2N4391-2

Jfets Overview

The Vishay Siliconix 2N4391-2 is an N-channel Junction Field-Effect Transistor (JFET) belonging to the 2N/PN/SST4391 series. It features a hermetically sealed TO-206AA (TO-18) metal can package with MIL-S-19500 processing. The device operates in depletion mode with a gate-source breakdown voltage of -40 V and a maximum power dissipation of 1800 mW at 25°C. Key electrical parameters include a drain-source on-resistance of 30 Ω, a saturation drain current ranging from 50 mA to 150 mA, and a gate-source cutoff voltage between -4 V and -10 V.

Jfets Feature Summary

• Hermetically sealed metal can construction suitable for demanding environments
• Low on-resistance for efficient signal conduction
• Fast switching capability with minimal turn-on delay
• High off-isolation with negligible leakage currents

Jfets Applications

• Analog switches
• Choppers
• Sample-and-hold circuits
• Commutators

Jfets Procurement Notes

Verify component authenticity through authorized channels due to potential availability issues. Confirm that the specific suffix indicates standard military-grade processing. Ensure compatibility with existing thermal management designs given the 1800 mW dissipation rating. Validate package dimensions against legacy board layouts before finalizing procurement decisions.

Jfets Selection Notes

Select this component when high isolation and low noise are critical for analog signal paths. The TO-18 package provides robust mechanical stability for through-hole mounting. Consider the wide range of cutoff voltages available within the series to match specific biasing requirements. Evaluate thermal derating factors if operating above ambient temperatures exceeding 25°C.

Jfets Part Context

This part belongs to the 2N4391 series alongside PN4391 and SST4391 variants. While the 2N prefix denotes the hermetic TO-18 package, other series members offer surface-mount or plastic alternatives. The series shares core electrical characteristics but differs in packaging and thermal handling capabilities. This specific variant targets applications requiring superior environmental resistance compared to non-hermetic options.

Jfets Replacement Considerations

Direct substitutes include PN4391 for plastic packages or SST4391 for surface mount. Verify pinout compatibility as lead configurations may differ between package types. Ensure replacement parts meet the same MIL-S-19500 standards if hermetic sealing is required for the application environment.