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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
1/12
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
2/12
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.
3/12
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%
4/12
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
5/12
Electrical characteristics Figure 8. Switching time inductive load
BU941, BU941P
6/12
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
7/12
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
8/12
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
9/12
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
10/12
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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Price & Availability of BU941

Part #	Manufacturer	Description	Price	BuyNow Qty.
BU941ZT 47AK6461	STMicroelectronics	Bipolar Transistor, 350V, 15A, To-218 Rohs Compliant: Yes \|Stmicroelectronics BU941ZT	500: USD2.49 250: USD2.63 100: USD2.76 50: USD3.17 25: USD3.42 10: USD3.66 1: USD3.91	978
BU941ZPFI 25M7960	STMicroelectronics	Bipolar (Bjt) Single Transistor, Darlington, Npn, 350 V, 65 W, 15 A, 300 Rohs Compliant: Yes \|Stmicroelectronics BU941ZPFI	510: USD2.49 270: USD2.52 120: USD2.55 60: USD2.72 25: USD2.89 10: USD3.22 1: USD3.47	24
BU941 89K0488	STMicroelectronics	Darlington Transistor, Npn, 500V, To-3; Transistor Polarity:Npn; No. Of Pins:2Pins; Transistor Mounting:Through Hole; Operating Temperature Max:200°C; Product Range:-; Qualification:-; Collector Emitter Voltage Max:500V Rohs Compliant: Yes \|Stmicroelectronics BU941		0
BU941ZT 89K0490	STMicroelectronics	Darlington Transistor, Npn, 350V; Transistor Polarity:Npn; Collector Emitter Voltage Max:350V; Continuous Collector Current:15A; Power Dissipation:150W; Transistor Mounting:Through Hole; No. Of Pins:3Pins; Transition Frequency:- Rohs Compliant: Yes \|Stmicroelectronics BU941ZT		0
BU941ZPFI 56P6037	STMicroelectronics	Ptd Igbt & Ipm \|Stmicroelectronics BU941ZPFI	1000: USD3.31 500: USD3.52 250: USD3.79	0

Part #	Manufacturer	Description	Price	BuyNow Qty.
BU941ZT 497-2740-5-ND	STMicroelectronics	TRANS NPN DARL 350V 15A TO220	5000: USD1.56188 2000: USD1.62798 1000: USD1.72893 500: USD2.0192 100: USD2.2716 50: USD2.6502 1: USD3.34	3353
BU941ZPFI 497-2542-5-ND	STMicroelectronics	TRANS NPN DARL 350V 15A TO3PF	5010: USD1.85564 2010: USD1.93417 1020: USD2.05412 510: USD2.39896 120: USD2.69883 30: USD3.14867 1: USD3.97	1016

Part #	Manufacturer	Description	Price	BuyNow Qty.
BU941ZT BU941ZT	STMicroelectronics	Trans Darlington NPN 350V 15A 3-Pin(3+Tab) TO-220 Tube - Rail/Tube (Alt: BU941ZT)	100000: USD1.6306 50000: USD1.66808 10000: USD1.70557 5000: USD1.74305 2100: USD1.78054 1100: USD1.81802 1000: USD1.85551	2000
BU941ZPFI BU941ZPFI	STMicroelectronics	Trans Darlington NPN 350V 15A 3-Pin(3+Tab) TO-3PF Tube - Rail/Tube (Alt: BU941ZPFI)	60000: USD1.92044 30000: USD1.96459 6000: USD2.00873 3000: USD2.05288 1800: USD2.09703 1200: USD2.14118 600: USD2.18533	0

Part #	Manufacturer	Description	Price	BuyNow Qty.
BU941ZT 511-BU941ZT	STMicroelectronics	Darlington Transistors NPN Power Darlington	1: USD3.41 10: USD3.21 25: USD2.7 100: USD2.32 250: USD2.31 500: USD2.06 1000: USD1.76 2000: USD1.66 5000: USD1.59	949
BU941ZPFI 511-BU941ZPFI	STMicroelectronics	Darlington Transistors NPN Power Darlington	1: USD3.93 10: USD3.3 25: USD3.12 100: USD2.67 300: USD2.52 600: USD2.37 1200: USD2.03 2700: USD1.91	1093

Part #	Manufacturer	Description	Price	BuyNow Qty.
BU941ZPFI(575B) V79:2366_17796873	STMicroelectronics	Trans Darlington NPN 350V 15A 65000mW 3-Pin(3+Tab) TO-3PF Tube	1: USD1.5065	14096

Part #	Manufacturer	Description	Price	BuyNow Qty.
AVBU941208S 72079939	POBCO Inc.	V-Belt Pulley, White UHMW, inAin Section V Belt, 5.85in OD, 1/2in Bore \| POBCO Inc. AVBU941208S	1: USD54.8	0

Part #	Manufacturer	Description	Price	BuyNow Qty.
BU941ZT	STMicroelectronics	Automotive-grade high voltage ignition coil driver NPN power Darlington transistor	1: USD3.34 10: USD3.15 25: USD2.65 100: USD2.27 250: USD2.26 500: USD2.02	939
BU941ZPFI	STMicroelectronics	Automotive-grade high voltage ignition coil driver NPN power Darlington transistor	1: USD3.85 10: USD3.23 25: USD3.06 100: USD2.62 300: USD2.47	1089

Part #	Manufacturer	Description	Price	BuyNow Qty.
BU941ZPFI(575B) 80928187	STMicroelectronics	Trans Darlington NPN 350V 15A 65000mW 3-Pin(3+Tab) TO-3PF Tube	5: USD1.5065	14096
BU941ZT 31347064	STMicroelectronics	Trans Darlington NPN 350V 15A 150000mW Automotive AEC-Q101 3-Pin(3+Tab) TO-220AB Tube	1000: USD1.8125 500: USD1.925 200: USD2.125 100: USD2.1375 50: USD2.2625 12: USD2.6875 9: USD3.8125	1016
BU9414FV-E2 36526946	ROHM Semiconductor	Audio Processor Bass/Middle/Treble 0MHz to 0.4MHz 40-Pin SSOP-B	50: USD1.628 45: USD1.6925	50
BU941ZPFI 73150355	STMicroelectronics	Trans Darlington NPN 350V 15A 65000mW Automotive AEC-Q101 3-Pin(3+Tab) TO-3PF Tube	27: USD3.3864	27

Part #	Manufacturer	Description	Price	BuyNow Qty.
BU941	SGS Thomson		4: USD7.656 2: USD8.7 1: USD10.44	4
BU9414FV-E2	ROHM Semiconductor		32: USD2.188 10: USD2.4068 1: USD3.282	40
BU941P	STMicroelectronics	Bipolar Junction Transistor, Darlington, NPN Type, TO-218VAR	12: USD1.695 4: USD2.26 1: USD3.39	50
BU941ZP	STMicroelectronics	Bipolar Junction Transistor, Darlington, NPN Type, TO-218VAR	39: USD1.4625 12: USD1.95 1: USD2.4375	75

Part #	Manufacturer	Description	Price	BuyNow Qty.
BU941ZT BU941ZT	STMicroelectronics	Transistor: NPN; bipolar; Darlington; 350V; 15A; 150W; TO220AB	100: USD2.33 50: USD2.37 10: USD2.63 1: USD3.24	0
BU941ZPFI BU941ZPFI	STMicroelectronics	Transistor: NPN; bipolar; Darlington; 350V; 15A; 65W; TO3PF	120: USD2.57 30: USD2.75 10: USD3.05 3: USD3.45 1: USD3.84	41

Part #	Manufacturer	Description	Price	BuyNow Qty.
BU941ZPFI	STMicroelectronics	HIGH VOLTAGE IGNITION COIL DRIVER NPN POWER DARLINGTON TRANSISTOR Power Bipolar Transistor, 15A I(C), 350V V(BR)CEO, 1-Element, NPN, Silicon, Plastic/Epoxy, 3 Pin		300

Part #	Manufacturer	Description	Price	BuyNow Qty.
BU941ZT BU941ZT	STMicroelectronics	Trans Darlington NPN 350V 15A 3-Pin(3+Tab) TO-220 Tube (Alt: BU941ZT)		2700
BU941ZPFI BU941ZPFI	STMicroelectronics	Trans Darlington NPN 350V 15A 3-Pin(3+Tab) TO-3PF Tube (Alt: BU941ZPFI)		240

Part #	Manufacturer	Description	Price	BuyNow Qty.
BU941ZT C1S730200152240	STMicroelectronics	Trans Darlington NPN 350V 15A 150000mW Automotive 3-Pin(3+Tab) TO-220 Tube	1000: USD1.62 500: USD1.72 200: USD1.9 100: USD1.91 50: USD2.01 10: USD2.12 1: USD3.01	1016

Part #	Manufacturer	Description	Price	BuyNow Qty.
BU9414FV-E2	ROHM Semiconductor	RoHS(Ship within 1day) - D/C 2014	1000: USD1.094 500: USD1.096 100: USD1.102 50: USD1.123 10: USD1.144 1: USD1.177	50

Part #	Manufacturer	Description	Price	BuyNow Qty.
BU941ZT BU941ZT	STMicroelectronics	Trans Darlington NPN 350V 15A 3-Pin(3+Tab) TO-220 Tube (Alt: BU941ZT)		0
BU941ZPFI BU941ZPFI	STMicroelectronics	Trans Darlington NPN 350V 15A 3-Pin(3+Tab) TO-3PF Tube (Alt: BU941ZPFI)		0

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