# TPSMB22A

**Littelfuse** · TVS · DO-214AA

TPSMB22A from Littelfuse, in a DO-214AA. 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 | K | passive | Cathode of the unidirectional TVS diode, marked by the color/cathode band on the DO-214AA (SMB J-Bend) body; the TPSMB22A has a 18.80 V min to 23.10 V max breakdown voltage and 20.9 V... see standoff 18.80 V VR. |
| 2 | A | passive | Anode of the unidirectional TVS diode on the DO-214AA (SMB J-Bend) package, the terminal opposite the cathode band, with a maximum clamping voltage of 30.6 V at 19.9 A peak pulse current. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | DO-214AA |
| 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 | 20.9 |  | 23.1 | V | @ IT = 1 mA (TPSMB22A column Min 18.80 / Max 23.10 as printed) | 2 |
| Breakdown Voltage (minimum column) | VBR | 18.8 |  |  | V | @ IT = 1 mA | 2 |
| Maximum Clamping Voltage | VC |  |  | 30.6 | V | @ Ipp = 19.9 A | 2 |
| Maximum Peak Pulse Current | Ipp |  |  | 19.9 | A |  | 2 |
| Maximum Reverse Leakage | IR |  |  | 1 | µA | @ VR | 2 |
| Maximum Temperature coefficient of VBR | αT |  |  | 0.088 | %/C |  | 2 |
| Peak Pulse Power Dissipation | PPPM |  |  | 600 | W | 10/1000µs waveform, TA=25°C | 1 |
| Power Dissipation on infinite heat sink | PM(AV) |  |  | 5 | W | TL=50°C | 1 |
| Peak Forward Surge Current | IFSM |  |  | 100 | A | 8.3ms single half sine wave, unidirectional only | 1 |
| Maximum Instantaneous Forward Voltage | VF |  |  | 3.5 | V | at 50A, unidirectional only; VF<3.5V for Vbr<300V | 1 |
| Operating Junction Temperature Range | TJ | -65 |  | 175 | °C | VBR≤91V | 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 |
| Reverse Stand off Voltage | VR |  | 18.8 |  | V |  | 2 |
| Typical IR at 150°C | IR |  | 8 |  | µA | @150°C | 2 |

## 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 | 260°C/10 seconds at terminals ■ Matte tin lead-free plated | 1 |

## CAD (KiCad official)

- Symbol: `TPSMB22A`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: DO-214AA (KiCad packages3D, STEP)
- 3D model files: `tpsmb22a-etched.step` / `tpsmb22a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tpsmb22a.step` / `tpsmb22a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Littelfuse datasheet](docs/tpsmb22a-datasheet.pdf) (6 pp, sha256 `8cc50e1afb0bea8d`, retrieved 2026-10-31, 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/tpsmb22a-datasheet.pdf)