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A small outline transistor (SOT) is a small footprint, discrete surface mount transistor commonly used in consumer electronics.
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SOT23-3, SOT323, SOT416
The SOT23-3 package is very popular and a common package for transistors, and is also used for diodes and voltage regulators.
SOT89-3
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.
SOT89-5
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.
SOT223-4
The SOT223-4 package is a popular package for voltage regulators.
SOT223-5
The SOT223-5 package is a popular package for voltage regulators.