# KBL408

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

KBL408 from Yangzhou Yangjie Elec Tech, in a KBL. 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 | + | power_out | Positive DC output of the bridge rectifier, shown as the first lead (+) in the schematic and marked on the body; average rectified output current is 4 A at Ta=40°C. |
| 2 | 2 | passive | AC input terminal; VRRM is 800 V for KBL408 and forward voltage is 1.05 V per diode at IFM=2A. |
| 3 | 3 | passive | Second AC input terminal; peak non-repetitive surge forward current is 120 A (60 Hz half-sine, 1 cycle, Ta=25°C). |
| 4 | - | power_in | Negative DC output (return) of the bridge rectifier, shown as the last lead (-) in the schematic and marked on the body. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| Package | KBL |
| 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 | IO |  |  | 4 | A | @60Hz sine wave, R-load, without heatsink, Ta=40℃ | 1 |
| Surge (Non-repetitive) Forward Current | IFSM |  |  | 120 | A | @60Hz half-sine wave, 1 cycle, Ta=25℃ | 1 |
| Current Squared Time (rating per diode) | I²t |  |  | 59.8 | A2S | @1ms≤t<8.3ms, Tj=25℃ | 1 |
| Storage Temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Junction Temperature | Tj | -55 |  | 150 | ℃ |  | 1 |
| Maximum instantaneous forward voltage drop per diode | VF |  |  | 1.05 | V | IFM=2A | 1 |
| Maximum DC reverse current at rated DC blocking voltage per diode | IRRM |  |  | 10 | μA | VRM=VRRM | 1 |
| Thermal resistance, junction to ambient | RθJ-A |  | 21 |  | ℃/W | Mounted on 3.0*3.0*0.11in (7.5*7.5*0.3cm) aluminum plate (note 1) | 2 |
| Thermal resistance, junction to lead | RθJ-L |  | 2.4 |  | ℃/W | Mounted on P.C.B. at 0.375in (9.5mm) lead length and 0.5*0.5in (12*12mm) copper pads (note 2) | 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: `KBL408`
- Footprint: `Diode_THT:Diode_Bridge_Vishay_KBL`
- 3D model: KBL (KiCad packages3D, STEP)
- 3D model files: `kbl408-etched.step` / `kbl408-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `kbl408.step` / `kbl408.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/8590166204368388096) (4 pp, sha256 `cc26328f4329bcc0`, retrieved 2026-10-16, 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/kbl408-datasheet.pdf)