UM4001CR

RF Diode Overview

The UM4001CR is a high power PIN diode from the UM4000 series, manufactured by Microchip Technology. It features a silicon construction with long carrier lifetimes and thick I-regions, designed for HF through S band frequencies. The device has a reverse voltage rating of 100 V at 10 uA. Key electrical parameters include a maximum series resistance of 0.5 Ω at 100 MHz, a typical capacitance of 3 pF at 100 V reverse bias, and a carrier lifetime greater than 5 µs. The standard package 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.
• Low capacitance and low conductance at zero volts bias.

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 RoHS compliance status before procurement, as the standard UM4000 series utilizes a Sn/Pb finish which is not compliant. For RoHS compliant devices, the UMX prefix must be used (e.g., UMX4001). Confirm the specific package style required for the application, as the UM4000 series offers various mechanical configurations including stud and surface mount options.

RF Diode Selection Notes

Select the UM4001CR when a 100 V reverse voltage rating is sufficient for the circuit requirements. Consider the UM4900 series if higher power dissipation ratings are needed, as these devices offer superior thermal performance due to a shorter thermal path between the chip and package. Ensure the operating frequency falls within the HF to S band range where this component is optimized for low distortion switching.

RF Diode Part Context

The UM4001CR belongs to the UM4000 series of high power PIN diodes. This series is electrically equivalent to the UM4900 series but typically features lower power ratings due to differences in thermal path length. The UM4000 series is characterized by its use of silicon with long carrier lifetimes, making it suitable for high power RF applications requiring precise signal control.

RF Diode Replacement Considerations

The UM4901 is an electrically equivalent alternative within the same product family. The UM4901 offers higher power dissipation ratings compared to the UM4001 due to a shorter thermal path between the chip and package. Both devices share identical voltage ratings and core electrical characteristics.