Small-outline transistor

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	^[1]^[2]^[3]^[4]	^[5]^[6]	^[7]^[8]

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	^[9]	^[10]^[11]

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	^[12]^[13]^[14]	^[15]^[16]

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	^[17]

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 3 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 4 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	^[18]

SOT89-5

The SOT89-5 electrically only has 5 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 6 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	^[19]^[20]

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

References

Semiconductor packages

Diode	DO-204 DO-213 / MELF DO-214 / SMA / SMB / SMC SOD

Transistor	SOT / TSOT TO-3 TO-5 TO-18 TO-66 TO-92 TO-126 TO-220 TO-263 / D2PAK

Single row	SIP / SIL

Dual row	DFN DIP / DIL Flat Pack SO / SOIC SOP / SSOP TSOP / TSSOP ZIP

Quad row	LCC PLCC QFN QFP QUIP / QUIL

Grid array	BGA eWLB LGA PGA

Wafer	COB COF COG CSP Flip Chip PoP QP UICC WL-CSP / WLP

Related topics	Electronic packaging List of integrated circuit package dimensions Integrated circuit packaging List of integrated circuit packaging types

Note: It's relatively common to find packages that contain other components than their designated ones, such as voltage regulators in transistor packages, etc.

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