SFH 421 and SFH 426 are SMT-packaged GaAlAs infrared emitters with high efficiency, linearity, can be used for DC or pulsed applications, reliable, high pulse loading capability, suitable for surface mounting.
The SFH 421 and SFH 426 are GaAlAs infrared emitters in SMT packages with high efficiency, good linearity and high pulse handling capability. They are suitable for surface mounting, available on tape and reel, and are used in miniature photointerrupters, industrial electronics, automotive technology, sensor systems, alarm and safety equipment, and IR free‑air transmission.
The datasheet lists maximum ratings, electrical characteristics, optical performance, package dimensions and recommended soldering conditions. It also includes packaging and legal notices from OSRAM Opto Semiconductors. This manual is written in German.
| Peak emission wavelength | 880 nm |
|---|---|
| Forward current (continuous) | 100 mA |
| Reverse voltage | 5 V |
| Power dissipation | 180 mW |
| Half angle | +60° |
| Active chip area | 0.09 mm² |
| Typical radiant intensity | 48 mW/sr |
| Thermal resistance (junction‑ambient, mounted on FR4) | 450 K/W |
| Package dimensions (SFH 421) | 3.0 x 2.1 mm (typ.) |
The maximum continuous forward current is 100 mA.
The peak wavelength is 880 nm.
A copper pad area larger than 16 mm² is recommended for improved heat dissipation.