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BULD741
High voltage fast-switching NPN power transistor
Features

High voltage capability Low spread of dynamic parameters Minimum lot-to-lot spread for reliable operation Very high switching speed
3 1
DPAK TO-252 IPAK TO-251
Description
The device is manufactured using high voltage Multi-Epitaxial Planar technology for high switching speeds and high voltage capability. Thanks to an increased intermediate layer, it has an intrinsic ruggedness which enables the transistor to withstand an high collector current level during breakdown condition, without using the transil protection usually necessary in typical converters for lamp ballast.
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Figure 1.
Internal schematic diagram
Applications

Electronic ballast for fluorescent lighting Switch mode power supplies.
Table 1.
Device summary
Marking BULD741 BULD741 Package DPAK IPAK Packaging Tape & reel Tube
Order codes BULD741T4 BULD741-1
July 2007
Rev 2
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Electrical ratings
BULD741
1
Electrical ratings
Table 2.
Symbol VCES VCEO VEBO IC ICM IB IBM Ptot Tstg TJ
Absolute maximum rating
Parameter Collector-emitter voltage (V BE = 0) Collector-emitter voltage (IB = 0) Emitter-base voltage (IC = 0, IB = 2A, tP < 10ms) Collector current Collector peak current (tP < 5ms) Base current Base peak current (tP < 5ms) Total dissipation at T c = 25C Storage temperature Max. operating junction temperature Value 1050 400 V(BR)EBO 2.5 5 1.5 3 30 -65 to 150 150 Unit V V V A A A A W C C
Table 3.
Symbol Rthj-case
Thermal data
Parameter Thermal resistance junction-case __max Value 4.16 Unit C/W
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BULD741
Electrical characteristics
2
Electrical characteristics
(Tcase = 25C unless otherwise specified) Table 4.
Symbol ICES ICEO V(BR)EBO
Electrical characteristics
Parameter Collector cut-off current (VBE =0V) Collector cut-off current (IB =0) Emitter-base breakdown voltage (IC = 0) Test conditions VCE =1050V VCE =400V IE =1mA IC =10mA 400 IC =0.7A IC =2A IC =2A IC =0.1A IC =0.45A VCC =125V VBE(off) =-5V L =2mH VBE(off) =-5V C =1.8nF 5 IB =0.14A IB =0.6A IB =0.6A VCE =5V VCE =3V IC =1A 2.5 350 3.5 500 s ns mJ 48 25 450 0.15 0.5 1.1 70 35 0.5 1.5 1.5 100 50 V V V V 15 Min. Typ. 0.2 10 19 Max. 10 250 24 Unit A A V
Collector-emitter VCEO(sus) (1) sustaining voltage (IB = 0) VCE(sat) (1) Collector-emitter saturation voltage Base-emitter saturation voltage DC current gain Resistive load Storage time Fall time Repetitive avalanche energy
VBE(sat) (1) hFE
ts tf Ear
IB1 = -IB2 =0.2A tp = 300s
Note (1) Pulsed duration = 300s, duty cycle 1.5%
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Electrical characteristics
BULD741
2.1
Electrical characteristics (curves)
Figure 2. Safe operating area Figure 3. Derating curve
Figure 4.
Output characteristics
Figure 5.
Reverse biased safe operating area
Figure 6.
DC current gain
Figure 7.
DC current gain
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BULD741 Figure 8. Base-emitter saturation voltage Figure 9.
Electrical characteristics Collector-emitter saturation voltage
Figure 10. Resistive load switching on times
Figure 11. Resistive load switching on times
Figure 12. Resistive load switching off times
Figure 13. Resistive load switching off times
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Electrical characteristics
BULD741
2.2
Test circuits
Figure 14. Resistive load switching test circuit
1) Fast electronic switch 2) Non-inductive resistor
Figure 15. Energy rating test circuit
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BULD741
Package mechanical data
3
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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Package mechanical data
BULD741
TO-252 (DPAK) MECHANICAL DATA
DIM. MIN. A A1 A2 B B2 C C2 D E G H L2 L4 V2 0.60 0o 2.20 0.90 0.03 0.64 5.20 0.45 0.48 6.00 6.40 4.40 9.35 0.8 1.00 8o 0.024 0o mm TYP. MAX. 2.40 1.10 0.23 0.90 5.40 0.60 0.60 6.20 6.60 4.60 10.10 MIN. 0.087 0.035 0.001 0.025 0.204 0.018 0.019 0.236 0.252 0.173 0.368 0.031 0.039 0o inch TYP. MAX. 0.094 0.043 0.009 0.035 0.213 0.024 0.024 0.244 0.260 0.181 0.398
P032P_B
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BULD741
Package mechanical data
TO-251 (IPAK) MECHANICAL DATA
DIM. A A1 A3 B B2 B3 B5 B6 C C2 D E G H L L1 L2 V1 0.45 0.48 6.00 6.40 4.40 15.90 9.00 0.80 0.80 10o 0.30 0.95 0.60 0.60 6.20 6.60 4.60 16.30 9.40 1.20 1.00 0.018 0.019 0.237 0.252 0.173 0.626 0.354 0.031 0.031 10o mm MIN. 2.20 0.90 0.70 0.64 5.20 TYP. MAX. 2.40 1.10 1.30 0.90 5.40 0.85 0.012 0.037 0.024 0.024 0.244 0.260 0.181 0.642 0.370 0.047 0.039 MIN. 0.087 0.035 0.028 0.025 0.204 inch TYP. MAX. 0.094 0.043 0.051 0.035 0.213 0.033
P032N_E
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Revision history
BULD741
4
Revision history
Table 5.
Date 20-Dec-2006 09-Jul-2007
Revision history
Revision 1 2 Initial release. Changes
Updated package names in page 1, added figure 4, updated figure 12 and 13.
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BULD741
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