# DO-214 diode package

Surface-mount diode packages DO-214AC (SMA), DO-214AA (SMB) and DO-214AB (SMC), as Vishay draws them. The package is centred on the origin with the seating plane on the XY plane and its length along X. It is the moulded body, the cathode band on top at the -X end, and a J-bend lead at each end. Each lead leaves the body's end, runs down the outside and tucks under the body. Each lead is its own solid.

## Source

Vishay Semiconductors outline drawings, "DIMENSIONS in inches (millimeters)", revision 09-Jul-10:

- SMA, DO-214AC: document number 95400, <https://www.vishay.com/docs/95400/sma.pdf>, page 1.
- SMB, DO-214AA: document number 95401, <https://www.vishay.com/docs/95401/smb.pdf>, page 1.
- SMC, DO-214AB: document number 95402, <https://www.vishay.com/docs/95402/smc.pdf>, page 1.

| Package | Body length | Body width | Lead width | Height | Lead thickness | Foot under the body | Over the leads | Standoff |
|---|---|---|---|---|---|---|---|---|
| SMA | 3.99–4.50 | 2.54–2.79 | 1.25–1.65 | 1.98–2.29 | 0.152–0.305 | 0.76–1.52 | 4.93–5.28 | 0–0.203 |
| SMB | 4.06–4.57 | 3.30–3.94 | 1.95–2.20 | 2.13–2.44 | 0.152–0.305 | 0.76–1.52 | 5.21–5.59 | 0–0.2 |
| SMC | 6.60–7.11 | 5.59–6.22 | 2.90–3.20 | 2.06–2.62 | 0.152–0.305 | 0.76–1.52 | 7.75–8.13 | 0–0.2 |

The model uses the middle of each range.

**Proportions, stated plainly.** The drawings show these but don't dimension them:

- The lead leaves the body at half its height, and runs 0.3 into the body. Its foot sits in a recess in the body's underside, so no solids overlap.
- The cathode band is 0.12 of the body's length wide, 0.1 of the length in from the -X end, and 0.03 proud of the top. The drawings mark the band but don't dimension it.
- The body is a plain block; the drawn draft of the moulding's top isn't modelled.

**Materials**, for looks and a rough mass. The moulding is epoxy compound, mostly silica filler (density about 1.9 to 2.0), and ptfe (2.07) is the nearest in the material list. The leads are tin-plated copper, shown as copper. The model weighs about 63 mg (SMA), 94 mg (SMB) and 222 mg (SMC). The outline drawings give no weight, so there is nothing to check this against.

## Catalogue models

The old catalogue's `D_SMA`, `D_SMB` and `D_SMC` entries have no models to measure. Each names the JEDEC package (SMA is DO-214AC, SMB DO-214AA and SMC DO-214AB), and each maps to Vishay's outline of that package.

The other surface-mount diode packages in the family (SOD, MELF, PowerDI and the others) aren't read yet; see `COVERAGE.md`.