J111

Overview

The onsemi J111 is a single N-channel depletion-mode Junction Field-Effect Transistor (JFET) designed for precision analog applications. It utilizes silicon technology and is housed in a TO-92 through-hole package with three pins. Key electrical specifications include a maximum drain-source current of 20 mA, a maximum drain-source resistance of 30 Ω, and a power dissipation rating of 350 mW. The device operates within a temperature range of -55°C to 150°C junction temperature. Its construction supports low feedback capacitance, making it suitable for high-frequency signal processing tasks requiring minimal charge injection.

Feature Summary

• N-channel depletion mode operation for direct signal path integration
• Low feedback capacitance characteristics to minimize signal distortion
• Robust thermal performance across extended industrial temperature ranges

Applications

• Chopper-stabilized amplifier circuits
• Precision sample-and-hold switches
• High-impedance input buffers

Procurement Notes

Verify the specific manufacturer lot code and date code upon receipt to ensure component authenticity. Confirm that the physical marking on the TO-92 package matches the onsemi branding. Check for RoHS compliance documentation if environmental regulations apply to your assembly process. Ensure storage conditions remain within specified humidity limits to prevent lead frame oxidation before soldering.

Selection Notes

Select this component when designing circuits requiring low charge injection and high input impedance. Compare Idss variations against circuit tolerance requirements, as JFET parameters can exhibit significant batch-to-batch spread. Consider the TO-92 package constraints for thermal management in dense PCB layouts. Evaluate alternative packages like SOT-23 if surface-mount technology is mandatory for the production line.

Part Context

The J111 belongs to a family of N-channel JFET chopper transistors produced by onsemi. It serves as a discrete semiconductor solution for analog switching and amplification. The device complements other series members such as the J112 and J113, which offer similar functionalities but may differ in specific parameter tolerances or packaging options. It remains a standard choice for legacy and modern precision analog designs.

Replacement Considerations

Direct pin-compatible substitutes include the MMBFJ111 for surface-mount applications, though the package differs from the TO-92 form factor. Other manufacturers produce equivalent N-channel JFETs, but designers must verify matching Idss, Vgs(off), and Rds(on) specifications to ensure circuit compatibility without modification.