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BUY SFH309-4/5 https://www.utsource.net/itm/p/11659627.html

Manufacturer: OSRAM Description: SFH309-4/5 is a phototransistor optocoupler from OSRAM. It is a 4-pin DIP package with a built-in phototransistor and a GaAlAs infrared LED. Features: High current transfer ratio High isolation voltage High speed response Low input current Low power consumption Low output saturation voltage Applications: Industrial control systems Power supply control Motor control Automotive applications Signal transmission and isolation (For reference only)