component
SMAJ18A-13-F
Public Made by Adomby adom
Diodes Incorporated TVS, SMA. Pinout cross-checked by two models against the datasheet, 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-13-F
Diodes Incorporated · TVS · SMA
SMAJ18A-13-F from Diodes Incorporated, 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 terminal, marked by the cathode band on the unidirectional SMAJ18A, which has 18 V reverse standoff voltage, 20.0 V to 22.1 V breakdown at 1.0 mA and 29.2 V maximum clamping at 13.7 A. |
| 2 | A | passive | Anode terminal, the end without the cathode band, which conducts forward with a maximum VF of 3.5 V at 35 A and is the return side for the 400 W peak pulse rating. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| 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 |
|---|---|---|---|---|---|---|---|
| Reverse Standoff Voltage | VRWM | 18 | V | SMAJ18A, TA=+25°C | 3 | ||
| Breakdown Voltage | VBR | 20 | 22.1 | V | @ IT = 1.0 mA, measured with IT pulse 10ms to 15ms | 3 | |
| Test Current | IT | 1 | mA | SMAJ18A | 3 | ||
| Max Reverse Leakage | IR | 5 | µA | @ VRWM | 3 | ||
| Max Clamping Voltage | VC | 29.2 | V | @ IPP = 13.7 A | 3 | ||
| Max Peak Pulse Current | IPP | 13.7 | A | 3 | |||
| Peak Pulse Power Dissipation | PPK | 400 | W | Non-repetitive current pulse, derated above TA=+25°C | 2 | ||
| Peak Forward Surge Current | IFSM | 40 | A | 8.3ms single half sine wave superimposed on rated load, unidirectional only | 2 | ||
| Steady State Power Dissipation | PM(AV) | 1 | W | @ TL = +75°C | 2 | ||
| Instantaneous Forward Voltage | VF | 3.5 | V | @ IPP = 35A, unidirectional only | 2 | ||
| Operating Temperature Range | TJ | -55 | 150 | °C | 2 | ||
| Storage Temperature Range | TSTG | -55 | 150 | °C | 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 | tin | Terminals: Lead-Free Plating (Matte Tin Finish). Solderable per MIL-STD-202, Method 208 | 1 |
CAD (KiCad official)
- Symbol:
SMAJ18A-13-F - Footprint:
Diode_SMD:D_SMA - 3D model: SMA (KiCad packages3D, STEP)
- 3D model files:
smaj18a-13-f-etched.step/smaj18a-13-f-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smaj18a-13-f.step/smaj18a-13-f.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Diodes Incorporated datasheet (6 pp, sha256
70c17cee9c231f90, retrieved 2026-10-24, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-sonnet-5-5(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).