SFH 47278AS A01
Overview
The SFH 47278AS A01 is a high-power 940nm infrared emitter from the OSLON Black series, specifically designed for automotive in-cabin sensing applications. This double-stack emitter provides a high radiant intensity of 250mW/sr at 1A and is optimized for high-current pulse operation up to 1.5A. It features a broad radiation pattern of 130 degrees to 155 degrees and is AEC-Q102 qualified for use in demanding vehicle environments.
Why Choose This Part
The component offers excellent thermal management with a low thermal resistance of 6.6 K/W and high corrosion robustness (Class 3B). Its double-stack technology delivers high optical output in a compact 3.75mm x 3.75mm package, making it ideal for space-constrained automotive interior locations. The 940nm wavelength is well-suited for reducing the 'red glow' visible to the human eye compared to 850nm alternatives.
Applications
Key Specifications
Getting Started
When designing for high-current pulses, ensure the PCB layout includes sufficient copper area for the thermal pad to maintain a junction temperature below 145 degrees Celsius. Engineers should use a dedicated constant-current LED driver capable of 1.5A peaks and consider a narrow-band pass filter on the receiver side matched to the 940nm centroid wavelength to improve signal-to-noise ratio.
