient frequency modulation
• Single configuration housed in industry-standard SOD-323 surface mount package

Applications

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

Procurement Notes

Verify the specific ordering suffix against official Skyworks documentation to confirm package type and compliance status. Confirm that the procurement channel provides valid traceability for the lead-free RoHS-compliant designation. Ensure handling procedures strictly follow ESD protection guidelines during storage and assembly to prevent damage to the semiconductor junction.

Selection Notes

Select this component when a moderate capacitance value around 18 pF at 1 V is required for VCO designs. The SOD-323 package suits space-constrained PCB layouts. Verify that the 15 V reverse voltage rating aligns with the circuit's maximum operating conditions. Consider the 1.5 nH series inductance impact on high-frequency performance relative to alternative packages in the same series.

Part Context

This part belongs to the SMV1247-SMV1255 family of silicon hyperabrupt junction varactors. These devices share similar electrical characteristics but differ in nominal capacitance values and physical package outlines such as SC-79, SOT-23, and SOD-882. The SMV1249 specifically offers a mid-range capacitance profile within this lineup, balancing tuning range and absolute capacitance for standard RF oscillator applications.

Replacement Considerations

Direct substitutes within the same Skyworks series include SMV1247-011LF, SMV1248-011LF, SMV1251-011LF, SMV1253-011LF, and SMV1255-011LF. These alternatives maintain identical packaging and pinout configurations while offering different capacitance values. Cross-manufacturer replacements require careful verification of capacitance ratios and parasitic parameters.