40-Lead Ceramic Dual In-Line Package [CERDIP] (Q-40) Dimensions shown in inches and (millimeters) a 0.100 (2.54) MAX 0.005 (0.13) MIN 40 21 0.620 (15.75) 0.510 (12.95) 1 20 PIN 1 2.096 (52.23) MAX 0.070 (1.78) 0.015 (0.38) 0.225 (5.72) MAX 0.200 (5.08) 0.125 (3.18) 0.026 (0.66) 0.014 (0.36) 0.100 (2.54) BSC 0.065 (1.65) 0.045 (1.14) SEATING PLANE 0.63 (16.00) 0.59 (14.93) 15° 0° CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. 0.018 (0.46) 0.008 (0.20)