GP1L53VJ000F_DS.pdf Gap : 5mm, Slit : 0.5mm Darlington Phototransistor Output, Case package Transmissive Photointerrupter
PCN-01302009-1.pdf Photointerrupters in the series GP1A, GP1L, GP1S, GP2S, GP3A, and GP3S: Packing Change. Beginning in March 2009, the photointerrupters in the above series will be sealed in their packing bags with tape. There is no effect upon optical, reliability, quality, mechanical, electrical, or RoHS specifications.
PCN-20070504-01.pdf Photointerrupters:Internal Chip Change. The infrared emitter chips used in the listed Sharp devices will be changed to allow for a more stable source of supply. This change will take place as a running change to production beginning in June, 2007.