<s>
In	O
electronics	O
,	O
TO-5	O
is	O
a	O
designation	O
for	O
a	O
standardized	O
metal	O
semiconductor	B-Algorithm
package	I-Algorithm
used	O
for	O
transistors	O
and	O
some	O
integrated	O
circuits	O
.	O
</s>
<s>
Somewhat	O
incorrectly	O
,	O
TO-5	O
and	O
TO-39	B-Algorithm
are	O
often	O
used	O
in	O
manufacturer	O
's	O
literature	O
as	O
synonyms	O
for	O
any	O
package	O
with	O
the	O
cap	O
dimensions	O
of	O
TO-5	O
,	O
regardless	O
of	O
the	O
number	O
of	O
leads	O
,	O
or	O
even	O
for	O
any	O
package	O
with	O
the	O
diameter	O
of	O
TO-5	O
,	O
regardless	O
of	O
the	O
cap	O
height	O
and	O
the	O
number	O
of	O
leads	O
.	O
</s>
<s>
Compared	O
to	O
TO-5	O
,	O
for	O
the	O
other	O
variants	O
(	O
except	O
TO-33	O
and	O
TO-42	O
)	O
the	O
minimum	O
length	O
of	O
the	O
leads	O
was	O
shortened	O
from	O
to	O
which	O
is	O
sufficient	O
for	O
through-hole	B-Algorithm
technology	I-Algorithm
and	O
leads	O
to	O
a	O
cost	O
reduction	O
,	O
whereas	O
the	O
longer	O
leads	O
were	O
needed	O
for	O
point-to-point	O
construction	O
.	O
</s>
<s>
Before	O
the	O
introduction	O
of	O
dual	B-Algorithm
in-line	I-Algorithm
packages	I-Algorithm
in	O
1965	O
,	O
integrated	O
circuits	O
were	O
packaged	O
mostly	O
in	O
metal	O
can	O
packages	O
such	O
as	O
the	O
TO-5	O
variants	O
with	O
more	O
than	O
3	O
leads	O
.	O
</s>
<s>
The	O
TO-39	B-Algorithm
,	O
TO-9	O
,	O
and	O
TO-16	O
packages	O
have	O
3	O
leads	O
and	O
differ	O
in	O
the	O
shortened	O
leads	O
mentioned	O
above	O
from	O
TO-5	O
.	O
</s>
<s>
The	O
different	O
outlines	O
are	O
now	O
defined	O
as	O
variants	O
of	O
TO-205	O
:	O
TO-5	O
is	O
renamed	O
to	O
TO-205-AA	O
,	O
TO-12	O
to	O
TO-205-AB	O
,	O
TO-33	O
to	O
TO-205-AC	O
,	O
TO-39	B-Algorithm
to	O
TO-205-AD	O
.	O
</s>
