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TMMDB3TG

Public Made by Adom

by adom

STMicroelectronics Diacs Trigger Diode, MiniMELF. 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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3D Model

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Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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Contents

README

markdown

TMMDB3TG

STMicroelectronics · Diacs Trigger Diode · MiniMELF

TMMDB3TG from STMicroelectronics, in a MiniMELF. 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 MiniMELF
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 30 32 34 V C = 10 nF 2
Breakover voltage symmetry /VBO1 - VBO2/ 2 V C = 10 nF 2
Dynamic breakover voltage ΔV 9 V VBO and VF at 10 mA 2
Output voltage VO 5 V See Figure 2. Test circuit, (R = 20 Ω) 2
Breakover current IBO 15 µA C = 10 nF 2
Rise time tr 2 µs See Figure 3. Rise time measurement 2
Leakage current IR 10 µA VR = 0.5 x VBO max 2
Peak current IP 0.3 A See Figure 2. Test circuit 2
Repetitive peak on-state current ITRM 2 A tp = 20 µs, F = 120 Hz 2
Storage junction temperature range Tstg -40 125 °C 2
Operating junction temperature range Tj -40 125 °C 2

CAD (KiCad official)

  • Symbol: TMMDB3TG
  • Footprint: Diode_SMD:D_MiniMELF
  • 3D model: MiniMELF (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: STMicroelectronics datasheet (9 pp, sha256 956444b8cab54059, retrieved 2026-10-22, tier: manufacturer)
  • 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