Small-outline transistor

SOT transistor packaging

A small outline transistor (SOT) is a small footprint, discrete surface mount transistor commonly used in consumer electronics.

SOT23-3, SOT323, SOT416

The SOT23-3 package is very popular and a common package for transistors, and is also used for diodes and voltage regulators.

SOT23-3 (SOT23, TO236AB, SOT346, SC59A, TO236AA, SMT3),
SOT323 (SC70-3, UMT3),
SOT416 (SOT523, SC75A, SC90, EMT3)

		Dimensions (in millimeters)
View from top and side	Symbol	SOT23-3	SOT323	SOT416	3D view
	A
	B
	C
	D
	G	1.9	1.3	1.0
	H
	J
	K
	L	0.95	0.65	0.5
	S
	V
	ref

SOT23-5, SOT353

SOT23-5 (SOT25, SC74A, SOT753, SMT5),
SOT353 (SC70-5, SC88A, TSSOP-5, UMT5)

		Dimensions (in millimeters)
View from top and side	Symbol	SOT23-5	SOT353	3D view
	A
	B
	C
	D
	F
	G	0.95	0.65
	H
	J
	K
	L
	R
	S
	ref

SOT23-6, SOT363

SOT23-6 (SOT26, SC59-6, SC74, TSOP-6, SMT6, SM6, Mini6, SOT457),
SOT363 (SC70-6, SC88, TSSOP-6, UMT6, US6, S-Mini6)

		Dimensions (in millimeters)
View from top and side	Symbol	SOT23-6	SOT363	3D view
	A	2.9
	B	1.625
	C	1.25
	D	0.4
	G	0.95	0.65
	H
	J
	K
	S	2.8
	V
	ref

SOT23-8

SOT23-8 (SOT28)

View from top and side	Symbol	Dimensions (in millimeters)	3D view
	A
	B
	C
	D
	G	0.65
	H
	J
	K
	S
	L
	ref

SOT143, SOT343

SOT143 (TO253), SOT343

		Dimensions (in millimeters)
View from top and side	Symbol	SOT143	SOT343	3D view
	A
	B
	C
	D
	F
	G	1.78	1.2
	H
	J
	K
	L
	R
	S
	ref

SOT490

SOT490 (SOT523F, SC89, EMT3F)

View from top and side	Symbol	Dimensions (in millimeters)	3D view
	A
	B
	C
	D
	G	0.5
	J
	K
	S
	L	1.0
	ref

SOT89-3

The SOT89-3 electrically only has three leads (contact/pin). The wide lead (tab) is physically part of the middle lead on the other side of the package. Some call this package a SOT89-4, since it visually appears to have five leads when looking down at the part.

SOT89-3 (TO243AA, SC62, MPT3)

View from top and side	Symbol	Dimensions (in millimeters)	3D view
	A
	B
	C
	D
	E
	F
	G	1.5
	J
	K
	S
	L
	ref

SOT89-5

The SOT89-5 electrically only has five leads (contact/pin). The middle lead is physically part of the middle lead on the other side of the package. Some call this package a SOT89-6, since it visually appears to have six leads when looking down at the part.

SOT89-5

View from top and side	Symbol	Dimensions (in millimeters)	3D view
	A
	B
	C
	D
	E
	F
	G	1.5
	H
	J
	K
	S
	L
	ref

SOT223-4

The SOT223-4 package is a popular package for voltage regulators.

SOT223-4 (SC73, TO261AA)

View from top and side	Symbol	Dimensions (in millimeters)	3D view
	A
	B
	C
	D
	F
	G	2.2
	H
	J
	K
	L
	S
	ref

SOT223-5

The SOT223-5 package is a popular package for voltage regulators.

SOT223-5

View from top and side	Symbol	Dimensions (in millimeters)	3D view
	A
	B
	C
	D
	F
	G	1.5
	H
	J
	K
	L
	S
	ref

See also

• List of electronics package dimensions