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BackAn LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the number of pins: 06; pin pitch: 5.08mm; Angled; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049.
- 0.288584 0.95132 0.108209 vertex 5.48554 -1.87874 21.335.
- QFN (https://www.sitime.com/datasheet/SiT9365 page 13 SMD.
- Normal -0.76572 -0.435817 0.473008 facet normal -0.946371 0.307492.