SOT-89 COMPONENT PACKAGE

SOT-89 Component Package

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Date Published:	November 11, 2015
Last Modified:	April 4, 2022

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

sot 89 sc62 to 243 component package 3d render

Synonyms

2-5K1A (Toshiba)[2]
SC-62 (JEITA)[2][3]
TO-243 (JEDEC)[3]

Similar To

SOT-89-6

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

Length: 4.5mm (nom)[3]
Width: 2.5mm (nom)[3]
Height: 1.5mm (nom)[3]

Typical PCB Land Area

3D Models

Common Uses

BJTs[2]

2.1. Dimensions

Figure 1. Dimensions of the SOT-89-3 component package[1].

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.

Figure 2. A 3D render of the SOT-89 (SC-62, TO-243) component package. Image from http://www.digikey.com/.

3.1. Dimensions

sot 89 sc62 to 243 component package dimensions.jpg

Figure 3. The dimensions for the SOT-89-5 (SC-62, TO-243) component package.

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

Geoffrey Hunter

Dude making stuff.

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This work is licensed under a Creative Commons Attribution 4.0 International License .