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  • 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.

    Key Features

    • VBO : 32 V and 40 V
    • Low breakover current
    • Breakover voltage symmetry : 3V
    • ECOPACK®2 compliant

Recommended for you

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS2125
      Diac
      3.0
      214.37 KB
      PDF
      DS2125

      Diac

    • Description Version Size Action
      AN4993
      How to implement a SCR or a Triac in a hybride relay application
      1.1
      991.71 KB
      PDF
      AN4564
      Is a positive power supply mandatory for my application, or could a negative output work also?
      1.0
      384.04 KB
      PDF
      AN2703
      Parameter list for SCRs, TRIACs, AC switches, and DIACS
      2.6
      98.99 KB
      PDF
      AN4993

      How to implement a SCR or a Triac in a hybride relay application

      AN4564

      Is a positive power supply mandatory for my application, or could a negative output work also?

      AN2703

      Parameter list for SCRs, TRIACs, AC switches, and DIACS

    • Description Version Size Action
      TN1173
      Packing information for IPAD, protection, rectifiers, thyristors and AC Switches
      8.0
      417.06 KB
      PDF
      TN1173

      Packing information for IPAD, protection, rectifiers, thyristors and AC Switches

HW Model, CAD Libraries & SVD

    • Description Version Size Action
      Diacs PSpice model (.lib) and symbols (.olb) 5.0
      10.07 KB
      ZIP

      Diacs PSpice model (.lib) and symbols (.olb)

Publications and Collaterals

    • Description Version Size Action
      ST Thyristor Finder: SCRs and Triacs on Android and iOS 1.0
      854.07 KB
      PDF

      ST Thyristor Finder: SCRs and Triacs on Android and iOS

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
DB4
Active
DO-35 Industrial Ecopack2

DB4

Package:

DO-35

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DO-35

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

Sample & Buy

Part Number
Order from Distributors
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Budgetary Price (US$)*/Qty
More info
min
max
DB4 Available at 6 distributors

Distributor availability ofDB4

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 10535 1 Order Now
COMPEL EUROPE 47 1 Order Now
RS COMPONENTS EUROPE 5375 25 Order Now
ARROW EUROPE 55000 0 Order Now
MOUSER WORLDWIDE 15458 1 Order Now
Farnell Element14 EUROPE 5127 1 Order Now

Distributor reported inventory date: 2020-09-20

Distributor Name

DIGIKEY

Stock

10535

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

47

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

5375

Min.Order

25

Region

EUROPE Order Now

ARROW

Stock

55000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

15458

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5127

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-09-20

Sample & Buy Buy now
Active
EAR99 NEC Tape And Reel DO-35 - -
MORE INFO

Junction Temperature (°C) (max):

125

Country of Origin:

CHINA

DB4

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

Distributor availability ofDB4

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 10535 1 Order Now
COMPEL EUROPE 47 1 Order Now
RS COMPONENTS EUROPE 5375 25 Order Now
ARROW EUROPE 55000 0 Order Now
MOUSER WORLDWIDE 15458 1 Order Now
Farnell Element14 EUROPE 5127 1 Order Now

Distributor reported inventory date: 2020-09-20

Distributor Name

DIGIKEY

Stock

10535

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

47

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

5375

Min.Order

25

Region

EUROPE Order Now

ARROW

Stock

55000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

15458

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5127

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-09-20

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

DO-35

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

Junction Temperature (°C) (max)

125

Country of Origin

CHINA

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors