SMP1330-085LF

RF Diode Overview

The SMP1330-085LF is a surface-mountable, low-capacitance silicon PIN limiter diode designed for shunt-connected high-power limiter applications up to 6 GHz. It features a maximum series resistance of 2 Ω at 10 mA and a maximum capacitance of 0.55 pF at 0 V. The device operates within an ambient temperature range of -55 °C to +150 °C and withstands a reverse voltage of up to 50 V. Packaged in a 3-pin QFN (2 x 2 mm) format with Moisture Sensitivity Level 1, it provides a typical threshold level of +9 dBm at 1 GHz.

RF Diode Feature Summary

• Low thermal resistance design utilizing a copper ground paddle to minimize junction temperature
• Ultra-miniature QFN package reduces parasitic inductance effects compared to other surface mount packages
• Gold-doped thin base limiter chip technology ensures low loss and low distortion performance

RF Diode Applications

• High power limiters
• Receiver protectors

RF Diode Procurement Notes

Verify the component against the official Skyworks Solutions Inc. datasheet dated June 25, 2020. Confirm that the part number matches the specific ordering suffix required for tape and reel packaging. Ensure compliance with RoHS3 specifications and verify the absence of halogens as defined by the manufacturer's Green product standards before finalizing procurement.

RF Diode Selection Notes

Select this component for shunt-connected applications requiring effective receiver protection in wireless systems. The device is suitable for large signal limiter circuits operating up to 6 GHz. Designers must provide a complete path for DC current flow using an RF choke or similar structure to enable proper limiting action during high-power input events.

RF Diode Part Context

This device belongs to the SMP1330 series of plastic-packaged limiter diodes manufactured by Skyworks Solutions Inc. The series utilizes Alpha’s limiter diode technology to produce gold doped thin base chips. These devices are characterized specifically for limiter circuits to ensure consistent performance across production batches.

RF Diode Replacement Considerations

SMP1330-085-EVB is listed as the corresponding evaluation board for this component.

RF Diode FAQ

How does the SMP1330-085LF handle large input signals?

When a large input signal is present, the impedance of the diode drops significantly, creating an impedance mismatch that reflects most of the input signal power back toward its source.

What is the purpose of the exposed paddle on Pin 2?

The cathode of the die is soldered directly to the top of the exposed copper paddle on Pin 2 to minimize total thermal resistance between the I layer and the external environment.

Is a DC block capacitor required in the circuit?

DC block capacitors are optional; they serve to protect the limiter diode from external DC voltage that may be present in the source or load circuits.