# GBU408A

**Yangzhou Yangjie Elec Tech** · Bridge Rectifiers · GBU

GBU408A from Yangzhou Yangjie Elec Tech, 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 | DC negative output terminal of the bridge, the leftmost lead marked '-' on the body. |
| 2 | AC1 | passive | AC input terminal, marked 'AC' on the body (second lead from the left). |
| 3 | AC2 | passive | AC input terminal, marked 'AC' on the body (third lead from the left). |
| 4 | + | passive | DC positive output terminal of the bridge, the rightmost lead marked '+' on the body. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| 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 |
|---|---|---|---|---|---|---|---|
| Repetitive peak reverse voltage | VRRM |  |  | 800 | V |  | 1 |
| Average rectified output current, with heatsink | IO |  |  | 4 | A | @60Hz sine wave, R-load, Tc=108℃ | 1 |
| Average rectified output current, without heatsink | IO |  |  | 2.3 | A | @60Hz sine wave, R-load, Ta=25℃ | 1 |
| Surge (non-repetitive) forward current | IFSM |  |  | 150 | A | @60Hz half sine wave, 1 cycle, Tj=25℃ | 1 |
| Current squared time, per diode | I2t |  |  | 93 | A2S | @1ms≤t≤8.3ms Tj=25℃, rating of per diode | 1 |
| Storage temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Junction temperature | Tj | -55 |  | 150 | ℃ |  | 1 |
| Dielectric strength, terminals to case | Vdis |  |  | 2.5 | KV | @terminals to case, AC 1 minute | 1 |
| Mounting torque | Tor |  |  | 8 | kg·cm | Recommended torque 5 kg·cm | 1 |
| Maximum instantaneous forward voltage drop per diode | VF |  |  | 1 | V | IFM=2.0A | 1 |
| Maximum DC reverse current at rated DC blocking voltage per diode | IRRM |  |  | 5 | μA | VRM=VRRM | 1 |
| Thermal resistance, junction to ambient, without heatsink | RθJ-A |  |  | 26 | ℃/W | Without heatsink | 2 |
| Thermal resistance, junction to case, with heatsink | RθJ-C |  |  | 5.5 | ℃/W | With heatsink | 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 | ● Terminals: Tin plated leads, solderable per J-STD-002 and JESD22-B102 | 1 |

## CAD (KiCad official)

- Symbol: `GBU408A`
- Footprint: `Diode_THT:Diode_Bridge_Vishay_GBU`
- 3D model: GBU (KiCad packages3D, STEP)
- 3D model files: `gbu408a-etched.step` / `gbu408a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `gbu408a.step` / `gbu408a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Yangzhou Yangjie Elec Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588897835932651520) (4 pp, sha256 `51185ed77a88145f`, 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/gbu408a-datasheet.pdf)