component
SZ1.5SMC43AT3G
Public Made by Adomby adom
Littelfuse TVS, SMC. 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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Contents
README
markdownSZ1.5SMC43AT3G
Littelfuse · TVS · SMC
SZ1.5SMC43AT3G from Littelfuse, in a SMC. 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 unidirectional TVS diode, marked by the color band; connect to the positive/protected line, with the device clamping at VC 59.3 V max at IPP 25.3 A (VRWM 36.8 V). |
| 2 | Anode | passive | Anode of the unidirectional TVS diode, connected to the return/ground side of the protected circuit. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | SMC |
| 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 | 40.9 | 43 | 45.2 | V | @ IT = 1 mA, TA = 25°C | 2 |
| Working Peak Reverse Voltage | VRWM | 36.8 | V | 2 | |||
| Maximum Reverse Leakage Current | IR | 5 | µA | @ VRWM | 2 | ||
| Maximum Clamping Voltage | VC | 59.3 | V | @ IPP = 25.3 A | 2 | ||
| Maximum Reverse Peak Pulse Current | IPP | 25.3 | A | 2 | |||
| Forward Voltage | VF | 3.5 | V | @ IF = 100 A | 2 | ||
| Peak Power Dissipation | PPK | 1500 | W | TL = 25°C, Pulse Width = 1 ms | 1 | ||
| DC Power Dissipation (lead) | PD | 4 | W | TL = 75°C, zero lead length | 1 | ||
| DC Power Dissipation (ambient) | PD | 0.75 | W | TA = 25°C, FR-4 board min footprint | 1 | ||
| Forward Surge Current | IFSM | 200 | A | TA = 25°C, 1/2 sine wave, PW = 8.3 ms | 1 | ||
| Operating and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 1 | ||
| Thermal Resistance Junction-to-Lead | RθJL | 18.3 | °C/W | 1 | |||
| Thermal Resistance Junction-to-Ambient | RθJA | 165 | °C/W | 1 | |||
| Derating above 75°C | 54.6 | mW/°C | Above 75°C, lead | 1 | |||
| Derating above 25°C | 6.1 | mW/°C | Above 25°C, ambient | 1 | |||
| Breakdown Voltage Temperature Coefficient | MV BR | 0.101 | %/°C | TYP. | 2 |
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 | Terminal Matte Tin-plated leads, Solderable per JESD22-B102 | 4 |
CAD (KiCad official)
- Symbol:
SZ1.5SMC43AT3G - Footprint:
Diode_SMD:D_SMC - 3D model: SMC (KiCad packages3D, STEP)
- 3D model files:
sz1-5smc43at3g-etched.step/sz1-5smc43at3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sz1-5smc43at3g.step/sz1-5smc43at3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (5 pp, sha256
c2c04b53fefd210a, retrieved 2026-10-27, 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).