J503 TO-92 2L

Current Regulation - Diodes, Transistors Overview

The J503 is a current-regulating diode (CRD) from the SST500 series by Linear Integrated Systems, designed to maintain a stable forward current within a wide voltage range without external biasing. It operates in a TO-92-2L package with two active leads. The nominal forward current is 0.448 mA, with a typical dynamic impedance of 2 mΩ and a knee impedance limiting voltage of 1.7 V at 6 V. The device supports a maximum peak operating voltage of 50 V, a continuous forward current of 20 mA, and a junction temperature range of -55°C to 150°C.

Current Regulation - Diodes, Transistors Feature Summary

• Maintains constant current across a broad voltage span without requiring additional bias circuits.
• Provides high consistency and performance comparable to or exceeding legacy SST502 series components.

Current Regulation - Diodes, Transistors Applications

• Biasing circuits for sensors
• LED driving applications
• Test and measurement instruments
• Medical equipment power supplies

Current Regulation - Diodes, Transistors Procurement Notes

Verify the specific suffix code against official datasheets to confirm pinout configuration and tolerance grades. Ensure the supplier provides traceable documentation matching the Linear Integrated Systems part number. Confirm RoHS compliance status if required for your assembly process. Cross-reference the dynamic impedance specifications with your circuit requirements.

Current Regulation - Diodes, Transistors Selection Notes

Select the J503 variant when a nominal current of approximately 0.45 mA is required. Verify that the load voltage remains below the 50 V peak limit. Consider the 2 mΩ dynamic impedance for low-noise stability. Ensure the thermal environment stays within the specified -55°C to 150°C junction temperature range for reliable operation.

Current Regulation - Diodes, Transistors Part Context

This component belongs to the SST500 series of current-regulating diodes. It serves as a direct replacement for older SST502 series parts, offering improved performance metrics. The series covers a wide range of currents from 0.192 mA to 5.6 mA, allowing designers to choose precise current levels for various analog and digital circuit applications.

Current Regulation - Diodes, Transistors Replacement Considerations

The J503 is documented as a superior alternative to the Vishay/Siliconix SST502 series. Verify pin compatibility when substituting into existing designs. Check if the lower dynamic impedance of the J503 affects loop stability in sensitive feedback paths compared to the original design intent.