UM4301C

RF Diode Overview

The UM4301C 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 20 W at a stud temperature of 25 °C. 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 MHz and a maximum capacitance of 2.2 pF at 1 MHz. The carrier lifetime is a minimum of 6.0 us, ensuring transit time frequencies below 5 MHz for low distortion performance.

RF Diode Feature Summary

• Extremely low distortion performance suitable for linear attenuators
• High power dissipation capability up to 20 W in stud packages
• 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 (e.g., C or D) required for your thermal and mechanical constraints, as power ratings vary significantly between stud configurations. Confirm RoHS compliance requirements; if lead-free packaging is mandatory, specify the UMX4301 variant instead of the standard UM4301. Ensure the selected package matches the mounting method and thermal interface specifications provided in the datasheet diagrams.

RF Diode Selection Notes

Select the UM4301C over the UM7301 series when higher power handling is prioritized over lower capacitance. The UM4300 series provides superior power dissipation capabilities compared to the UM7300 series. Consider the available package styles (A, B, C, D, E, SM) based on the required thermal impedance and physical mounting constraints. Verify that the operating frequency range aligns with the device's low distortion characteristics below 5 MHz transit time limits.

RF Diode Part Context

The UM4301C belongs to the UM4300 series of PIN diodes, which are characterized by large cross-sectional chip areas for maximum power capability. This series is distinct from the UM7300 series, which offers lower capacitance but reduced power handling. Both series share the same fundamental design philosophy of combining thick intrinsic regions with low thermal resistance to achieve high linearity and robustness in RF applications.

RF Diode Replacement Considerations

For RoHS compliant versions, use the UMX4301C part number. Direct functional substitutes within the same family include other UM4300 series variants with different voltage ratings (e.g., UM4302, UM4306) if voltage requirements differ. No other manufacturer equivalents are confirmed in the source data.