component
SZ1SMB24AT3G
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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README
markdownSZ1SMB24AT3G
Littelfuse · ESD And Surge Protection (TVS/ESD) · SMB
SZ1SMB24AT3G 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 |
|---|---|---|---|---|---|---|---|
| Breakdown Voltage VBR | VBR | 26.7 | 28.1 | 29.5 | V | @ IT = 1.0 mA; TA = 25°C (Note 7) | 3 |
| 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 | ||
| DC Power Dissipation (FR-4 minimum footprint) | PD | 0.55 | W | TA = 25°C (Note 3) | 1 | ||
| Forward Surge Current | IFSM | 100 | A | TA = 25°C; 1/2 sine wave, PW = 8.3 ms, 4 pulses per minute max (Note 4, unidirectional only) | 1 | ||
| Operating and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 1 | ||
| Reverse Leakage Current | IR | 5 | µA | @ VRWM = 24 V | 3 | ||
| Clamping Voltage | VC | 38.9 | V | @ IPP = 15.4 A (Note 8: surge per Figure 1) | 3 | ||
| Maximum Reverse Peak Pulse Current | IPP | 15.4 | A | Note 8: surge current waveform per Figure 1 | 3 | ||
| Working Peak Reverse Voltage | VRWM | 24 | V | 3 | |||
| Junction Capacitance | C | 675 | pF | Bias = 0 V, F = 1 MHz, TJ = 25°C (Note 9) | 3 | ||
| DC Power Derating above 75°C | 40 | mW/°C | Derate above TL = 75°C | 1 | |||
| Thermal Resistance Junction-to-Lead | RƟJL | 25 | °C/W | Measured zero lead length (Note 2) | 1 | ||
| DC Power Derating above 25°C | 4.4 | mW/°C | Derate above TA = 25°C (Note 3) | 1 | |||
| Thermal Resistance Junction-to-Ambient | RƟJL | 226 | °C/W | FR-4 board, Littelfuse minimum recommended footprint (Note 3) | 1 |
CAD (KiCad official)
- Symbol:
SZ1SMB24AT3G - Footprint:
Diode_SMD:D_SMB - 3D model: SMB (KiCad packages3D, STEP)
- 3D model files:
sz1smb24at3g-etched.step/sz1smb24at3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sz1smb24at3g.step/sz1smb24at3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (8 pp, sha256
c6158fa7c0646329, retrieved 2026-10-15, 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).