# SZP6SMB27AT3G

**Littelfuse** · ESD And Surge Protection (TVS/ESD) · SMB

SZP6SMB27AT3G from Littelfuse, in a SMB. 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 uni-directional TVS, identified by the color band on the package and the cathode mark on the tape cover. |
| 2 | Anode | passive | Anode terminal of the uni-directional TVS, the terminal opposite the cathode band, used for the forward (clamping) path. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | SMB |
| 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 (uni-directional, 27 V type) | VBR | 25.7 | 27.05 | 28.4 | Volts | @ IT = 1 mA (Note 7), TA = 25°C | 3 |
| Maximum Reverse Leakage Current | IR |  |  | 5 | µA | @ VRWM | 3 |
| Forward Voltage (uni-directional) | VF |  |  | 3.5 | V | @ IF = 30 A (Note 5) | 2 |
| Peak Power Dissipation | PPK |  |  | 600 | W | TL = 25°C, Pulse Width = 1 ms (Note 1), 10/1000 µs, non-repetitive | 1 |
| DC Power Dissipation (measured zero lead length) | PD |  |  | 3 | W | @ TL = 75°C (Note 2) | 1 |
| DC Power Dissipation | PD |  |  | 0.55 | W | @ TA = 25°C (Note 3) | 1 |
| Forward Surge Current | IFSM |  |  | 100 | A | @ TA = 25°C, 1/2 sine wave, PW = 8.3 ms (Note 4), uni-directional only | 1 |
| Operating and Storage Temperature Range | TJ, Tstg | -65 |  | 150 | °C |  | 1 |
| Working Peak Reverse Voltage | VRWM |  | 23.1 |  | V |  | 3 |
| Clamping Voltage | VC |  | 37.5 |  | Volts | @ IPP = 16 A (Note 8) | 3 |
| Breakdown Voltage Temperature Coefficient | αVBR |  | 0.096 |  | %/°C |  | 3 |
| Typical Junction Capacitance | C |  | 700 |  | pF | Bias Voltage = 0 V, F = 1 MHz, TJ = 25°C (Note 9) | 3 |
| Thermal Resistance from Junction-to-Lead | RθJL |  | 25 |  | °C/W | Measured zero lead length (Note 2) | 1 |
| DC Power Derating Above 75°C |  |  | 40 |  | mW/°C | Derate above TL = 75°C | 1 |
| Thermal Resistance from Junction-to-Ambient | RθJA |  | 226 |  | °C/W | FR-4 board, Littelfuse minimum recommended footprint (Note 3) | 1 |
| DC Power Derating Above 25°C |  |  | 4.4 |  | mW/°C | Derate above TA = 25°C | 1 |

## CAD (KiCad official)

- Symbol: `SZP6SMB27AT3G`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: SMB (KiCad packages3D, STEP)
- 3D model files: `szp6smb27at3g-etched.step` / `szp6smb27at3g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `szp6smb27at3g.step` / `szp6smb27at3g.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/8588922214120886272) (7 pp, sha256 `baf561fbcd6cd66c`, retrieved 2026-10-15, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-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/szp6smb27at3g-datasheet.pdf)