J502 TO-92 2L

Current Regulation - Diodes, Transistors Overview

The Linear Integrated Systems J502 is a two-lead current regulator diode housed in a TO-92 package. It provides a nominal regulation current of 0.43 mA with a guaranteed tolerance range of ±20%. The device operates at a maximum limiting voltage of 1.5 V and supports a peak operating voltage up to 50 V. It functions within a junction temperature range of -55 °C to +150 °C, dissipating a maximum power of 0.36 W.

Current Regulation - Diodes, Transistors Feature Summary

• Maintains constant current output across varying load conditions without requiring external biasing circuits.
• Utilizes JFET technology for high stability and simple series circuit integration.
• Offers excellent temperature stability suitable for demanding instrumentation environments.

Current Regulation - Diodes, Transistors Applications

• Constant-current supply circuits
• Current-limiting protection stages
• Timing circuits requiring stable reference currents

Current Regulation - Diodes, Transistors Procurement Notes

Verify the specific manufacturer source, as Linear Integrated Systems assets were acquired by Analog Devices. Confirm the package variant matches the required TO-92 configuration. Ensure the supplier documentation explicitly references the 0.43 mA regulation current and 1.5 V limiting voltage specifications to avoid substitution errors with similar J500 series components.

Current Regulation - Diodes, Transistors Selection Notes

Select this component when a precise low-current reference is needed for battery-operated or low-voltage applications. The ±20% tolerance defines the acceptable current variance. Verify that the circuit's minimum forward voltage exceeds the knee voltage to ensure proper regulation. Consider thermal dissipation limits if operating near the maximum junction temperature.

Current Regulation - Diodes, Transistors Part Context

The J502 belongs to the J500 series of current regulator diodes designed by Linear Integrated Systems. This series replaces older Siliconix designs and utilizes JFET techniques to create simple, reliable two-terminal devices. The family offers various current ratings, with the J502 specifically targeting the 0.43 mA application niche within test equipment and instrumentation markets.

Current Regulation - Diodes, Transistors Replacement Considerations

Publicly confirmed direct substitutes include the SST502 from Vishay/Siliconix, which serves as a functional equivalent in many designs. Other generic current regulator diodes may require circuit re-evaluation due to differences in dynamic impedance and voltage coefficients.

Current Regulation - Diodes, Transistors FAQ

What is the guaranteed tolerance for the J502 regulation current?

The J502 has a guaranteed tolerance of ±20% around its nominal 0.43 mA regulation current.

Can the J502 operate in high-voltage spike protection scenarios?

Yes, the device is rated for operation up to 50 V peak working voltage, making it suitable for high-voltage spike protection applications.

How does the J502 differ from standard Zener diodes?

Unlike Zener diodes which regulate voltage, the J502 regulates current. It maintains a nearly constant current flow regardless of voltage changes across its terminals, provided the voltage remains within its operational limits.