This product is an optical switch with a working distance of 0.5-4 mm, adjustable working range, extremely low power consumption, very small SMD package, and can be used for position detection.
The SFH 7740 is a reflective optical switch with an adjustable working distance of 0.5‑4 mm and extremely low power consumption. It features a Schmitt‑trigger open‑drain output and a very small SMD package, making it suitable for mobile devices and position detection of sliding covers.
The document provides maximum ratings, recommended operating conditions, characteristic curves, switching distance details, and soldering/packaging guidelines. It also includes a block diagram, start‑up sequence, and timing diagram for proper integration.
| Working distance | 0.5‑4 mm |
|---|---|
| Forward current (I_F) | 10 mA (typical) |
| Ambient light suppression voltage | < 3 V |
The sensor works at distances from 0.5 mm up to 4 mm.
The emitter is driven with a typical forward current of 10 mA.