<s>
TO-126	B-Algorithm
is	O
a	O
type	O
of	O
semiconductor	B-Algorithm
package	I-Algorithm
for	O
devices	O
with	O
three	O
pins	O
,	O
such	O
as	O
transistors	B-Application
.	O
</s>
<s>
On	O
one	O
side	O
of	O
the	O
package	O
typically	O
a	O
metal	O
sheet	O
is	O
exposed	O
,	O
with	O
the	O
transistor	B-Application
die	O
bonded	O
to	O
the	O
other	O
side	O
of	O
the	O
metal	O
sheet	O
inside	O
the	O
package	O
.	O
</s>
<s>
This	O
allows	O
for	O
an	O
efficient	O
heat	O
transfer	O
from	O
the	O
transistor	B-Application
die	O
to	O
an	O
external	O
heat	O
sink	O
but	O
also	O
implies	O
that	O
the	O
metal	O
sheet	O
is	O
electrically	O
connected	O
to	O
the	O
die	O
(	O
for	O
a	O
bipolar	O
junction	O
transistor	B-Application
usually	O
the	O
collector	O
is	O
connected	O
to	O
this	O
metal	O
sheet	O
)	O
.	O
</s>
<s>
The	O
JEDEC	O
TO-126	B-Algorithm
descriptor	O
is	O
derived	O
from	O
the	O
original	O
full	O
name	O
for	O
the	O
package	O
:	O
Transistor	B-Application
Outline	O
Package	O
,	O
Case	O
Style	O
126	O
.	O
</s>
