component
SZ1SMA40CAT3G
Public Made by Adomby adom
Littelfuse TVS, SMA. Pinout reviewed by a person 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
markdownSZ1SMA40CAT3G
Littelfuse · TVS · SMA
SZ1SMA40CAT3G 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, marked as pin 1 on the SMA part marking diagram; for uni-directional devices the color band denotes this cathode, and the datasheet specifies no polarity band for bi-directional devices. |
| 2 | Anode | passive | Anode terminal, marked as pin 2 on the SMA part marking diagram, with the uni-directional forward voltage limited to VF = 3.5 V max at IF = 30 A. |
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 |
|---|---|---|---|---|---|---|---|
| Breakdown Voltage | VBR | 44.4 | 46.74 | 49.07 | V | @ IT = 1 mA | 4 |
| Maximum Reverse Leakage Current | IR | 2.5 | µA | @ VRWM | 4 | ||
| Clamping Voltage | VC | 64.5 | V | @ IPP = 6.2 A | 4 | ||
| Working Peak Reverse Voltage | VRWM | 40 | V | 4 | |||
| Peak Power Dissipation | PPK | 400 | W | TL = 25°C, pulse width = 1 ms (Note 1: 10 x 1000 µs, non-repetitive) | 1 | ||
| DC Power Dissipation @ TL = 75°C | PD | 1.5 | W | TL = 75°C, measured zero lead length (Note 2) | 1 | ||
| Derate Above 75°C | 20 | mW/°C | Derate above TL = 75°C | 1 | |||
| DC Power Dissipation @ TA = 25°C | PD | 0.5 | W | TA = 25°C (Note 3) | 1 | ||
| Derate Above 25°C | 4 | mW/°C | Derate above TA = 25°C | 1 | |||
| Operating and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 1 | ||
| Thermal Resistance Junction-to-Lead | RθJL | 50 | °C/W | Junction-to-lead, 1" square copper pad, FR-4 (Note 2) | 1 | ||
| Thermal Resistance Junction-to-Ambient | RθJA | 250 | °C/W | Junction-to-ambient, FR-4 minimum recommended footprint (Note 3) | 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:
SZ1SMA40CAT3G - Footprint:
Diode_SMD:D_SMA - 3D model: SMA (KiCad packages3D, STEP)
- 3D model files:
sz1sma40cat3g-etched.step/sz1sma40cat3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sz1sma40cat3g.step/sz1sma40cat3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (7 pp, sha256
2dcbd1b5c6bf6a05, retrieved 2026-10-22, 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).