MQ2N4393

Overview

The MQ2N4393 is a silicon N-channel Junction Field-Effect Transistor (JFET) manufactured by Microchip Technology. It is housed in a TO-18-3 metal can package designed for through-hole mounting. The device features an N-Channel configuration with a single internal transistor structure. Key electrical characteristics include a drain-source breakdown voltage of 40 V and a gate-source breakdown voltage of -40 V. The continuous drain current is specified at -100 pA, while the on-resistance is rated at 80 Ohms. Power dissipation capability reaches 360 mW, supporting operation within a temperature range from -65 C to +175 C.

Feature Summary

• Utilizes silicon technology for robust semiconductor performance
• Encapsulated in a hermetic TO-18-3 metal can package
• Designed for high-temperature environments up to 175 C

Applications

• High-temperature analog signal processing circuits
• Precision low-current switching applications
• Harsh environment electronic systems requiring wide thermal stability

Procurement Notes

Verify the specific datasheet revision and exact pinout configuration before integration into PCB layouts. Confirm that the TO-18-3 package dimensions align with existing mechanical constraints. Ensure thermal management strategies account for the 360 mW power dissipation rating under maximum operating conditions. Cross-reference the -100 pA drain current specification against circuit requirements to validate suitability for intended low-current operations.

Selection Notes

Select this component when designing circuits that demand stable JFET behavior across extreme temperature variations ranging from -65 C to +175 C. The TO-18-3 package offers superior environmental sealing compared to plastic alternatives. Consider the 80 Ohm on-resistance and 40 V breakdown limits when sizing biasing networks. This part is suitable for specialized analog applications where standard plastic-packaged transistors may fail due to thermal stress or humidity exposure.

Part Context

This device belongs to the Microchip Technology JFET product line, specifically categorized under discrete transistors. It serves as a specialized semiconductor solution for niche analog design challenges. The TO-18-3 packaging indicates a legacy but reliable form factor often preferred in aerospace or industrial sectors. It complements other silicon-based field-effect devices within the manufacturer's portfolio focused on durability and precision.

Replacement Considerations

Direct substitutes must match the N-channel polarity, TO-18-3 package, and 40 V breakdown voltage ratings. Verify equivalent thermal resistance and power dissipation capabilities. Check for compatible gate-source voltage limits to ensure circuit safety. Consult official replacement guides for cross-referenced JFETs with identical pinouts and electrical specifications.