BZT585BxxT Precision Zener Diodes Diodes Inc. BZT585BxxT series offers Zener voltage tolerances of approximately 2% in a SOD-523 package. Its small, low profile surface mount package maximizes space savings. The advanced lead frame design provides 350mW power dissipation and enhanced thermal performance. Qualified to AEC-Q101 standards for high reliability. Lead-free/RoH-compliant.