Editing: SOT-23-3

Field: AI Skill Technical Reference

# SOT-23-3

**Package:** SOT-23-3
**Library:** Package_TO_SOT_SMD
**Category:** Transistor / Small Signal
**Pads:** 3
**Pitch:** 0.95mm
**Body Size:** 2.9 x 1.3mm
**Mounting:** Surface Mount

## Description

The SOT-23-3 is the most widely used surface-mount transistor package in the world. With just three pins at 0.95mm pitch and a tiny 2.9 x 1.3mm body, it houses MOSFETs, BJTs, voltage references, small LDO regulators, and single-gate logic ICs. Its compact size and excellent thermal performance make it the go-to package for space-constrained designs, from smartphones to industrial controllers.

## Usage Notes

- Designed for reflow soldering (paste stencil recommended)
- Pad size optimized for 0.95mm 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-23-3`

To use in your project:
1. Open the Footprint Library Manager in KiCad
2. Search for `SOT-23-3`
3. Assign to your schematic symbol in the Symbol Properties dialog

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