SOT-89 COMPONENT PACKAGE
SOT-89 Component Package
Date Published: | |
Last Modified: |
Contents
1. Overview
SOT-89
is a small, surface-mount family of similar 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).
2. SOT-89-3
Name | SOT-89-3 (Small Outline Transistor 89) |
Image | |
Synonyms | |
Similar To |
|
Mounting | SMD |
Pin Count | 3 (incl. tab-like lead) |
Pitch | 1.50mm (between lead centers on the same side)[3] |
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. |
Thermal Resistance | |
Package Dimensions | |
Typical PCB Land Area | |
3D Models | - |
Common Uses |
|
2.1. Dimensions
3. 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.

3.1. Dimensions

3.2. Thermal Resistance
www.diodes.com states their SOT-89-5 component package to have:
<div> \theta_{JA} = 168^{\circ}C/W </div>
<div> \theta_{JC} = 36^{\circ}C/W </div>
References
[1] Retrieved 2022-04-03, from https://www.diodes.com/assets/Package-Files/SOT89.pdf.
[2] 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.
[3] 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.
Authors

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