DCCOM DB4, DB3 Datasheet

DC COMPONENTS CO., LTD.

NEXT

BACK

EXIT

EXIT

R

RECTIFIER SPECIALISTS

DB3

THRU

DB4

TECHNICAL SPECIFICATION

S OF

BIDIRECTIONAL DIODE THYRISTORS (DIACS)

FEATURES

* 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.

MECHANICAL DATA

* Case: Glass sealed case
* Lead: MIL-STD-202E, Method 208 guaranteed

* Mounting position: Any
* Weight: 0.15 gram

MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS

Ratings at 25oC ambient temperature unless otherwise specified.
Single phase, half wave, 60 Hz, resistive or inductive load.
For capacitive load, derate current by 20%.

0.52Ø

25.0MIN

4.2MAX

25.0MIN

Dimensions in millimeters

2.0MAX

DO-35

PARAMETERS SYMBOL DB3 DB4 UNITS

VOLT

28 35 Min

Breakover Voltage +VBO, -VBO 32 40 Typ

36 45 Max

VOLT

Breakover Voltage Symmetry (+VBO)-(-VBO) 3 3 Max

VOLT

Dynamic Breakback Voltage VBO - VBR 5 5 Min

uA
Breakover Current +IBO, -IBO 100 100 Max
Peak Pulse Current for AMP
10uS, 120pps, TA<=40

o

C IP 2.0 2.0 Max

156

RATING AND CHARACTERISTIC CURVES ( DB3 THRU DB4 )

BACK

EXIT

EXIT

FIG.1-V-I CHARACTERISTICS CURRENT

BREAKOVER
VOLTAGE

+5mA

-VBo -VBR

+8

+6

+4

+2

+IBo

+VBR

-IBo

-5mA

FIG.3-NORMALIZED VBO CHANGE

VS JUNCTION TEMPERATURE

D28 32 35 40 50

+VBo

VOLTAGE

D60

FIG.2-REPETITIVE PEAK ON-STATE
CURRENT VS PULSE DURATION

2.0

1.0

0.7

0.5

0.3

0.2

0.1
.07
.05
.03
.02
.01
.007
.005
.003
.002
.001

10 100 1000 10,000

PULSE REPEAT ON RATE =120 PPS

Tz=400C

D60

SAFE OPERATING

AREA

FIG.4-TEST CIRCUIT WAVE FORMS

(SEE FIG.5)

+V(BO)

0

-V(BO)

D28 32 35 40&50

aV+

aV-

t

0

-2

-4

-6

-8

-40 -20 0 +20 +40 +60 +80 +100 +120 +140

DC COMPONENTS CO., LTD.

R

157

+IP

0

-IP

FIG.5-CIRCUIT USED TO MEASURE

DIAC CHARACTERISTICS

RF

Vc

120V

RMS

60Hz

*ADJUST FOR ONE FIRING IN HALF CYCLE

D.U.T.

0.1u f

t

200Ω
1%