December 2009 Doc ID 1004 Rev 4 1/13
13
BU931
BU931P, BU931T
High voltage ignition coil driver
NPN power Darlington transistors
Features
■Very rugged Bipolar technology
■High operating junction temperature
■Wide range of packages
Application
■High ruggedness electronic ignitions
Description
The devices are bipolar Darlington transistors
manufactured using multi-epitaxial planar
technology. They have been properly designed to
be used in automotive environment as electronic
ignition power actuators.
Figure 1. Internal schematic diagrams
TO-3
TO-220
1
2
123
1
2
3
TO-247
TA B
TAB
for TO-3 for TO-220
and TO-247
Table 1. Device summary
Order codes Marking Packages Packaging
BU931 BU931 TO-3 Tray
BU931P BU931P TO-247 Tube
BU931T BU931T TO-220 Tube
www.st.com
Content BU931, BU931P, BU931T
2/13 Doc ID 1004 Rev 4
Content
1 Electrical ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Electrical characteristics (curves) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
BU931, BU931P, BU931T Electrical ratings
Doc ID 1004 Rev 4 3/13
1 Electrical ratings
Table 2. Absolute maximum ratings
Symbol Parameter
Value
Unit
BU931 BU931P BU931T
VCES Collector-emitter voltage (VBE = 0) 500 V
VCEO Collector-emitter voltage (IB = 0) 400 V
VEBO Emitter-base voltage (IC = 0) 5 V
ICCollector current 15 10 A
ICM Collector peak current 30 20 A
IBBase current 1 A
IBM Base peak current 5 A
PTOT Total dissipation at Tc = 25 °C 175 135 125 W
TSTG Storage temperature -65 to 200 -65 to 175 °C
TJMax. operating junction temperature 200 175
Table 3. Thermal data
Symbol Parameter
Value
Unit
BU931 BU931P BU931T
RthJC
Thermal resistance junction-case
max. 11.11.2°C/W
Electrical characteristics BU931, BU931P, BU931T
4/13 Doc ID 1004 Rev 4
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
(VBE = 0)
VCE = 500 V
VCE = 500 V TC = 125 °C
100
0.5
µA
mA
ICEO
Collector cut-off current
(IB = 0)
VCE = 450 V
VCE = 450 V TC = 125 °C
100
0.5
µA
mA
IEBO
Emitter cut-off current
(IC = 0) VEB = 5 V 20 mA
VCEO(sus)(1)
1. Pulse test: pulse duration ≤ 300 µs, duty cycle ≤ 2 %
Collector-emitter
sustaining voltage (IB = 0)
IC = 100 mA L = 10 mH
Vclamp = 400 V
see Figure 14
400 V
VCE(sat) (1) Collector-emitter
saturation voltage
IC = 7 A IB = 70 mA
IC = 8 A IB = 100 mA
IC = 10 A IB = 250 mA
1.6
1.8
1.8
V
V
V
VBE(sat) (1) Base-emitter saturation
voltage
IC = 7 A IB = 70 mA
IC = 8 A IB = 100 mA
IC = 10 A IB = 250 mA
2.2
2.4
2.5
V
V
V
hFE (1) DC current gain IC = 5 A VCE = 10 V 300
VFDiode forward voltage IF = 10 A 2.5 V
Functional test
VCC = 24 V L = 7 mH
Vclamp = 400 V
see Figure 11
8A
ts
tf
Inductive Load
Storage time
Fall time
IC = 7 A Vclamp = 300 V
IB = 70 mA L = 7 mH
VBE = 0 RBE = 47 Ω
VCC = 12 V see Figure 13
15
0.5
µs
µs
BU931, BU931P, BU931T Electrical characteristics
Doc ID 1004 Rev 4 5/13
2.1 Electrical characteristics (curves)
Figure 2. Safe operating area for BU931 and
BU931P
Figure 3. Safe operating area for BU931T
Figure 4. DC current gain Figure 5. Switching time inductive load
Figure 6. Collector-emitter saturation voltage
@ hFE = 50
Figure 7. Collector-emitter saturation voltage
@ hFE = 100
Electrical characteristics BU931, BU931P, BU931T
6/13 Doc ID 1004 Rev 4
Figure 8. Collector-emitter saturation voltage Figure 9. Base-emitter saturation voltage @
hFE = 50
Figure 10. Base-emitter saturation voltage @
hFE = 100
BU931, BU931P, BU931T Test circuits
Doc ID 1004 Rev 4 7/13
3 Test circuits
Figure 11. Functional test circuit Figure 12. Functional test waveforms
Figure 13. Switching time test circuit Figure 14. Sustaining voltage test circuit
Package mechanical data BU931, BU931P, BU931T
8/13 Doc ID 1004 Rev 4
4 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.
BU931, BU931P, BU931T Package mechanical data
Doc ID 1004 Rev 4 9/13
DIM.
mm.
min. typ max.
A11.00 13.10
B0.9 17.15
C1.50 1.65
D8.328.92
E 19.00 20.00
G 10.70 11.10
N 16.50 17.20
P 25.00 26.00
R4.00 4.09
U38.50 39.30
V30.00 30.30
TO-3 mechanical data
0015923C
Package mechanical data BU931, BU931P, BU931T
10/13 Doc ID 1004 Rev 4
Dim. mm.
Min. Typ Max.
A4.855.15
A1 2.20 2.60
b1.0 1.40
b1 2.0 2.40
b23.0 3.40
c0.40 0.80
D19.85 20.15
E 15.45 15.75
e5.45
L 14.20 14.80
L1 3.70 4.30
L2 18.50
øP 3.55 3.65
øR 4.50 5.50
S5.50
TO-247 Mechanical data
BU931, BU931P, BU931T Package mechanical data
Doc ID 1004 Rev 4 11/13
TO-220 type A mechanical data
Dim mm
Min Typ Max
A 4.40 4.60
b0.61 0.88
b1 1.14 1.70
c0.480.70
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
L3028.90
∅P3.75 3.85
Q 2.65 2.95
0015988_Rev_S
Revision history BU931, BU931P, BU931T
12/13 Doc ID 1004 Rev 4
5 Revision history
Table 5. Document revision history
Date Revision Changes
18-Nov-2008 3 Package changed from TO-218 to TO-247 for BU931P.
Inserted type in TO-220 (BU931T).
02-Dec-2009 4 Modified IC test condition value of VCEO(sus) parameter Table 4 on
page 4, updated TO-220 package mechanical data.
BU931, BU931P, BU931T
Doc ID 1004 Rev 4 13/13
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