component

SZ1SMB48AT3G

Public Made by Adom

by adom

Littelfuse TVS, SMB. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentcircuit protectionsz1smb48at3gfactory-2.0.0extractor-text
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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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docs Publish 0.1.0 · Ray 9d ago
viewers sz1smb48at3g: symbol repaired (D_Zener, cathode pad 1) · Ray 1d ago
package.json Publish 0.1.0 · Ray 9d ago
page.json Set visibility: public · Ray 9d ago
README.md Publish 0.1.0 · Ray 9d ago
sz1smb48at3g-etched.glb Publish 0.1.0 · Ray 9d ago
sz1smb48at3g-etched.step sz1smb48at3g: factory component page (tier=lcsc) · Ray 9d ago
sz1smb48at3g-hero.glb sz1smb48at3g: hero GLB from the etched model (keeps the MPN mark) · Ray 9d ago
sz1smb48at3g-hero.overlay.json Publish 0.1.0 · Ray 9d ago
sz1smb48at3g.glb Publish 0.1.0 · Ray 9d ago
sz1smb48at3g.kicad_mod Publish 0.1.0 · Ray 9d ago
sz1smb48at3g.kicad_sym sz1smb48at3g: symbol repaired (D_Zener, cathode pad 1) · Ray 1d ago
sz1smb48at3g.lbr sz1smb48at3g: symbol repaired (D_Zener, cathode pad 1) · Ray 1d ago
sz1smb48at3g.step Publish 0.1.0 · Ray 9d ago

SZ1SMB48AT3G

Littelfuse · TVS · SMB

SZ1SMB48AT3G 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 of the uni-directional TVS, marked by the color band on the package; the device is rated for a 48 V working peak reverse voltage (VRWM) for the SZ1SMB48AT3G, with a 1.0 mA breakdown test current.
2 Anode passive Anode of the uni-directional TVS; forward voltage is 3.5 V max at 30 A forward current (Note 5, 1/2 sine wave, 8.3 ms non-repetitive).

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) min VBR 53.3 V IT = 1.0 mA, TA = 25°C (Note 7), uni-directional SZ1SMB48AT3G 3
Breakdown Voltage (VBR) max VBR 58.9 V IT = 1.0 mA, TA = 25°C (Note 7), uni-directional SZ1SMB48AT3G 3
Breakdown Voltage (VBR) nominal VBR 56.1 V IT = 1.0 mA, TA = 25°C (Note 7), uni-directional SZ1SMB48AT3G 3
Maximum Reverse Leakage Current IR 5 µA @ VRWM = 48 V 3
Maximum Clamping Voltage VC 77.4 V @ IPP = 7.7 A (Note 8) 3
Maximum Reverse Peak Pulse Current IPP 7.7 A Listed with VC for SZ1SMB48AT3G (Note 8) 3
Working Peak Reverse Voltage VRWM 48 V Note 6: selected to be equal to or greater than the DC operating voltage 3
Breakdown Test Current IT 1 mA Test current for VBR 3
Typical Junction Capacitance C 365 pF Bias Voltage = 0 V, F = 1 MHz, TJ = 25°C (Note 9) 3
Forward Voltage VF 3.5 V IF = 30 A (Note 5: 1/2 sine wave, PW = 8.3 ms, non-repetitive); uni-directional 2
Peak Power Dissipation PPK 600 W TL = 25°C, Pulse Width = 1 ms, 10/1000 µs non-repetitive (Note 1) 1
DC Power Dissipation @ TL = 75°C PD 3 W Measured zero lead length, 1 in² copper pad FR-4 (Note 2) 1
Derate Above 75°C (lead) PD 40 mW/°C Derate above TL = 75°C 1
Thermal Resistance Junction-to-Lead RθJL 25 °C/W Junction-to-lead 1
DC Power Dissipation @ TA = 25°C PD 0.55 W TA = 25°C, FR-4 minimum recommended footprint (Note 3) 1
Derate Above 25°C (ambient) PD 4.4 mW/°C Derate above TA = 25°C 1
Thermal Resistance Junction-to-Ambient RθJA 226 °C/W Junction-to-ambient, FR-4 minimum recommended footprint 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), uni-directional only 1
Operating Junction Temperature Range TJ -65 150 °C Operating junction temperature 1
Storage Temperature Range Tstg -65 150 °C Storage temperature 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: SZ1SMB48AT3G
  • Footprint: Diode_SMD:D_SMB
  • 3D model: SMB (KiCad packages3D, STEP)
  • 3D model files: sz1smb48at3g-etched.step / sz1smb48at3g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sz1smb48at3g.step / sz1smb48at3g.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 2026-10-28, 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