UM4310B

RF Diode Overview

The UM4310B is a switching and attenuator PIN diode from the UM4300 series, manufactured by Microsemi (now part of Microchip Technology). It features an extremely thick intrinsic region and low thermal resistance construction. The device offers high power capability with a maximum power dissipation of 20 W at 25°C pin temperature and a reverse voltage rating of 1000 V at 10 µA. 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 minimum 6.0 µs, and the I-region width is minimum 250 µm.

RF Diode Feature Summary

• Extremely low distortion performance suitable for linear attenuators
• High power dissipation capability up to 20 W
• Operates effectively in RF switching applications with low DC reverse bias
• Non-cavity design with thermally matched construction

RF Diode Applications

• RF Switching
• Linear RF Attenuators
• Specialized functions requiring low distortion below 500 kHz

RF Diode Procurement Notes

Verify the manufacturer origin as the datasheet is published by Microsemi Microwave Products. Confirm the specific package style (e.g., Style A, B, C, D, E, or SM) required for the application, as ratings vary by mounting condition. Ensure RoHS compliance requirements are met by specifying the UMX prefix if necessary, as standard versions may differ in environmental compliance.

RF Diode Selection Notes

Select the UM4310B over the UM7310 when higher power handling is critical, as the UM4300 series provides superior power dissipation compared to the lower capacitance UM7300 series. Consider the operating frequency range, as the device is designed for HF to beyond 1 GHz. Evaluate the thermal management strategy based on the specific package style's thermal impedance and power derating curves provided in the datasheet.

RF Diode Part Context

The UM4310B belongs to the UM4300 series of PIN diodes, which are distinguished by their large cross-sectional chip area for high power capability. This series is paired with the UM7300 series, which offers lower capacitance but reduced power handling. Both series share similar voltage ratings and structural designs but target different performance priorities in RF circuits.

RF Diode Replacement Considerations

For RoHS compliant versions, specify the UMX4310 variant. Direct functional substitutes within the same family include the UM7310 for lower capacitance needs, though power ratings will differ. Verify package compatibility if replacing across styles A through SM.