# GBU1508

**Changjing** · Bridge Rectifiers · GBU

GBU1508 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 terminal of the bridge, marked + on the package outline (leftmost lead); rectifier rated Io 15A with heatsink at Tc=100°C. |
| 2 | AC1 | passive | AC input terminal (inner lead); VRRM up to 1000V depending on suffix (GBU1508: 800V), VRMS 560V for the 08 grade. |
| 3 | AC2 | passive | AC input terminal (inner lead); VRRM up to 1000V depending on suffix (GBU1508: 800V), VRMS 560V for the 08 grade. |
| 4 | - | passive | Negative DC output terminal of the bridge, marked - on the package outline (rightmost lead). |

## 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 |  |  | 800 | V |  | 1 |
| Average Rectified Output Current (with heatsink) | IO |  |  | 15 | A | 60Hz sine wave, R-load, Tc=100℃ | 1 |
| Average Rectified Output Current (without heatsink) | IO |  |  | 3.2 | A | 60Hz sine wave, R-load, Ta=25℃ | 1 |
| Surge (Non-repetitive) Forward Current | IFSM |  |  | 240 | A | 60Hz sine wave, 1 cycle, Tj=25℃ | 1 |
| Current Squared Time | I2t |  |  | 239 | A2S | 1ms≤t<8.3ms, Tj=25℃, rating per diode | 1 |
| Peak Forward Voltage | VFM |  |  | 1 | V | IFM=7.5A, pulse measurement, rating per diode | 1 |
| Peak Reverse Current | IRRM |  |  | 10 | μA | VRM=VRRM, pulse measurement, rating 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 | Recommended torque | 1 |
| Thermal Resistance, junction to ambient | RθJ-A |  |  | 23 | ℃/W | Between junction and ambient, without heatsink | 1 |
| Thermal Resistance, junction to case | RθJ-C |  |  | 1.8 | ℃/W | Between junction and case, with heatsink | 1 |
| Maximum RMS Voltage | VRMS |  |  | 560 | V |  | 1 |

## CAD (KiCad official)

- Symbol: `GBU1508`
- Footprint: `Diode_THT:Diode_Bridge_Vishay_GBU`
- 3D model: GBU (KiCad packages3D, STEP)
- 3D model files: `gbu1508-etched.step` / `gbu1508-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `gbu1508.step` / `gbu1508.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/8603165012164816896) (3 pp, sha256 `ec5db6ea9cabdbc2`, 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/gbu1508-datasheet.pdf)