component
SZ1SMA28AT3G
Public Made by Adomby adom
Littelfuse TVS, SMA. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
| Name | Last updated |
|---|---|
| docs | 14d ago |
| viewers | 5d ago |
| package.json | 14d ago |
| page.json | 14d ago |
| README.md | 14d ago |
| sz1sma28at3g-etched.glb | 14d ago |
| sz1sma28at3g-etched.step | 14d ago |
| sz1sma28at3g-hero.glb | 14d ago |
| sz1sma28at3g-hero.overlay.json | 14d ago |
| sz1sma28at3g.glb | 14d ago |
| sz1sma28at3g.kicad_mod | 14d ago |
| sz1sma28at3g.kicad_sym | 5d ago |
| sz1sma28at3g.lbr | 5d ago |
| sz1sma28at3g.step | 14d ago |
SZ1SMA28AT3G
Littelfuse · TVS · SMA
SZ1SMA28AT3G 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 | Cathode of the uni-directional TVS diode, marked by the color band/cathode indicator, connected to the positive side of the protected line with VRWM = 28 V. |
| 2 | Anode | passive | Anode of the uni-directional TVS diode, connected to the return/ground side of the protected line. |
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 |
|---|---|---|---|---|---|---|---|
| Working Peak Reverse Voltage | VRWM | 28 | V | 3 | |||
| Maximum Reverse Leakage Current | IR | 2.5 | µA | @ VRWM | 3 | ||
| Breakdown Voltage | VBR | 31.1 | 32.75 | 34.4 | V | @ IT = 1 mA | 3 |
| Clamping Voltage | VC | 45.4 | V | @ IPP = 8.8 A | 3 | ||
| Maximum Reverse Peak Pulse Current | IPP | 8.8 | A | 3 | |||
| Forward Voltage | VF | 3.5 | V | IF = 30 A, for all uni-directional types | 2 | ||
| Junction Capacitance | C | 430 | pF | Bias voltage = 0 V, F = 1.0 MHz, TJ = 25°C | 3 | ||
| Peak Power Dissipation | PPK | 400 | W | @ TL = 25°C, Pulse Width = 1 ms | 1 | ||
| DC Power Dissipation (lead) | PD | 1.5 | W | @ TL = 75°C, zero lead length, 1" square copper pad FR-4 | 1 | ||
| DC Power Dissipation (ambient) | PD | 0.5 | W | @ TA = 25°C, FR-4 board, minimum recommended footprint | 1 | ||
| Forward Surge Current | IFSM | 40 | A | @ TA = 25°C, 1/2 sine wave, PW = 8.3 ms (uni-directional) | 1 | ||
| Operating and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 1 | ||
| Thermal Resistance Junction-to-Lead | RƟJL | 50 | °C/W | 1 | |||
| Thermal Resistance Junction-to-Ambient | RƟJA | 250 | °C/W | 1 | |||
| Derating above 75°C | PD | 20 | mW/°C | Derate above 75°C | 1 | ||
| Derating above 25°C | PD | 4 | mW/°C | Derate above 25°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 | and the terminal finish material is tin(Sn) (IPC/ | 1 |
CAD (KiCad official)
- Symbol:
SZ1SMA28AT3G - Footprint:
Diode_SMD:D_SMA - 3D model: SMA (KiCad packages3D, STEP)
- 3D model files:
sz1sma28at3g-etched.step/sz1sma28at3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sz1sma28at3g.step/sz1sma28at3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (7 pp, sha256
2dcbd1b5c6bf6a05, retrieved 2026-10-26, tier: lcsc) - 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).