July 2008 Rev 2 1/10
10
BULT118
High voltage fast-switching NPN power transistor
Features
■High voltage capability
■Minimum lot-to-lot spread for reliable operation
■Very high switching speed
Applications
■Electronic ballast for fluorescent lighting
■Flyback and forward single transistor low power
converters
Description
The device is manufactured using high voltage
multi-epitaxial planar technology for high
switching speeds and medium voltage capability.
It uses a cellular emitter structure with planar
edge termination to enhance switching speeds
while maintaining the wide RBSOA.
The device is designed for use in lighting
applications and low cost switch-mode power
supplies.
Figure 1. Internal schematic diagram
SOT-32
321
Table 1. Device summary
Order code Marking Package Packaging
BULT118 BULT118 SOT-32 Tube
www.st.com
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Electrical ratings BULT118
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1 Electrical ratings
Table 2. Absolute maximum rating
Symbol Parameter Value Unit
VCES Collector-emitter voltage (VBE = 0) 700 V
VCEO Collector-emitter voltage (IB = 0) 400 V
VEBO Emitter-base voltage (IC = 0) 9V
ICCollector current 2 A
ICM Collector peak current (tP < 5 ms) 4 A
IBBase current 1 A
IBM Base peak current (tP < 5 ms) 2 A
Ptot Total dissipation at Tc = 25 °C 45 W
Tstg Storage temperature -65 to 150 °C
TJMax. operating junction temperature 150 °C
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BULT118 Electrical characteristics
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2 Electrical characteristics
(Tcase = 25°C unless otherwise specified)
Table 3. Electrical characteristics
Symbol Parameter Test conditions Min. Typ. Max. Unit
ICES
Collector cut-off current
(VBE =0)
VCE = 700 V
VCE = 700 V TC = 125 °C
100
500
µA
µA
ICEO Collector-emitter leakage
current VCE = 400 V 250 µA
VEBO Emitter-base voltage IE = 10 mA 9V
VCEO(sus) (1)
Collector-emitter
sustaining voltage
(IB = 0)
IC = 10 mA 400 V
VCE(sat) (1) Collector-emitter
saturation voltage
IC = 0.5 A IB = 0.1 A
IC = 1 A _ IB = 0.2 A
IC = 2 A _ IB = 0.4 A
0.5
1
1.5
V
V
V
VBE(sat) (1) Base-emitter saturation
voltage
IC = 0.5 A IB = 0.1 A
IC = 1 A _ IB = 0.2 A
IC = 2 A _ IB = 0.4 A
1
1.2
1.3
V
V
V
hFE (1)
1. Pulsed duration = 300 µs, duty cycle ≤1.5 %
DC current gain
IC = 10 mA _ VCE = 5 V
IC = 0.5 A _ VCE = 5 V
IC = 2 A _ _ VCE = 5 V
10
10
8
50
tr
ts
tf
Resistive load
Rise time
Storage time
Fall time
IC = 1 A VCC= 125 V
IB1 =-IB2 = 0.2 A
0.4
3.2
0.25
0.7
4.5
0.4
µs
µs
µs
ts
tf
Inductive load
Storage time
Fall time
IC = 1 A IB1 = 0.2 A
VBE(off) = -5 V L= 50 mH
VClamp = 300 V
0.8
0.16
µs
µs
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Electrical characteristics BULT118
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2.1 Electrical characteristics (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
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BULT118 Electrical characteristics
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Figure 8. Inductive load fall time Figure 9. Inductive load storage time
Figure 10. Resistive load fall time Figure 11. Resistive load storage time
Figure 12. Reverse biased SOA
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Electrical characteristics BULT118
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2.2 Test circuits
Figure 13. Resistive load switching test circuit
Figure 14. Inductive load switching test circuit
1) Fast electronic switch
2) Non-inductive resistor
1) Fast electronic switch
2) Non-inductive resistor
3) Fast recovery rectifier
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BULT118 Package mechanical data
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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
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1 = EASE
COLLECTOR
guns»
2
3
51
m
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Package mechanical data BULT118
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DIM. mm.
MIN. TYP MAX.
A2.4 2.9
B 0.64 0.88
B1 0.39 0.63
D 10.5 11.05
E7.4 7.8
e 2.04 2.29 2.54
e1 4.07 4.58 5.08
L15.3 16
P2.9 3.2
Q3.8
Q1 1 1.52
H2 2.15
I1.27
SOT-32 (TO-126) MECHANICAL DATA
0016114E
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BULT118 Revision history
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4 Revision history
Table 4. Document revision history
Date Revision Changes
29-Sep-2003 1 Initial release.
10-Jul-2008 2 Updated: VCEO(sus) condition in Table 3 on page 3,
SOT-32 mechanical data, cover page
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