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® |
DB3 DB4 SMDB3 |
DIAC
FEATURES
■VBO : 32V and 40V
■LOW BREAKOVER CURRENT
DESCRIPTION
Functioning as a trigger diode with a fixed voltage reference, the DB3/DB4 series can be used in conjunction with triacs for simplified gate control circuits or as a starting element in fluorenscent lamp ballasts.
A new surface mount version is now available in SOT-23 package, providing reduced space and compatibility with automatic pick and place equipment.
ABSOLUTE MAXIMUM RATINGS (limiting values)
DO-35
(DB3 and DB4)
2
3
1
SOT-23 (SMDB3)*
Pin 1 and 3 must be shorted together
Symbol |
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Parameter |
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Value |
Unit |
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ITRM |
Repetitive peak on-state current |
SMDB3 |
1.00 |
A |
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tp = 20 μs |
F= 120 Hz |
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DB3 / DB4 |
2.00 |
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Tstg |
Storage temperature range |
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- 40 to + 125 |
°C |
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Tj |
Operating junction temperature range |
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Note: * SMDB3 indicated as Preliminary spec as product is still in development stage.
October 2001 - Ed: 2B |
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DB3 DB4 SMDB3
ELECTRICAL CHARACTERISTICS (Tj = 25°C unless otherwise specified)
Symbol |
Parameter |
Test Conditions |
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SMDB3 |
DB3 |
DB4 |
Unit |
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VBO |
Breakover voltage * |
C = 22nF ** |
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MIN. |
28 |
28 |
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35 |
V |
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TYP. |
32 |
32 |
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40 |
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MAX. |
36 |
36 |
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45 |
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I VBO1 - VBO2 I |
Breakover voltage |
C = 22nF ** |
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MAX. |
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3 |
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V |
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symmetry |
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V |
Dynamic breakover |
VBO and VF at 10mA |
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MIN. |
10 |
5 |
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V |
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voltage * |
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VO |
Output voltage * |
see diagram 2 |
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MIN. |
10 |
5 |
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V |
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(R=20Ω) |
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IBO |
Breakover current * |
C = 22nF ** |
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MAX. |
10 |
50 |
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μA |
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tr |
Rise time * |
see diagram 3 |
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MAX. |
0.50 |
2 |
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μs |
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IR |
Leakage current * |
VR = 0.5 VBO max |
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MAX. |
1 |
10 |
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μA |
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IP |
Peak current * |
see diagram 2 (Gate) |
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MIN. |
1 |
0.30 |
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A |
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*Applicable to both forward and reverse directions.
**Connected in parallel to the device.
PRODUCT SELECTOR
Part Number |
VBO |
Package |
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SMDB3 |
28 - 36 |
SOT-23 |
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DB3 |
28 - 36 |
DO-35 |
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DB4 |
35 - 45 |
DO-35 |
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ORDERING INFORMATION
SM DB 3
Surface
Mount 
Version
Diac Series
Breakover voltage
3:VBO typ = 32V
4:VBO typ = 40V
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DB3 DB4 SMDB3 |
OTHER INFORMATION |
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Part Number |
Marking |
Weight |
Base Quantity |
Packing Mode |
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SMDB3 |
DB3 |
0.01 g |
3000 |
Tape & Reel |
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DB3 |
DB3 (Blue Body Coat) |
0.15 g |
5000 |
Tape & Reel |
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DB4 |
DB4 (Blue Body Coat) |
0.15 g |
5000 |
Tape & Reel |
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Diagram 1: Voltage - current characteristic curve.
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+ |
IF |
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10mA |
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IBO |
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- V |
IB |
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+ V |
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0,5 VBO |
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V |
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VF |
VBO |
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- IF |
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Diagram 2: Test circuit.
10 kΩ |
500 kΩ |
D.U.T |
Rs=0 |
220 V |
C=0.1µF |
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I P |
50 Hz |
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Vo |
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T410 |
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R=20 Ω |
Diagram 3: Rise time measurement.
lp |
90 % |
10 % |
tr |
3/5
DB3 DB4 SMDB3
Fig. 1: Relative variation of VBO versus junction temperature (typical values).
Fig. 2: Repetitive peak pulse current versus pulse duration (maximum values).
VBO [Tj] / VBO [Tj=25°C] |
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1.10 |
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20.0 |
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1.05 |
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DB3/DB4 |
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10.0 |
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1.00 |
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0.95 |
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SMDB3 |
1.0 |
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0.90 |
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0.85 |
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Tj(°C) |
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0.80 |
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0.1 |
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50 |
75 |
100 |
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25 |
125 |
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ITRM(A) |
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F=120Hz |
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Tj initial=25°C |
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DB3/DB4 |
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SMDB3 |
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tp(µs) |
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1 |
10 |
100 |
Fig. 3: Time duration while current pulse is higher 50mA versus C and Rs (typical values).
tp(µs) |
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40 |
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Tj=25°C |
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68Ω |
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35 |
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30 |
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47Ω |
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25 |
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33Ω |
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20 |
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15 |
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10 |
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22Ω |
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5 |
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10Ω |
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0Ω |
C(nF) |
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0 |
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20 |
50 |
100 |
200 |
500 |
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10 |
PACKAGE MECHANICAL DATA (in millimeters)
DO-35
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REF. |
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DIMENSIONS |
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C |
A |
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C |
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O/ B |
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Millimeters |
Inches |
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Min. |
Max. |
Min. |
Max. |
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A |
3.05 |
4.50 |
0.120 |
0.177 |
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B |
1.53 |
2.00 |
0.060 |
0.079 |
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O/ D |
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O/ D |
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C |
28.00 |
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1.102 |
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D |
0.458 |
0.558 |
0.018 |
0.022 |
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4/5
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DB3 DB4 SMDB3 |
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PACKAGE MECHANICAL DATA (in millimeters) |
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SOT-23 |
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E |
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A |
REF. |
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DIMENSIONS |
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Millimeters |
Inches |
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Min. |
Max. |
Min. |
Max. |
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e |
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A |
0.89 |
1.4 |
0.035 |
0.055 |
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e1 |
D |
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B |
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A1 |
0 |
0.1 |
0 |
0.004 |
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B |
0.3 |
0.51 |
0.012 |
0.02 |
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S |
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c |
0.085 |
0.18 |
0.003 |
0.007 |
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A1 |
D |
2.75 |
3.04 |
0.108 |
0.12 |
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L |
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e |
0.85 |
1.05 |
0.033 |
0.041 |
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e1 |
1.7 |
2.1 |
0.067 |
0.083 |
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H |
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E |
1.2 |
1.6 |
0.047 |
0.063 |
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H |
2.1 |
2.75 |
0.083 |
0.108 |
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c |
L |
0.6 typ. |
0.024 typ. |
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S |
0.35 |
0.65 |
0.014 |
0.026 |
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FOOTPRINT |
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0.9 |
0.9 |
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0.035 |
0.035 |
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1.1 |
0.043 |
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1.9 |
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2.35 |
0.92 |
0.075 |
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1.45 |
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mm |
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inch |
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0.037 |
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1.1 |
0.043 |
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0.9 |
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0.035 |
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Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
© 2001 STMicroelectronics - Printed in Italy - All rights reserved.
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