# GBU408

**LGE** · Bridge Rectifiers · GBU

GBU408 from LGE, in a GBU. 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 | - | passive | Negative DC output terminal of the bridge rectifier (leftmost lead in the package drawing); GBU408 is rated 800 V VRRM and 4.0 A average output current at TC=100°C. |
| 2 | AC | passive | AC input terminal of the bridge rectifier; GBU408 is rated 560 V RMS maximum. |
| 3 | AC | passive | AC input terminal of the bridge rectifier; GBU408 is rated 560 V RMS maximum. |
| 4 | + | passive | Positive DC output terminal of the bridge rectifier (rightmost lead in the package drawing); peak forward surge current is 150.0 A for 8.3 ms. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | LGE |
| Package | GBU |
| Category | Diodes |
| Pins | 4 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Maximum recurrent peak reverse voltage | VRRM |  |  | 800 | V |  | 1 |
| Maximum RMS voltage | VRMS |  |  | 560 | V |  | 1 |
| Maximum DC blocking voltage | VDC |  |  | 800 | V |  | 1 |
| Maximum average forward output current | IF(AV) |  |  | 4 | A | @TC=100℃ (note1) | 1 |
| Peak forward surge current | IFSM |  |  | 150 | A | 8.3ms single half-sine-wave superimposed on rated load | 1 |
| Operating junction temperature range | TJ | -55 |  | 150 | ℃ |  | 1 |
| Storage temperature range | TSTG | -55 |  | 150 | ℃ |  | 1 |
| Maximum instantaneous forward voltage | VF |  |  | 1 | V | @2.0A; @4.0A | 1 |
| Maximum reverse current at rated DC blocking voltage | IR |  |  | 5 | μA | @TA=25℃ | 1 |
| Maximum reverse current at rated DC blocking voltage | IR |  |  | 50 | μA | @TA=125℃ | 1 |
| I²t rating for fusing | I²t |  |  | 93 | A²S | @Tj=25℃ | 1 |
| Typical junction capacitance per element | CJ |  | 45 |  | pF | Measured at 1.0 MHz and applied reverse voltage of 4.0 volts (note 3) | 1 |
| Typical thermal resistance, junction to ambient | RθJA |  | 22 |  | ℃/W | Units mounted on P.C.B. with 0.5x0.5in (12x12mm) copper pads and 0.375in (9.5mm) lead length (note 2) | 1 |
| Typical thermal resistance, junction to case | RθJC |  | 4 |  | ℃/W | Unit case mounted on 1.6x1.6x0.06in (4.0x4.0x0.15cm) Al. plate (note 1) | 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 | copper |  | 2. Units mounted on P.C.B. with 0.5x0.5" (12x12mm) copper pads and 0.375" (9.5mm) lead length. | 1 |

## CAD (KiCad official)

- Symbol: `GBU408`
- Footprint: `Diode_THT:Diode_Bridge_Vishay_GBU`
- 3D model: GBU (KiCad packages3D, STEP)
- 3D model files: `gbu408-etched.step` / `gbu408-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `gbu408.step` / `gbu408.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [LGE datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8602996719278051328) (3 pp, sha256 `2f5ef596b5a7e13d`, retrieved 2026-10-21, 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/gbu408-datasheet.pdf)