4N37FM

Transistor, Photovoltaic Output Optoisolators Overview

The onsemi 4N37FM is a single-channel transistor output optocoupler featuring an NPN phototransistor with a base terminal. It provides high-voltage isolation of 7500 Vrms between input and output circuits. The device operates within a temperature range of -55°C to +100°C and supports a maximum collector-emitter voltage of 30V. Key electrical parameters include a typical rise/fall time of 2µs, a maximum forward current of 60mA, and a power dissipation rating of 250mW. It is housed in a 6-pin surface-mount package.

Transistor, Photovoltaic Output Optoisolators Feature Summary

• Provides galvanic isolation for signal transmission between separate circuits
• Includes a dedicated base terminal on the phototransistor for improved switching speed control
• Designed for robust performance across extended industrial temperature ranges

Transistor, Photovoltaic Output Optoisolators Applications

• General-purpose digital signal isolation
• Solid-state relay driver circuits
• Microcontroller interface isolation

Transistor, Photovoltaic Output Optoisolators Procurement Notes

Verify the specific suffix and package variant against the original design specification, as pinout configurations may differ between DIP and SMD versions. Confirm RoHS compliance status and lead times directly with authorized distributors or the manufacturer, as availability for this component type can vary significantly based on production cycles and regional stock levels.

Transistor, Photovoltaic Output Optoisolators Selection Notes

Select this component when a phototransistor output with a base connection is required to optimize switching characteristics. Ensure the isolation voltage rating meets the system's safety requirements. Compare the current transfer ratio and propagation delay specifications against the target application's timing constraints to ensure adequate performance margins.

Transistor, Photovoltaic Output Optoisolators Part Context

This part belongs to the standard 4N37 family of optocouplers, widely used for basic isolation tasks. The FM suffix typically denotes a surface-mount package variant, distinguishing it from through-hole DIP equivalents like the 4N37M. It serves as a cost-effective solution for isolating low-speed digital signals in consumer and industrial electronics.

Transistor, Photovoltaic Output Optoisolators Replacement Considerations

Direct substitutes include other 4N37 series variants such as the 4N37SM or 4N37SR2M from onsemi, provided the package footprint matches. Cross-manufacturer equivalents should be verified for identical pinouts and electrical ratings.