Fairchild Semiconductor QEC121 - PLASTIC INFRARED LIGHT EMITTING DIODE PLASTIC INFRARED LIGHT EMITTING DIODE QEC121 PACKAGE DIMENSIONS 0.116 (2.95) REFERENCE SURFACE 0.052 (1.32) 0.032 (0.082) 0.193 (4.90) QEC122 QEC123 (8 views)