component

SZ1SMB48CAT3G

Public Made by Adom

by adom

Littelfuse ESD And Surge Protection (TVS/ESD), SMB. Pinout cross-checked by two models against the datasheet, 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
Name Last commit message Last updated
docs Publish 0.1.0 · Ray 21d ago
viewers sz1smb48cat3g: symbol repaired (D_Zener, cathode pad 1) · Ray 1d ago
package.json Publish 0.1.0 · Ray 21d ago
page.json Set visibility: public · Ray 21d ago
README.md Publish 0.1.0 · Ray 21d ago
sz1smb48cat3g-etched.glb Publish 0.1.0 · Ray 21d ago
sz1smb48cat3g-etched.step sz1smb48cat3g: factory component page (tier=lcsc) · Ray 21d ago
sz1smb48cat3g-hero.glb sz1smb48cat3g: hero GLB from the etched model (keeps the MPN mark) · Ray 21d ago
sz1smb48cat3g-hero.overlay.json Publish 0.1.0 · Ray 21d ago
sz1smb48cat3g.glb Publish 0.1.0 · Ray 21d ago
sz1smb48cat3g.kicad_mod Publish 0.1.0 · Ray 21d ago
sz1smb48cat3g.kicad_sym sz1smb48cat3g: symbol repaired (D_Zener, cathode pad 1) · Ray 1d ago
sz1smb48cat3g.lbr sz1smb48cat3g: symbol repaired (D_Zener, cathode pad 1) · Ray 1d ago
sz1smb48cat3g.step Publish 0.1.0 · Ray 21d ago

SZ1SMB48CAT3G

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

SZ1SMB48CAT3G 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 Terminal labelled Cathode on the SMB package marking diagram, where the cathode mark (color band) identifies the cathode of uni-directional parts; the datasheet gives no polarity marking for the bi-directional SZ1SMB48CAT3G, whose working peak reverse voltage is 48 V with a 5.0 µA maximum reverse leakage at VRWM.
2 Anode passive Terminal labelled Anode on the SMB package marking diagram, paired with pin 1 for uni-directional parts; the datasheet gives no polarity marking for the bi-directional SZ1SMB48CAT3G, so both terminals are treated as interchangeable.

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 53.3 56.11 58.9 V @ IT = 1.0 mA (Note 7) 4
Maximum reverse leakage current IR 5 µA @ VRWM = 48 V 4
Clamping voltage VC 77.4 V @ IPP = 7.7 A (Note 8) 4
Working peak reverse voltage VRWM 48 V 4
Maximum reverse peak pulse current IPP 7.7 A Surge waveform per Note 8 4
Peak power dissipation PPK 600 W TL = 25°C, pulse width 1 ms, 10/1000 µs non-repetitive (Note 1) 1
Operating and storage temperature range TJ, Tstg -65 175 °C 1
DC power dissipation (lead) PD 3 W TL = 75°C, measured zero lead length (Note 2) 1
Derating above 75°C (lead) PD 40 mW/°C Derate above 75°C 1
Thermal resistance junction-to-lead RθJL 25 °C/W 1
DC power dissipation (ambient) PD 0.55 W TA = 25°C (Note 3) 1
Derating above 25°C (ambient) PD 4.4 mW/°C Derate above 25°C 1
Thermal resistance junction-to-ambient RθJA 100 °C/W Note 3 (FR-4, Littelfuse minimum recommended footprint) 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 the terminal finish material is tin(Sn) (IPC/JEDEC J-STD￾609A.01) 1

CAD (KiCad official)

  • Symbol: SZ1SMB48CAT3G
  • Footprint: Diode_SMD:D_SMB
  • 3D model: SMB (KiCad packages3D, STEP)
  • 3D model files: sz1smb48cat3g-etched.step / sz1smb48cat3g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sz1smb48cat3g.step / sz1smb48cat3g.glb are the bare package body.

Provenance

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

  • Datasheet: Littelfuse datasheet (7 pp, sha256 b0ca6934cecaf5e0, retrieved 2026-10-16, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF