# MUR3040DT

**YFW** · Fast Recovery / High Efficiency Diodes · TO-220AB

MUR3040DT from YFW, in a TO-220AB. 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 | PIN1 | passive | Diode terminal of one leg of the common-cathode pair; the datasheet's pinout figure labels it PIN 1 but does not state its function, and the device is rated 400 V repetitive reverse voltage with 30 A average forward current. |
| 2 | PIN2 (case) | passive | Common cathode shared by both diode legs and electrically connected to the mounting tab (case); junction-to-case thermal resistance is 2.5 °C/W typical. |
| 3 | PIN3 | passive | Diode terminal of the other leg of the common-cathode pair; the datasheet's pinout figure labels it PIN 3 but does not state its function, and the device is rated 400 V repetitive reverse voltage with 30 A average forward current. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | YFW |
| Package | TO-220AB |
| Category | Diodes |
| Pins | 3 |

## 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 reverse voltage | VRRM |  |  | 400 | V |  | 1 |
| Maximum RMS voltage | VRMS |  |  | 280 | V |  | 1 |
| Maximum DC blocking voltage | VDC |  |  | 400 | V |  | 1 |
| Maximum average forward current | IAV |  |  | 30 | A |  | 1 |
| Peak forward surge current | IFSM |  |  | 400 | A | 8.3ms single half sine-wave superimposed on rated load | 1 |
| Operation Junction Temperature and Storage Temperature | TJ，TSTG | -55 |  | 150 | °C |  | 1 |
| Maximum average reverse current | IR |  |  | 5 | μA | TJ=25°C, at rated DC blocking voltage | 1 |
| Maximum average reverse current | IR |  |  | 250 | μA | TJ=125°C, at rated DC blocking voltage | 1 |
| Typical forward voltage per leg | VF |  | 1.35 |  | V | at 15A | 1 |
| Typical reverse recovery time | TRR |  | 35 |  | nS | IF=0.5A, IR=1.0A, IRR=0.25A | 1 |
| Typical thermal resistance per diode | Rθ-JC |  | 2.5 |  | ℃/W | Junction to case | 1 |

## CAD (KiCad official)

- Symbol: `MUR3040DT`
- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`
- 3D model: TO-220AB (KiCad packages3D, STEP)
- 3D model files: `mur3040dt-etched.step` / `mur3040dt-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mur3040dt.step` / `mur3040dt.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [YFW datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603060867894697984) (3 pp, sha256 `c9fccc5ddb58af1c`, 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/mur3040dt-datasheet.pdf)