The
TO-72
is
a
type of 'metal can'
(also known as 'metal header')
package for
semiconductor devices. It is sealed
hermetically
to protect the
device from environmental factors such as moisture and contaminants.
The TO-72 is commonly used in housing transistors.
The TO-72 is made primarily of metal, with the microchip mounted on the
die pad of its metal header and then sealed with a metal cap by
high-current welding.
The TO-72 is similar to the TO-52 but it is
slightly bigger than the latter because of its taller cap.
Most TO-72 packages come with three or
four terminals, since the TO-72 is commonly used for discrete devices
with three terminals (such as bipolar and single-gate field effect
transistors) or four terminals (such as dual-gate field effect
transistors).
Table 1.
Properties of a Typical 4-lead TO-72 Package
|
Base
Diameter |
Cap
Diameter |
Cap
Height |
Min. Lead
Length |
Lead
Pitch |
|
5.55 mm |
4.73 mm |
4.83 mm |
12.7 mm |
2.54 mm |
