AA4040 SMD LEDs Kingbright AA4040 SMD LEDs are designed for all SMD assembly and solder processes. These LEDs are Halogen-free, RoHS compliant, and feature level 3 moisture sensitivity. The AA4040 SMD LEDs are available on tape and reel. These SMD LEDs are categorically available as IR LEDs, phototransistors, and standard LEDs. Typical applications include backlight, status indicator, home/smart appliances, wearable and portable devices, and healthcare.