Thyristors
25 Amp High Temperature Alternistor Triacs
Dimensions —TO-218AC (K Package) — Isolated MountingTab
Inches
Millimeters
Min
TC Measurement Point
Dimension
U
(diameter)
C
B
Min
Max
0.835
0.630
0.188
0.070
0.497
0.655
0.029
0.095
0.625
0.219
0.437
0.068
0.055
0.115
0.016
0.016
0.165
0.095
Max
21.21
16.00
4.78
1.78
D
A
B
C
D
E
0.810
0.610
0.178
0.055
0.487
0.635
0.022
0.075
0.575
0.211
0.422
0.058
0.045
0.095
0.008
0.008
0.164
0.085
20.57
15.49
4.52
1.40
A
F
E
W
12.37
16.13
0.56
1.91
12.62
16.64
0.74
Gate
F
J
P
G
H
J
MT1
MT2
2.41
15.88
5.56
11.10
1.73
H
M
Q
14.61
5.36
10.72
1.47
G
R
K
L
N
Note: Maximum torque to
be applied to mounting tab
is 8 in-lbs. (0.904 Nm).
M
N
P
K
1.14
1.40
L
2.41
0.20
0.20
4.10
2.92
0.41
0.41
4.20
2.42
Q
R
U
W
2.17
Dimensions —TO-218X (J Package) — Isolated MountingTab
C
Inches
Millimeters
Dimension
D
B
Min
Max
0.835
0.630
0.188
0.070
0.497
0.655
0.029
0.095
0.625
0.264
0.228
0.088
0.177
0.042
0.121
0.096
0.166
0.165
0.618
0.005
0.012
0.032
0.095
Min
20.57
15.49
4.52
1.40
Max
21.21
16.00
4.78
1.78
U
Z
(diameter)
A
B
C
D
E
0.810
0.610
0.178
0.055
0.487
0.635
0.022
0.075
0.575
0.256
0.220
0.080
0.169
0.034
0.113
0.086
0.156
0.164
0.603
0.000
0.003
0.028
0.085
T
c
Measurement
Point
A
F
E
12.37
16.13
0.56
1.91
12.62
16.64
0.74
F
MT1
G
H
J
X
W
2.41
15.88
6.71
5.79
2.24
4.49
1.07
J
Gate
R
14.61
6.50
5.58
2.03
4.29
0.86
2.87
2.18
3.96
0.410
15.31
0.00
0.07
0.71
2.17
N
K
L
T
S
P
MT2
G
H
M
Y
M
N
P
K
L
Note: Maximum torque to
be applied to mounting tab
is 8 in-lbs . (0.904 Nm).
V
R
S
T
3.07
2.44
4.22
0.420
15.70
0.13
U
V
W
X
Y
Z
0.30
0.81
2.42
©2019 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 10/29/19