component
1KSMB18A
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Littelfuse TVS, DO-214AA(SMBJ). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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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).
# 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.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1ksmb18a.step` / `1ksmb18a.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Littelfuse datasheet](docs/1ksmb18a-datasheet.pdf) (6 pp, sha256 `5456789e35da8ee5`, retrieved 2026-10-22, 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](docs/1ksmb18a-datasheet.pdf)