The SFH618A / SFH6186 is an optocoupler featuring a high current transfer ratio, low coupling capacitance and high isolation voltage. This optocoupler uses a GaAs infrared diode emitter, optically coupled to a silicon planar phototransistor detector, and is incorporated in a plastic DIP-4 or SMD package. The coupling device is designed for signal transmission between two electrically separated circuits.
The SFH618A (DIP) and SFH6186 (SMD) optocouplers provide high current transfer ratios, low coupling capacitance and robust isolation for telecom, industrial controls, battery‑powered equipment and office machines. They feature a GaAs infrared emitter optically coupled to a silicon planar phototransistor and are available in end‑stackable packages.
Key specifications include a collector‑emitter voltage of 55 V, isolation test voltage of 5300 V RMS, CTR ranges from 63 % to 500 % depending on variant, and compliance with RoHS and various safety standards. Package dimensions, switching times and thermal characteristics are also detailed.
| Collector‑emitter voltage (VCEO) | 55 V |
|---|---|
| Isolation test voltage | 5300 V RMS |
| Current Transfer Ratio (CTR) for SFH618A‑2 | 63 % – 125 % |
| Coupling capacitance | 0.25 pF |
| Power dissipation | 150 mW |
The device can withstand up to 55 V between collector and emitter.
It is rated for an isolation test voltage of 5300 V RMS.
The SFH618A‑2 variant provides a current transfer ratio between 63 % and 125 %.
Yes, they are lead‑free and meet RoHS 2002/95/EC requirements.