View 2n4990 datasheet:

2N4990 Silicon unilateral switch (SUS) in package TO-92 0.45max 0.7max 1 5.2 2.5 2 14.5 1.6 5.2 3 4.2 Pinouts: 1- Cathode, 2- Gate, 3- Anode Ratings Symbol Parameter, units Limits Vrrm Peak reverse voltage, V -30 IT(rms) DC forward anode current, mA 175 Igm DC gate current, mA 5 IT(sm) Peak recurrent forward current, A, (1% duty cycle, 10sec pulse width) 1 P Power dissipation, mW 300 Electrical Characteristics (TA=25C) Symbol Parameter, unit, test conditions Limits min max VS Switching voltage, V 7 9 IS 200 Switching current, A IH Holding current, mA 0.75 IR Revers current, A, VR=-30V 0.1 IB Forward current (off-state), A, VF=5V 0.1 VF On-State voltage, V, IF=175mA 1.5 Planeta JSC Planeta, 2/13, Fedorovsky Ruchei, Veliky Novgorod, 173004, Russia E l e c t r o n i c c o m p a n y Ph/Fax: +7 (81622)

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