De scrip tion The OP954 device consists of a PIN silicon photodiode molded in a clear epoxy package which allows spectral response from visible to infrared light wavelengths. The very wide receiving angle provides relatively even reception over a large area. The side-looking package is designed for easy PC board mounting. These devices are 100% production tested using infrared light for close correlation with Optek’s GaAs and GaAlAs emitters.