4N37

Transistor, Photovoltaic Output Optoisolators Overview

The Vishay 4N37 is a single-channel transistor output optocoupler featuring an infrared emitting diode and an NPN silicon phototransistor. It provides electrical isolation with a maximum insulation voltage of 5000 Vrms. Key electrical parameters include a collector-emitter voltage of 30 V, a collector current of 100 mA, and a minimum current transfer ratio of 100%. The device operates within a temperature range of -55°C to +100°C and is housed in a DIP-6 package.

Transistor, Photovoltaic Output Optoisolators Feature Summary

• Provides high-voltage electrical isolation between input and output circuits
• Utilizes an infrared LED coupled with an NPN silicon phototransistor for signal transmission
• Offers low input-output coupling capacitance for noise rejection

Transistor, Photovoltaic Output Optoisolators Applications

• AC mains detection
• Switch mode power supply feedback
• Logic ground isolation

Transistor, Photovoltaic Output Optoisolators Procurement Notes

Verify the specific ordering suffix to confirm lead form configuration (STD, G, or SMD) as this affects physical mounting compatibility. Confirm RoHS compliance status through official documentation before integration. Ensure the selected variant matches the required isolation test voltage specifications for the target application safety standards.

Transistor, Photovoltaic Output Optoisolators Selection Notes

Select the 4N37 when a standard NPN phototransistor output is sufficient for the isolation requirement. Consider the 100% minimum current transfer ratio for reliable switching at moderate speeds. Evaluate the DIP-6 package constraints against available board space. Compare against the 4N35 or 4N36 if different current transfer ratios are needed.

Transistor, Photovoltaic Output Optoisolators Part Context

The 4N37 belongs to the Vishay industry-standard single-channel phototransistor coupler family, which includes the 4N35, 4N36, and 4N38. These devices utilize a double molding isolation manufacturing process to achieve high isolation performance. The series is recognized by Underwriters Laboratories (UL) and approved to VDE 0884 standards.

Transistor, Photovoltaic Output Optoisolators Replacement Considerations

The 4N35 and 4N36 are part-specific substitutes within the same Vishay family, offering similar functionality but potentially differing current transfer ratios.