Hermetic Packages for Integrated Circuits Ceramic Metal Seal Flatpack Packages (Flatpack) K18.B A e 18 LEAD CERAMIC METAL SEAL FLATPACK PACKAGE A INCHES PIN NO. 1 ID AREA SYMBOL -A- D -B- S1 b MIN MILLIMETERS MAX MIN MAX NOTES A 0.045 0.115 1.14 2.92 - b 0.015 0.022 0.38 0.56 - b1 0.015 0.019 0.38 0.48 - c 0.004 0.009 0.10 0.23 - c1 0.004 0.006 0.10 0.15 - D 0.430 0.450 10.92 11.43 3 E1 0.004 M H A-B S Q D S 0.036 M H A-B S D S C E -D- A -C- -HE2 L E3 SEATING AND BASE PLANE c1 L E3 (c) b1 M M (b) SECTION A-A NOTES: 1. Index area: A notch or a pin one identification mark shall be located adjacent to pin one and shall be located within the shaded area shown. The manufacturer’s identification shall not be used as a pin one identification mark. Alternately, a tab (dimension k) may be used to identify pin one. 2. If a pin one identification mark is used in addition to a tab, the limits of dimension k do not apply. 3. This dimension allows for off-center lid, meniscus, and glass overrun. 4. Dimensions b1 and c1 apply to lead base metal only. Dimension M applies to lead plating and finish thickness. The maximum limits of lead dimensions b and c or M shall be measured at the centroid of the finished lead surfaces, when solder dip or tin plate lead finish is applied. 5. N is the maximum number of terminal positions. 6. Measure dimension S1 at all four corners. 7. For bottom-brazed lead packages, no organic or polymeric materials shall be molded to the bottom of the package to cover the leads. 8. Dimension Q shall be measured at the point of exit (beyond the meniscus) of the lead from the body. Dimension Q minimum shall be reduced by 0.0015 inch (0.038mm) maximum when solder dip lead finish is applied. 9. Dimensioning and tolerancing per ANSI Y14.5M - 1982. 10. Controlling dimension: INCH. 48 0.320 0.340 8.13 8.64 - - 0.360 - 9.14 3 E2 0.220 0.240 5.59 6.10 - E3 0.030 - 0.76 - 7 2 e LEAD FINISH BASE METAL E E1 0.050 BSC 1.27 BSC - k 0.008 0.015 0.20 0.38 L 0.280 0.320 7.11 8.13 - Q 0.026 0.045 0.66 1.14 8 S1 0.000 - 0.00 - - M - 0.0015 - 0.04 - N 18 18 Rev. 0 11/19/96