SMF Component Package

Authors:

Geoffrey Hunter

Published On:

Apr 17, 2024

Last Updated:

Apr 17, 2024

3D render of the SMF (DO-219AB) package from DigiKey¹.

SMF (also commonly known as DO-219AB²) is a 2-lead SMD package commonly used for diodes. Vishay seems to be the main manufacturer that uses this package.

Synonyms

DO-219AB: This is the JEDEC name for the SMF package.
SMF: This is the name used by Vishay for this package.

Dimensions

The dimensions of the SMF package from Vishay are shown below:

SMF (DO-219AB) package dimensions from Vishay².

The key dimensions from this diagram are (typical):

Length: 3.7mm
Width: 1.8mm
Height: 1.0mm

Recommended Land Pattern

Recommended land pattern for the SMF (DO-219AB) package from Vishay².

The outer bounding box of both the package and the land pattern are:

Length: $4.2mm$
Width: $1.8mm$

This gives a land area of $7.56mm^2$ .

Thermal Resistance

The thermal resistance of the SMF package is $R_{\theta JA} = 180\,^{\circ}\text{C/W}$ (junction to ambient) when mounted on a standard PCB with 3x3mm copper pads than are $\ge 40um$ thick².

Common Uses

Schottky and zener diodes from Vishay.

DigiKey. SMF24A-E3-08 [product page]. Retrieved 2024-04-17, from https://www.digikey.com/en/products/detail/vishay-general-semiconductor-diodes-division/SMF24A-E3-08/1680581. ↩
Vishay (2022, Dec 15). BZD17 Series - Zener Diodes [datasheet]. Retrieved 2024-04-17, from https://www.vishay.com/docs/85161/bzd17series.pdf. ↩ ↩² ↩³ ↩⁴