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SZ1SMA28CAT3G
Public Made by Adomby adom
Littelfuse 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
markdownSZ1SMA28CAT3G
Littelfuse · TVS · SMA
SZ1SMA28CAT3G from Littelfuse, 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 | Cathode | passive | Terminal 1 is marked as cathode in the generic part-marking diagram, but the datasheet states the cathode indicator applies to uni-directional devices only, so this bi-directional part has no defined polarity. |
| 2 | Anode | passive | Terminal 2 is marked as anode in the generic part-marking diagram, and the device clamps transients with a 400 W peak power rating at 1 ms, per the datasheet. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | SMA |
| Category | TVS/Fuse/Board Level 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 | 31.1 | 32.74 | 34.37 | V | @ IT, IT = 1 mA | 4 |
| Maximum Reverse Leakage Current | IR | 2.5 | µA | @ VRWM | 4 | ||
| Peak Power Dissipation | PPK | 400 | W | TL = 25°C, pulse width 1 ms (Note 1) | 1 | ||
| DC Power Dissipation @ TL | PD | 1.5 | W | TL = 75°C, measured zero lead length (Note 2) | 1 | ||
| DC Power Dissipation @ TA | PD | 0.5 | W | TA = 25°C (Note 3) | 1 | ||
| Operating and Storage Temperature Range | TJ, Tstg | -65 | 175 | °C | 1 | ||
| Clamping Voltage | VC | 45.4 | V | @ IPP, IPP = 8.8 A | 4 | ||
| Working Peak Reverse Voltage | VRWM | 28 | V | 4 | |||
| Thermal Resistance from Junction-to-Lead | RθJL | 50 | °C/W | 1 | |||
| Thermal Resistance from Junction-to-Ambient | RθJA | 120 | °C/W | 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 | the terminal finish material is tin(Sn) (IPC/JEDEC J-STD609A.01) | 1 |
CAD (KiCad official)
- Symbol:
SZ1SMA28CAT3G - Footprint:
Diode_SMD:D_SMA - 3D model: SMA (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (7 pp, sha256
28d8bdc1607bd94e, retrieved 2026-11-02, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-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).