How to find the right Infrared Emitters AI guide

Written by an AI model from its trained knowledge.

What the AI looks for in Infrared Emitters

Peak wavelength: Use 940 nm for remote controls and receivers tuned to it, and 850 nm for camera and night-vision illumination where a faint red glow is acceptable. Receivers and camera sensors respond most strongly to specific bands, and the wrong wavelength sharply reduces range.
Receiver pairing: For remote-control links, modulate the emitter at the receiver module's carrier frequency (commonly 38 kHz) and match its wavelength. Demodulating IR receivers ignore light that is not modulated at their carrier.
Viewing angle and radiant intensity: Choose a narrow beam angle for distance and a wide angle for area coverage, and compare radiant intensity at the same drive current. Radiant intensity determines usable range and is the key specification that separates otherwise identical-looking LEDs.
Drive current and pulsing: Stay within the rated continuous forward current, and use the higher pulsed rating only at the duty cycle the datasheet specifies. Overdriving gives a short-term range boost but shortens the emitter's life.
Package: Match the footprint: 3 mm or 5 mm through-hole, side-looking, or SMD. The package determines both the beam geometry and whether the part fits your board or bezel.

Vishay: Wide range of IR emitters and matching IR receiver modules.
ams OSRAM: High-power IR LEDs for illumination and sensing.
Everlight: Common source of through-hole and SMD IR LEDs.
Lite-On: Makes general-purpose IR emitters and phototransistor pairs.
Kingbright: Supplies hobby-friendly through-hole IR LEDs with clear datasheets.

Near-IR is invisible to the eye. Point a phone camera at it, and note that some rear cameras filter IR, so the front camera usually works better.