DB3, DB4, SMDB3
Datasheet
Diac
Features
DO-35
2
•
VBO : 32 V and 40 V
•
•
Low breakover current
Breakover voltage symmetry : 3V
•
ECOPACK®2 compliant
Applications
3
1
SOT-23
Pin 1 and 3 must be shorted
together
•
•
•
Triggering device for Triac or SCR based motor / light dimmer
32 V trigger device for oscillator circuit
Start up triggering in lighting ballast for CFL, TL or LED lamps
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 fluorescent lamp ballasts.
The surface mount SOT23-3L package allows compact, SMD based designs for
automated manufacturing.
Product status link
DB3
DB4
SMDB3
Product summary
Part number
VBO
SMDB3
28 - 36 V
DB3
28 - 36 V
DB4
35 - 45 V
DS2125 - Rev 3 - December 2018
For further information contact your local STMicroelectronics sales office.
www.st.com
DB3, DB4, SMDB3
Characteristics
1
Characteristics
Table 1. Absolute maximum ratings (limiting values), Tj = 25 °C unless otherwise specified
Symbol
Parameter
Value
Unit
SMDB3
1.00
A
DB3 / DB4
2.00
A
ITRM
Repetitive peak on-state current, tp = 20 µs, F = 120 Hz
Tstg
Storage junction temperature range
-40 to +125
°C
Operating junction temperature range
-40 to +125
°C
Tj
Table 2. Electrical characteristics (Tj = 25 °C unless otherwise specified)
Symbol
VBO
Parameter
Test conditions
Breakover voltage (1)
I VBO1 - VBO2 I Breakover voltage symmetry
SMDB3 DB3 DB4 Unit
Min.
28
28
35
Typ.
32
32
40
Max.
36
36
45
C = 10 nF(2)
Max.
3
3
3
V
C = 10 nF (2)
V
ΔV
Dynamic breakover voltage (1)
VBO and VF at 10 mA
Min.
10
5
5
V
VO
Output voltage (1)
See Figure 2. Test circuit, (R = 20 Ω)
Min.
10
5
5
V
Max.
10
50
50
µA
IBO
Breakover current
(1)
C = 10 nF
(2)
tr
Rise time (1)
See Figure 3. Rise time measurement
Max.
0.5
2
2
µs
IR
Leakage current (1)
VR = 0.5 x VBO max
Max.
1
10
10
µA
IP
Peak current (1)
See Figure 2. Test circuit
Min.
1
0.30 0.30
A
1. Applicable to both forward and reverse directions.
2. Connected in parallel to the device
DS2125 - Rev 3
page 2/11
DB3, DB4, SMDB3
Characteristics
Figure 1. Voltage - current characteristic curve.
+IF
10 mA
IBO
IB
-V
0,5 V BO
ΔV
VF
+V
VBO
- IF
Figure 2. Test circuit
10 kΩ
220 V
50 Hz
500 kΩ
D.U.T
Rs = 0
C = 0.1 µF
IP
Vo
T410
R = 20 Ω
DS2125 - Rev 3
page 3/11
DB3, DB4, SMDB3
Characteristics
Figure 3. Rise time measurement
lp
90 %
10 %
tr
DS2125 - Rev 3
page 4/11
DB3, DB4, SMDB3
Characteristics (curves)
1.1
Characteristics curves
Figure 4. Relative variation of VBO versus junction
temperature (typical values)
Figure 5. On-state RMS current versus Triac gate current
pulse duration tp
VBO [T j ] / V BO [T j =25 °C]
ITRM(A)
1.05
10.0
DB3 / DB4
1.00
f = 120 Hz
Tj initial = 25°C
DB3 / DB4
0.95
1.0
SMDB3
0.90
SMDB3
0.85
Tj (°C)
0.80
-40
-20
0
20
40
60
80
100
120
tp(µs)
0.1
1
10
100
Figure 6. Triac gate current pulse duration tp (to have IP > 50 mA) versus Rs and C values (typical values)
tP(s)
50E-6
68 Ω
40E-6
47 Ω
30E-6
33 Ω
20E-6
22 Ω
10E-6
0Ω
00E+0
10E-9
Note:
DS2125 - Rev 3
100E-9
10 Ω
C(F)
1E-6
according to Figure 2. Test circuit
page 5/11
DB3, DB4, SMDB3
Package information
2
Package information
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.
2.1
SOT23 package information
Figure 7. SOT23-3L package outline
B
L
3
E
H
1
2
e
S
c
e1
D
0.25
Gauge plane
A
a
Seating plane
L1
A1
DS2125 - Rev 3
L
page 6/11
DB3, DB4, SMDB3
SOT23-3L package information
Table 3. SOT23-3L package mechanical data
Dimensions
Ref.
Millimeters
Min.
Inches (for reference only)
Typ.
Max.
Min.
Typ.
Max.
A
0.89
1.40
0.0350
0.0551
A1
0.00
0.10
0.0000
0.0039
B
0.30
0.51
0.0118
0.0201
C
0.085
0.18
0.0033
0.0071
D
2.75
3.04
0.1083
0.1197
e
0.85
1.05
0.0335
0.0413
e1
1.70
2.10
0.0669
0.0827
E
1.20
1.75
0.0472
0.0689
H
2.10
3.00
0.0827
0.1181
L
0.60
0.0236
S
0.35
0.65
0.0138
0.256
L1
0.25
0.55
0.0098
0.0217
a
0°
8°
0°
8°
Figure 8. SOT23-3L footprint in mm
2.42
0.97
0.73
2.89
0.79
0.395
1.05
0.48
DS2125 - Rev 3
page 7/11
DB3, DB4, SMDB3
DO-35 package information
2.2
DO-35 package information
Figure 9. DO-35 package outline
C
C
A
ØD
ØB
Table 4. DO-35 package mechanical data
Dimensions
Ref.
DS2125 - Rev 3
Millimeters
Inches (for reference only)
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
31.00
1.102
1.220
D
0.46
0.55
0.018
0.022
page 8/11
DB3, DB4, SMDB3
Ordering information
3
Ordering information
Figure 10. Ordering information scheme
SM DB
3
Surface mount version
Diac series
Breakover voltage
3 = VBO typ. = 32 V
4 = VBO typ. = 40 V
Table 5. Ordering information
DS2125 - Rev 3
Order code
Marking
Package
Weight
Base qty.
Delivery mode
SMDB3
DB3
SOT-23
0.01 g
3000
Tape and reel
DB3
DB3 (Blue Body Coat)
0.15 g
5000
Tape and reel
DB4
DB4 (Blue Body Coat)
0.15 g
5000
Tape and reel
DO-35
page 9/11
DB3, DB4, SMDB3
Revision history
Table 6. Document revision history
DS2125 - Rev 3
Date
Version
Changes
18-Jun-2018
2
First release.
14-Dec-2018
3
Minor text change to improve readability.
page 10/11
DB3, DB4, SMDB3
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© 2018 STMicroelectronics – All rights reserved
DS2125 - Rev 3
page 11/11
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