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BUL741
BUL741FP
High voltage fast-switching NPN power transistors
Features
High voltage capability
Low spread of dynamic parameters
Minimum lot-to-lot spread for reliable operation
Very high switching speed
3 3
2 2
1
Applications 1
Electronic ballast for fluorescent lighting TO-220 TO-220FP
Switch mode power supplies.
Description
Figure 1. Internal schematic diagram
The devices are 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.
Table 1. Device summary
Order codes Marking Packages Packaging
BUL741 BUL741 TO-220 Tube
BUL741FP BUL741FP TO-220FP Tube
August 2009 Doc ID 13406 Rev 3 1/12
www.st.com 12
Contents BUL741, BUL741FP
Contents
1 Electrical ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Typical characteristic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2/12 Doc ID 13406 Rev 3
BUL741, BUL741FP Electrical ratings
1 Electrical ratings
Table 2. Absolute maximum rating
Symbol Parameter Value Unit
VCES Collector-emitter voltage (VBE = 0) 1050 V
VCEO Collector-emitter voltage (IB = 0) 400 V
VEBO Emitter-base voltage (IC = 0, IB = 2 A, tP < 10ms) V(BR)EBO V
IC Collector current 2.5 A
ICM Collector peak current (tP < 5 ms) 5 A
IB Base current 1.5 A
IBM Base peak current (tP < 5ms) 3 A
Total dissipation at Tc = 25