UM4906C

RF Diode Overview

The Microchip Technology UM4906C is a high-power PIN diode from the UM4900 series, designed for HF through S-band applications. It features long carrier lifetimes and thick I-regions to handle high RF levels with low bias current. The device offers a reverse voltage rating of 600 V at 10 uA leakage current. Electrical parameters include a maximum series resistance of 0.5 Ohms at 100 mA forward current and 100 MHz frequency. Capacitance is typically 3 pF at 100 V reverse bias and 1 MHz. Carrier lifetime exceeds 5 µs. Power dissipation reaches 37.5 W with a thermal resistance of 4 °C/W at 25°C stud temperature.

RF Diode Feature Summary

• High power handling capability with short thermal path between chip and package
• Long carrier lifetime and high charge storage for efficient RF control
• Low capacitance and low conductance at zero bias voltage
• Compatible with automatic insertion equipment

RF Diode Applications

• Low distortion switches in HF through S band frequencies
• Attenuators requiring high RF level control
• UHF phase shifters and megawatt peak-power duplexers
• Antenna selectors and couplers

RF Diode Procurement Notes

Verify RoHS compliance status when ordering, as standard finishes differ from compliant versions. Confirm specific package style availability (e.g., Stud or Surface Mount) against schematic requirements. Check datasheet for absolute maximum ratings regarding pulse conditions and thermal impedance curves to ensure safe operation within system constraints.

RF Diode Selection Notes

Select the UM4906C over the UM4006 series when higher power dissipation ratings are required due to its superior thermal characteristics. Ensure the 600 V reverse voltage rating meets the peak RF voltage expectations of the application. Consider the specific mechanical style (Stud vs. Surface Mount) based on board layout and mounting hardware compatibility.

RF Diode Part Context

The UM4906C belongs to the UM4900 series of high-power PIN diodes manufactured by Microsemi (now part of Microchip Technology). This series is electrically equivalent to the UM4000 series but provides enhanced power ratings through optimized thermal paths. The component is widely used in microwave and radio frequency engineering for signal switching and attenuation.

RF Diode Replacement Considerations

The UM4006 is an electrically equivalent alternative within the same family but has lower power dissipation ratings. For RoHS compliant replacements, verify if the UMX prefix variant is available and suitable for the specific thermal and mechanical requirements.