The DiodesZetex makes a 0.5W surface mount Zener diode. It has a planar die construction with ultra-small surface mount package. It is totally Lead, halogen and Antimony Free. The PD3Z284C5V1Q is suitable for automotive applications requiring specific change control. Forward voltage rating is from 0.9 V to 1.1 V Operating temperature range is from -65°C to +150°C moisture sensitivity of level 1 per J-STD-020 Terminals are Matte Tin annealed over Copper, in a powerDI323 (type B) package