# GBU4K

**LRC** · Bridge Rectifiers · GBU

GBU4K from LRC, 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 of the bridge rectifier, marked '-' on the package body, left-most lead. |
| 2 | 2 | passive | AC input terminal, marked '~' on the package body, second lead from the negative end. |
| 3 | 3 | passive | AC input terminal, marked '~' on the package body, third lead from the negative end. |
| 4 | + | passive | DC positive output of the bridge rectifier, marked '+' on the package body, right-most lead. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | LRC |
| 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 repetitive voltage | VRRM |  |  | 800 | V |  | 1 |
| Maximum RMS voltage | VRMS |  |  | 560 | V |  | 1 |
| Maximum non-repetitive voltage | VDC |  |  | 880 | V |  | 1 |
| Maximum DC blocking voltage | VDC |  |  | 800 | V |  | 1 |
| Maximum DC reverse current | IR |  |  | 5 | µA | TA=25℃, at rated DC blocking voltage | 1 |
| Maximum DC reverse current | IR |  |  | 500 | µA | TA=125℃, at rated DC blocking voltage | 1 |
| Maximum average forward rectified output current | Io |  |  | 4 | A | Tc=100℃(1); unites mounted on P.C.B. without heat-sink Ta=40℃(2) | 1 |
| Peak forward surge current | IFSM |  |  | 150 | A | 8.3ms single half sine-wave superimposed on rated load | 1 |
| Rating of fusing | I2t |  |  | 93 | A2sec | t<8.3ms | 1 |
| Dielectric strength terminals to case | Vdia |  |  | 2.5 | KV | AC 1 minute, current 1mA | 1 |
| Max instantaneous forward voltage | VF |  |  | 1.05 | V | at 2.0A | 1 |
| Thermal resistance junction to ambient | RθJA |  |  | 22 | ℃/W | Maximum thermal resistance per leg on P.C.B. without heat-sink | 1 |
| Thermal resistance junction to case | RθJC |  |  | 3.5 | ℃/W | Per leg on Al plate heat-sink | 1 |
| Operating junction temperature | TJ | -55 |  | 150 | ℃ |  | 1 |
| Storage temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Mounting torque rating | Tor |  |  | 0.8 | N.m | Rating torque | 1 |
| Mounting torque suggested range | Tor | 0.45 |  | 0.65 | N.m | Suggested | 1 |

## CAD (KiCad official)

- Symbol: `GBU4K`
- Footprint: `Diode_THT:Diode_Bridge_Vishay_GBU`
- 3D model: GBU (KiCad packages3D, STEP)
- 3D model files: `gbu4k-etched.step` / `gbu4k-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `gbu4k.step` / `gbu4k.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [LRC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590221618129121280) (3 pp, sha256 `fe1a926b1b4e8299`, 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/gbu4k-datasheet.pdf)