component
SZ1SMB14AT3G
Public Made by Adomby adom
Littelfuse ESD And Surge Protection (TVS/ESD), SMB. 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
markdownSZ1SMB14AT3G
Littelfuse · ESD And Surge Protection (TVS/ESD) · SMB
SZ1SMB14AT3G 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 | Cathode | passive | Cathode terminal of the uni-directional TVS, identified by the cathode mark and color band on the package; the device is rated for a working peak reverse voltage VRWM of 14 V with a minimum breakdown voltage VBR of 15.6 V. |
| 2 | Anode | passive | Anode terminal of the uni-directional TVS, opposite the cathode mark; the device clamps transients at 23.2 V at a peak pulse current of 25.8 A per the electrical characteristics. |
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 | 15.6 | 16.4 | 17.2 | V | @ IT = 1.0 mA (Note 7) | 3 |
| Maximum reverse leakage current | IR | 5 | µA | @ VRWM | 3 | ||
| Clamping voltage | VC | 23.2 | V | @ IPP = 25.8 A (Note 8) | 3 | ||
| Forward voltage | VF | 3.5 | V | @ IF = 30 A (Note 5), uni-directional | 2 | ||
| Peak power dissipation | PPK | 600 | W | TL = 25°C, pulse width = 1 ms (Note 1) | 1 | ||
| DC power dissipation, measured zero lead length | PD | 3 | W | TL = 75°C (Note 2) | 1 | ||
| DC power dissipation | 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 (Note 4), unidirectional only | 1 | ||
| Operating and storage temperature range | TJ, Tstg | -65 | 150 | °C | 1 | ||
| Working peak reverse voltage | VRWM | 14 | V | (Note 6) | 3 | ||
| Typical junction capacitance | C | 1085 | pF | Bias voltage = 0 V, F = 1 MHz, TJ = 25°C (Note 9) | 3 | ||
| Thermal resistance, junction-to-lead | RθJL | 40 | °C/W | Measured zero lead length (Note 2) | 1 | ||
| Thermal resistance, junction-to-ambient | RθJA | 226 | °C/W | FR-4 board, Littelfuse 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:
SZ1SMB14AT3G - Footprint:
Diode_SMD:D_SMB - 3D model: SMB (KiCad packages3D, STEP)
- 3D model files:
sz1smb14at3g-etched.step/sz1smb14at3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sz1smb14at3g.step/sz1smb14at3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (7 pp, sha256
b867ff8d1ae59140, retrieved 2026-10-16, 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).