Small-outline transistor

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SOT transistor packaging

A small outline transistor (SOT) is a small footprint, discrete surface mount transistor commonly used in consumer electronics. Many manufacturers[1][2] also offer the nearly identical thin small outline transistor (TSOT) package for use in electronic circuits where height is an important consideration.

SOT23-3, SOT323, SOT416[edit]

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 (mm)
SOT23-3[3][4][5][6] SOT323[7][8] SOT416[9][10]
A
B
C
D
G 1.9 1.3 1.0
H
J
K
L 0.95 0.65 0.5
S
V

SOT23-5, SOT353[edit]

SOT23-5 (SOT25, SC74A, SOT753, SMT5),
SOT353 (SC70-5, SC88A, TSSOP-5, UMT5)
Dimensions (mm)
SOT23-5[11] SOT353[12][13]
A
B
C
D
F
G 0.95 0.65
H
J
K
L
R
S

SOT23-6, SOT363[edit]

SOT23-6 (SOT26, SC59-6, SC74, TSOP-6, SMT6, SM6, Mini6, SOT457),
SOT363 (SC70-6, SC88, TSSOP-6, UMT6, US6, S-Mini6)
Dimensions (mm)
SOT23-6[14][15][16] SOT363[17][18]
A 2.9 2.0
B 1.625 1.25
C 1.25 0.95
D 0.4 0.25
G 0.95 0.65
H 0.1
J 0.18
K 0.38
S 2.8 2.1
V

SOT23-8[edit]

SOT23-8 (SOT28)[19]
Dimensions (mm)
A
B
C
D
G 0.65
H
J
K
S
L

SOT143, SOT343[edit]

SOT143 (TO253), SOT343
Dimensions (mm)
SOT143 SOT343
A
B
C
D
F
G 1.78 1.2
H
J
K
L
R
S

SOT490[edit]

SOT490 (SOT523F, SC89, EMT3F)
Dimensions (mm)
A
B
C
D
G 0.5
J
K
S
L 1.0

SOT89-3[edit]

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 four leads when looking down at the part.

SOT89-3 (TO243AA, SC62, MPT3)[20]
Dimensions (mm)
A
B
C
D
E
F
G 1.5
J
K
S
L

SOT89-5[edit]

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
Dimensions (mm)
A
B
C
D
E
F
G 1.5
H
J
K
S
L

SOT223 (=SOT223-4)[edit]

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

SOT223-4 (SC73, TO261AA)[21][22][23]
Dimensions (mm)
Min Typ Max
A 1.80
A1 0.02
b 0.60 0.70 0.80
b2 2.90 3.00 3.10
c 0.24 0.26 0.32
D 6.30 6.50 6.70
e 2.3
e1 4.6
E 6.70 7.00 7.30
E1 3.30 3.50 3.70

SOT223-5[edit]

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

SOT223-5[24]
Dimensions (mm)
Min Typ Max
A 1.8
A1 0.02 0.04 0.10
A2 1.55 1.65
A3 0.87 0.91
b 0.41 0.46 0.51
b2 2.95 3.00 3.05
C 0.24 0.32
D 6.45 6.50 6.55
E 6.86 7.00 7.26
E1 3.45 3.50 3.55
e 1.27
e1 5.08
L 0.91 1.14

SOT223-8[edit]

The SOT223-8 package is a popular package for bridged quad transistors.

SOT223-8 (SM-8)[25]
Dimensions (mm)
Min Typ Max
A 1.60 1.70
A1 0.02 0.04 0.10
b 0.70 0.80 0.90
c 0.24 0.28 0.32
D 6.30 6.60 6.70
e 1.53
e1 4.59
E 6.70 7.00 7.30
E1 3.30 3.50 3.70
L 0.75 0.90 1.00
ø 45°
ø1 15°
ø2 10°

See also[edit]

References[edit]