Small-outline transistor

A small outline transistor (SOT) is a family of small footprint, discrete surface mount transistor commonly used in consumer electronics.

Also, manufacturers offer the nearly identical thin small outline transistor (TSOT/TSOP) package, where lower height is important.

[1] 1.75 SOT54 is an alternate designation for the JEDEC TO-92 package.

Some call this package a SOT89-4, since it visually appears to have four leads when looking down at the part.

Some call this package a SOT89-6, since it visually appears to have six leads when looking down at the part.