component
1KSMB18A
Public Made by Adomby adom
Littelfuse TVS, DO-214AA(SMBJ). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
| Name | Last updated |
|---|---|
| docs | 10h ago |
| viewers | 10h ago |
| 1ksmb18a-etched.glb | 10h ago |
| 1ksmb18a-etched.step | 10h ago |
| 1ksmb18a-hero.glb | 10h ago |
| 1ksmb18a-hero.overlay.json | 10h ago |
| 1ksmb18a.glb | 10h ago |
| 1ksmb18a.kicad_mod | 10h ago |
| 1ksmb18a.kicad_sym | 10h ago |
| 1ksmb18a.lbr | 10h ago |
| 1ksmb18a.step | 10h ago |
| package.json | 10h ago |
| page.json | 10h ago |
| README.md | 10h ago |
1KSMB18A
Littelfuse · TVS · DO-214AA(SMBJ)
1KSMB18A 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; connects to the protected line and is the positive side of the 15.3V stand-off, 17.10-18.90V breakdown at 1mA, 25.5V clamp at 39.2A device. |
| 2 | Anode | passive | Anode terminal of the unidirectional TVS, normally connected to ground or return; forward voltage is max 3.5V at 50A. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | DO-214AA(SMBJ) |
| 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 |
|---|---|---|---|---|---|---|---|
| Reverse Stand-off Voltage | VR | 15.3 | V | 2 | |||
| Breakdown Voltage | VBR | 17.1 | 18.9 | V | @ IT = 1 mA | 2 | |
| Maximum Clamping Voltage | VC | 25.5 | V | @ Ipp = 39.2 A | 2 | ||
| Maximum Peak Pulse Current | Ipp | 39.2 | 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 | ||
| Thermal Resistance Junction to Lead | RθJL | 20 | °C/W | Typical | 1 | ||
| Thermal Resistance Junction to Ambient | RθJA | 100 | °C/W | Typical | 1 | ||
| Breakdown Voltage Temperature Coefficient | αT | 0.1 | % | typical value | 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:
1KSMB18A - Footprint:
Diode_SMD:D_SMB - 3D model: DO-214AA(SMBJ) (KiCad packages3D, STEP)
- 3D model files:
1ksmb18a-etched.step/1ksmb18a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1ksmb18a.step/1ksmb18a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (6 pp, sha256
5456789e35da8ee5, retrieved 2026-10-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-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).