# KBU804

**Changjing** · Bridge Rectifiers · KBU

KBU804 from Changjing, in a KBU. 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 | + | output | Positive DC output of the bridge rectifier; average rectified output current up to 8A (60Hz sine, R-load, Tc=100°C). |
| 2 | 2 | passive | AC input; VRRM 400V for KBU804, surge forward current IFSM 200A (60Hz sine, 1 cycle, Tj=25°C). |
| 3 | 3 | passive | Second AC input; VRRM 400V for KBU804, peak forward voltage 1.0V max per diode at IFM=4.0A. |
| 4 | - | output | Negative DC output of the bridge rectifier (return); peak reverse current 10µA max per diode at VRM=VRRM. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | KBU |
| 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 |
|---|---|---|---|---|---|---|---|
| Peak Forward Voltage | VFM |  |  | 1 | V | IFM=4.0A, Pulse measurement, Rating of per diode | 1 |
| Peak Reverse Current | IRRM |  |  | 10 | μA | VRM=VRRM, Pulse measurement, Rating of per diode | 1 |
| Repetitive Peak Reverse Voltage | VRRM |  |  | 400 | V | KBU804 (04 column) | 1 |
| Average Rectified Output Current | IO |  |  | 8 | A | 60Hz sine wave, R-load Tc=100℃ | 1 |
| Surge (Non-repetitive) Forward Current | IFSM |  |  | 200 | 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 |
| Storage Temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Junction Temperature | Tj | -55 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `KBU804`
- Footprint: `Diode_THT:Diode_Bridge_Vishay_KBU`
- 3D model: KBU (KiCad packages3D, STEP)
- 3D model files: `kbu804-etched.step` / `kbu804-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `kbu804.step` / `kbu804.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](docs/kbu804-datasheet.pdf) (3 pp, sha256 `7786994fb3f31bbd`, retrieved 2026-10-22, 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/kbu804-datasheet.pdf)