DB-3, DB-4

SILICON BIDIRECTIONAL DIACS

The glass passivated, three-layer, two terminal, axial lead,

hermetically sealed diacs are designed specifically for

triggering thyristors. They demonstrate low breakover current

at breakover voltage as they withstand peak pulse current.

The breakover symmetry is within four volts with a typical

breakover voltage of DB-3 32 V, DB-4 40 V. These diacs are

intended for use in thyristor phase control, circuits for

lamp-dimming, universal-motor speed controls, and heat

controls.

1)

Parameter

Symbol

Min.

Max.

Unit

DB-3

28

36

Breakover Voltage

DB-4

35

45

V

Breakover Currents

-

200

µA

Breakover Voltage Symmetry

-

3.8

V

Dynamic Breakover Voltage

|

ΔV ± |

5

-

V

Thermal Impedance Junction to Ambient Air

-

60

O

C/W

Max. 3.9

Max. 1.9

Glass Case DO-35

Max. 0.5

Min. 27.5

Min. 27.5

XXX

Cathode Band

Part No.

Dimensions in mm

Black

Black

Black

60~

120 V

ep

DIAC

CIRCUIT FOR PEAK OUTPUT VOLTAGE TEST

20

1)

3.3 K

120 VAC

60 Hz

load up to 1500 W

200 K

0.1 uF

100 V

TRIAC

BILATERAL

TRIGGER

DIAC

TYPICAL DIAC-TRIAC FULL-WAVE PHASE

CONTROL CIRCUIT