The Operating Temperature Range of each is -40°C to +85°C, compared to the Avago part’s range of -40°C to +105°C The IC Series design requirement is that all parts inside the case must be rated for operation over that wider range (in particular, up to 105°C … since the interior of the charger can get near that, when operating at full power) The Avago part *does* satisfy that The parts Flex is suggesting *do not*part is as “bright” as the Avago part … about 1/3 for the Everlight (refer to the Luminous Intensity specification in the data sheets) The Everlight part’s Soldering Profile is sufficiently different (specifically, a higher peak temperature) than the Avago part’s that Flex might not be able to solder it successfully using Flex’s existing SMT oven profile(s)