Page 1
Low voltage fast-switching NPN power transistor
Features
■ Very low collector-emitter saturation voltage
■ High current gain characteristic
■ Fast switching speed
Applications
2STF1340
4
3
2
1
■ LED
■ Motherboard & hard disk drive
■ Mobile equipment
■ DC-DC converter
Description
The 2STF1340 is a NPN transistor 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.
The complementary PNP is the 2STF2340.
SOT-89
Figure 1. Internal schematic diagram
Table 1. Device summary
Order code Marking Package Packaging
2STF1340 1340 SOT-89 Tape and reel
October 2009 Doc ID 12796 Rev 2 1/10
www.st.com
10
Page 2
Electrical ratings 2STF1340
1 Electrical ratings
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
V
V
V
I
P
T
Collector-emitter voltage (VBE = 0) 40 V
CES
Collector-emitter voltage (IB = 0) 40 V
CEO
Emitter-base voltage (IC = 0) 5 V
EBO
I
Collector current 3 A
C
Collector peak current (tP < 5 ms) 6 A
CM
Total dissipation at T
tot
Storage temperature -65 to 150 °C
stg
T
Max. operating junction temperature 150 °C
J
= 25 °C 1.4 W
amb
Table 3. Thermal data
Symbol Parameter Value Unit
(1)
R
thJA
1. Device mounted on PCB area of 1 cm²
Thermal resistance junction-ambient __max 89 °C/W
2/10 Doc ID 12796 Rev 2
Page 3
2STF1340 Electrical characteristics
2 Electrical characteristics
T
= 25 °C unless otherwise specified.
case
Table 4. Electrical characteristics
Symbol Parameter Test conditions Min. Typ. Max. Unit
I
CBO
I
EBO
Collector cut-off current
= 0)
(I
E
Emitter cut-off current
= 0)
(I
C
V
= 40 V 0.1 µA
CB
V
= 5 V 0.1 µA
EB
Collector-base
V
(BR)CBO
breakdown voltage
= 0)
(I
E
= 100 µA 40 V
I
C
Collector-emitter
(1)
V
(BR)CEO
V
(BR)EBO
V
CE(sat)
V
BE(sat)
h
FE
f
T
C
CBO
t
on
t
off
1. Pulse test: pulse duration ≤ 300 µs, duty cycle ≤ 2 %
breakdown voltage
= 0)
(I
B
Emitter-base breakdown
voltage (IC = 0)
Collector-emitter
(1)
saturation voltage
Base-emitter saturation
(1)
voltage
(1)
DC current gain
Transition frequency
Collector-base
capacitance (I
Resistive load
Turn-on time
Turn-off time
E
= 0)
= 10 mA 40 V
I
C
I
= 100 µA 5 V
E
= 2 A IB = 100 mA
I
C
IC = 3 A IB = 150 mA
= 2 A IB = 100 mA 1.2 V
I
C
I
= 0.1 A V
C
= 1 A V
I
C
= 3 A V
I
C
IC = 0.1 A V
f = 100 MHz
f = 1 MHz V
IC = 1.5 A V
I
= - I
B(on)
V
BB(off)
B(off)
= - 5 V
= 2 V
CE
= 2 V
CE
= 2 V
CE
= 5 V
CE
= 10 V 30 pF
CB
= 10 V
CC
= 150 mA
100
180
220
100 MHz
65
750
250
350mVmV
450
ns
ns
Doc ID 12796 Rev 2 3/10
Page 4
Electrical characteristics 2STF1340
2.1 Electrical characteristics (curves)
Figure 2. Output characteristics Figure 3. Derating curve
3
IC (A)
2.5
2
IB = 10 mA
IB = 8 mA
IB = 6 mA
1.5
1
0.5
0
012345
Figure 4. DC current gain (VCE = 2 V) Figure 5. DC current gain (VCE = 5 V)
h
1000
FE
(VCE = 2 V)
TJ = - 40 °C
100
0.01 0.1 1 10
TJ = 25 °CTJ = 125 °C
IB = 4 mA
IB = 2 mA
VCE (V)
IC (A)
1000
h
FE
(VCE = 5 V)
TJ = 25 °CTJ = 125 °C
TJ = - 40 °C
100
0.01 0.1 1 10
IC (A)
Figure 6. Collector-emitter saturation
V
CE(sa t)
(V)
voltage
1
TJ = 125 °C
TJ = 25 °C
Figure 7. Base-emitter saturation
0.1
TJ = - 40 °C
0.01
(hFE = 20)
0.001
0.01 0.1 1 10
IC (A)
4/10 Doc ID 12796 Rev 2
voltage
V
1.2
BE(sat)
(V)
(hFE = 20)
1
TJ = - 40 °C
0.8
0.6
0.4
0.01 0.1 1 10
TJ = 125 °C
TJ = 25 °C
IC (A)
Page 5
2STF1340 Electrical characteristics
t
t
tst
Figure 8. Resistive load switching on Figure 9. Resistive load switching off
100
t (ns)
r
t (ns)
10000
1000
VCC = 10 V, V
= -I
I
B(on)
B(off)
= -5 V,
BB(off)
, hFE = 10
d
VCC = 10 V, V
I
) = -I
B(on
BB(off )
B(off)
= -5 V,
, hFE = 10
10
00.511.522.5 33.5
Figure 10. Capacitance curves
1000
C (pF)
100
10
0.1 1 10 100
f = 1 MH z
C
EB
IC (A)
C
CB
VR (V)
100
10
00.511.522.533.5
f
IC (A)
Doc ID 12796 Rev 2 5/10
Page 6
Electrical characteristics 2STF1340
2.2 Test circuits
Figure 11. Resistive load switching
1. Fast electronic switch
2. Non-inductive resistor
6/10 Doc ID 12796 Rev 2
Page 7
2STF1340 Package mechanical data
3 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK®
®
is an ST trademark.
Doc ID 12796 Rev 2 7/10
Page 8
Package mechanical data 2STF1340
SOT-89 mechanical data
Dim.
Min. Typ. Max.
A 1.40 1.60
B 0.44 0.56
B1 0.36 0.48
C0.35 0.44
C1 0.35 0.44
D 4.40 4.60
D1 1.62 1.83
E2.29 2.60
e 1.42 1.57
e1 2.92 3.07
H 3.94 4.25
K1° 8°
L0.89 1.20
R0.25
mm
7098166_C
8/10 Doc ID 12796 Rev 2
Page 9
2STF1340 Revision history
4 Revision history
Table 5. Document revision history
Date Revision Changes
20-Oct-2006 1 Initial release
Document status promoted from preliminary data to datasheet,
19-Oct-2009 2
inserted electrical characteristics (curves) section and updated
mechanical data
Doc ID 12796 Rev 2 9/10
Page 10
2STF1340
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10/10 Doc ID 12796 Rev 2
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