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BUY PS2501 https://www.utsource.net/itm/p/1431939.html
HIGH ISOLATION VOLTAGE,SINGLE TRANSISTOR TYPE,MULTI PHOTOCOUPLER SERIES，
Description: The PS2501 is a 4-pin optically coupled isolator containing a GaAs light-emitting diode (LED) and an NPN silicon phototransistor. Features: - Isolation voltage: 5000 Vrms - CTR: 50 to 600% - Low input current: 0.5 mA - High collector-emitter voltage: 80 V - Low saturation voltage: 0.2 V - High isolation resistance: 10^9 Ω Applications: - Power supply - Industrial equipment - Office automation - Telecommunications - Security systems - Automotive (For reference only)