STSA851

STSA851 Low voltage fast-switching NPN power transistor Features ■ Very low collector to emitter saturation www.DataSheet4U.com ■ High current gain characteristic ■ voltage Fast-switching speed Applications ■ ■ ■ ■ Emergency lighting Voltage regulators Relay drivers High efficiency low voltage switching applications Figure 1. Internal schematic diagram TO-92 TO-92AP Description The device is manufactured in NPN planar technology by using a "base island" layout. the resulting transistor shows exceptional high gain performance coupled with very low saturation voltage. Table 1. Device summary Marking SA851 SA851 Package TO-92 TO-92AP Packaging Bulk Ammopack Order code STSA851 STSA851-AP March 2008 Rev 3 1/11 www.st.com 11 STSA851 Contents 1 2 Electrical ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 www.DataSheet4U.com Electrical characteristics (curves) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 3 4 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2/11 STSA851 Electrical ratings 1 Electrical ratings Table 2. S...