2N2647

Overview

The Central Semiconductor Corp 2N2647 is a silicon PN unijunction transistor housed in a TO-18 metal can package. It features an interbase voltage rating of 35 V and an emitter reverse voltage of 30 V. The device supports a peak emitter current of 2.0 A with a duty cycle not exceeding 1% and a pulse repetition rate of 10 pps. RMS power dissipation is rated at 300 mW, while the RMS emitter current limit is 50 mA. The intrinsic standoff ratio ranges from 0.68 to 0.82, and the interbase resistance spans 4.7 kΩ to 9.1 kΩ. Peak emitter current is specified at a maximum of 2.0 μA.

Feature Summary

• Designed for general purpose industrial applications requiring circuit economy
• Suitable for triggering high power SCRs due to low emitter leakage current
• Utilizes silicon PN structure for reliable switching performance

Applications

• Triggering circuits for Silicon Controlled Rectifiers (SCRs)
• General purpose industrial timing circuits
• Pulse generation applications

Procurement Notes

This component has been officially discontinued by Central Semiconductor Corp and is classified as End of Life. Availability is restricted to existing stock only, with no further production orders accepted. Buyers must verify current inventory status directly with the manufacturer or authorized distributors, as supply is finite and subject to depletion without replacement manufacturing.

Selection Notes

Engineers should evaluate this device specifically for legacy designs requiring its unique electrical characteristics, such as the defined intrinsic standoff ratio range. Due to the discontinuation status, alternative sourcing strategies must be implemented. Verification of the specific lot date code and physical condition of available stock is essential before integration into new or maintenance projects.

Part Context

The 2N2647 belongs to the family of silicon PN unijunction transistors manufactured by Central Semiconductor Corp. It shares the TO-18 case style with similar devices like the 2N2646 but offers distinct electrical parameters optimized for low trigger current requirements. This component type serves as a foundational discrete semiconductor element for analog control and pulse timing functions.

Replacement Considerations

No direct replacement part number is listed by Central Semiconductor Corp for the 2N2647. The datasheet indicates that other discontinued parts in the series also lack official substitutes. Users are advised to contact [email protected] for assistance in locating alternate sources or equivalent components from other manufacturers.

FAQ

What is the maximum peak emitter current allowed for the 2N2647?

The maximum peak emitter current is 2.0 A, provided the duty cycle does not exceed 1% and the pulse repetition rate is 10 pps or less.

Is the 2N2647 currently in production?

No, the 2N2647 has been discontinued and is classified as End of Life. It is available only from remaining stock.

What is the typical application for the 2N2647 compared to the 2N2646?

The 2N2647 is intended for applications requiring low emitter leakage current and low peak point emitter current, making it ideal for triggering high power SCRs.