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STN851
Low voltage fast-switching NPN power transistor
Features
Very low collector to emitter saturation voltage
High current gain characteristic
4
Fast-switching speed
3
2
Applications 1
Emergency lighting
SOT-223
Voltage regulators
Relay drivers
High efficiency low voltage switching
applications
Figure 1. Internal schematic diagram
Description
The device is manufactured in Planar Technology
with "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
STN851 N851 SOT-223 Tape and reel
March 2009 Rev 7 1/10
www.st.com 10
Electrical ratings STN851
1 Electrical ratings
Table 2. Absolute maximum ratings
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) 10 A
IB Base current 1 A
IBM Base peak current (tP < 5 ms) 2 A
Ptot Total dissipation at Tamb = 25