UM4001D

RF Diode Overview

The UM4001D is a high-power silicon PIN diode from the UM4000 series, manufactured by Microchip Technology. It features an isolated stud package (Style D) with a voltage rating of 100 V at 10 uA reverse current. The device has a maximum power dissipation of 18.75 W at a 25°C stud temperature and a thermal resistance of 8°C/W. Electrical characteristics include a typical series resistance of 0.5 Ω at 100 MHz, a capacitance of 3 pF at 100 V reverse bias, and a carrier lifetime exceeding 5 µs. The standard finish is Sn/Pb.

RF Diode Feature Summary

• High charge storage and long carrier lifetime enable control of high RF levels with relatively low bias current.
• Peak RF voltages can be handled well in excess of applied reverse bias voltage.
• Non-cavity design with thermally matched configuration for reliable performance.
• Compatible with automatic insertion equipment.

RF Diode Applications

• Low distortion switches and attenuators in HF through S band frequencies.
• High power UHF phase shifters and megawatt peak-power duplexers.
• Antenna selectors and couplers where inductance and capacitance elements are switched in filter or cavity networks.

RF Diode Procurement Notes

Verify the specific ordering suffix to confirm the package style and compliance status. The UM4000 series typically utilizes a Sn/Pb finish; RoHS compliant versions require the UMX prefix. Confirm that the requested part number matches the required thermal path and mounting specifications for the intended application environment.

RF Diode Selection Notes

Select the UM4001D when a 100 V reverse voltage rating is required alongside high power handling capabilities. The Style D package provides a direct thermal path to the stud, suitable for applications requiring efficient heat dissipation. Ensure the operating frequency range aligns with the diode's low capacitance and series resistance characteristics for optimal switching performance.

RF Diode Part Context

The UM4001D belongs to the UM4000 series of high power PIN diodes. This series is electrically equivalent to the UM4900 series but generally offers lower power ratings due to a longer thermal path between the chip and package. Both series share similar electrical parameters such as voltage ratings and carrier lifetimes.

RF Diode Replacement Considerations

The UM4901D is an electrically equivalent alternative within the UM4900 series, offering higher power ratings due to a shorter thermal path. For RoHS compliance, consider the UMX4001D variant which meets EU Directive 2002/95/EC requirements.