OP290A - 

Optek OP290, OP291 and OP292 Series IREDs
The OP290, OP291 and OP292 series, from Optek Technology, are Infrared LEDs in an IR-transmissive package. They come in T-1 3/4 (5mm), TO-18 or TO-46 package options. They also have a choice of beam patterns and power ranges.