This device is a silicon Zener voltage regulator diode with a nominal Zener voltage of 6.2 V. Motorola OCR-indexed datasheet text places it in the 1N4728A to 1N4764A family of 1 to 1.3 watt glass Zener regulator diodes. The family is described as using a DO-41 hermetically sealed glass package for through-hole mounting. Family electrical data also lists a maximum forward voltage of 1.2 V at 200 mA.
