# TPSMB68CA

**Littelfuse** · ESD And Surge Protection (TVS/ESD) · DO-214AA(SMBJ)

TPSMB68CA 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 | Terminal 1 | passive | Bi-directional TVS terminal with no polarity (TPSMB68CA, VBR 64.60-71.40V at 1mA, VR 58.1V, max clamping 92.0V at 6.6A Ipp), interchangeable with the other terminal. |
| 2 | Terminal 2 | passive | Bi-directional TVS terminal with no polarity (TPSMB68CA, VBR 64.60-71.40V at 1mA, VR 58.1V, max clamping 92.0V at 6.6A Ipp), interchangeable with the other terminal. |

## 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 |
|---|---|---|---|---|---|---|---|
| Breakdown voltage (bidirectional TPSMB68CA), minimum | VBR | 64.6 |  |  | V | IT = 1 mA | 2 |
| Breakdown voltage (bidirectional TPSMB68CA), maximum | VBR |  |  | 71.4 | V | IT = 1 mA | 2 |
| Maximum clamping voltage | VC |  |  | 92 | V | Ipp = 6.6 A | 2 |
| Maximum peak pulse current | Ipp |  |  | 6.6 | A |  | 2 |
| Maximum reverse leakage current | IR |  |  | 1 | µA | VR = 58.10 V | 2 |
| Typical reverse leakage current at 150°C | IR |  | 8 |  | µA | 150°C | 2 |
| Maximum temperature coefficient of VBR |  |  |  | 0.103 | %/C |  | 2 |
| Reverse stand-off voltage | VR |  | 58.1 |  | V |  | 2 |
| Peak pulse power dissipation | PPPM |  |  | 600 | W | 10/1000µs waveform (Fig.1), Notes 1 and 2 | 1 |
| Power dissipation on infinite heat sink | PM(AV) |  |  | 5 | W | TL = 50°C | 1 |
| Operating junction temperature range (VBR ≤ 91V) | 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 |

## 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: `TPSMB68CA`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: DO-214AA(SMBJ) (KiCad packages3D, STEP)
- 3D model files: `tpsmb68ca-etched.step` / `tpsmb68ca-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tpsmb68ca.step` / `tpsmb68ca.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Littelfuse datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590438154857066496) (6 pp, sha256 `8cc50e1afb0bea8d`, retrieved 2026-10-20, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/tpsmb68ca-datasheet.pdf)