W24257AS-20 datasheet(10/11 Pages) WINBOND

Part #	W24257AS-20

Description	32K X 8 High Speed CMOS Static RAM

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Manufacturer	WINBOND [Winbond]

Direct Link	http://www.winbond.com

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W24257A

- 10 -

Package Dimensions, continued

28-pin SO Wide Body

2

1

A

28

15

14

1

e

S

E

H

b

Seating Plane

A A

y

L

e

c

See Detail F

D

E

1

e

Detail F

1. Dimensions D Max. & S include mold flash

or tie bar burrs.

2. Dimension b does not include dambar

protrusion/intrusion.

3. Dimensions D & E include mold mismatch

and are determined at the mold parting line.

.

0.25

0.20

0.010

0.008

Notes:

Symbol

Min. Nom.

Max.

Nom.

Min.

Dimension in Inches

Dimension in mm

A

b

c

D

e

HE

L

y

A

LE

1

2

E

0.014

0.36

0.112

2.85

0.004

0.093

0.014

0.098

0.016

0.103

0.020

2.36

0.36

0.10

2.49

0.41

2.62

0.51

0.059

0.004

0

10

0.713

0.067

0.733

0.075

1.50

18.11

1.70

18.62

1.91

0.477

0.465

0.453

12.12

11.81

11.51

10

0

0.10

8.53

8.41

8.28

0.336

0.331

0.326

0.71

0.91

1.12

0.028

0.036

0.044

4. Controlling dimension: Inches.

5. General appearance spec should be based

on final visual inspection spec.

1.12

1.27

1.42

0.044

0.050

0.056

S

1.19

0.047

θ

28-pin Standard Type One TSOP

Note: Controlling dimension: Millimeters

A

2

1

L

L1

Y

c

E

H

D

b

e

Min.

Dimension in Inches

Nom. Max. Min. Nom. Max.

Symbol

1.20

0.05

0.15

1.05

1.00

0.95

0.17

0.10

11.70

7.90

13.20

0.50

0.00

0

0.20

0.27

0.15

0.21

11.80

11.90

8.00

8.10

13.40

13.60

0.55

0.60

0.70

0.25

0.10

3

5

0.047

0.006

0.041

0.040

0.035

0.007

0.008

0.011

0.004

0.006

0.008

0.461

0.465

0.469

0.311

0.315

0.319

0.520

0.528

0.536

0.022

0.020

0.024

0.028

0.010

0.000

0.004

0

3

5

0.002

A

b

c

D

E

e

L

Y

1

2

A

H D

θ

Dimension in mm

θ

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