Transistor packages

SOT-23 - Small Outline Transistor. This is SMT package has three terminals for a diode of transistor, bit it can have more pins when it may be used for small integrated circuits such as an operational amplifier, etc. It measures 3 mm x 1.75 mm x 1.3 mm

SOT-223 - Small Outline Transistor. This package is used for higher power devices. It measures 6.7 mm x 3.7 mm x 1.8 mm. There are generally four terminals, one of which is a large heat-transfer pad.

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