component
SMAJ18A R3G
Public Made by Adomby adom
Taiwan Semiconductor(Taiwan Semicon) TVS, 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
markdownSMAJ18A R3G
Taiwan Semiconductor(Taiwan Semicon) · TVS · SMA
SMAJ18A R3G from Taiwan Semiconductor(Taiwan Semicon), in a 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 | Taiwan Semiconductor(Taiwan Semicon) |
| Package | 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 |
|---|---|---|---|---|---|---|---|
| Breakdown voltage | VBR | 20 | 22.1 | V | IT = 1 mA; pulse test PW=30 ms (Note 1) | 2 | |
| Maximum reverse leakage current at VWM | IR | 1 | µA | VWM = 18 V; pulse test PW=30 ms (Note 1) | 2 | ||
| Maximum peak impulse current | IPPM | 13.7 | A | Non-repetitive 10/1000 µs pulse per Fig. 3 (Note 2) | 2 | ||
| Maximum clamping voltage at IPPM | VC | 29.2 | V | IPPM = 13.7 A; non-repetitive 10/1000 µs pulse (Note 2) | 2 | ||
| Peak power dissipation | PPK | 400 | W | TA=25°C, tp=1ms (Note 1) | 1 | ||
| Steady state power dissipation | PD | 1 | W | Steady state | 1 | ||
| Peak forward surge current | IFSM | 40 | A | 8.3 ms single half sine-wave superimposed on rated load | 1 | ||
| Maximum instantaneous forward voltage | VF | 3.5 | V | At 25 A, unidirectional only | 1 | ||
| Operating junction temperature range | TJ | -55 | 150 | °C | 1 | ||
| Storage temperature range | TSTG | -55 | 150 | °C | 1 |
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 | tin | ● Matte tin plated leads, solderable per J-STD-002 ● Meet JESD 201 class 2 whisker test | 1 |
CAD (KiCad official)
- Symbol:
SMAJ18A R3G - Footprint:
Diode_SMD:D_SMA - 3D model: SMA (KiCad packages3D, STEP)
- 3D model files:
smaj18a-r3g-etched.step/smaj18a-r3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smaj18a-r3g.step/smaj18a-r3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Taiwan Semiconductor(Taiwan Semicon) datasheet (8 pp, sha256
6a5d121244fc257f, retrieved 2026-10-28, 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).