This part is a kind of semiconductor called SM6.8A.

Function of this product has SURFACE MOUNT TRANSIENT VOLTAGE SUPPRESSOR.

Manufacturers : MIC

Image and pinout :

Some of the text within the PDF file :

SURFACE MOUNT TRANSIENT VOLTAGE SUPPRESSOR SM6.8 THRU SM200CA Breakdown Voltage Peak Pulse Power 6.8 to 200 Volts 400 Watts FEATURES • Plastic package has Underwriters Laboratory Flammability Classification 94V-O • For surface mounted applications • Glass passivated junction • Low inductance surge resistance • Fast response time: typical less than 1.0ps from 0 volts to V(BR) for unidirectional AND 5.0ns for bidirectional types • 400W peak pulse capability with a 10/1000μs waveform, repetition rate (duty cycle): 0.01% • For devices with V(BR) ≥10V, ID are typically less than 1.0μA • High temperature soldering guaranteed: 250℃/10 seconds at terminals DO-213AB Dimensions in inches and (millimeters) MECHANICAL DATA • Cass: JEDEC DO-213AB,molded plastic body over p [ ... ]

SM6.8A PDF Datasheet Download