4N23ATX

Overview

The 4N23ATX is a high-reliability, military-grade transistor output optocoupler manufactured by TT Electronics/Optek Technology. It features an NPN phototransistor with a base connection for improved switching performance and stability. The device provides electrical isolation with a maximum isolation voltage of 1000 VRMS. Key electrical parameters include a collector-emitter saturation voltage of 300 mV maximum, a collector current of 50 mA maximum, and a collector-emitter voltage of 35 V maximum. The forward voltage is 1.3 V at a forward current of 10 mA. Switching characteristics include rise and fall times of 15 µs. It is housed in a TO-78-6 metal can package suitable for through-hole mounting.

Feature Summary

• Military-grade reliability with JANTX qualification
• Integrated base connection on the phototransistor for enhanced control
• High isolation voltage capability of 1000 VRMS
• Metal can packaging for robust environmental protection

Applications

• Military and aerospace electronic systems
• High-reliability industrial control circuits
• Medical equipment requiring strict isolation standards
• Harsh environment signal transmission interfaces

Procurement Notes

Verify that the specific part number includes the JANTX suffix to ensure compliance with military reliability standards. Confirm that the procurement source provides traceability documentation required for defense or aerospace applications. Check for RoHS compliance status if the application requires it, although military parts may have exemptions. Ensure the supplier handles hermetic metal can packages appropriately to prevent damage during shipping and storage.

Selection Notes

Select this component when high reliability and radiation hardness are critical requirements. The integrated base allows for faster switching and better noise immunity compared to standard variants without a base pin. Consider the TO-78 package size constraints for PCB layout. Evaluate the thermal dissipation capabilities of the metal case if operating near maximum current limits. Compare against non-military equivalents if cost is a primary driver and reliability requirements are less stringent.

Part Context

This component belongs to the 4N2x series of optocouplers from TT Electronics/Optek Technology. The 4N23 variant specifically includes a base connection on the output transistor. The JANTX designation indicates it meets specific military quality and screening standards. This series is widely used in applications where standard commercial components would fail due to environmental stress or reliability demands.

Replacement Considerations

The 4N23A is a commercial equivalent but lacks military qualification. The 4N23AT is another variant within the same family. Verify pin compatibility and electrical specifications before substituting. Ensure any replacement meets the required isolation voltage and switching speed for the specific circuit design.