PS2581AL1-W-A from CEL is a OPTOISOLATOR 5KV TRANS 4DIP
P6SMB250A-E3/52 from Vishay General Semiconductor - Diodes Division is a TVS DIODE 214VWM 344VC DO214AA
PS2506-1 from CEL is a OPTOISOLATOR 5KV DARL 4DIP
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