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.

Key Features

  • VBO : 32V and 40V


Technical Documentation

Product Specifications
Description Version Size
DS2125 DS2125: DIAC 2.1 59 KB
Application Notes
Description Version Size
AN4564 AN4564: Is a positive power supply mandatory for my application, or could a negative output work also? 1.0 384 KB
AN2703 AN2703: Parameter list for SCRs, TRIACs, AC switches, and DIACS 2.5 99 KB
Technical Notes & Articles
Description Version Size
TN1173 TN1173: Packing information for IPAD™, protection, rectifiers, thyristors and AC Switches 3.1 333 KB

HW Model & CAD Libraries

HW Model & CAD Libraries
Description Version Size
Diacs PSpice model (.lib) and symbols (.olb) 2.0 9 KB

Publications and Collaterals

Selection Guides
Description Version Size
Thyristors, Triacs, AC switches and A.S.D™ selection guide 2.0 1 MB

Sample & Buy

Part Number Package Packing Type Marketing Status Unit Price (US$) * Quantity Junction Temperature (°C) (max) ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
DB3 DO-35 Tape And Reel Active 0.051 100 125 NEC EAR99 CHINA MORE INFO Get Sample Add to cart DISTRIBUTOR AVAILABILITY

(*) 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

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
DB3 ActiveDO-35IndustrialEcopack2 0 0

(**) 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.