View src1211s datasheet:

SRC1211SNPN Silicon TransistorPIN Connection Descriptions OUT Switching application Interface circuit and driver circuit application OUT Features IN R1 With built-in bias resistor Simplify circuit design IN Reduce a quantity of parts and COMMONR1 = 10K manufacturing process High packing density COMMON Ordering Information Type NO. Marking Package Code RCD SRC1211S SOT-23 Device Code Year&Week Code Absolute Maximum Ratings (Ta=25C) Characteristic Symbol Rating UnitOutput voltage VO 50 VInput voltage VI 30, -5 VOutput current IO 100 mAPower dissipation PD 200 mWJunction temperature TJ 150 C Storage temperature range Tstg -55 ~ 150 C Electrical Characteristics (Ta=25C) Characteristic Symbol Test Condition Min. Typ. Max. UnitOutput cut-off current IO(OFF) VO=50V

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