SOT-323 COMPONENT PACKAGE

SOT-323 Component Package

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Date Published:	November 9, 2014
Last Modified:	October 19, 2020

Overview

Name	SOT-323 (Small Outline Transistor 323)
Synonyms	SC-70 (SOT323-3, JEITA) SCx (Analog Devices) SMini3-G1-B (SOT323-3, Panasonic)
Variants	SOT-323-3 (3 lead) SOT-323-5 (5 lead) SOT-323-8 (8 lead)
Similar To	SOT-363
Mounting	SMD
Pin Count	3 (SOT-323-3) 5 (SOT-323-5) 8 (SOT-323-8, SC8)
Pitch	0.50mm (SOT-323-8, SC8) 0.65mm (all other variants)
Solderability	Difficult to solder by hand (but possible).
Thermal Resistance	SOT-323-3: \( T_{ja} = 380°C/W \) (mounted on 10x8x0.6mm FR4, still air) \( T_{jc} = 60°C/W \) SOT-323-8 \( T_{ja} = 70-90°C/W \)
Land Area	SOT-323-3: \( 4.20mm^2 (2.102.00mm) \) for the package alone \( 6.23mm^2 (2.652.35mm) \) when included with the recommended reflow PCB footprint
Height	0.95mm
3D Models	n/a
Common Uses	Diodes (SOT-323-3) Voltage regulators (SOT-323-8) MOSFETs (SOT-323-3)

This package is a little confusing because it shares two common names, the SOT-323-x and the SC-70-x. And it also can have a different pitch (the SOT-323-8, aka SC-70-8 or SC8 has a 0.5mm pitch). It has a lead-pitch double that of the SOT-363.

If the pin number isn’t specified, it is likely to be the 3 pin variant (this is the most common). The SOT-323 package has a significantly smaller PCB footprint than the SOT-23.