TO-99 Component Package
Overview
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.
![](/assets/images/lm741h-op-amp-to-99-component-package-photo-e0cfc5f2e9bb57d5a31cecd142eb01b4.jpg)
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.
![](/assets/images/to-99-component-package-dimensions-analog-devices-a58ce86135660aab452fe958f512ffec.png)
The popular LM741 op-amp comes in this package, the pinout is shown below:
![](/assets/images/lm741-op-amp-pinout-in-to-99-component-package-a6abef6452614f6ce78028cde727c9cc.png)