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DB3

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STMicroelectronics Diacs Trigger Diode, DO-35. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.

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DB3

STMicroelectronics · Diacs Trigger Diode · DO-35

DB3 from STMicroelectronics, in a DO-35. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 K passive Cathode: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint.
2 A passive Anode.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package DO-35
Category Diodes
Pins 2

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Breakover voltage VBO 28 32 36 V C = 22nF, connected in parallel with the device; see diagram 1 2
Breakover current IBO 100 µA C = 22nF 2
Leakage current IB 10 µA VB = 0.5 VBO max; see diagram 1 2
Breakover voltage symmetry [I+VBOI-I-VBOI] -3 3 V C = 22nF; printed as ± 3V 2
Dynamic breakover voltage I∆V 5 V ∆I = [IBO to IF=10mA]; see diagram 1 2
Output voltage VO 5 V see diagram 2 2
Rise time tr 1.5 µs see diagram 3 2
Repetitive peak on-state current ITRM 2 A tp = 20 µs, F = 100 Hz 1
Power dissipation on printed circuit P 150 mW L = 10 mm, Ta = 65 °C 1
Storage temperature range Tstg -40 125 °C 1
Junction temperature range Tj -40 125 °C 1
Junction to ambient thermal resistance Rth (j-a) 400 °C/W 1
Junction to leads thermal resistance Rth (j-l) 150 °C/W 1

CAD (KiCad official)

  • Symbol: DB3
  • Footprint: Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal
  • 3D model: DO-35 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: STMicroelectronics datasheet (4 pp, sha256 e65579e58dddd878, retrieved 2026-10-21, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins, primary cathode-band convention (convention), consensus off (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF