2N4856 TIN/LEAD

Jfets Overview

The Central Semiconductor Corp 2N4856 is an N-channel silicon Junction Field-Effect Transistor (JFET) designed for small-signal applications. It operates in depletion mode and features a TO-18 metal can package with three terminals. The device supports a maximum drain-source voltage of 40 V and a gate-source voltage of -40 V. Absolute maximum ratings include a power dissipation of 0.36 W at 25°C case temperature and a junction temperature range extending up to 200°C. The component utilizes tin/lead termination plating.

Jfets Feature Summary

• Constructs a single N-channel JFET element within a hermetically sealed metal can housing.
• Operates in depletion mode, allowing current flow at zero gate-source bias.
• Features low feedback capacitance suitable for high-frequency signal processing.

Jfets Applications

• Low-noise amplifier stages
• High-impedance input buffers
• Analog switching circuits

Jfets Procurement Notes

Verify the specific manufacturer source, as the 2N4856 designation is shared across multiple vendors including Microsemi and Vishay. Confirm that the tin/lead finish matches project requirements for solderability and regulatory compliance. Ensure the TO-18 package dimensions align with existing board layouts before procurement.

Jfets Selection Notes

Select this component when a ruggedized, hermetically sealed N-channel JFET is required for harsh environments. Compare the 40 V breakdown voltage against circuit requirements. Consider the thermal resistance and power dissipation limits relative to the expected operating temperature range and heat sinking capabilities.

Jfets Part Context

This part belongs to a series of military-grade or high-reliability N-channel JFETs. It shares functional similarities with parts like the 2N4857 and 2N4858, which differ primarily in breakdown voltage specifications. The TO-18 package is standard for through-hole mounting in legacy and aerospace designs.

Jfets Replacement Considerations

Direct substitutes include the Microsemi 2N4856JAN or Vishay 2N4856JANTXV. Verify pinout compatibility and electrical parameter tolerances, particularly regarding pinch-off voltage and leakage currents, before substituting.