# GBU404

**Changjing** · Bridge Rectifiers · GBU

GBU404 from Changjing, 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 | Positive DC output of the bridge rectifier, the leftmost lead in the package drawing; average rectified output current is 4 A with heatsink at Tc=100°C (2.4 A without heatsink at Ta=100°C). |
| 2 | 2 | passive | AC input terminal of the bridge; VRRM is 400 V for GBU404 and maximum RMS voltage is 280 V. |
| 3 | 3 | passive | Second AC input terminal of the bridge; VRRM is 400 V for GBU404 and maximum RMS voltage is 280 V. |
| 4 | - | passive | Negative DC output of the bridge rectifier, the rightmost lead in the package drawing; non-repetitive surge forward current IFSM is 150 A (60 Hz half sine, 1 cycle, Tj=25°C). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| 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 |  |  | 400 | V |  | 1 |
| Maximum RMS Voltage | VRMS |  |  | 280 | V |  | 1 |
| Average Rectified Output Current | IO |  |  | 4 | A | 60Hz sine wave, R-load, with heatsink Tc=100℃ | 1 |
| Average Rectified Output Current | IO |  |  | 2.4 | A | 60Hz sine wave, R-load, without heatsink Ta=100℃ | 1 |
| Surge (Non-repetitive) Forward Current | IFSM |  |  | 150 | A | 60HZ sine wave, 1 cycle, Tj=25℃ | 1 |
| Current Squared Time | I2t |  |  | 93 | A2S | 1ms≤t<8.3ms, Tj=25℃, Rating of per diode | 1 |
| Peak Forward Voltage | VFM |  |  | 1 | V | IFM=2A, Pulse measurement, Rating of per diode | 1 |
| Peak Reverse Current | IRRM |  |  | 10 | μA | VRM=VRRM, Pulse measurement, Rating of per diode | 1 |
| Storage Temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Junction Temperature | Tj | -55 |  | 150 | ℃ |  | 1 |
| Dielectric Strength | Vdis |  |  | 2 | KV | Terminals to case, AC 1 minute | 1 |
| Mounting Torque | Tor |  | 5 | 8 | kg·cm | Recommend torque: 5kg·cm | 1 |
| Thermal Resistance, junction to ambient | RθJ-A |  |  | 23 | ℃/W | Between junction and ambient, Without heatsink | 1 |
| Thermal Resistance, junction to case | RθJ-C |  |  | 5.5 | ℃/W | Between junction and case, With heatsink | 1 |

## CAD (KiCad official)

- Symbol: `GBU404`
- Footprint: `Diode_THT:Diode_Bridge_Vishay_GBU`
- 3D model: GBU (KiCad packages3D, STEP)
- 3D model files: `gbu404-etched.step` / `gbu404-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `gbu404.step` / `gbu404.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603157374790352896) (3 pp, sha256 `9d3e7e5a40e803ad`, retrieved 2026-10-15, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/gbu404-datasheet.pdf)