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BU941 BU941P
High voltage ignition coil driver NPN power Darlington transistors
Features

Very rugged Bipolar technology High operating junction temperature Integrated antiparallel collector-emitter diode
1 2
2 1
Applications
3
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.
TO-3
TO-247
Figure 1.
Internal schematic diagrams
for TO-3
for TO-247
Table 1.
Device summary
Marking BU941 BU941P Package TO-3 TO-247 Packaging Tray Tube
Order codes BU941 BU941P
November 2008
Rev 3
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www.st.com 12
Content
BU941, BU941P
Content
1 2 Electrical ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Electrical characteristics (curves) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 4 5
Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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BU941, BU941P
Electrical ratings
1
Electrical ratings
Table 2.
Symbol VCES VCEO VEBO IC ICM IB IBM PTOT Tstg TJ
Absolute maximum ratings
Value Parameter BU941 Collector-emitter voltage (VBE = 0) Collector-emitter voltage (IB = 0) Emitter-base voltage (IC = 0) Collector current Collector peak current Base current Base peak current Total dissipation at Tc = 25 C Storage temperature Max. operating junction temperature 180 -65 to 200 200 500 400 5 15 30 1 5 155 -65 to 175 C 175 BU941P V V V A A A A W Unit
Table 3.
Symbol
Thermal data
Parameter Value 0.97 Unit C/W
Rthj-case Thermal resistance junction-case max.
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Electrical characteristics
BU941, BU941P
2
Electrical characteristics
(Tcase = 25 C; unless otherwise specified)
Table 4.
Symbol ICES ICEO IEBO
Electrical characteristics
Parameter Collector cut-off current (VBE = 0) Collector cut-off current (IB = 0) Emitter cut-off current (IC = 0) Test conditions VCE = 500 V VCE = 500 V VCE = 450 V VCE = 450 V VEB = 5 V L = 10 mH 400 IB = 100 mA IB = 250 mA IB = 300 mA IB = 100 mA IB = 250 mA IB = 300 mA VCE = 10 V 300 2.5 L = 7 mH 10 A V 1.6 1.8 2 2.2 2.5 2.7 V V V V V V V Min. Typ. Max. 100 0.5 100 0.5 20 Unit A mA A mA mA
TC = 125 C TC = 125 C
VCEO(sus)(1)
IC = 10 mA Collector-emitter Vclamp = 400 V sustaining voltage (IB = 0) see Figure 12 Collector-emitter saturation voltage IC = 8 A IC = 10 A IC = 12 A IC = 8 A IC = 10 A IC = 12 A IC = 5 A IF = 10 A VCC = 24 V Vclamp = 400 V see Figure 9
VCE(sat) (1)
VBE(sat) (1) hFE(1) VF
Base-emitter saturation voltage DC current gain Diode forward voltage Functional test
ts tf
Inductive Load Storage time Fall time
Vclamp = 300 V IC = 7 A L = 7 mH IB = 70 mA VBE = 0 RBE = 47 VCC = 12 V see Figure 11
15 0.5
s s
1. Pulsed duration = 300 s, duty cycle 1.5%
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BU941, BU941P
Electrical characteristics
2.1
Figure 2.
Electrical characteristics (curves)
Safe operating area Figure 3. DC current gain
Figure 4.
DC current gain
Figure 5.
Collector-emitter saturation voltage
Figure 6.
Collector-emitter saturation voltage Figure 7.
Base-emitter saturation voltage
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Electrical characteristics Figure 8. Switching time inductive load
BU941, BU941P
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BU941, BU941P
Test circuits
3
Figure 9.
Test circuits
Functional test circuit Figure 10. Functional test wafeforms
Figure 11. Switching time test circuit
Figure 12. Sustaining voltage test circuit
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Package mechanical data
BU941, BU941P
4
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect . The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com
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BU941, BU941P
Package mechanical data
TO-3 mechanical data
mm. DIM. min. A B C D E G N P R U V 11.00 0.97 1.50 8.32 19.00 10.70 16.50 25.00 4.00 38.50 30.00 typ max. 13.10 1.15 1.65 8.92 20.00 11.10 17.20 26.00 4.09 39.30 30.30
0015923C
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Package mechanical data
BU941, BU941P
TO-247 Mechanical data
mm. Min. 4.85 2.20 1.0 2.0 3.0 0.40 19.85 15.45 5.45 14.20 3.70 18.50 3.55 4.50 5.50 3.65 5.50 14.80 4.30 Typ Max. 5.15 2.60 1.40 2.40 3.40 0.80 20.15 15.75
Dim. A A1 b b1 b2 c D E e L L1 L2 oP oR S
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BU941, BU941P
Revision history
5
Revision history
Table 5.
Date 21-Jun-2004 18-Nov-2008
Document revision history
Revision 2 3 Package changed from TO-218 to TO-247 for BU941P. Changes
11/12
BU941, BU941P
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