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Vishay Siliconix

Revision: 27-Dec-2021

1

Document Number: 91362

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

Case Outline for TO-251AA (High Voltage)

OPTION 1:

Notes

• Dimensioning and tolerancing per ASME Y14.5M-1994

• Dimension are shown in inches and millimeters

• 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

• Thermal pad contour optional with dimensions b4, L2, E1 and D1

• Lead dimension uncontrolled in L3

• Dimension b1, b3 and c1 apply to base metal only

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

1

0'

15'

0'

15'

c2

0.46

0.86

0.018

0.034

2

25'

35'

25'

35'

D

5.97

6.22

0.235

0.245

ECN: E21-0682-Rev. C, 27-Dec-2021

DWG: 5968

Base

metal

Plating

b1, b3

(b, b2)

c1

(c)

Section B - B and C - C

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

B

A

0.25

L2

A

C

M