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LY251 datasheet. Manufacturer: LETEX.

LY251Photocoupler. Input continuous LED current 50 mA, input peak LED current 1000 mA, input LED reverse voltage 6 V. Off-state output terminal voltage 600 V, output peak repetitive surge current 1 A, output peak load current 0.6 A. in 4-pin SOP package. Operational temperature range from -40°C to 100°C.Datasheet*)
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