component

1KSMB43A

Public Made by Adom

by adom

Littelfuse TVS, DO-214AA(SMBJ). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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1KSMB43A

Littelfuse · TVS · DO-214AA(SMBJ)

1KSMB43A from Littelfuse, in a DO-214AA(SMBJ). 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 unidirectional TVS, marked by the color band on the body; stand-off voltage VR 36.8V, breakdown voltage 40.9V min to 45.2V max at 1mA, and max clamping voltage 59.3V at 16.9A Ipp.
2 Anode passive Anode terminal of the unidirectional TVS (no band), with maximum forward voltage VF of 3.5V at 50A.

Key specifications

Parameter Value
Manufacturer Littelfuse
Package DO-214AA(SMBJ)
Category TVS/Fuse/Board Level 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
Reverse Stand-off Voltage VR 36.8 V TA=25°C 2
Breakdown Voltage VBR 40.9 45.2 V @ IT = 1 mA 2
Test Current IT 1 mA TA=25°C 2
Maximum Clamping Voltage VC 59.3 V @ Ipp = 16.9 A 2
Maximum Peak Pulse Current Ipp 16.9 A 2
Maximum Reverse Leakage IR 1 µA @ VR 2
Peak Pulse Power Dissipation PPPM 1000 W TA=25ºC, 10/1000µs waveform 1
Power Dissipation on Infinite Heat Sink PD 5 W TL=50°C 1
Peak Forward Surge Current IFSM 120 A 8.3ms single half sine wave, unidirectional only 1
Maximum Instantaneous Forward Voltage VF 3.5 V at 50A, unidirectional only 1
Operating Temperature Range TJ -65 150 °C 1
Storage Temperature Range TSTG -65 175 °C 1
Typical Thermal Resistance Junction to Lead RθJL 20 °C/W 1
Typical Thermal Resistance Junction to Ambient RθJA 100 °C/W 1
Breakdown Voltage Temperature Coefficient αT 0.1 % VBR@TJ = VBR@25°C x (1+αT x (TJ-25)) 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 • Matte tin lead-free Plated • Available in breakdown 1

CAD (KiCad official)

  • Symbol: 1KSMB43A
  • Footprint: Diode_SMD:D_SMB
  • 3D model: DO-214AA(SMBJ) (KiCad packages3D, STEP)
  • 3D model files: 1ksmb43a-etched.step / 1ksmb43a-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 1ksmb43a.step / 1ksmb43a.glb are the bare package body.

Provenance

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

  • Datasheet: Littelfuse datasheet (6 pp, sha256 5456789e35da8ee5, retrieved 2026-10-26, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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