4N33TVM

Overview

The Fairchild Semiconductor 4N33TVM is a single-channel optocoupler featuring a gallium arsenide infrared emitter coupled to a silicon planar photodarlington output. It provides electrical isolation with a voltage rating of 7500Vpk or 4170Vrms depending on the specification source. The device supports through-hole mounting in a 6-DIP package (0.400 inch width). Key electrical parameters include a maximum collector current of 150 mA, a maximum collector-emitter voltage of 30 V, and an operating temperature range from -40°C to 100°C. The typical current transfer ratio is 500%.

Feature Summary

• Combines a gallium arsenide infrared LED with a silicon photodarlington for high gain output
• Provides robust electrical isolation between input and output circuits
• Designed for through-hole PCB mounting in standard DIP packages

Applications

• General-purpose signal isolation in industrial control systems
• Switching power supply feedback loops
• Microcontroller interface circuits requiring galvanic isolation

Procurement Notes

Verify the specific datasheet revision when ordering, as isolation voltage ratings may vary between 4170Vrms and 7500Vpk across different manufacturer specifications. Confirm the package width and pin configuration match the target footprint. Ensure the supplier sources genuine Fairchild or onsemi branded units to guarantee performance reliability.

Selection Notes

Select this component when a photodarlington output is required for higher sensitivity compared to standard phototransistor outputs. Consider the 150 mA collector current limit and 30 V breakdown voltage for load compatibility. Verify that the 6-DIP form factor fits the assembly constraints and that the operating temperature range meets environmental requirements.

Part Context

The 4N33 series is a widely used family of transistor-output optocouplers originally developed by Fairchild Semiconductor. The 4N33TVM specifically denotes the tape-and-reel variant of the standard 4N33 DIP-6 package. This component serves as a fundamental building block for isolating low-voltage digital signals from higher-voltage analog or power domains.

Replacement Considerations

Direct replacements include other 4N33 variants such as the 4N33M or generic equivalents like PC817 if pinout and CTR characteristics are compatible. Verify that substitute components meet the same isolation voltage and current transfer ratio requirements.