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What Is The Difference Between SOT23 And SOT323?

Q: What are SOT23 and SOT323 both?

Plastic and surface-mounted packages.

Sophie

Published: 21 February 2022 | Last Updated: 21 February 2022

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Standard Rectifier Diode 1 Pair Series Connection Small Signal =< 200mA (Io), Any Speed -55°C~150°C 200mA 70V-DC TO-236-3, SC-59, SOT-23-3 Surface Mount

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Standard Rectifier Diode 1 Pair Series Connection Small Signal =< 200mA (Io), Any Speed -55°C~150°C 200mA 70V-DC TO-236-3, SC-59, SOT-23-3 Surface Mount

A small outline transistor (SOT) is a discrete surface mount transistor with a small footprint that is extensively used in consumer electronics. SOT23 versions are the most common, although manufacturers also provide the nearly identical thin tiny outline transistor (TSOT) package, which is useful when height is a concern. The article is going to introduce the differences between the two package.

This short video introduces how to soldering SOT23 SMD gadget.

Hand Soldering SOT23 SMD component

Catalog

SOT23 vs SOT323 Overview

SOT23 and SOT323 are both plastic and surface-mounted packages. SOT23 owns 3 terminals, 1.9mm pitch, 2.9mm x 1.33mm x 1mm body, while SOT323 boasts 3 leads, 1.3mm pitch, 2mm x 1.25mm x 0.95mm body.

SOT23 vs SOT323 Pinout

SOT23 and SOT323 Differences In Feature

1.Two-line bidirectional ESD protectionl For CAN-Bus applications and interface ESD protection

2. Compact SOT-323 and SOT-23 packages

3. Low package height:

-SOT-323: 1.1mm

-SOT-23: 1.2mm

4. AEC-Q101 qualified versions available

5. Working range:

-VCAN16A2: ±16V

-VCAN33A2: ± 33V

6. Low leakage current: <0.05μA

7. Low load capacitance typical CD:

-VCAN16A2: ±16V, <18.5pF at 0V

-VCAN33A2: ±33V, <9.7pF at 0V

8. ESD protection acc. IEC 61000-4-2:

-±30kV contact discharge

-±30kV air discharge

9. Soldering can be checked by standard vision inspection (AOI = automated optical inspection)

10. e3 – pins plated with tin (Sn)

The Parameters Differences In SOT23 And SOT323

	Dimensions (mm)
	SOT23	SOT323
A	2.9	2.9
B	1.3	1.3
C
D
G	1.9	1.3
H
J
K
L	0.95	0.65
S
V

From the image and the diagram, we can see that there are two different dimensions in SOT23 and SOT323: The length of G is 1.9mm and 1.3mm and L is 0.95mm and 0.65mm respectively. When using the packages, we should check whether these two dimensions fit the component or not.

The Package Outlines of SOT323 and SOT23

sot23 package.png

SOT23 Package Outline

Symbol	Parameter	Min	Typ	Nom	Max	Unit
D	package length	2.8		2.9	3	mm
E	package width	1.2		1.3	1.4	mm
A	seated height	0.9		1	1.1	mm
e	nominal pitch	-	■	1.9	-	mm
ei	minimal pitch	-	-		-	mm
n2	actual quantity of termination	-	■	3	-

The Parameters Of SOT23 Package

sot323 package.png

SOT323 Package Outline

Symbol	Parameter	Min	Typ	Nom	Max	Unit
D	package length	1.8		2	2.2	mm
E	package width	1.15		1.25	1.35	mm
A	seated height	0.8		0.95	1.1	mm
e	nominal pitch	-	■	1.3	-	mm
n2	actual quantity of termination	-	■	3	-

The Parameters Of SOT23 Package

The Soldering Differences in SOT23 and SOT323

Reflow Soldering

REFLOW SOLDERING.jpg

Wave Soldering

WAVE SOLDERING.jpg

Conclusion

From above, we can know that there are a few differences between SOT23 and SOT323. For instance, the pitch of SOT323 is 0.6mm small than that of SOT23, and SOT323’s dimensions of body are smaller than SOT23’s, etc. There are various similarity between them, but we should check the detailed dimensions when using them.

Frequently Asked Questions

What does SOT stands for?

Small Outline Transistor.

What are SOT23 and SOT323 both?

Plastic and surface-mounted packages.

How many terminals does SOT2 have?

3.

How many terminals does SOT2 have?

1.9mm pitch.

What is the difference between SOT323 and SOT23?

SOT23 package.

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