SST511 SOT-23 3L ROHS

Overview

The SST511 is a current regulating diode from the SST500 series by Linear Integrated Systems, designed for stable current source applications. It operates within a wide voltage range without requiring external biasing circuits. The device maintains a nominal forward current of 4.7 mA, with a minimum of 3.8 mA and a maximum of 5.6 mA. Key electrical characteristics include a dynamic impedance of 0.2 mΩ and a knee impedance of 0.03 mΩ at a limiting voltage of 2.1 V. It features a peak operating voltage of 50 V, continuous power dissipation of 350 mW, and operates across a junction temperature range of -55°C to +150°C.

Feature Summary

• Maintains constant current over a wide voltage range without external biasing
• Direct replacement for Siliconix/Vishay SST502 series components
• Zero temperature coefficient operation
• Requires no power supplies or additional circuitry

Applications

• Test instrumentation
• Medical equipment
• Sensor biasing circuits
• LED driving applications

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and compliance status. Ensure the component matches the required forward current tolerance and impedance specifications for the target application. Confirm that pins 2 and 3 are shorted via PCB trace as per the standard SOT-23 3L configuration.

Selection Notes

Select the SST511 when a nominal regulation current near 4.7 mA is required. Consider the dynamic impedance and limiting voltage parameters to ensure proper operation within the circuit's voltage headroom. Verify that the continuous power dissipation limits are not exceeded under maximum ambient temperature conditions.

Part Context

The SST511 belongs to the SST500 series of current regulating diodes manufactured by Linear Integrated Systems. This series provides a broad range of regulated currents from 0.192 mA to 5.6 mA in a compact SOT-23 3L surface-mount package. The devices are designed to replace older discrete solutions and offer improved consistency and performance.

Replacement Considerations

The SST511 serves as a direct replacement for the discontinued Siliconix/SST502 series components. When substituting, verify that the new part meets the original design requirements for forward current, dynamic impedance, and physical footprint compatibility.

FAQ

How should the pins be configured on the SST511?

Pins 2 and 3 must be shorted together, typically via a PCB trace, to properly configure the device for operation.

What is the maximum peak operating voltage for this component?

The maximum peak operating voltage (POV) is 50 V.

Does the SST511 require an external bias voltage to function?

No, the device does not require external biasing; it operates with VGS = 0V.