This is one Lot (Qty. 100) of New On Semiconductor 400W Peak Power 12V TVS Diode, Part Number: 1SMA12AT3 in SMA Package. Device Marking: RE.
General Spec:
Detail Spec see Data Sheet at:
http://media.digikey.com/pdf/Data%20Sheets/ON%20Semiconductor%20PDFs/1SMA5.0AT3%20Series.pdf