BUL743 - STMICROELECTRONICS - Datasheet.Directory

May 2009 Doc ID 15263 Rev 3 1/10

BUL743

High voltage fast-switching

NPN power transistor

Features

■Low spread of dynamic parameters

■High voltage capability

■Minimum lot-to-lot spread for reliable operation

■Very high switching speed

Applications

■Electronic ballast for fluorescent lighting up to

256 W (8 x 32 W)

■Switch mode power supplies

Description

The device is manufactured using the diffused

collector in planar technology adopting new and

enhanced high voltage structure. 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.

Figure 1. Internal schematic diagram

TO-220

123

Table 1. Device summary

Order code Marking Package Packaging

BUL743 BUL743 TO-220 Tube

www.st.com

Electrical ratings BUL743

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1 Electrical ratings

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

VCES Collector-emitter voltage (VBE = 0) 1200 V

VCEO Collector-emitter voltage (IB = 0) 500 V

VEBO Emitter-base voltage (IC = 0, IB = 6 A, tp < 10 ms) V(BR)EBO V

ICCollector current 12 A

ICM Collector peak current (tP < 5 ms) 24 A

IBBase current 6 A

IBM Base peak current (tP < 5 ms) 12 A

Ptot Total dissipation at Tc = 25 °C 100 W

Tstg Storage temperature -65 to 150 °C

TJMax. operating junction temperature 150 °C

Table 3. Thermal data

Symbol Parameter Value Unit

Rthj-case Thermal resistance junction - case 1.25 °C/W

Rthj-amb Thermal resistance junction - ambient 62.5 °C/W

BUL743 Electrical characteristics

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2 Electrical characteristics

(Tcase = 25 °C unless otherwise specified)

Table 4. Electrical characteristics

Symbol Parameter Test conditions Min. Typ. Max. Unit

ICES

Collector cut-off current

(VBE = 0) VCE = 1200 V 0.2 10 µA

ICEO

Collector cut-off current

(IB = 0) VCE = 500 V 10 250 µA

V(BR)EBO Emitter base breakdown

voltage (IC = 0) IE = 1 mA 15 19 24 V

VCEO(sus) (1)

1. Pulsed duration = 300 µs, duty cycle ≤ 1.5%

Collector-emitter

sustaining voltage

(IB = 0)

IC = 50 mA 500 V

VCE(sat) (1) Collector-emitter

saturation voltage

IC = 3 A _ IB = 0.6 A

IC = 10 A _ _ IB = 2.5 A

0.15

0.6

0.5

1.5

VBE(sat) (1) Base-emitter saturation

voltage IC = 10 A IB = 2.5 A 1.1 1.5 V

hFE (1) DC current gain IC = 0.5 A _ VCE = 5 V

IC = 2 A _ _ VCE = 3 V

Resistive load

Storage time

Fall time

IC = 6 A VCC = 125 V

IB(on) = -IB(off) = 1.2 A

tp = 300 µs VBE(off) = -5 V

2.5

400

3.8

500

µs

Ear Repetitive avalanche

energy

L = 2 mH C = 1.8 nF

VBE(off) = -5 V 3 mJ

Electrical characteristics BUL743

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2.1 Electrical characteristics (curves)

Figure 2. Safe operating area Figure 3. Derating curve

Figure 4. DC current gain (VCE = 3 V) Figure 5. DC current gain (VCE = 5 V)

Figure 6. Collector-emitter saturation

voltage

Figure 7. Base-emitter saturation voltage

BUL743 Electrical characteristics

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Figure 8. Output characteristics Figure 9. Reverse biased safe operating area

Figure 10. Resistive load switching time (on) Figure 11. Resistive load switching time (off)

Electrical characteristics BUL743

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2.2 Test circuits

Figure 12. Energy rating test circuit

Figure 13. Resistive load switching test circuit

1. Fast electronic switch

2. Non-inductive resistor

BUL743 Package mechanical data

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3 Package mechanical data

In order to meet environmental requirements, ST offers these devices in different grades of

ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®

specifications, grade definitions and product status are available at: www.st.com.

ECOPACK® is an ST trademark.

Package mechanical data BUL743

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TO-220 mechanical data

Dim mm inch

Min Typ Max Min Typ Max

A 4.40 4.60 0.1730.181

b0.61 0.88 0.024 0.034

b1 1.14 1.70 0.044 0.066

c0.480.70 0.0190.027

D 15.25 15.75 0.6 0.62

D1 1.27 0.050

E 10 10.40 0.393 0.409

e 2.40 2.70 0.094 0.106

e1 4.95 5.15 0.194 0.202

F1.231.32 0.0480.051

H1 6.20 6.60 0.244 0.256

J1 2.40 2.72 0.094 0.107

L1314 0.511 0.551

L1 3.50 3.93 0.137 0.154

L20 16.40 0.645

L3028.90 1.137

∅P3.75 3.85 0.147 0.151

Q2.65 2.95 0.104 0.116

BUL743 Revision history

Doc ID 15263 Rev 3 9/10

4 Revision history

Table 5. Document revision history

Date Revision Changes

09-Dec-2008 1 First release

20-Mar-2009 2 Added Section 2.1Section 2.1: Electrical characteristics (curves) on

page 4

25-May-2009 3 Document status promoted from preliminary data to datasheet

BUL743

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