4N25 80V Photovoltaic Output Optoisolator (Manufacturer : EVERLIGHT Electronics )

4N25 80V Photovoltaic Output Optoisolator (Manufacturer : EVERLIGHT Electronics )

The 4N25 is a single-channel optoisolator that employs an infrared LED paired with a silicon phototransistor to transfer electrical signals while providing galvanic isolation. In this device, the LED emits photons when driven by an input current; these photons traverse an internal gap and strike the base emitter region of the phototransistor, producing a proportional collector current. This optical coupling ensures that high-voltage or noisy input circuits remain electrically separated from sensitive output circuitry, enhancing system reliability and safety.

Packaged in a compact 6-pin dual-in-line (DIP) format, the 4N25 features wide lead spacing for improved creepage distance and is also offered in surface-mount variants for high-density layouts. Internally, pins 1–2 connect to the infrared LED anode and cathode, while pins 4–5 serve as the emitter and collector of the output phototransistor (pin 6 is the base, typically left open). When an input current of up to 60 mA flows through the LED, the phototransistor switches on, allowing currents up to the device’s maximum collector-emitter rating of 80 V to pass.

Designed for harsh environments, the 4N25 withstands repetitive isolation tests at 5 kV rms and operates across –55 °C to +110 °C. Its robust construction meets UL, VDE, CSA, and multiple international approvals, making it ideal for industrial power-supply regulators, digital logic interfaces, and microprocessor signal isolation.

Features:

• Available in standard and surface-mount 6-pin DIP packages (4N25, 4N26, 4N27, 4N28 series).
• High isolation voltage: 5 000 V rms.
• Creepage distance > 7.62 mm.
• Operating temperature range: –55 °C to +110 °C.
• Compact dual-in-line package; surface-mount options available.
• Pb-free and RoHS compliant.

Specifications:

Applications:

• Power supply regulators.
• Digital logic inputs.
• Microprocessor inputs.

Package Contents:

• 1x 4N25 80V Photovoltaic Output Optoisolator (Manufacturer : EVERLIGHT Electronics )

Data sheet