Page 1
Features
2ST31A
Low voltage NPN power transistor
■ High switching speed
■ Good performances in terms of h
linearity
FE
Application
■ Linear and switching industrial applications
Description
The device is manufactured in planar technology
with “base island” layout. The resulting transistor
shows high gain performance coupled with low
saturation voltage.
TAB
3
2
1
TO-220
Figure 1. Internal schematic diagram
Table 1. Device summary
Order code Marking Package Packaging
2ST31A 2ST31A TO-220 Tube
December 2010 Doc ID 17868 Rev 2 1/8
www.st.com
8
Page 2
Absolute maximum ratings 2ST31A
1 Absolute maximum ratings
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
V
V
V
I
P
T
Collector-base voltage (IE = 0) 60 V
CBO
Collector-emitter voltage (IB = 0) 60 V
CEO
Emitter-base voltage (IC = 0) 5 V
EBO
I
Collector current 3 A
C
Collector peak current 5 A
CM
Base current 1 A
I
B
Total dissipation at T
TOT
Storage temperature -65 to 150 °C
STG
T
Max. operating junction temperature 150 °C
J
= 25°C 40 W
case
Table 3. Thermal data
Symbol Parameter Value Unit
R
thJC
Thermal resistance junction-case max. 3.1 °C/W
2/8 Doc ID 17868 Rev 2
Page 3
2ST31A 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
CEO
I
EBO
I
CES
V
CEO(sus)
V
CE(sat)
V
BE(sat)
h
FE
1. Pulse test: pulse duration ≤ 300 µs, duty cycle ≤ 2 %
Collector cut-off current
(IB = 0)
Emitter cut-off current (IC = 0) V
Collector cut-off current
= 0)
(V
BE
Collector-emitter
(1)
sustaining voltage (I
Collector-emitter saturation
(1)
voltage
Base-emitter saturation
(1)
voltage
(1)
DC current gain
= 0)
B
V
CE
EB
V
CE
I
= 30 mA 60 V
C
= 3 A_ IB = 375 mA 1.2 V
I
C
I
= 3 A__ IB = 375 mA 1.45 V
C
IC = 20 mA__ V
IC = 1 A _ _ V
= 30 V 0.3 mA
= 5 V 1 mA
= 60 V 0.2 mA
CE
CE
= 4 V
= 4V
10025150
Doc ID 17868 Rev 2 3/8
Page 4
Electrical characteristics 2ST31A
0.1
1
Ic(A)
Ic(A)
0.01 0.1 1
0.01
0.1
V
CE
(sat)
(V)V)
2.1 Electrical characteristics (curve)
Figure 2. Safe operating area Figure 3. Derating curves
Figure 4. DC-current gain Figure 5. Base-emitter saturation
FE
h
TJ= -40°C
TJ= 25°C
VBE(sat)
(V)
voltage
hFE= 10
100
TJ= 150°C
VCE = 4 V
10
0.01
0.1
1
I
C (A)
Figure 6. Collector-emitter saturation
CE
(sat)
voltage
hFE= 10
TJ= 150°C
TJ= 25°C
TJ= -40°C
I
0.1
1
0.01
TJ= -40°C
TJ= 25°C
TJ= 150°C
4/8 Doc ID 17868 Rev 2
Page 5
2ST31A 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 17868 Rev 2 5/8
Page 6
Package mechanical data 2ST31A
TO-220 type A mechanical data
Dim
Min Typ Max
mm
A 4.40 4.60
b 0.61 0.88
b1 1.14 1.70
c0.48 0.70
D 15.25 15.75
D1 1.27
E10 10.40
e 2.40 2.70
e1 4.95 5.15
F 1.23 1.32
H1 6.20 6.60
J1 2.40 2.72
L13 14
L1 3.50 3.93
L20 16.40
L30 28.90
∅P 3.75 3.85
Q 2.65 2.95
6/8 Doc ID 17868 Rev 2
0015988_Rev_S
Page 7
2ST31A Revision history
4 Revision history
Table 5. Document revision history
Date Revision Changes
24-Aug-2010 1 Initial release.
14-Dec-2010 2 Document status promoted from preliminary data to datasheet.
Doc ID 17868 Rev 2 7/8
Page 8
2ST31A
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