Part Number : MMSZ5221B
Marking Code : C1
Function : 500mW, ZENER DIODE
Package : SOD-123 type
Maker : Diodes Incorporated.
Image : 
Description :
1. 500mW Power Dissipation
2. General Purpose, Medium Current,
3. Ideally Suited for Automated Assembly Processes
4. Totally Lead-Free & Fully RoHS Compliant
Mechanical Data
• Case: SOD123
• Case Material: Molded Plastic, “Green” Molding Compound.
• Moisture Sensitivity: Level 1 per J-STD-020
Datasheet PDF Download : 
Others datasheet of same file :
MMSZ5221, MMSZ5223B, MMSZ5225B, MMSZ5226B, MMSZ5227B