STMicroelectronics-BU508AW

BU508AW  

High voltage NPN power transistor for standard  

definition CRT display  

Features  

■

State-of-the-art technology:  

– Diffused

 

collector “Enhanced generation”  

■

Stable performances versus operating  

temperature variation  

■

Low base-drive requirement  

3

■

Tight h

 

range at operating collector current  

FE  

2

1

■

High ruggedness  

■

TO-247 semi-insulated power package  

TO-247  

Applications  

■

Horizontal deflection output for CRT TV  

■

Switch mode power supplies for CRT TV  

Figure 1.  

Internal schematic diagram  

Description  

The BU508AW is manufactured using diffused  

collector in planar technology adopting new and  

enhanced high voltage structure for updated  

performance to the horizontal deflection stage.  

Table 1.  

Order code  

BU508AW  

Device summary  

Marking  

Package  

TO-247  

Packaging  

BU508AW  

T

u

be  

August 2007  

Rev 2  

1/11  

11  

Content  

BU508AW  

Content  

2/11  

BU508AW  

Electrical ratings  

1

Electrical ratings  

Table 2.  

Symbol  

Absolute maximum rating  

Parameter  

Collector-emitter voltage (V

BE

= 0)  

Collector-emitter voltage (I

B

= 0)  

Collector-base voltage (I

C

= 0)  

Collector current  

Value  

Unit  

V

V

CES  

V

CEO  

V

EBO  

I

C  

1500  

700  

V

9

V

8

15  

A

I

CM  

Collector peak current (t

P

< 5ms)  

Base current  

A

I

B  

4

A

P

TOT  

T

stg  

T

J  

T

o

tal dissipation at T

c

= 25°C  

Storage temperature  

125  

W

-65 to 150  

150  

°C  

Max. operating junction temperature  

Table 3.  

Symbol  

Thermal data  

Parameter  

Value  

Unit  

R

thj-case  

Thermal resistance junction-case

 

_______________

max  

1

°C/W  

3/11  

Electrical characteristics  

BU508AW  

2

Electrical characteristics  

(T  

= 25°C unless otherwise specified)  

case  

Table 4.  

Symbol  

Electrical characteristics  

Parameter  

Test conditions  

Min. Typ. Max. Unit  

V

CE

= 1500V  

Collector cut-off current  

(V

BE

=0)  

0.2  

2

mA  

mA  

I

CES  

V

CE

= 1500V;

 

T

C

= 125°C  

Emitter cut-off current  

(I

C

=0)  

I

EBO  

V

EB

= 9V  

1

mA  

V

Collector-emitter  

sustaining voltage  

(1)  

I

C

= 100mA  

700  

V

CEO(sus)  

(I

C

=0)  

Collector-emitter  

saturation voltage  

(1)  

I

C

= 4.5A  

I

C

= 4.5A  

I

B

= 1.6A  

I

B

= 2A  

1

V

V

V

CE(sat)  

Base-emitter saturation  

voltage  

(1)  

1.1  

30  

V

BE(sat)  

I

C

= 0.1A  

I

C

= 4.5A  

V

CE

= 5V  

V

CE

= 5V  

10  

5

(1)  

DC current gain  

h

FE  

I

C

= 4.5A  

I

B(on)

= 0.5A  

Inductive load  

Storage time  

Fall time  

t

s  

t

f  

V

BE(off)

= -2.7V

 

f

h

= 16KHz  

2.5  

0.2  

µ

s  

µ

s  

L

BB(off)

= 4.5

µ

H  

1. Pulsed:

 

Pulse duration = 300 ms, duty cycle 1.5 %  

4/11  

BU508AW  

Electrical characteristics  

2.1  

Electrical characteristics (curves)  

Figure 2.  

Figure 4.  

Figure 6.  

Safe operating area  

Figure 3.  

Derating curve  

DC current gain  

Figure 5.  

DC current gain  

Collector-emitter saturation

 

Figure 7.  

voltage  

Base-emitter saturation  

voltage  

5/11  

Electrical characteristics  

Figure 8.  

BU508AW  

Output characteristics  

6/11  

BU508AW  

Electrical characteristics  

2.2  

Test circuits  

Figure 9.  

Power losses and inductive load switching  

Figure 10.

 

Reverse biased safe operating area  

7/11  

Package mechanical data  

BU508AW  

3

Package mechanical data  

In order to meet environmental requirements, ST offers these devices in ECO

P

A

CK®  

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. ECO

P

ACK is an ST trademark.  

ECO

P

ACK specifications are available at:

8/11  

BU508AW  

Package mechanical data  

TO-247 MECHANICAL DATA  

mm.  

inch  

DIM.  

MIN.  

4.85  

2.20  

1.0  

TYP  

MAX.  

5.15  

MIN.  

0.19  

TYP.  

MAX.  

0.20  

A

A1  

b

2.60  

0.086  

0.039  

0.079  

0.118  

0.015  

0.781  

0.608  

0.102  

0.055  

0.094  

0.134  

0.03  

1.40  

b1  

b2  

c

2.0  

2.40  

3.0  

3.40  

0.40  

19.85  

15.45  

0.80  

D

20.15  

15.75  

0.793  

0.620  

E

e

5.45  

18.50  

5.50  

0.214  

0.728  

0.216  

L

14.20  

3.70  

14.80  

4.30  

0.560  

0.14  

0.582  

0.17  

L1  

L2  

øP  

øR  

S

3.55  

4.50  

3.65  

5.50  

0.140  

0.177  

0.143  

0.216  

9/11  

Revision history  

BU508AW  

4

Revision history  

Table 5.  

Date  

Document revision history  

Revision  

Changes  

02-Mar-2007  

14-Aug-2007  

1

2

Initial release.  

Complete document, added all curves (

10/11  

BU508AW  

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