4N24U

Overview

The 4N24U is a high-gain optocoupler featuring an N-P-N silicon phototransistor with base output, optically coupled to a GaAlAs infrared LED. It provides 1000VDC isolation voltage and operates within a temperature range of -65°C to 125°C. The device utilizes a 6-pin LCC clamshell package for through-hole mounting. Key electrical parameters include a maximum collector-emitter voltage of 35V, a DC forward current limit of 40mA, and a typical rise/fall time of 20µs/20µs. It offers a minimum current transfer ratio of 100% at 10mA input.

Feature Summary

• High gain optical coupling utilizing GaAlAs infrared LED technology
• Integrated base terminal on the N-P-N silicon phototransistor for enhanced control flexibility
• Robust 1000VDC isolation capability between input and output circuits

Applications

• Industrial control systems requiring signal isolation
• Medical equipment safety circuits
• Aerospace instrumentation interfaces

Procurement Notes

Verify component authenticity against manufacturer specifications before integration. Confirm package integrity and pin alignment for the 6-pin LCC clamshell format. Ensure environmental compliance with RoHS3 standards. Validate thermal performance within the specified operating range during system design.

Selection Notes

Select this component when base access is required for phototransistor biasing or speed optimization. Consider the TO-78 equivalent if hermetic sealing is mandatory, as the 4N24U uses a plastic clamshell package. Evaluate the 20µs switching speed against application timing requirements.

Part Context

This part belongs to the 4N22-24 series from TT Electronics/Optek Technology. It shares functional similarities with the 4N24 but differs in packaging. The 4N24U specifically utilizes a leadless chip carrier form factor, distinguishing it from the metal can variants in the same family.

Replacement Considerations

The 4N24 is listed as a parameter-equivalent substitute. Verify package compatibility as the 4N24 typically uses a TO-78 metal can while the 4N24U uses an LCC clamshell.

FAQ

What is the specific output configuration of the 4N24U?

The output is an N-P-N silicon phototransistor with an accessible base terminal.

Does the 4N24U support high-temperature operation?

Yes, it is rated for operation up to 125°C.