PARAMETERS
SYMBOL
D B 3
D B 4
UNITS
VOLT
2 8
3 5
Min
Breakover Voltage
+VBO, -VBO
3 2
4 0
Typ
3 6
4 5
Max
VOLT
Breakover Voltage Symmetry
(+VBO)-(-VBO)
3
3
Max
VOLT
Dynamic Breakback Voltage
VBO - VBR
5
5
Min
uA
Breakover Current
+IBO, -IBO
1 0 0
1 0 0
Max
Peak Pulse Current for
AMP
10uS, 120pps, TA<=40
o
C I P 2 . 0 2 . 0 M a x
TECHNICAL SPECIFICATIONS OF BIDIRECTIONAL DIODE THYRISTORS (DIACS)
FEATURES
MECHANICAL DATA
* Case: Glass sealed case
* Mounting position: Any
* Weight: 0.15 gram
MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS
Ratings at 25
o
C ambient temperature unless otherwise specified.
Single phase, half wave, 60 Hz, resistive or inductive load.
For capacitive load, derate current by 20%.
DB3
THRU
DB4
DO-35
Dimensions in millimeters
RECTIFIER SPECIALISTS
R
DC COMPONENTS CO., LTD.
* Lead: MIL-STD-202E, Method 208 guaranteed
* Glass passivalted three-layer for triggering thyristors.
* Low breakover current at breakover voltage.
* For use in thyristor phase-control circuit for lampdimming,
universal-motor speed control and heat controls.
0.52
2.0MAX
25.0MIN
4.2MAX
25.0MIN
156
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DC COMPONENTS CO., LTD.
RATING AND CHARACTERISTIC CURVES ( DB3 THRU DB4 )
200
1%
FIG.1-V-I CHARACTERISTICS CURRENT
BREAKOVER
VOLTAGE
VOLTAGE
+VBo
+VBR
-IBo
-5mA
+5mA
+IBo
-VBo
-VBR
FIG.2-REPETITIVE PEAK ON-STATE
CURRENT VS PULSE DURATION
PULSE REPEAT ON RATE =120 PPS
Tz=40
0
C
D60
2.0
1.0
0.7
0.5
0.3
0.2
0.1
.07
.05
.03
.02
.01
.007
.005
.003
.002
.001
D28 32 35 40&50
SAFE OPERATING
AREA
10
100
1000
10,000
FIG.5-CIRCUIT USED TO MEASURE
DIAC CHARACTERISTICS
RF
D.U.T.
0.1u f
Vc
120V
RMS
60Hz
*ADJUST FOR ONE FIRING IN HALF CYCLE
FIG.4-TEST CIRCUIT WAVE FORMS
(SEE FIG.5)
aV+
aV-
+V(BO)
-V(BO)
0
t
0
+IP
-IP
t
FIG.3-NORMALIZED VBO CHANGE
VS JUNCTION TEMPERATURE
+8
+6
+4
+2
0
-2
-4
-6
-8
-40
-20
0
+20
+40
+60
+80 +100 +120 +140
D28 32 35 40 50
D60
157
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