2N2640

Overview

The Central Semiconductor Corp 2N2640 is an NPN low noise transistor housed in a TO-78 package. It features a maximum collector current of 30 mA and a collector-emitter voltage rating of 45 V. The device provides a minimum DC current gain (hFE) of 10 at a collector current of 50 mA and a collector-emitter voltage of 5.0 V. The saturation voltage is specified as a maximum of 0.01 V under these conditions, with a transition frequency of 10 MHz.

Feature Summary

• Designed for low noise amplification applications
• Utilizes a metal cylindrical TO-78 package

Applications

• Low noise amplifier circuits
• RF signal processing stages

Procurement Notes

This component has been officially classified as End of Life by the manufacturer. No replacement part numbers are currently available from Central Semiconductor Corp. Verification of final stock availability or alternative sourcing through authorized distributors is required before design implementation.

Selection Notes

Engineers should evaluate the specific low noise requirements against the 10 MHz transition frequency limit. The TO-78 metal package necessitates specific mounting considerations compared to modern plastic surface mount alternatives. Design reviews must account for the discontinued status when planning long-term production runs.

Part Context

The 2N2640 belongs to a family of NPN transistors manufactured in the TO-78 case style. This series includes various low noise and general-purpose switching devices. All transistors within this specific TO-78 package line have been transitioned to End of Life status by the manufacturer.

Replacement Considerations

No direct replacement part numbers are listed in the official discontinuation notice. Customers requiring technical assistance to locate alternate sources should contact the manufacturer's engineering department directly via email.