The TO-99 (Transistor Outline 99) is a 8-pin can-type through-hole component package. It is an older through-hole part which has been used for ICs, especially op-amps.
The dimensions of the TO-99 package are shown below. The pins are arranged of the circumference of a 2.54mm (0.1inch) radius circle with a pin placed every 45°. A metal tab indicates pin 8.
The popular LM741 op-amp comes in this package, the pinout is shown below:
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