The NTE5267AK is a 50W Zener stud diode in a DO5 package, with a 28V voltage rating, a 10uA current rating and a bulk package type, manufactured by NTE. The Zener stud diode is an electronic part used for regulating voltages and preventing voltage spikes. This diode functions like an ideal diode, allowing current to pass in one direction only. The DO5 package is an axial package, with pins along the sides, which helps external connections and increases the ruggedness of the part. The bulk package is used for parts which are shipped in bulk, rather than in individual parts.