SOT-323 COMPONENT PACKAGE

SOT-323 Component Package

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Overview

NameSOT-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 ToSOT-363
MountingSMD
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)
SolderabilityDifficult 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 AreaSOT-323-3:
\( 4.20mm^2 (2.10*2.00mm) \) for the package alone
\( 6.23mm^2 (2.65*2.35mm) \) when included with the recommended reflow PCB footprint
Height0.95mm
3D Modelsn/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.

SOT-323-3

This package is also commonly known as the SC-70.

3D model of the SOT-323-3 (SC-70-3) component package.

3D model of the SOT-323-3 (SC-70-3) component package.

SOT-323-5

Dimensions and recommended land pattern for the SOT-323-5 (SC-70-5) component package.

Dimensions and recommended land pattern for the SOT-323-5 (SC-70-5) component package.

3D model of the SOT-323-5 (SC-70-5) component package.

3D model of the SOT-323-5 (SC-70-5) component package.


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