SMDB3

1/5
DB3 DB4 SMDB3
®
October 2001 - Ed: 2B
DIAC
DO-35
(DB3 and DB4)
V
BO
: 32V and 40V
LOW BREAKOVER CURRENT
FEATURES
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.
DESCRIPTION
Symbol Parameter Value Unit
I
TRM
Repetitive peak on-state current
tp=20µs F= 120 Hz
SMDB3
1.00 A
DB3 / DB4
2.00
Tstg
Tj
Storage temperature range
Operating junction temperature range
-40to+125 °C
ABSOLUTE MAXIMUM RATINGS (limiting values)
1
2
3
SOT-23
(SMDB3)*
Pin 1 and 3 must be shorted
together
Note: * SMDB3 indicated as Preliminary spec as product is still in development stage.
DB3 DB4 SMDB3
2/5
Symbol Parameter Test Conditions SMDB3 DB3 DB4 Unit
V
BO
Breakover voltage * C = 22nF ** MIN. 28 28 35 V
TYP. 32 32 40
MAX. 36 36 45
IV
BO1
-V
BO2
I Breakover voltage
symmetry
C = 22nF ** MAX. 3 V
V Dynamic breakover
voltage *
V
BO
and V
F
at 10mA MIN. 10 5 V
V
O
Output voltage * see diagram 2
(R=20)
MIN. 10 5 V
I
BO
Breakover current * C = 22nF ** MAX. 10 50 µA
tr Rise time * see diagram 3 MAX. 0.50 2 µs
I
R
Leakage current * V
R
= 0.5 V
BO
max MAX. 1 10 µA
I
P
Peak current * see diagram 2 (Gate) MIN. 1 0.30 A
* Applicable to both forward and reverse directions.
** Connected in parallel to the device.
ELECTRICAL CHARACTERISTICS (Tj = 25°C unless otherwise specified)
Part Number V
BO
Package
SMDB3
28 - 36 SOT-23
DB3
28 - 36 DO-35
DB4
35 - 45 DO-35
PRODUCT SELECTOR
SM DB 3
Surface
Mount
Version
Diac Series
Breakover voltage
3: V typ = 32V
4: V typ = 40V
BO
BO
ORDERING INFORMATION
DB3 DB4 SMDB3
3/5
10mA
I
BO
I
B
-V + V
+I
F
-I
F
0,5 V
BO
V
BO
V
V
F
Diagram 1: Voltage - current characteristic curve.
D.U.T
Vo
C=0.1µF
220 V
50 Hz
500 k10 k
R=20
I
P
Rs=0
T410
Diagram 2: Test circuit.
90 %
l
p
10 %
t
r
Diagram 3: Rise time measurement.
Part Number Marking Weight Base Quantity Packing Mode
SMDB3 DB3
0.01 g 3000 Tape & Reel
DB3 DB3 (Blue Body Coat)
0.15 g 5000 Tape & Reel
DB4 DB4 (Blue Body Coat)
0.15 g 5000 Tape & Reel
OTHER INFORMATION

SMDB3

Mfr. #:
Manufacturer:
STMicroelectronics
Description:
Diacs 32 Volt Trigger
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

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