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STN951 Low voltage fast-switching PNP power transistor Features Very low collector-emitter saturation voltage High current gain characteristic 4 Fast switching speed Surface mounting device in medium power 3 SOT-223 package 2 1 Applications SOT-223 Emergency lighting Voltage regulators Relay drivers High efficiency low voltage switching Figure 1. Internal schematic diagram applications Description The device is manufactured in PNP planar technology by using a "Base Island" layout. The resulting transistor shows exceptional high gain performances coupled with very low saturation voltage. Table 1. Device summary Order codes Marking Package Packaging STN951 N951 SOT-223 Tape and reel October 2008 Rev 3 1/8 www.st.com 8 STN951 Contents 1 Electrical ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2/8 STN951 Electrical ratings 1 Electrical ratings Table 2. Absolute maximum rating Symbol Parameter Value Unit VCBO Collector-base voltage (IE = 0) -60 V VCEO Collector-emitter voltage (IB = 0) -60 V VEBO Emitter-base voltage (IC = 0) -6 V IC Collector current -5 A ICM Collector peak current (tP < 5 ms) -10 A IB Base current -1 A IBM Base peak current (tP < 5 ms) -2 A Ptot Total dissipation at Tamb = 25