4N24

Overview

The 4N24 is a single-channel transistor output optocoupler manufactured by TT Electronics/Optek Technology. It features an NPN phototransistor output and operates with a maximum collector-emitter voltage of 35 V and a peak forward current of 40 mA. The device provides 1000 Vrms isolation voltage between input and output circuits. Key electrical parameters include a minimum current transfer ratio of 25% at 10 mA forward current, a typical forward voltage of 1.3 V, and a maximum collector-emitter saturation voltage of 300 mV. Switching characteristics specify rise and fall times of 15 µs each. The component is housed in a TO-78-6 metal can package designed for through-hole mounting.

Feature Summary

• Hermetically sealed TO-78 metal can package ensures durability in harsh environments
• Provides high-voltage electrical isolation between input and output circuits
• Includes base contact on the phototransistor for conventional biasing applications

Applications

• High-voltage isolation interfaces
• Industrial equipment control systems
• Medical equipment signal isolation
• Office equipment circuit protection

Procurement Notes

Verify that the specific order matches the exact manufacturer part number to ensure correct package type and pinout configuration. Confirm RoHS compliance status as specifications may vary by production batch or regional variant. Check datasheet revisions for any updates to absolute maximum ratings before final integration into hardware designs.

Selection Notes

Select this component when hermetic sealing and high reliability are required for optical isolation. The TO-78 package suits applications needing robust physical protection against environmental factors. Ensure the 25% minimum current transfer ratio meets the logic level requirements of the receiving circuit without excessive drive current.

Part Context

This device belongs to the 4N22-24 series of transistor output optocouplers from TT Electronics/Optek Technology. The series includes variants such as the 4N22 and 4N24A, sharing similar functional architectures but differing in specific electrical thresholds and processing standards. These components are widely recognized for their use in military and industrial isolation applications requiring proven performance.

Replacement Considerations

Public confirmed substitutes include the 4N24ATXV and 4N24A. Verify that replacement parts maintain identical pin configurations and meet the same isolation voltage requirements before substitution.