Whether you are an EE student debugging a lamp dimmer, or a production manager qualifying an alternate source for DIACs, the DB2 remains a top choice. Bookmark this guide and keep the table handy—you will consult it again.
According to standard manufacturer data, the DB2 generally falls within the following parameters (values may vary slightly by manufacturer, such as or Littelfuse ): Typical Value Breakover Voltage VBOcap V sub cap B cap O end-sub 28 – 36 (Typ. 32) Breakover Current IBOcap I sub cap B cap O end-sub < 15 – 50 Repetitive Peak Current ITRMcap I sub cap T cap R cap M end-sub Power Dissipation ( ) Ptotcap P sub t o t end-sub Operating Junction Temp Tjcap T sub j -40 to +125 ∘raised to the composed with power Breakover Symmetry ≤3is less than or equal to 3 Sources: 3. Electrical Characteristics & Curve Datasheet - DB3, DB4, SMDB3 - Diac - STMicroelectronics
Before diving into the datasheet specifics, let’s establish a baseline. A DIAC is a bidirectional trigger diode. Unlike a standard diode, it conducts current only after its (VBO) is exceeded in either direction. Once triggered, it exhibits negative resistance, dropping the voltage across it and allowing a surge of current to fire a TRIAC gate.
Whether you are an EE student debugging a lamp dimmer, or a production manager qualifying an alternate source for DIACs, the DB2 remains a top choice. Bookmark this guide and keep the table handy—you will consult it again.
According to standard manufacturer data, the DB2 generally falls within the following parameters (values may vary slightly by manufacturer, such as or Littelfuse ): Typical Value Breakover Voltage VBOcap V sub cap B cap O end-sub 28 – 36 (Typ. 32) Breakover Current IBOcap I sub cap B cap O end-sub < 15 – 50 Repetitive Peak Current ITRMcap I sub cap T cap R cap M end-sub Power Dissipation ( ) Ptotcap P sub t o t end-sub Operating Junction Temp Tjcap T sub j -40 to +125 ∘raised to the composed with power Breakover Symmetry ≤3is less than or equal to 3 Sources: 3. Electrical Characteristics & Curve Datasheet - DB3, DB4, SMDB3 - Diac - STMicroelectronics
Before diving into the datasheet specifics, let’s establish a baseline. A DIAC is a bidirectional trigger diode. Unlike a standard diode, it conducts current only after its (VBO) is exceeded in either direction. Once triggered, it exhibits negative resistance, dropping the voltage across it and allowing a surge of current to fire a TRIAC gate.
