The 1N821UR thru 1N829AUR-1 series of surface mount Zero-TC Reference Diodes provides a selection of both 6.2 V and 6.55 V nominal voltages and temperature coefficients to as low as 0.0005%/oC for minimal voltage change with temperature when operated at 7.5 mA. These glass surface mount DO-213AA (MELF) reference diodes are optionally available with an internal-metallurgical-bond by adding a "-1" suffix as well as RoHS Compliant with an e3 suffix. This type of bonded Zener package construction is also available in JAN, JANTX, and JANTXV military qualifications (RoHS Compliant option not applicable). Microsemi also offers numerous other Zener Reference Diode products for a variety of other voltages up to 200 V.