UM4301D

RF Diode Overview

The UM4301D is a switching and attenuator PIN diode from the UM4300 series, manufactured by Microsemi. It features an extremely thick intrinsic region and low thermal resistance construction, designed for very low distortion linear attenuators and specialized functions. The device offers high power capability with a maximum power dissipation of 15 W in the D package style at 25°C stud temperature. It has a reverse voltage rating of 100 V at 10 uA leakage current. Key electrical characteristics include a maximum series resistance of 1.5 Ohms at 100 mA forward current and 100 MHz frequency, and a maximum capacitance of 2.2 pF at 100 V reverse bias and 1 MHz frequency. The carrier lifetime is a minimum of 6.0 us.

RF Diode Feature Summary

• Extremely low distortion performance suitable for linear attenuators
• High power dissipation capability up to 20 W for the series
• Low thermal resistance construction for efficient heat management
• Operable as RF switches at low DC reverse bias voltages

RF Diode Applications

• RF Switching
• Linear RF Attenuators
• Specialized microwave functions operating from HF to beyond 1 GHz

RF Diode Procurement Notes

Verify the specific package style suffix 'D' corresponds to the required mechanical dimensions and mounting configuration. Confirm RoHS compliance requirements; if compliant packaging is necessary, specify the UMX4301 variant instead of the standard UM4301. Consult the manufacturer's website for the most current datasheet revisions and availability status before finalizing procurement orders.

RF Diode Selection Notes

Select the UM4301D when high power handling and low distortion are critical for attenuator applications. Compare against the UM7301 if lower capacitance is prioritized over power dissipation. Ensure the operating frequency range aligns with the device's transit time characteristics below 5 MHz for optimal linearity. Verify that the thermal management solution supports the specified power dissipation ratings for the chosen package style.

RF Diode Part Context

The UM4301D belongs to the UM4300 series of switching and attenuator PIN diodes produced by Microsemi's Microwave Products division. This series is characterized by diode chips with extremely thick intrinsic regions, distinguishing them from standard switching diodes. The UM4300 series specifically targets applications requiring the highest power capability within the family, contrasting with the UM7300 series which focuses on lower capacitance.

RF Diode Replacement Considerations

For RoHS compliant versions, consider the UMX4301D. Direct functional substitutes from other manufacturers are not explicitly listed in the provided documentation; consult Microsemi for approved alternatives.