DB3, DB4, SMDB3 Datasheet by STMicroelectronics

DO-35
SOT-23
Pin 1 and 3 must be shorted
together
3
1
2
Features
• VBO : 32 V and 40 V
Low breakover current
Breakover voltage symmetry : 3V
• ECOPACK®2 compliant
Applications
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
Diac
DB3, DB4, SMDB3
Datasheet
DS2125 - Rev 3 - December 2018
For further information contact your local STMicroelectronics sales office.
www.st.com
1Characteristics
Table 1. Absolute maximum ratings (limiting values), Tj = 25 °C unless otherwise specified
Symbol Parameter Value Unit
ITRM Repetitive peak on-state current, tp = 20 µs, F = 120 Hz SMDB3 1.00 A
DB3 / DB4 2.00 A
Tstg Storage junction temperature range -40 to +125 °C
TjOperating junction temperature range -40 to +125 °C
Table 2. Electrical characteristics (Tj = 25 °C unless otherwise specified)
Symbol Parameter Test conditions SMDB3 DB3 DB4 Unit
VBO Breakover voltage (1) C = 10 nF (2)
Min. 28 28 35
VTyp. 32 32 40
Max. 36 36 45
I VBO1 - VBO2 I Breakover voltage symmetry C = 10 nF(2) Max. 3 3 3 V
Δ V Dynamic breakover voltage (1) VBO and VF at 10 mA Min. 10 5 5 V
VOOutput voltage (1) See Figure 2. Test circuit, (R = 20 Ω) Min. 10 5 5 V
IBO Breakover current (1) C = 10 nF (2) Max. 10 50 50 µA
trRise time (1) See Figure 3. Rise time measurement Max. 0.5 2 2 µs
IRLeakage current (1) VR = 0.5 x VBO max Max. 1 10 10 µA
IPPeak 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
DB3, DB4, SMDB3
Characteristics
DS2125 - Rev 3 page 2/11
Figure 1. Voltage - current characteristic curve.
10 mA
IBO
IBV+V-
+IF
- IF
0,5 VBO
VBO
ΔV
VF
Figure 2. Test circuit
D.U.T
Vo
IP
T410
C = 0.1 µF
220 V
50 Hz
500 kΩ10 kΩ
R = 20 Ω
Rs = 0
DB3, DB4, SMDB3
Characteristics
DS2125 - Rev 3 page 3/11
Figure 3. Rise time measurement
90 %
l
p
10 %
tr
DB3, DB4, SMDB3
Characteristics
DS2125 - Rev 3 page 4/11
1.1 Characteristics curves
Figure 4. Relative variation of VBO versus junction
temperature (typical values)
VBO[Tj] / VBO[Tj=25 °C]
0.80
0.85
0.90
0.95
1.00
1.05
-40 -20 0 20 40 60 80 100 120
(°C)Tj
DB3 / DB4
SMDB3
Figure 5. On-state RMS current versus Triac gate current
pulse duration tp
0.1
1.0
10.0
ITRM(A)
110 100
tp(µs)
DB3 / DB4
SMDB3
f = 120 Hz
Tj initial = 25°C
Figure 6. Triac gate current pulse duration tp (to have IP > 50 mA) versus Rs and C values (typical values)
tP(s)
00E+0
10E-6
20E-6
30E-6
40E-6
50E-6
10E-9 100E-9 1E-6
0
68
33
47
22
10
C(F)
Note: according to Figure 2. Test circuit
DB3, DB4, SMDB3
Characteristics (curves)
DS2125 - Rev 3 page 5/11
,[ L \Jv
2Package 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
L
L1
Gauge plane
Seating plane
0.25
a
D
A
A1
B
3
1 2
Se
e1
H
L
c
E
DB3, DB4, SMDB3
Package information
DS2125 - Rev 3 page 6/11
;\‘4}+
Table 3. SOT23-3L package mechanical data
Ref.
Dimensions
Millimeters Inches (for reference only)
Min. 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°
Figure 8. SOT23-3L footprint in mm
1.05
0.79
0.48
0.97
2.89
2.42
0.395
0.73
DB3, DB4, SMDB3
SOT23-3L package information
DS2125 - Rev 3 page 7/11
2.2 DO-35 package information
Figure 9. DO-35 package outline
ØB
ØD
ACC
Table 4. DO-35 package mechanical data
Ref.
Dimensions
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
DB3, DB4, SMDB3
DO-35 package information
DS2125 - Rev 3 page 8/11
:J V 2 3 NFL: V 3:
3Ordering information
Figure 10. Ordering information scheme
Table 5. Ordering information
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)
DO-35
0.15 g 5000 Tape and reel
DB4 DB4 (Blue Body Coat) 0.15 g 5000 Tape and reel
DB3, DB4, SMDB3
Ordering information
DS2125 - Rev 3 page 9/11
Revision history
Table 6. Document revision history
Date Version Changes
18-Jun-2018 2 First release.
14-Dec-2018 3 Minor text change to improve readability.
DB3, DB4, SMDB3
DS2125 - Rev 3 page 10/11
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DB3, DB4, SMDB3
DS2125 - Rev 3 page 11/11