component

SZ1SMB18CAT3G

Public Made by Adom

by 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.

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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
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sz1smb18cat3g-etched.step sz1smb18cat3g: factory component page (tier=lcsc) · Ray 16d ago
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SZ1SMB18CAT3G

Littelfuse · ESD And Surge Protection (TVS/ESD) · SMB

SZ1SMB18CAT3G 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 20 21.06 22.1 V @ IT = 1.0 mA, 25°C (Note 7) 4
Clamping Voltage VC 29.2 V @ IPP = 20.5 A (Note 8) 4
Maximum Reverse Peak Pulse Current IPP 20.5 A Surge per Note 8 (Figure 1) 4
Maximum Reverse Leakage Current IR 5 µA @ VRWM = 18 V 4
Working Peak Reverse Voltage VRWM 18 V Note 6: should be ≥ DC or continuous peak operating voltage 4
Peak Power Dissipation PPK 600 W TL = 25°C, pulse width = 1 ms (Note 1) 1
DC Power Dissipation PD 3 W @ TL = 75°C, measured zero lead length (Note 2) 1
DC Power Dissipation PD 0.55 W @ TA = 25°C (Note 3) 1
Operating and Storage Temperature Range TJ, Tstg -65 150 °C 1
Thermal Resistance from Junction-to-Lead RƟJL 40 °C/W Measured at zero lead length (Note 2) 1
Thermal Resistance from Junction-to-Ambient RƟJA 226 °C/W FR-4 board, Littelfuse minimum recommended footprint (Note 3) 1
DC Power Derating PD 25 mW/°C Derate above 75°C 1
DC Power Derating PD 4.4 mW/°C Derate above 25°C (Note 3) 1

CAD (KiCad official)

  • Symbol: SZ1SMB18CAT3G
  • Footprint: Diode_SMD:D_SMB
  • 3D model: SMB (KiCad packages3D, STEP)
  • 3D model files: sz1smb18cat3g-etched.step / sz1smb18cat3g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sz1smb18cat3g.step / sz1smb18cat3g.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Littelfuse datasheet (7 pp, sha256 b867ff8d1ae59140, retrieved 2026-10-15, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins, primary cathode-band convention (convention), consensus off (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).

Datasheet PDF