SMF Component Package

Overview

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:

The key dimensions from this diagram are (typical):

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

Recommended Land Pattern

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.

References