W27E257 Datasheet, PDF (13/14 Pages) Winbond – 32K X 8 ELECTRICALLY ERASABLE EPROM

PACKAGE DIMENSIONS
28-pin P-DIP
28
E1
1
S
A A2
L
D
15
B
e1
B1
14
E
Base Plane
A1
Seating Plane
a
eA
W27E257
Symbol ^{Dimension in Inches Dimension in mm}
Min. Nom. Max. Min. Nom. Max.
A
0.210
5.33
A1
0.010
0.25
A2
0.150 0.155 0.160 3.81 3.94 4.06
B
0.016 0.018 0.022 0.41 0.46 0.56
B1
0.058 0.060 0.064 1.47 1.52 1.63
c
0.008 0.010 0.014 0.20 0.25 0.36
D
1.460 1.470
37.08 37.34
E
0.590 0.600 0.610 14.99 15.24 15.49
E1
0.540 0.545 0.550 13.72 13.84 13.97
e1
0.090 0.100 0.110 2.29 2.54 2.79
L
0.120 0.130 0.140 3.05 3.30 3.56
a
0
15
0
15
eA
0.630 0.650 0.670 16.00 16.51 17.02
S
0.090
2.29
Notes:
1. Dimension D Max. & S include mold flash or
tie bar burrs.
2. Dimension E1 does not include interlead flash.
c
3. Dimension D & E1 include mold mismatch and
are determined at the mold parting line.
4. Dimension B1 does not include dambar
protrusion/intrusion.
5. Controlling dimension: Inches.
6. General appearance spec. should be based on
final visual inspection spec.
32-pin PLCC
4
5
HE
E
1 32
30
29
D HD
13
14
20
L
θ
Seating Plane
e
b
b1
GE
21
A2
A
A1
y
GD
c
Symbol
A
A1
A2
b1
b
c
D
E
e
GD
GE
HD
HE
L
y
θ
Dimension in Inches Dimension in mm
Min. Nom. Max. Min. Nom. Max.
0.140
3.56
0.020
0.50
0.105
0.110 0.115
2.67
2.80
2.93
0.026
0.028 0.032
0.66
0.71
0.81
0.016
0.018 0.022
0.41
0.46
0.56
0.008
0.010 0.014
0.20
0.25
0.35
0.547
0.550 0.553 13.89
13.97 14.05
0.447
0.450 0.453 11.35
11.43 11.51
0.044
0.050 0.056
1.12
1.27
1.42
0.490
0.390
0.51
0
0.410
0.530
0.430
12.45
9.91
12.9
5
10.41
13.46
10.92
0.585
0.590 0.595 14.86
14.99
15.11
0.485
0.075
0.49
0
0.090
0.495
0.095
12.32
1.91
12.45
2.29
12.57
2.41
0.004
0.10
0°
10°
0°
10°
Notes:
1. Dimension D & E do not include interlead flash.
2. Dimension b does not include dambar protrusion/intrusion.
3. Controlling dimension: Inches.
4. General appearance spec. should be based on final
visual inspection sepc.
- 13 -
Publication Release Date: January 1997
Revision A3