Hermetic Packages for Integrated Circuits Ceramic Metal Seal Flatpack Packages (Flatpack) E 1 K42.A TOP BRAZED 42 LEAD CERAMIC METAL SEAL FLATPACK PACKAGE N e INCHES A A D b E1 S1 L C Q A E2 c1 LEAD FINISH BASE METAL (c) SYMBOL MILLIMETERS MIN MAX MIN MAX NOTES A - b 0.017 0.100 - 2.54 - 0.025 0.43 0.64 - b1 c 0.017 0.023 0.43 0.58 - 0.007 0.013 0.18 0.33 - c1 0.007 0.010 0.18 0.25 - D 1.045 1.075 26.54 27.31 3 16.00 16.51 - 17.27 3 E 0.630 0.650 E1 - 0.680 E2 0.530 0.550 e 13.46 0.050 BSC 13.97 1.27 BSC 11 k - - - - - L 0.320 0.350 8.13 8.89 - (b) Q 0.045 0.065 1.14 1.65 8 SECTION A-A S1 0.000 - 0.00 - 6 M - 0.0015 - b1 M M 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. 11. The basic lead spacing is 0.050 inch (1.27mm) between center lines. Each lead centerline shall be located within ±0.005 inch (0.13mm) of its exact longitudinal position relative to lead 1 and the highest numbered (N) lead. 56 N 42 0.04 42 - Rev. 0 6/17/94