# HER308-B

**GOODWORK** · High Effic Rectifier · DO-27

HER308-B from GOODWORK, 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 end of the axial rectifier, marked by the color band; the datasheet states 'Polarity: Color band denotes cathode end'. |
| 2 | A | passive | Anode lead of the axial rectifier (opposite end from the color band); HER308 is rated 1000 V DC blocking voltage and 3.0 A average forward current. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | GOODWORK |
| 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 Recurrent Peak Reverse Voltage | VRRM |  |  | 1000 | V |  | 1 |
| Maximum RMS Voltage | VRMS |  |  | 700 | V |  | 1 |
| Maximum DC Blocking Voltage | VDC |  |  | 1000 | V |  | 1 |
| Maximum Average Forward Rectified Current | IF(AV) |  |  | 3 | A |  | 1 |
| Peak Forward Surge Current | IFSM |  |  | 125 | A | 8.3 ms single half sine-wave superimposed on rated load (JEDEC method) | 1 |
| Maximum Instantaneous Forward Voltage | VF |  |  | 1.85 | V | at 3.0A | 1 |
| Maximum DC Reverse Current | IR |  |  | 5 | µA | Ta=25 C at Rated DC Blocking Voltage | 1 |
| Maximum DC Reverse Current | IR |  |  | 200 | µA | Ta=100 C at Rated DC Blocking Voltage | 1 |
| Operating and Storage Temperature Range | TJ, TSTG | -65 |  | 150 | C |  | 1 |

## CAD (KiCad official)

- Symbol: `HER308-B`
- 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:** [GOODWORK datasheet](docs/her308-b-datasheet.pdf) (3 pp, sha256 `e36f2611f17799c3`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text), consensus `claude-sonnet-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/her308-b-datasheet.pdf)