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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
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