component
SZ1SMB26AT3G
Public Made by Adomby adom
Littelfuse TVS, SMB. 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 | 9d ago |
| viewers | 9d ago |
| package.json | 9d ago |
| page.json | 9d ago |
| README.md | 9d ago |
| sz1smb26at3g-etched.glb | 9d ago |
| sz1smb26at3g-etched.step | 9d ago |
| sz1smb26at3g-hero.glb | 9d ago |
| sz1smb26at3g-hero.overlay.json | 9d ago |
| sz1smb26at3g.glb | 9d ago |
| sz1smb26at3g.kicad_mod | 9d ago |
| sz1smb26at3g.kicad_sym | 9d ago |
| sz1smb26at3g.lbr | 9d ago |
| sz1smb26at3g.step | 9d ago |
SZ1SMB26AT3G
Littelfuse · TVS · SMB
SZ1SMB26AT3G from Littelfuse, in a SMB. 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 (color band side), connected to the protected positive line; VRWM 26 V, VBR 28.9-31.9 V at 1.0 mA, VC 42.1 V at 14.2 A. |
| 2 | Anode | passive | Anode of the uni-directional TVS diode, normally connected to ground/return, with the cathode marked by a color band. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | SMB |
| 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 |
|---|---|---|---|---|---|---|---|
| Working Peak Reverse Voltage | VRWM | 26 | V | 3 | |||
| Breakdown Voltage | VBR | 28.9 | 30.4 | 31.9 | V | @ IT = 1.0 mA | 3 |
| Maximum Reverse Leakage Current | IR | 5 | µA | @ VRWM | 3 | ||
| Clamping Voltage | VC | 42.1 | V | @ IPP = 14.2 A | 3 | ||
| Maximum Reverse Peak Pulse Current | IPP | 14.2 | A | 3 | |||
| Forward Voltage | VF | 3.5 | V | IF = 30 A, TA = 25°C, Uni-directional | 2 | ||
| Typical Capacitance | C | 630 | pF | Bias Voltage = 0 V, F = 1 MHz, TJ = 25°C | 3 | ||
| Peak Power Dissipation | PPK | 600 | W | TL = 25°C, Pulse Width = 1 ms (10/1000 µs, non-repetitive) | 1 | ||
| DC Power Dissipation | PD | 3 | W | TL = 75°C, zero lead length | 1 | ||
| DC Power Dissipation | PD | 0.55 | W | TA = 25°C, FR-4 board, minimum recommended footprint | 1 | ||
| Forward Surge Current | IFSM | 100 | A | TA = 25°C, 1/2 sine wave PW = 8.3 ms, Uni-directional only | 1 | ||
| Operating and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 1 | ||
| Thermal Resistance Junction-to-Lead | RθJL | 25 | °C/W | 1 | |||
| Thermal Resistance Junction-to-Ambient | RθJA | 226 | °C/W | 1 | |||
| Derating above 75°C | 40 | mW/°C | Above TL = 75°C | 1 | |||
| Derating above 25°C | 4.4 | mW/°C | Above TA = 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:
SZ1SMB26AT3G - Footprint:
Diode_SMD:D_SMB - 3D model: SMB (KiCad packages3D, STEP)
- 3D model files:
sz1smb26at3g-etched.step/sz1smb26at3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sz1smb26at3g.step/sz1smb26at3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (7 pp, sha256
b867ff8d1ae59140, retrieved 2026-10-22, 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).