February 2011 Doc ID 4510 Rev 5 1/12
12
ST901T
STD901T
High voltage NPN Darlington transistor for ignition coil
Features
■High voltage special Darlington structure
■Very rugged bipolar technology
■High DC current gain
Application
■High ruggedness electronic ignition for small
engines
Description
The device is a high voltage NPN transistor in
monolithic special Darlington configuration
designed for applications such as electronic
ignition for small engines (scooters, lawnmowers,
chainsaws).
Figure 1. Internal schematic diagram
1
3
TA B
DPAK
123
TA B
TO-220
C(2, TAB)
B
(1)
E(3)
Table 1. Device summary
Order code Marking Packages Packaging
ST901T 901T TO-220 Tube
STD901T D901T DPAK Tape and reel
www.st.com
Contents ST901T, STD901T
2/12 Doc ID 4510 Rev 5
Contents
1 Electrical ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Electrical characteristics (curves) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
ST901T, STD901T Electrical ratings
Doc ID 4510 Rev 5 3/12
1 Electrical ratings
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
VCES Collector-emitter voltage (VBE = 0) 500 V
VCEO Collector-emitter voltage (IB = 0) 350 V
VEBO Emitter-base voltage (IC = 0) 5 V
IC Collector current 4 A
ICM Collector peak current (tp < 5 ms) 8 A
IB Base current 0.5 A
IBM Base peak current (tp < 5 ms) 2.5 A
Ptot Total dissipation at TC = 25 °C for ST901T 100 W
Ptot Total dissipation at TC = 25 °C for STD901T 35W
Tstg Storage temperature -65 to 150 °C
TJ Max. operating junction temperature 150 °C
Table 3. Thermal data
Symbol Parameter Value Unit
Rthj-case Thermal resistance junction-case max for ST901T 1.25 °C/W
Rthj-case Thermal resistance junction-case max for STD901T 3.57 °C/W
Electrical characteristics ST901T, STD901T
4/12 Doc ID 4510 Rev 5
2 Electrical characteristics
(Tcase = 25°C unless otherwise specified).
Table 4. Electrical characteristics
Symbol Parameter Test conditions Min. Typ. Max. Unit
ICES Collector cut-off current
(IE = 0)
VCE = 500 V
VCE = 500 V Tcase=125 °C
100
500
µA
µA
ICEO Collector cut-off current
(IB = 0)
VCE = 350 V
VCE = 350 V Tcase = 125 °C
100
500
µA
µA
IEBO Emitter cut-off current
(IC = 0) VEB = 5 V 10 µA
VCEO(sus)(1)
1. Pulse test: pulse duration ≤ 300 µs, duty cycle ≤ 2 %
Collector-emitter
sustaining voltage
(IB = 0 )
IC = 10 mA 350 V
VCE(sat)(1) Collector-emitter
saturation voltage IC = 2 A IB = 20 mA 2 V
VBE(sat)(1) Base-emitter saturation
voltage IC = 2 A IB = 20 mA 1.8 V
hFE DC current gain IC = 2 A VCE = 2 V
IC = 4 A VCE = 2 V
1800
500
3800
Functional test VCC = 24 V Vclamp = 350 V
L = 4 mH 4A
ts
tf
Inductive load
storage time
fall time
VCC = 12 V L = 4 mH
IC = 2 A Vclamp = 250 V
IB(on) = 20 mA VBE(off) = -3 V
15
1.5
µs
µs
ST901T, STD901T Electrical characteristics
Doc ID 4510 Rev 5 5/12
2.1 Electrical characteristics (curves)
Figure 2. Collector-emitter saturation
voltage (hFE = 100)
Figure 3. Base-emitter saturation
voltage (hFE = 100)
Figure 4. DC current gain (VCE = 2 V) Figure 5. DC current gain (VCE = 5 V)
AM08502v1
0.4
0.6
0.8
1
1.2
1.4
0.1 1 10
V
CE(sat)
(V)
I
C
(A)
T
J
= -40 °C
T
J
= 25
T
J
= 125 °C
°C
AM08503v1
0.8
1
1.2
1.4
1.6
1.8
0.1 1
V
BE(s at)
(V)
I
C
(A)
T
J
= -40
T
J
= 25
T
J
= 125
°C
°C
°C
AM08504v1
100
1000
0.1 1
hFE
IC(A)
TJ = -40
TJ= 25
TJ= 125
°C
°C
°C
AM08508v1
100
1000
10000
0.1 1
h
FE
I
C
(A)
T
J
= -40
T
J
= 25 T
J
= 125
°C
°C
°C
Package mechanical data ST901T, STD901T
6/12 Doc ID 4510 Rev 5
3 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com. ECOPACK
is an ST trademark.
ST901T, STD901T Package mechanical data
Doc ID 4510 Rev 5 7/12
Table 5. TO-220 type A mechanical data
Dim.
mm
Min. Typ. Max.
A 4.40 4.60
b 0.61 0.88
b1 1.14 1.70
c 0.48 0.70
D 15.25 15.75
D1 1.27
E10 10.40
e 2.40 2.70
e1 4.95 5.15
F1.231.32
H1 6.20 6.60
J1 2.40 2.72
L1314
L1 3.50 3.93
L20 16.40
L30 28.90
∅P3.75 3.85
Q 2.65 2.95
Package mechanical data ST901T, STD901T
8/12 Doc ID 4510 Rev 5
Figure 6. TO-220 type A drawing
0015988_typeA_Rev_S
ST901T, STD901T Package mechanical data
Doc ID 4510 Rev 5 9/12
Table 6. DPAK (TO-252) mechanical data
Dim.
mm
Min. Typ. Max.
A 2.20 2.40
A1 0.90 1.10
A2 0.030.23
b 0.64 0.90
b4 5.20 5.40
c 0.45 0.60
c2 0.48 0.60
D 6.00 6.20
D1 5.10
E 6.40 6.60
E1 4.70
e2.28
e1 4.40 4.60
H9.3510.10
L1
L1 2.80
L2 0.80
L4 0.60 1
R0.20
V2 0° 8°
Package mechanical data ST901T, STD901T
10/12 Doc ID 4510 Rev 5
Figure 7. TO-252 (DPAK) drawings
0068772_G
ST901T, STD901T Revision history
Doc ID 4510 Rev 5 11/12
4 Revision history
Table 7. Document revision history
Date Revision Changes
14-Oct-2004 1 First release.
15-Jan-2005 2 DC current gain range has been modified.
25-Feb-2005 3Added four drawings on page 3.
13-Oct-2005 4 Updated package mechanical data
11-Feb-2011 5 Inserted new order code STD901T
ST901T, STD901T
12/12 Doc ID 4510 Rev 5
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