January 2008 Rev 7 1/11
11
BU941ZP
BU941ZPFI
High voltage ignition coil driver NPN power Darlington transistors
Features
■Very rugged bipolar technology
■Built in clamping Zener
■High operating junction temperature
■Fully insulated package (U.L. compliant) for
easy mounting
Applications
■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 diagram
1
2
3
TO-247 TO-3PF
Table 1. Device summary
Order code Marking Packages Packaging
BU941ZP BU941ZP TO-247 Tube
BU941ZPFI BU941ZPFI TO-3PF Tube
www.st.com
Absolute maximum ratings BU941ZP BU941ZPFI
2/11
1 Absolute maximum ratings
Table 3. Thermal data
Table 2. Absolute maximum ratings
Symbol Parameter
Value
Unit
BU941ZP BU941ZPFI
VCEO Collector-emitter voltage (IB = 0) 350 V
VEBO Emitter-base voltage (IC = 0) 5 V
ICCollector current 15 A
ICM Collector peak current (tp < 5ms) 30 A
IBBase current 1 A
IBM Base peak current (tp < 5ms) 5 A
Ptot Total dissipation at Tc ≤ 25 °C 155 65 W
Visol
Insulation withstand voltage (RMS) from all three
leads to external heatsink 2500 V
Tstg Storage temperature -65 to 175 -65 to 175 °C
TJMax. operating junction temperature 175 175 °C
Symbol Parameter TO-247 TO-3PF Unit
Rthj-case Thermal resistance junction-case __max 0.97 2.3 °C/W
BU941ZP BU941ZPFI Electrical characteristics
3/11
2 Electrical characteristics
(Tcase = 25°C; unless otherwise specified)
Table 4. Electrical characteristics
Symbol Parameter Test conditions Min. Typ. Max. Unit
ICEO
Collector cut-off current
(IB = 0)
VCE = 300 V
VCE = 300 V Tj = 125 °C
100
0.5
µA
mA
IEBO
Emitter cut-off current
(IC = 0) VEB = 5 V 20 mA
VClamp(1)
1. Pulsed duration = 300 µs, duty cycle ≤ 1.5%.
Clamping voltage IC = 100 mA 350 500 V
VCE(sat)(1) Collector-emitter
saturation voltage
IC = 8 A IB = 100 mA
IC = 10 A IB = 250 mA
IC = 12 A IB = 300 mA
1.8
1.8
2
V
V
V
VBE(sat)(1) Collector-emitter base
voltage
IC = 8 A IB = 100 mA
IC = 10 A IB = 250 mA
IC = 12 A IB = 300 mA
2.2
2.5
2.7
V
V
V
hFE(1) DC current gain IC = 5 A VCE = 10 V 300
Functional test VCC = 24 V L = 7 mH
Figure 13. 10 A
ts
tf
Inductive load
Storage time
Fall time
VCC = 12 V L = 7 mH
VBE(off) = 0 V RBE = 47 Ω
VClamp = 300 V IC = 7 A
IB1 = 70 mA
15
0.5
µs
µs
VFDiode forward voltage IF = 10 A 2.5 V
Electrical characteristics BU941ZP BU941ZPFI
4/11
2.1 Electrical characteristic (curves)
Figure 2. Safe operating area Figure 3. Derating curve
Figure 4. DC current gain Figure 5. DC current gain
Figure 6. Collector-emitter saturation
voltage
Figure 7. Base-emitter saturation
voltage
BU941ZP BU941ZPFI Electrical characteristics
5/11
2.2 Test circuit
Figure 11. Functional test circuit
Figure 8. Base-emitter saturation
voltage
Figure 9. Base-emitter saturation
voltage
Figure 10. Collector-emitter saturation
voltage
Electrical characteristics BU941ZP BU941ZPFI
6/11
Figure 12. Functional test waveforms
Figure 13. Switching time test circuit
BU941ZP BU941ZPFI Package mechanical data
7/11
3 Package mechanical data
In order to meet environmental requirements, ST offers these devices in
ECOPACK® 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
Package mechanical data BU941ZP BU941ZPFI
8/11
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
BU941ZP BU941ZPFI Package mechanical data
9/11
DIM. mm.
min. typ max.
A5.30 5.70
C2.803.20
D3.10 3.50
D1 1.80 2.20
E0.80 1.10
F 0.65 0.95
F2 1.80 2.20
G 10.30 11.50
G1 5.45
H 15.30 15.70
L9.80 10 10.20
L2 22.8023.20
L326.30 26.70
L4 43.20 44.40
L5 4.30 4.70
L6 24.30 24.70
L7 14.60 15
N1.80 2.20
R3.80 4.20
Dia3.40 3.80
TO-3PF mechanical data
7627132_C
Revision history BU941ZP BU941ZPFI
10/11
4 Revision history
Table 5. Document revision history
Date Revision Changes
03-Feb-2005 6
22-Jan-2008 7 Package change from TO-218 to TO-247 and from ISOWATT218 to
TO-3PF.
BU941ZP BU941ZPFI
11/11
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the
right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at an
y
time, without notice.
All ST products are sold pursuant to ST’s terms and conditions of sale.
Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no
liability whatsoever relating to the choice, selection or use of the ST products and services described herein.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this
document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products
or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such
third party products or services or any intellectual property contained therein.
UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED
WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS
OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.
UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT
RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING
APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY,
DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE
GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK.
Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void
any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, an
y
liability of ST.
ST and the ST logo are trademarks or registered trademarks of ST in various countries.
Information in this document supersedes and replaces all information previously supplied.
The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.
© 2008 STMicroelectronics - All rights reserved
STMicroelectronics group of companies
Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -
Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America
www.st.com
