component

SMA4749A

Public Made by Adom

by adom

DOWO Zener Diodes, SMA(DO-214AC). 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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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
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SMA4749A

DOWO · Zener Diodes · SMA(DO-214AC)

SMA4749A from DOWO, in a SMA(DO-214AC). 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 DOWO
Package SMA(DO-214AC)
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
Zener voltage (nominal VZ at IZT) VZ 22.8 24 25.2 V at IZT = 10.5 mA 2
Reverse leakage current IR 0.1 uA at VR = 18.2 V 2
Maximum Zener impedance ZZT 25 Ω at IZT = 10.5 mA 2
Maximum Zener knee impedance ZZK 750 Ω at IZK = 0.25 mA 2
Forward voltage VF 1.2 V at IF = 200mA 1
Total power dissipation at TA=50°C (derate above 50°C) Ptot 1.25 W TA=50°C, derate above 50°C; mounted on 5mm x 5mm Cu pad test board 1
Total power dissipation at TA=75°C Ptot 1 W TA=75°C 1
Junction temperature TJ -55 150 °C 1
Storage temperature TSTG -55 150 °C 1
Zener voltage tolerance (suffix A) -10 10 % Suffix A per datasheet note; conflicts with table min/max (±5%) 2
Junction-to-lead thermal resistance per diode RӨJL 29 °C/W Units mounted on recommended PCB (5mm x 5mm Cu pad test board) 1
Junction-to-ambient thermal resistance per diode RӨJA 120 °C/W Units mounted on recommended PCB (5mm x 5mm Cu pad test board) 1
Junction-to-case thermal resistance per diode RӨJC 31 °C/W Units mounted on recommended PCB (5mm x 5mm Cu pad test board) 1

CAD (KiCad official)

  • Symbol: SMA4749A
  • Footprint: Diode_SMD:D_SMA
  • 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
  • 3D model files: sma4749a-etched.step / sma4749a-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sma4749a.step / sma4749a.glb are the bare package body.

Provenance

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

  • Datasheet: DOWO datasheet (3 pp, sha256 fa4e409573b7e829, 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