component
SMAJ28A
Public Made by Adomby adom
MDD（Microdiode Electronics） TVS, DO-214AC(SMA). Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.
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
markdownSMAJ28A
MDD（Microdiode Electronics） · TVS · DO-214AC(SMA)
SMAJ28A from MDD（Microdiode Electronics）, in a DO-214AC(SMA). 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 | MDD（Microdiode Electronics） |
| Package | DO-214AC(SMA) |
| Category | Circuit Protection |
| 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 |
|---|---|---|---|---|---|---|---|
| Peak pulse power dissipation at 10/1000μs waveform | PPPM | 400 | W | 10/1000μs waveform (Note1, Note2, Fig.1); printed as 'Minimum 400 W' | 1 | ||
| Steady state power dissipation | PM(AV) | 3.3 | W | TA=50℃ (Fig.5) | 1 | ||
| Peak forward surge current | IFSM | 40 | A | 8.3ms single half sine-wave, superimposed on rated load (JEDEC Method) (Note3, Fig.6) | 1 | ||
| Operating junction and storage temperature range | TJ,TSTG | -65 | 150 | ℃ | 1 | ||
| Breakdown voltage | VBR | 31.1 | 34.4 | V | @IT test current 1 mA, TA=25℃ (SMAJ28A row) | 2 | |
| Maximum clamping voltage | VC | 45.4 | V | @IPP 8.8 A (SMAJ28A row) | 2 | ||
| Reverse leakage current | IR | 1 | μA | @VRWM (SMAJ28A row) | 2 | ||
| Typical thermal resistance junction to lead | RθJL | 30 | ℃/W | Typical | 1 | ||
| Typical thermal resistance junction to ambient | RθJA | 120 | ℃/W | Typical; mounted on 5.0mm×5.0mm copper pads (Note 2) | 1 | ||
| Reverse stand-off voltage | VRWM | 28 | V | Unidirectional SMAJ28A row | 2 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper | 2. Mounted on 5.0mm×5.0mm (0.03mm thick) copper pads to each terminal. | 1 |
CAD (KiCad official)
- Symbol:
SMAJ28A - Footprint:
Diode_SMD:D_SMA - 3D model: DO-214AC(SMA) (KiCad packages3D, STEP)
- 3D model files:
smaj28a-etched.step/smaj28a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smaj28a.step/smaj28a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: MDD（Microdiode Electronics） datasheet (5 pp, sha256
2bd81a6a2db3710e, retrieved 2026-10-21, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins, primarycathode-band convention(convention), consensusoff(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).