4N47

Transistor, Photovoltaic Output Optoisolators Overview

The 4N47 is a single-channel transistor output optocoupler manufactured by TT Electronics/Optek Technology. It features an NPN phototransistor output housed in a TO-78-6 metal can package. Key electrical parameters include a maximum collector-emitter voltage of 40 V, a maximum collector current of 50 mA, and an isolation voltage of 1000 VDC. The device operates with a forward current of 1 mA, a typical forward voltage of 1.5 V, and a reverse voltage of 2 V. Power dissipation is rated at 300 mW, with a current transfer ratio of 50%. Switching characteristics specify rise and fall times of 20 µs each. The unit supports a wide operating temperature range from -55°C to +125°C.

Transistor, Photovoltaic Output Optoisolators Feature Summary

• Provides galvanic isolation between input and output circuits via optical transmission.
• Features an NPN phototransistor output for digital signal switching applications.
• Utilizes a robust TO-78-6 metal can package for high reliability and thermal stability.

Transistor, Photovoltaic Output Optoisolators Applications

• Industrial control systems requiring circuit isolation
• Solid-state relay driver circuits
• Microprocessor interface logic isolation

Transistor, Photovoltaic Output Optoisolators Procurement Notes

Verify the specific manufacturer part number against official datasheets to confirm pinout compatibility and package type before integration. Ensure that the selected component meets the required insulation voltage ratings for the target application environment. Cross-reference specifications such as current transfer ratio and switching times with system design constraints to guarantee performance consistency across production batches.

Transistor, Photovoltaic Output Optoisolators Selection Notes

Select this component when a through-hole metal can package is required for high-reliability isolation. Consider the 40 V collector-emitter voltage limit and 50 mA maximum collector current against load requirements. Evaluate the 20 µs switching speed suitability for the intended signal frequency. Confirm that the 1000 VDC isolation rating aligns with safety standards applicable to the equipment design.

Transistor, Photovoltaic Output Optoisolators Part Context

The 4N47 belongs to the family of transistor output optocouplers produced by TT Electronics/Optek Technology. This series is designed for general-purpose isolation tasks where high reliability and standard digital switching speeds are sufficient. The TO-78-6 package represents a traditional form factor often used in legacy or high-voltage industrial designs requiring robust physical construction.

Transistor, Photovoltaic Output Optoisolators Replacement Considerations

Public confirmed substitute part numbers: 4N47U, JANTX4N47U