SST503 SOT-23 3L ROHS

Overview

The SST503 is a current regulating diode from the SST500 series, manufactured by Linear Integrated Systems in an SOT-23 3L package. It provides a nominal forward current of 0.56 mA with a range of 0.448 to 0.672 mA. Key electrical parameters include a peak operating voltage of 50 V, a reverse voltage of 0.8 V at 1 mA, and a dynamic impedance of 2.0 MΩ. The device operates within a junction temperature range of -55°C to +150°C and supports continuous power dissipation of 350 mW.

Feature Summary

• Requires no external biasing as gate-source voltage is zero
• Replaces legacy Siliconix/Vishay SST502 series components
• Features shorted pins 2 and 3 for simplified PCB trace routing

Applications

• Test instrumentation circuits
• Medical application electronics

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm compliance details. Confirm that the component matches the required current tolerance and package configuration before integration into production designs.

Selection Notes

Select this part based on the required nominal current of 0.56 mA and the need for high dynamic impedance. Ensure the circuit design accommodates the specified peak operating voltage and thermal derating requirements above 25°C.

Part Context

This component belongs to the SST500 series of current regulating diodes. The series offers a wide current range from 0.19 mA to 5.6 mA across multiple part numbers, all housed in the same SOT-23 3L package format.

Replacement Considerations

Officially documented to replace Siliconix/Vishay SST502 series devices. Verify pinout compatibility and thermal characteristics when substituting older inventory.