SMP1331-085LF

RF Diode Overview

The SMP1331-085LF is a surface-mountable, low capacitance silicon PIN diode designed for shunt-connected high-power applications from 10 MHz to beyond 6 GHz. It features a maximum reverse voltage of 200 V and a forward current rating of 200 mA at 25 °C. The device has a typical capacitance of 0.35 pF at 30 V reverse bias and a series resistance of 0.5 Ω at 100 mA forward current. It supports a continuous wave power dissipation of 2.5 W at 85 °C and operates within an ambient temperature range of -40 °C to +150 °C.

RF Diode Feature Summary

• Low thermal resistance of 28 °C/W suitable for 50 W Continuous Wave T/R switches
• Low capacitance of 0.35 pF with nominal 30 µm I-region width
• QFN (3-pin, 2 × 2 mm) package with exposed paddle for minimal parasitic inductance

RF Diode Applications

• Low-loss, high-power switches
• Low distortion attenuators
• Shunt-connected transmit/receive (T/R) switch circuits

RF Diode Procurement Notes

Verify the component status as End-of-Life (EOL) before procurement planning. Confirm that the ordering suffix does not alter the electrical function or package type unless explicitly documented by the manufacturer. Ensure compliance with RoHS3 specifications and Moisture Sensitivity Level 1 (MSL1) handling requirements during storage and soldering processes.

RF Diode Selection Notes

Select this component for designs requiring high power handling in a small footprint. The exposed copper paddle must be connected to system ground via multiple vias to minimize both electrical inductance and thermal resistance. Verify that the PCB layout matches the recommended footprint dimensions to ensure proper heat dissipation and electrical performance.

RF Diode Part Context

This part belongs to the Skyworks SMP1331 series of surface mount PIN diodes. It is specifically engineered for shunt configurations in high-volume switch and attenuator applications. The design utilizes a QFN package to reduce parasitic inductance compared to traditional surface mount packages, enhancing performance in large signal switching environments.

RF Diode Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.