®
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.
DB3 DB4 SMDB3
DIAC
DO-35
(DB3 and DB4)
2
SOT-23
(SMDB3)*
Pin 1 and 3 must be shorted
together
3
1
ABSOLUTE MAXIMUM RATINGS (limiting values)
Symbol Parameter Value Unit
I
TRM
Repetitive peak on-state current
SMDB3
1.00 A
tp=20µs F= 120 Hz
Tstg
Tj
Note: *SMDB3indicated as Preliminary spec as product is still in development stage.
October 2001 - Ed: 2B
Storage temperature range
Operating junction temperature range
DB3 / DB4
2.00
-40to+125 °C
1/5
DB3 DB4 SMDB3
ELECTRICAL CHARACTERISTICS (Tj = 25°C unless otherwise specified)
Symbol Parameter Test Conditions SMDB3 DB3 DB4 Unit
V
BO
IV
BO1-VBO2
∆ V Dynamic breakover
V
O
I
BO
tr Risetime * seediagram 3 MAX. 0.50 2 µs
I
R
I
P
* Applicable to both forward and reverse directions.
** Connected in parallel to the device.
PRODUCT SELECTOR
Breakover voltage * C = 22nF ** MIN. 28 28 35 V
I Breakover voltage
symmetry
voltage *
Output voltage * see diagram 2
Breakover current * C = 22nF ** MAX. 10 50 µA
Leakage current * VR= 0.5 VBOmax MAX. 1 10 µA
Peak current * see diagram 2 (Gate) MIN. 1 0.30 A
TYP. 32 32 40
MAX. 36 36 45
C = 22nF ** MAX. 3 V
and VFat 10mA MIN. 10 5 V
V
BO
MIN. 10 5 V
(R=20Ω)
Part Number V
SMDB3
DB3
DB4
ORDERING INFORMATION
Surface
Mount
Version
BO
28 - 36 SOT-23
28 - 36 DO-35
35 - 45 DO-35
SM DB 3
Diac Series
Package
Breakover voltage
BO
3:V typ = 32V
BO
4:V typ = 40V
2/5
DB3 DB4 SMDB3
OTHER INFORMATION
Part Number Marking Weight Base Quantity Packing Mode
SMDB3 DB3
DB3 DB3 (Blue Body Coat)
DB4 DB4 (Blue Body Coat)
Diagram 1: Voltage - current characteristic curve.
+I
F
10mA
I
BO
-V +V
I
B
0,5 V
BO
V
V
F
V
BO
0.01 g 3000 Tape & Reel
0.15 g 5000 Tape & Reel
0.15 g 5000 Tape & Reel
Diagram 2: Test circuit.
D.U.T
Vo
Rs=0
R=20 Ω
I
P
220V
50 Hz
500 kΩ10 kΩ
C=0.1µF
Diagram 3: Rise time measurement.
l
p
90 %
T410
-I
F
10 %
t
r
3/5
DB3 DB4 SMDB3
Fig. 1: Relative variation of VBO versus junction
temperature (typical values).
VBO [Tj] /VBO [Tj=25°C]
1.10
1.05
DB3/DB4
1.00
0.95
SMDB3
0.90
0.85
Tj(°C)
0.80
25 50 75 100 125
Fig. 3: Time duration while current pulse is higher
50mA versus C and Rs (typical values).
tp(µs)
40
Tj=25°C
35
30
25
33Ω
20
15
10
5
0
10 20 50 100 200 500
0Ω
47Ω
10Ω
Ω
68
22Ω
C(nF)
Fig. 2: Repetitive peak pulse current versus pulse
duration (maximum values).
ITRM(A)
20.0
10.0
DB3/DB4
1.0
SMDB3
tp(µs)
0.1
1 10 100
F=120Hz
Tj initial=25°C
PACKAGE MECHANICAL DATA (in millimeters)
DO-35
4/5
CA
O
/
D
C
O
/
D
REF. DIMENSIONS
BO
/
Millimeters Inches
Min. Max. Min. Max.
A 3.05 4.50 0.120 0.177
B 1.53 2.00 0.060 0.079
C 28.00 1.102
D 0.458 0.558 0.018 0.022
PACKAGE MECHANICAL DATA (in millimeters)
SOT-23
DB3 DB4 SMDB3
B
FOOTPRINT
0.9
0.035
E
A
REF. DIMENSIONS
Millimeters Inches
Min. Max. Min. Max.
e
e1
D
A 0.89 1.4 0.035 0.055
A1 0 0.1 0 0.004
B 0.3 0.51 0.012 0.02
S
A1
c 0.085 0.18 0.003 0.007
D 2.75 3.04 0.108 0.12
L
e 0.85 1.05 0.033 0.041
e1 1.7 2.1 0.067 0.083
H
E 1.2 1.6 0.047 0.063
H 2.1 2.75 0.083 0.108
c
L 0.6 typ. 0.024 typ.
S 0.35 0.65 0.014 0.026
0.9
0.035
1.1
0.043
1.9
2.35
0.92
Informationfurnished is believedto be accurateandreliable. However, STMicroelectronicsassumes no responsibilityforthe consequences of
useof such informationnor for anyinfringement of patentsor other rightsof third partieswhichmay result fromits use. Nolicense is grantedby
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.
1.45
0.037
0.075
0.9
0.035
mm
inch
1.1
0.043
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