component
SZ1SMA33AT3G
Public Made by Adomby adom
Littelfuse ESD And Surge Protection (TVS/ESD), 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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README
markdownSZ1SMA33AT3G
Littelfuse · ESD And Surge Protection (TVS/ESD) · SMA
SZ1SMA33AT3G 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 terminal, identified by the polarity band on the package (the datasheet's Style 1 pin 1 designation), and the terminal that is positive relative to the anode under transient clamping. |
| 2 | ANODE | passive | Anode terminal of the unidirectional transient voltage suppressor, opposite the cathode polarity band. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| 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 leakage current at VRWM (maximum) | IR | 2.5 | µA | @ VRWM = 33 V | 3 | ||
| Breakdown voltage | VBR | 36.7 | 38.65 | 40.6 | V | @ IT = 1 mA | 3 |
| Maximum reverse peak pulse current | IPP | 7.5 | A | Table value for this device | 3 | ||
| Forward voltage | VF | 3.5 | V | @ IF = 30 A (all types) | 2 | ||
| Clamping voltage | VC | 53.3 | V | @ IPP = 7.5 A | 3 | ||
| Maximum junction capacitance | C | 375 | pF | Bias 0 V, F = 1.0 MHz, TJ = 25°C | 3 | ||
| Working peak reverse voltage | VRWM | 33 | V | 3 | |||
| Peak power dissipation | PPK | 400 | W | TL = 25°C, pulse width 1 ms (Note 1) | 1 | ||
| DC power dissipation | PD | 1 | W | TL = 75°C, measured zero lead length (Note 2) | 1 | ||
| DC power dissipation | PD | 0.5 | W | TA = 25°C, FR-4 minimum recommended footprint (Note 3) | 1 | ||
| Forward surge current | IFSM | 40 | A | TA = 25°C, 1/2 sine wave, PW = 8.3 ms (Note 4) | 1 | ||
| Operating and storage temperature range | TJ, Tstg | -65 | 150 | °C | 1 | ||
| Thermal resistance, junction to lead | RθJL | 50 | °C/W | Measured zero lead length (Note 2) | 1 | ||
| Thermal resistance, junction to ambient | RθJA | 250 | °C/W | FR-4 minimum recommended footprint (Note 3) | 1 |
CAD (KiCad official)
- Symbol:
SZ1SMA33AT3G - Footprint:
Diode_SMD:D_SMA - 3D model: SMA (KiCad packages3D, STEP)
- 3D model files:
sz1sma33at3g-etched.step/sz1sma33at3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sz1sma33at3g.step/sz1sma33at3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (5 pp, sha256
0efc269c31859c3d, retrieved 2026-10-15, 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).