TLP280-4GB

The TLP280-4GB is a photocoupler (optoisolator) from Toshiba, designed for signal isolation in electronic circuits. It features a GaAs infrared LED paired with a phototransistor, providing 4 kV AC isolation (1 min) to protect sensitive components from high-voltage transients.
Key specifications:
- Current Transfer Ratio (CTR): 50–600% (min. 50% at 5 mA input).
- Isolation Voltage: 4 kV (AC, 1 min).
- Switching Speed: 3 μs (turn-on) / 2.3 μs (turn-off).
- Package: 4-pin DIP.
Applications include power supply feedback, industrial controls, and digital logic isolation. The "GB" suffix indicates lead-free compliance (RoHS).
For exact details, refer to Toshiba’s datasheet.

Equivalent products to the TLP280-4GB (a photocoupler/optocoupler by Toshiba) include:
- TLP281-4 (Toshiba) – Similar specs, lower current.
- PC817 (Sharp/ON Semi) – Common alternative, lower speed.
- H11AA1 (Vishay/Fairchild) – Comparable isolation voltage.
- LTV-817 (Lite-On) – Pin-compatible, widely available.
Check datasheets for exact compatibility in your application.

The TLP280-4GB is a photocoupler (optoisolator) with the following key features:
- High Isolation Voltage: 5,000 Vrms (min) for robust electrical isolation.
- Current Transfer Ratio (CTR): 50–600% (min–max) at 5 mA input current.
- Low Input Current: 5 mA (typical) for efficient operation.
- Fast Switching Speed: Turn-on time 3 μs (max), turn-off time 4 μs (max).
- Wide Operating Temperature: -55°C to +110°C for harsh environments.
- Compact Package: 4-pin DIP (Dual In-line Package).
- High Reliability: Suitable for industrial and automotive applications.
Ideal for signal isolation in power supplies, PLCs, and digital interfaces.