For a TO-type metal can package, pin 1 is located adjacent to what feature?

For a TO-type metal can package, pin 1 is located adjacent to what feature?

• A. Tab
• B. Ground pin
• C. Corner notch
• D. Heat sink

Answer: (A)

In TO-type metal can packages, there is a physical reference on the can used to identify pin 1. That reference is a tab on the package body, and pin 1 sits adjacent to it. The tab acts as the orientation marker so you can map the leads to the correct pins on the PCB footprint. The ground pin is just one of the leads, not a universal marker for pin 1; a corner notch isn’t a standard feature for this package, and a heat sink isn’t part of the typical bare metal can. So the tab on the can is the feature that pin 1 is next to.

In TO-type metal can packages, there is a physical reference on the can used to identify pin 1. That reference is a tab on the package body, and pin 1 sits adjacent to it. The tab acts as the orientation marker so you can map the leads to the correct pins on the PCB footprint. The ground pin is just one of the leads, not a universal marker for pin 1; a corner notch isn’t a standard feature for this package, and a heat sink isn’t part of the typical bare metal can. So the tab on the can is the feature that pin 1 is next to.