Small outline transistor (SOT) packages have certain numbers which tell the package size, for example, SOT23 or SOT323. But what is the meaning of suffix 23 or 323?
Electronic – the significance of numbers (2,3) mentioned in SOT23
packagessemiconductors
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Best Answer
While some packages do have numbers that mean something, the TO, DO, and SOT series are simply serial. SOT-23 is just package number 23 in the JEDEC SOT specifications. There's no significance to the numbers beyond that.
You may occasionally see SOT-23-3 or SOT-23-5 or SOT-23-6; these do have significance, as the last digit is the number of pins on the package. Sometimes SOT-23-5 gets referred to as SOT-25, as well, but this is generally considered incorrect. Similarly for SOT-23-6 being called SOT-26.