It's a ss14 Schottky Diode. It is a SMD type diode which have maximum repetitive reverse voltage 40v and maximum forward current 1A. It has maximum forward surge current are 40A. 
SPECIFICATION 
- Mounting Style: SMD/SMT    
 
- Package/Case: DO-214AC     
 
- Max Forward Current: 1A     
 
- Max Repetitive Reverse Voltage: 40V     
 
- Max Forward Voltage: 0.5V     
 
- Max Forward Surge Current: 40A
 
- Operating Temperature: -65 C to 150 C