Document Number: 91362 www.vishay.com
Revision: 15-Sep-08 1
Package Information
Vishay Siliconix
TO-251AA (HIGH VOLTAGE)
Notes
1. Dimensioning and tolerancing per ASME Y14.5M-1994.
2. Dimension are shown in inches and millimeters.
3. Dimension D and E do not include mold flash. Mold flash shall not exceed 0.13 mm (0.005") per side. These dimensions are measured at the
outermost extremes of the plastic body.
4. Thermal pad contour optional with dimensions b4, L2, E1 and D1.
5. Lead dimension uncontrolled in L3.
6. Dimension b1, b3 and c1 apply to base metal only.
7. Outline conforms to JEDEC outline TO-251AA.
Base
metal
Plating
b1, b3
(b, b2)
c1
(c)
Section B - B and C - C
D
A
c2
c
Lead tip
5
5
(Datum A)
Thermal PAD
E1
4
D1
View A - A
A1
A
A
C
Seating
plane
C
C
B
B
θ1
θ2
B
4
4
4
3
5
L1
L
L3
3 x b2
3 x b
3
b4
E
2 x e
0.010 C B
M
A
0.25
0.010 BA
0.25
L2
A
C
M
MILLIMETERS INCHES MILLIMETERS INCHES
DIM. MIN. MAX. MIN. MAX. DIM. MIN. MAX. MIN. MAX.
A 2.18 2.39 0.086 0.094 D1 5.21 - 0.205 -
A1 0.89 1.14 0.035 0.045 E 6.35 6.73 0.250 0.265
b 0.64 0.89 0.025 0.035 E1 4.32 - 0.170 -
b1 0.65 0.79 0.026 0.031 e 2.29 BSC 2.29 BSC
b2 0.76 1.14 0.030 0.045 L 8.89 9.65 0.350 0.380
b3 0.76 1.04 0.030 0.041 L1 1.91 2.29 0.075 0.090
b4 4.95 5.46 0.195 0.215 L2 0.89 1.27 0.035 0.050
c 0.46 0.61 0.018 0.024 L3 1.14 1.52 0.045 0.060
c1 0.41 0.56 0.016 0.022 θ1 0' 15' 0' 15'
c2 0.46 0.86 0.018 0.034 θ2 25' 35' 25' 35'
D 5.97 6.22 0.235 0.245
ECN: S-82111-Rev. A, 15-Sep-08
DWG: 5968