# 1N5408

**Diodes Incorporated** · Rectifier Diode · DO-201AD

The 1N5408 is a 3 A general-purpose rectifier rated to 1000 V reverse voltage, part of the 1N5400 glass-passivated series. Its axial DO-201AD package suits through-hole power supplies, freewheeling, and general rectification where high reverse voltage is needed.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | K | passive | Cathode terminal of the rectifier diode, identified by the printed band on the DO-201AD case. Blocks reverse current up to VRRM = 1000V for the 1N5408G variant. |
| 2 | A | passive | Anode terminal of the rectifier diode. Conventional forward current flows from anode to cathode when VF > ~0.7V (typ 1.1V at IF = 3.0A). |

## Key specifications

| Parameter | Value |
|---|---|
| Type | General-purpose rectifier |
| Average forward current (IO) | 3 A |
| Peak repetitive reverse voltage (VRRM) | 1000 V |
| Forward voltage (VF) | 1.0 V at 3 A |
| Peak surge current (IFSM) | 200 A |
| Reverse recovery | Standard (not fast) |
| Operating temperature | -65 C to 150 C |

## Ordering variants

- `1N5408G-B`
- `1N5408G-T`

## CAD (KiCad official)

- Symbol: `1n5408.kicad_sym`
- Footprint: `1n5408.kicad_mod`
- 3D model: Axial DO-201AD body from KiCad `Diode_THT/D_DO-201AD_P15.24mm_Horizontal`.

## Provenance

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

- **Datasheet:** [Diodes Incorporated datasheet](https://www.diodes.com/datasheet/download/1N5400G.pdf) (3 pp, sha256 `a8a9a95573279586`, retrieved 2026-08-17, tier: manufacturer)
- **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/1n5408-datasheet.pdf)