
RM3283
PRODUCT SPECIFICATION
10
Mechanical Dimensions
(continued)
20-Lead Ceramic DIP
D
b2
e
b1
E
Q
A
L
s1
c1
eA
a
Note 1
A
b1
b2
c1
D
—
.014
.045
.008
—
.200
.023
.065
.015
1.060
—
.36
1.14
.20
—
5.08
.58
1.65
.38
25.92
Symbol
Inches
Min.
Max.
Min.
Max.
Millimeters
Notes
E
e
eA
.220
.310
5.59
7.87
.100 BSC
.300 BSC
2.54 BSC
7.62 BSC
L
Q
s1
.125
.015
.005
90
.200
.060
—
105
3.18
.38
.13
90
5.08
1.52
—
105
3
6
8
4
4
8
2, 8
5, 9
7
a
Notes:
1. Index area: a notch or a pin one identification mark shall be located
adjacent to pin one. The manufacturer's identification shall not be
used as pin one identification mark.
2. The minimum limit for dimension "b2" may be .023(.58mm) for leads
number 1, 10, 11 and 20 only.
3. Dimension "Q" shall be measured from the seating plane to the
base plane.
4. This dimension allows for off-center lid, meniscus and glass overrun.
5. The basic pin spacing is .100 (2.54mm) between centerlines. Each
pin centerline shall be located within
.010 (.25mm) of its exact
longitudinal position relative to pins 1 and 20.
6. Applies to all four corner's (leads number 1, 10, 11, and 20).
7. "eA" shall be measured at the center of the lead bends or at the
centerline of the leads when "
a
" is 90
.
8. All leads – Increase maximum limit by .003(.08mm) measured at the
center of the flat, when lead finish is applied.
9. Eighteen spaces.