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Partno	Mfg	Dc	Qty	Available	Descript
BULD741	ST	N/a	2	avai	High voltage fast-switching NPN power transistor

BULD741 ,High voltage fast-switching NPN power transistorElectrical characteristicsSymbol Parameter Test conditions Min. Typ. Max. UnitCollector cut-off cur ..
BULD742C ,HIGH VOLTAGE FAST SWITCHING NPN POWER TRANSISTORElectrical characteristicsSymbol Parameter Test Conditions Min. Typ. Max. UnitCollector cut-off cur ..
BULK128 ,HIGH VOLTAGE FAST-SWITCHING NPN POWER TRANSISTORAPPLICATIONS: 21■ ELECTRONIC BALLASTS FORFLUORESC ..
BULK128DB ,HIGH VOLTAGE FAST-SWITCHING NPN POWER TRANSISTORAPPLICATIONS: SOT-82■ ELECTRONIC BALLASTS FORFLUO ..
BULK128D-B ,HIGH VOLTAGE FAST-SWITCHING NPN POWER TRANSISTORBULK128D-B®HIGH VOLTAGE FAST-SWITCHINGNPN POWER TRANSISTOR■ STMicroelectronics PREFERREDSALESTYPE ■ ..
BULT118 ,HIGH VOLTAGE FAST-SWITCHING NPN POWER TRANSISTORSAPPLICATIONS: ■ ELECTRONIC BALLASTS FORFLUORESCEN ..
C25P20FR , LOW FORWARD VOLTAGE DROP
C25P40FR , LOW FORWARD VOLTAGE DROP
C2611 , Collector-emitter Voltage: V(BR)CEO=400V, Collector Current: IC=0.2A
C2611 , Collector-emitter Voltage: V(BR)CEO=400V, Collector Current: IC=0.2A
C2611 , Collector-emitter Voltage: V(BR)CEO=400V, Collector Current: IC=0.2A
C2625 , 700/800 WATTS (AC) DC/D CSINGLE OUTPUT

BULD741
High voltage fast-switching NPN power transistor
July 2007 Rev 2 1/11
Table 1. Device summary
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
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.
Applications Electronic ballast for fluorescent lighting Switch mode power supplies.
Figure 1. Internal schematic diagram
Electrical ratings BULD741
2/11 Electrical ratings
Table 3. Thermal data
Table 2. Absolute maximum rating
BULD741 Electrical characteristics
3/11
2 Electrical characteristics case = 25°C unless otherwise specified)
Note (1) Pulsed duration = 300µs, duty cycle ≤1.5%
Table 4. Electrical characteristics
Electrical characteristics BULD741
4/11
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
BULD741 Electrical characteristics
5/11
Figure 8. Base-emitter saturation
voltage
Figure 9. 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
Electrical characteristics BULD741
6/11
2.2 Test circuits
Figure 14. Resistive load switching test circuit
Figure 15. Energy rating test circuit

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