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:
| Parameter | Symbol | Rating | Unit |
|---|---|---|---|
| Forward current: | IF | 60 | mA |
| Peak forward current (t = 10 µs): | IFM | 1 | A |
| Reverse voltage: | VR | 6 | V |
| LED power dissipation (TA = 25 °C): | PD | 100 | mW |
| Collector–Emitter voltage: | VCEO | 80 | V |
| Collector–Base voltage: | VCBO | 80 | V |
| Emitter–Collector voltage: | VECO | 7 | V |
| Emitter–Base voltage: | VEBO | 7 | V |
| Output power dissipation (TA = 25 °C): | PC | 150 | mW |
| Total power dissipation: | PTOT | 200 | mW |
| Isolation voltage (AC, 1 min, 40–60% RH): | VISO | 5 000 | V rms |
| Operating temperature: | TOPR | –55 to +110 | °C |
| Storage temperature: | TSTG | –55 to +125 | °C |
| Soldering temperature (10 s max): | TSOL | 260 | °C |
Applications:
- Power supply regulators.
- Digital logic inputs.
- Microprocessor inputs.
Package Contents:
- 1x 4N25 80V Photovoltaic Output Optoisolator (Manufacturer : EVERLIGHT Electronics )
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