HSMS-285B-TR1G

RF Diode Overview

The HSMS-285B-TR1G is a surface-mount zero bias Schottky detector diode from the HSMS-285x series, manufactured by Broadcom Limited. It is optimized for small signal applications with input power below -20 dBm at frequencies under 1.5 GHz. The device features a single diode configuration in an SOT-323 package. Key electrical specifications include a maximum peak inverse voltage of 2.0 V, a typical forward voltage of 150 mV at 0.1 mA, and a reverse leakage current of 250 µA at 2 V. Junction capacitance is typically 0.30 pF at -0.5 V to -1.0 V. RF performance metrics at 915 MHz include a typical tangential sensitivity of -57 dBm, voltage sensitivity of 40 mV/µW, and video resistance of 8.0 kΩ.

RF Diode Feature Summary

• High detection sensitivity up to 50 mV/µW at 915 MHz
• Low flicker noise characteristics (-162 dBV/Hz at 100 Hz)
• Matched diodes ensure consistent performance within packages
• Lead-free construction compliant with environmental standards

RF Diode Applications

• RFID (Radio Frequency Identification) systems
• RF Tag applications without primary DC bias
• Small signal crystal video receivers
• Zero bias Schottky detector circuits below 1.5 GHz

RF Diode Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm lot traceability and RoHS compliance status upon receipt. Check for moisture sensitivity level indicators on packaging. Ensure handling procedures follow ESD precautions as specified in application notes. Validate part marking codes against datasheet identifiers to prevent counterfeit substitution.

RF Diode Selection Notes

Select this component for low-power RF detection where external bias is unavailable. Ensure input signals remain below -20 dBm to maintain optimal linearity; higher power levels require alternative series like HSMS-282x or HSMS-286x. Consider thermal resistance constraints for high-density layouts. Verify impedance matching network requirements based on the specific operating frequency and video bandwidth needs.

RF Diode Part Context

This device belongs to the HSMS-285x family of surface mount zero bias Schottky detector diodes. The series includes various configurations such as single diodes (HSMS-285B), series pairs (HSMS-285C), unconnected trios (HSMS-285L), and bridge quads (HSMS-285P). All variants share similar core semiconductor characteristics but differ in internal connectivity and package pinout arrangements to suit different circuit topologies.

RF Diode Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. For higher input power applications exceeding -20 dBm, the HSMS-282x series (below 4.0 GHz) or HSMS-286x series (above 4.0 GHz) are recommended alternatives.

RF Diode FAQ

What is the maximum recommended input power for the HSMS-285B?

The HSMS-285B is designed for small signal applications with input power levels below -20 dBm. Using it for higher power levels is not recommended.

How does the flicker noise performance compare to other Schottky diodes?

The HSMS-285x series exhibits low flicker noise, specifically -162 dBV/Hz at 100 Hz, which helps maintain sensitivity in crystal video receivers.

What is the typical video resistance at 915 MHz?

The typical video resistance (RV) for the HSMS-285B at 915 MHz is 8.0 kΩ when tested with zero bias and a 100 kΩ load.