View dz23c-series datasheet:

DZ23 Series Zener Diodes SOT-23 0.100 1.40 0.013 0.95 0.50 0.35 Features 3.10 2.70 0.19 Zener Voltage Range 2.7 V to 51 V 0.08 Dual Silicon Zener Diodes, Common Cathode 3 Small Package Size for High Density Applications 1 2 Standard Zener voltage tolerance is ± 5 %. Pb / RoHS Free 1.02 0.89 2.04 1.78 3 bottom view 12 Dimensions in millimeters Absolute Maximum Ratings ( Ta = 25 °C ) RATING SYMBOL VALUE UNIT Total Power Dissipation (Note 1) Ptot 300 mW RӨJA Thermal Resistance ( Junction to Ambient) (Note 1) 420 °C/W TJ Junction Temperature 150 °C TSTG Storage Temperature Range - 65 to + 150 °C Note : (1) Device on fiberglass substrate. Fig. 1 POWER TEMPERATURE DERATING CURVE 400 300 200 100 0 0 25 50 75 100 125 150