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STSA851 Low voltage fast-switching NPN power transistor Features Very low collector to emitter saturation voltage High current gain characteristic Fast-switching speed Applications Emergency lighting Voltage regulators Relay drivers TO-92 TO-92AP High efficiency low voltage switching applications Description Figure 1. Internal schematic diagram 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 Order code Marking Package Packaging STSA851 SA851 TO-92 Bulk STSA851-AP SA851 TO-92AP Ammopack March 2008 Rev 3 1/11 www.st.com 11 STSA851 Contents 1 Electrical ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 Electrical characteristics (curves) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2/11 STSA851 Electrical ratings 1 Electrical ratings Table 2. Absolute maximum rating Symbol Parameter Value Unit VCBO Collector-base voltage (IE = 0) 150 V VCEO Collector-emitter voltage (IB = 0) 60 V VEBO Emitter-base voltage (IC = 0) 7 V IC Collector current 5 A ICM Collector peak current (tP < 5 ms) 20 A IB Base current 1 A Ptot Total dissipation at Tamb = 25