A small outline transistor (SOT) is a family of small footprint, discrete surface mounttransistor commonly used in consumer electronics. The most common SOT are SOT23 variations,. SOT23-3 differs from SOT23 in a wider body of 1.6mm instead on 1.3mm, also manufacturers offer the nearly identical thin small outline transistor (TSOT) package, where lower height is important.
SOT23, SOT323, SOT416
The SOT23 package is very popular and a common package for transistors, and is also used for diodes and voltage regulators.
The SOT89-3 electrically only has three leads (contact/pin). The wide lead (tab) is physically part of the middle lead on the other side of the package. Some call this package a SOT89-4, since it visually appears to have four leads when looking down at the part.
The SOT89-5 electrically only has five leads (contact/pin). The middle lead is physically part of the middle lead on the other side of the package. Some call this package a SOT89-6, since it visually appears to have six leads when looking down at the part.
The SOT223-4 package is a popular package for voltage regulators. It was introduced by Philips.