SOT-89 COMPONENT PACKAGE
SOT-89 Component Package
| Date Published: | |
| Last Modified: |
Overview
SOT-89 is a small, SMD family of component packages. There are two variants within the family, the SOT-89-3 (with three leads, one of which is more like a tab), and the SOT-89-5 (with 5 leads, again – one of which is more like a tab).
All packages in this family have a number of rectangular leads and a central single tab-shaped lead. The tab-shaped lead improves the thermal performance of the package (decreases it’s thermal resistance).
SOT-89-3
SOT-89-3 (Small Outline Transistor 89)
Synonyms:
Similar To:
SOT-89-6
Mounting: SMD
Pin Count: 3 (incl. tab-like lead)
Pitch: 1.50mm (between lead centers on the same side)2
Solderability: The package is relatively easy to solder by hand. There are no issues with hand soldering the tab since the tab produces on one side of the package.
Package Dimensions:
Common Uses:
- BJTs1
Dimensions
![Dimensions of the SOT-89-3 component package[^bib-diodes-sot89].](https://blog.mbedded.ninja/pcb-design/component-packages/sot-89-component-package/sot-89-3-package-dimensions-diodes-inc.png)
Dimensions of the SOT-89-3 component package3.
SOT-89-5
The SOT-89-5 package is commonly used as a SMD replacement for the SIP-4 TH package. It call also be called the SOT-89-6, since it appears to have 6 leads when look down on the package.
A 3D render of the SOT-89 (SC-62, TO-243) component package. Image from http://www.digikey.com/.
Dimensions
Thermal Resistance
www.diodes.com states their SOT-89-5 component package to have:
\begin{align} \theta_{JA} = 168^{\circ}C/W \end{align}
\begin{align} \theta_{JC} = 36^{\circ}C/W $$
References
Toshiba (2013, Nov 01). 2SC2873: TOSHIBA Transistor Silicon NPN Epitaxial Type (PCT Process) (datasheet). Retrieved 2022-04-04, from https://www.mouser.com/datasheet/2/408/2SC2873_datasheet_en_20131101-1649836.pdf. ↩︎ ↩︎ ↩︎
NXP (2016, Feb 8). SOT89: plastic surface-mounted package; die pad for good heat transfer; 3 leads (package information). Retrieved 2022-04-04 from https://www.nxp.com/docs/en/package-information/SOT89.pdf. ↩︎ ↩︎ ↩︎ ↩︎ ↩︎ ↩︎
Retrieved 2022-04-03, from https://www.diodes.com/assets/Package-Files/SOT89.pdf. ↩︎
