SST506 SOT-23 3L

Overview

The SST506 is a silicon current regulating diode from the SST500 series, manufactured by Linear Integrated Systems. It provides a nominal forward current of 1.4 mA with a maximum limit of 1.68 mA and a minimum of 1.12 mA. The device operates within a peak voltage of 50 V and features a dynamic impedance of 0.8 MΩ at 25 V and a knee impedance of 0.2 MΩ at 6 V. Packaged in a compact SOT-23-3L form factor, it supports junction temperatures from -55°C to +150°C and dissipates up to 350 mW continuously.

Feature Summary

• Maintains constant current without external biasing circuits
• Replaces legacy Siliconix/Vishay SST502 series components
• Suitable for high-reliability medical and test instrumentation applications

Applications

• Test instrumentation current sources
• Medical equipment biasing
• Sensor circuit stabilization

Procurement Notes

Verify the manufacturer designation as Linear Integrated Systems when sourcing this component. Confirm the package type is SOT-23-3L and that pins 2 and 3 are shorted internally or via PCB trace as required. Ensure RoHS compliance matches project specifications. Cross-reference datasheet revision A5 for accurate electrical limits.

Selection Notes

Select the SST506 when a stable 1.4 mA current source is required in a low-profile surface-mount package. This part is appropriate for designs needing wide operating voltage ranges up to 50 V without additional active components. Consider thermal derating above 25°C if power dissipation approaches the 350 mW limit.

Part Context

This component belongs to the SST500 series of current regulating diodes designed to replace older discrete solutions. The series offers various current options ranging from 0.192 mA to 5.6 mA in a standardized SOT-23-3L package. These devices simplify circuit design by eliminating the need for complex biasing networks typically required for constant current generation.

Replacement Considerations

Officially documented to replace the Vishay/Siliconix SST502 series. Verify pinout compatibility, specifically the requirement to short pins 2 and 3, when substituting into existing layouts.

FAQ

How should the pins be connected on the SST506?

Pins 2 and 3 must be shorted together, either internally or via a PCB trace, to ensure proper operation.

What is the maximum power dissipation rating?

The continuous power dissipation is 350 mW at 25°C, requiring a derate of 2.8 mW/°C above that temperature.

Does the SST506 require an external bias voltage?

No, the device requires no external biasing (VGS = 0V) to regulate current.