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2STF1550
2STN1550
Low voltage high performance NPN power transistors
Preliminary Data
Features
Very low collector-emitter saturation voltage
High current gain characteristic
Fast switching speed 4
4
Surface mounting devices in medium power 3
SOT-89 and SOT-223 packages 2 3
2
1 1
Applications SOT-89 SOT-223
Emergency lighting
LED
Motherboard and hard disk drive
Mobile equipment
Figure 1. Internal schematic diagram
Battery charger
Voltage regulation
Description
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
saturation voltage.
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
Value
Symbol Parameter 2STF1550 2STN1550 Unit
SOT-89 SOT-223
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