Skip to main content

SMF Component Package

Geoffrey Hunter
Geoffrey Hunter
mbedded.ninja Author

Overview​

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

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

  • Length: 4.2mm4.2mm
  • Width: 1.8mm1.8mm

This gives a land area of 7.56mm27.56mm^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 ≥40um\ge 40um thick2.

Common Uses​

  • Schottky and zener diodes from Vishay.

Footnotes​

  1. 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. ↩

  2. 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