FAIRCHILD QSE256, QSE257, QSE258, QSE259 Silicon Optical Photosensor Data Manual
Summary
The QSE25x series are high-sensitivity OPTOLOGIC® silicon photosensors designed for robust light detection and signal conditioning. These bipolar ICs feature Schmitt trigger outputs, ensuring excellent noise immunity and compatible TTL/LSTTL interfacing crucial for automated control systems and circuits. This technical manual provides comprehensive datasheets detailing performance curves, absolute maximum ratings, electrical characteristics, and specific functionality for various output configurations (Buffer and Inverter). Ideal for electronics designers requiring reliable switching or detection from low-to-medium intensity light sources.
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 7 |
| File Size | 581.94 KB |
| Published | June 05, 2026 |
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Frequently Asked Questions
What is the recommended operating voltage range?
The supply voltage (Vcc) must be between 4.0 and 16 V.
Which model offers a Totem-Pole Inverter output?
QSE257 provides a Totem-Pole, inverter output and is marked with the color yellow.
What frequency range can cause false triggering?
Ripple from DC to 50 MHz at 2.00 V peak to peak will cause false triggering.
How are the QSE25x devices rated for operating temperature?
The devices have an absolute maximum operating temperature of -40 to +85 °C.