UM4302B

RF Diode Overview

The UM4302B is a switching and attenuator PIN diode from the UM4300 series, manufactured by Microsemi. It features an extremely thick intrinsic region for low distortion linear attenuation and specialized RF functions. The device offers high power capability with a maximum power dissipation of 20 W at 25°C pin temperature and 10 W at 25°C contact free air. It has a reverse voltage rating of 200 V at 10 uA leakage current. Key electrical parameters include a maximum series resistance of 1.5 Ohms at 100 MHz and a maximum capacitance of 2.2 pF at 100 V reverse bias. The carrier lifetime is minimum 6.0 us, and the I-region width is minimum 250 um.

RF Diode Feature Summary

• Extremely low distortion performance suitable for linear attenuators
• High power dissipation capability up to 20 W
• Low capacitance design for high-frequency operation
• Thermally matched construction with low thermal resistance

RF Diode Applications

• RF Switching
• Linear RF Attenuators
• Specialized RF Functions below 1 GHz

RF Diode Procurement Notes

Verify the specific package style (e.g., A, B, C, D, E, SM) required for the application, as the base part number UM4302B covers multiple mechanical configurations. Confirm RoHS compliance requirements; if compliant packaging is needed, specify the UMX4302 variant. Check datasheet for exact thermal derating curves based on the chosen mounting method and ambient conditions.

RF Diode Selection Notes

Select the UM4302B when a 200 V reverse voltage rating is sufficient and high power handling is required. Compare against the UM7302 series if lower capacitance is prioritized over power dissipation. Ensure the operating frequency range aligns with the diode's transit time characteristics, which support frequencies below 1 GHz with minimal distortion.

RF Diode Part Context

The UM4302B belongs to the UM4300 series of PIN diodes designed for microwave applications. This series is characterized by a large cross-sectional chip area, providing superior power handling compared to the UM7300 series. It is intended for use in circuits requiring low distortion attenuation or switching capabilities in the HF to VHF/UHF range.

RF Diode Replacement Considerations

For RoHS compliant versions, consider the UMX4302 series. Direct functional substitutes from other manufacturers are not explicitly listed in the provided documentation; consult Microsemi for approved alternatives.