STMicroelectronics SMDB3 DIAC 36V, 1A, 3-Pin SOT-23

Technical data sheets
Legislation and Compliance
RoHS Certificate of Compliance
COO (Country of Origin): MY
Product Details

DB3, DB4, SMDB3 DIAC Diodes

ST Microelectronics 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.

Features and Benefits

  • VBO: 32 V and 40 V

  • Low breakover current

  • Breakover voltage symmetry: 3V

  • ECOPACK®2 compliant


  • Triggering device for Triac or SCR based motor/ light dimmer

  • 32 V trigger device for oscillator circuit

  • Start-up triggering in lighting ballast for CFL, TL or LED lamps

The DIAC, or 'diode for alternating current', is a diode that conducts current only after its breakover voltage has been reached momentarily.

Attribute Value
Maximum Breakover Current 0.01mA
Maximum Breakover Voltage 36V
Repetitive Peak On-State Current 1A
Repetitive Peak Off-State Current 0.01mA
Mounting Type Surface Mount
Package Type SOT-23
Pin Count 3
Dimensions 2.9 x 1.3 x 0.95mm
Length 2.9mm
Width 1.3mm
Height 0.95mm
Minimum Operating Temperature -40 °C
Maximum Operating Temperature +125 °C
Temporarily out of stock - back order for despatch 16/06/2020, delivery within 3 working days from despatch date
Price Each (On a Reel of 3000)
SGD 0.288
(exc. GST)
SGD 0.308
(inc. GST)
Per unit
Per Reel*
3000 +
*price indicative
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