# HER302

**LangJie** · Fast Recovery / High Efficiency Diodes · DO-27

HER302 from LangJie, in a DO-27. 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 | K | passive | Cathode: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | LangJie |
| Package | DO-27 |
| Category | Diodes |
| Pins | 2 |

## 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 Peak Reverse Voltage | VRRM |  |  | 100 | Volts |  | 1 |
| Maximum DC Blocking Voltage | VDC |  |  | 100 | Volts |  | 1 |
| Maximum RMS Voltage | VRMS |  |  | 70 | Volts |  | 1 |
| Maximum Average Forward Rectified Current | I(AV) |  |  | 3 | Amps | TA=75℃ | 1 |
| Peak Forward Surge Current | IFSM |  |  | 80 | Amps | 8.3mS single half sine-wave superimposed on rated load (JEDEC method) | 1 |
| Maximum DC Reverse Current at Rated DC Blocking Voltage | IR |  |  | 5 | µA | Rated DC blocking voltage, TA = 25℃ | 1 |
| Maximum DC Reverse Current at Rated DC Blocking Voltage | IR |  |  | 100 | µA | Rated DC blocking voltage, TA = 125℃ | 1 |
| Typical Thermal Resistance (junction to ambient) | RθJA |  |  | 30 | ℃/W | Junction to ambient, 0.375″(9.5mm) lead length, PCB mounted (Note 3) | 1 |
| Operating and Storage Temperature Range | TJ,TSTG | -55 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `HER302`
- Footprint: `Diode_THT:D_DO-27_P15.24mm_Horizontal`
- 3D model: DO-27 (KiCad packages3D, STEP)

## Provenance

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

- **Datasheet:** [LangJie datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590906790014513152) (5 pp, sha256 `270cb6491b01401c`, retrieved 2026-10-15, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `cathode-band convention` (convention), consensus `off` (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/her302-datasheet.pdf)