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Low voltage high performance NPN power transistors
Very low collector-emitter saturation voltage
High current gain characteristic
Fast switching speed 4
Surface mounting devices in medium power 3
SOT-89 and SOT-223 packages 2 3
Applications SOT-89 SOT-223
Motherboard and hard disk drive
Figure 1. Internal schematic diagram
The 2STF1550 and 2STN1550 are NPN
transistors manufactured using new "PB-HCD"
(Power bipolar high current density) technology.
The resulting transistor shows exceptional high
gain performances coupled with very low
Table 1. Device summary
Order codes Marking Package Packaging
2STF1550 1550 SOT-89
Tape and reel
2STN1550 N1550 SOT-223
November 2008 Rev 2 1/8
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to www.st.com 8
change without notice.
Electrical ratings 2STF1550 - 2STN1550
1 Electrical ratings
Table 2. Absolute maximum rating
Symbol Parameter 2STF1550 2STN1550 Unit
VCES Collector-emitter voltage (VCE = 0) 50 V
VCEO Collector-emitter voltage (IB = 0) 50 V
VEBO Emitter-base voltage (IC = 0) 5 V
IC Collector current 5 A
ICM Collector peak current (tP < 5 ms) 10 A
IB Base current 1 A
PTOT Total dissipation at Tamb = 25
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