Description
4N26 Optocoupler DIP-6 – Phototransistor Opto-Isolator IC with Base Pin
The 4N26 optocoupler is a reliable opto-isolator IC designed to provide safe electrical isolation between control and power circuits. It uses an infrared LED optically coupled to a phototransistor and includes a base pin for improved switching control and sensitivity. Housed in a standard DIP-6 through-hole package, the 4N26 is widely used in SMPS feedback circuits, industrial control boards, relays, and microcontroller signal isolation.
| Specification | Details |
|---|---|
| Part Number | 4N26 |
| Device Type | Optocoupler / Opto-Isolator |
| Output Type | Phototransistor with Base Pin |
| Isolation Voltage | Up to 5000Vrms (Typical) |
| CTR (Current Transfer Ratio) | 20% – 50% (Typical) |
| Collector-Emitter Voltage | 30V |
| Input LED Forward Current | 10–20mA Typical |
| Package Type | DIP-6 Through-Hole |
Applications
- SMPS feedback and regulation circuits
- Microcontroller and logic signal isolation
- Relay drive and load switching isolation
- Industrial automation and PLC inputs
- Noise and ground-loop isolation
How to Use
- Connect a current-limiting resistor in series with the input LED.
- Drive the LED from the control or logic side.
- Use the phototransistor output with a pull-up resistor.
- Optional base pin connection improves switching performance.
- Maintain proper PCB isolation spacing for safety.
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