Footprint

SOT-89-3

Medium-power SMD transistor package — better thermal than SOT-23, smaller than SOT-223

⚡ Install this footprint

Paste this into Claude Code (VS Code panel, Adom editor, or terminal) to install:

Search the Adom Wiki for the footprint "SOT-89-3" (slug: sot-89-3) at https://wiki-ufypy5dpx93o.adom.cloud/wiki/footprints/sot-89-3. Download the .kicad_mod file and any .glb 3D model from the wiki page's static assets. Add the footprint to my current KiCad project's footprints/ directory and register in fp-lib-table.
Category Transistor / Power
Library Package_TO_SOT_SMD
Footprint SOT-89-3
Pads 3
Pitch 1.50mm
Body Size 4.5 x 2.5mm
Mounting Surface Mount
Footprint
3D Model

AI Skill Technical Reference

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SOT-89-3

Package: SOT-89-3 Library: Package_TO_SOT_SMD Category: Transistor / Power Pads: 3 Pitch: 1.50mm Body Size: 4.5 x 2.5mm Mounting: Surface Mount

Description

The SOT-89-3 fills the gap between the tiny SOT-23 and the larger SOT-223 in the power dissipation hierarchy. With a 4.5 x 2.5mm body and a large collector/drain tab extending under the package, it handles 0.5-1W without a heatsink. Used for medium-power transistors, small LDO regulators (HT7333), RF amplifiers, and voltage references. The extended tab provides better thermal coupling to the PCB than SOT-23 while taking less space than SOT-223. A sweet spot for designs needing moderate power handling.

Usage Notes

  • Designed for reflow soldering (paste stencil recommended)
  • Pad size optimized for 1.50mm pitch components
  • Follow IPC-7351 land pattern guidelines

KiCad Library Reference

This footprint is from the official KiCad Package_TO_SOT_SMD library. Full identifier: Package_TO_SOT_SMD:SOT-89-3

To use in your project:

  1. Open the Footprint Library Manager in KiCad
  2. Search for SOT-89-3
  3. Assign to your schematic symbol in the Symbol Properties dialog

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0 revisions · KiCad Library: Package_TO_SOT_SMD:SOT-89-3 · Updated 2026-03-02 17:31:36