J505 TO-92 2L

Current Regulation - Diodes, Transistors Overview

The Linear Integrated Systems J505 is a current regulator diode designed to maintain a stable output current within a ±20% tolerance. It utilizes JFET technology to provide a simple two-leaded device operation, eliminating the need for separate voltage sources or complex biasing circuits. The component operates with a maximum limiting voltage of 50V and features excellent temperature stability across its operating range. Key electrical parameters include a nominal regulation current of 1mA, a maximum power dissipation of 350mW, and a junction temperature rating up to 150°C. It is housed in a TO-92 plastic package.

Current Regulation - Diodes, Transistors Feature Summary

• Maintains constant current over a wide voltage range without external bias components
• Utilizes JFET techniques for high circuit stability versus temperature variations
• Provides tight guaranteed performance with ±20% current tolerance
• Suitable for low-voltage battery circuits and high-voltage spike protection

Current Regulation - Diodes, Transistors Applications

• Constant-current supply circuits
• Current-limiting applications
• Timing circuits requiring stable current sources
• Test equipment and instrumentation biasing

Current Regulation - Diodes, Transistors Procurement Notes

Verify the specific manufacturer source when sourcing this component, as Linear Integrated Systems products have been subject to corporate acquisitions and discontinuations. Confirm that the received part matches the original Linear specifications rather than generic equivalents. Check for any suffixes indicating package variations or lead-free compliance. Ensure the supplier provides traceability documentation for critical test and measurement applications.

Current Regulation - Diodes, Transistors Selection Notes

Select the J505 when a fixed 1mA current source is required with minimal external components. Consider the 50V maximum voltage limit and 350mW power dissipation constraints during thermal design. Evaluate the ±20% tolerance against application requirements; tighter tolerances may require different regulation methods. Compare dynamic impedance characteristics if load regulation precision is critical for the specific sensor or LED driver implementation.

Current Regulation - Diodes, Transistors Part Context

The J505 belongs to the J500 series of current regulator diodes, which are widely used in analog signal conditioning and protection circuits. This series replaces earlier Siliconix SST500 variants, offering improved consistency and availability. The TO-92 package makes it suitable through-hole PCB designs common in industrial instrumentation. Understanding the series context helps in identifying compatible pinouts and mechanical dimensions for board layout replacements.

Current Regulation - Diodes, Transistors Replacement Considerations

Direct substitutes include the SST505 from Vishay/Siliconix, which shares similar electrical characteristics. Verify pinout compatibility, as some legacy packages may differ. Ensure replacement parts meet the same ±20% tolerance and 50V rating. Cross-reference datasheets for dynamic impedance and knee voltage differences to ensure circuit functionality remains unaffected.