component
SZ1SMB33CAT3G
Public Made by Adomby adom
Littelfuse ESD And Surge Protection (TVS/ESD), SMB. 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
markdownSZ1SMB33CAT3G
Littelfuse · ESD And Surge Protection (TVS/ESD) · SMB
SZ1SMB33CAT3G 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 | 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 | 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 |
|---|---|---|---|---|---|---|---|
| Maximum Reverse Leakage Current | IR | 5 | µA | @ VRWM = 33 V | 4 | ||
| Breakdown Voltage | VBR | 36.7 | 38.63 | 40.6 | V | @ IT = 1.0 mA; Note 7: TA = 25°C | 4 |
| Peak Power Dissipation | PPK | 600 | W | TL = 25°C, pulse width 1 ms; Note 1: 10/1000 µs, non-repetitive | 1 | ||
| DC Power Dissipation (measured zero lead length) | PD | 3 | W | TL = 75°C; Note 2: 1 in² square copper pad, FR-4 | 1 | ||
| DC Power Dissipation | PD | 0.55 | W | TA = 25°C; Note 3: FR-4, Littelfuse minimum recommended footprint | 1 | ||
| Thermal Resistance Junction-to-Lead | RθJL | 25 | °C/W | Junction-to-lead | 1 | ||
| Thermal Resistance Junction-to-Ambient | RθJA | 226 | °C/W | Junction-to-ambient | 1 | ||
| Operating and Storage Temperature Range | TJ, Tstg | -65 | 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 | and the terminal finish material is tin(Sn) (IPC/ | 1 |
CAD (KiCad official)
- Symbol:
SZ1SMB33CAT3G - Footprint:
Diode_SMD:D_SMB - 3D model: SMB (KiCad packages3D, STEP)
- 3D model files:
sz1smb33cat3g-etched.step/sz1smb33cat3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sz1smb33cat3g.step/sz1smb33cat3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (7 pp, sha256
65da9111b3725ff5, retrieved 2026-10-16, 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).