<s>
A	O
pin	O
header	O
(	O
or	O
simply	O
header	O
)	O
is	O
a	O
form	O
of	O
electrical	B-Protocol
connector	I-Protocol
.	O
</s>
<s>
A	O
male	B-Protocol
pin	I-Protocol
header	I-Protocol
consists	O
of	O
one	O
or	O
more	O
rows	O
of	O
metal	O
pins	O
molded	O
into	O
a	O
plastic	O
base	O
,	O
often	O
apart	O
,	O
though	O
available	O
in	O
many	O
spacings	O
.	O
</s>
<s>
Male	B-Protocol
pin	I-Protocol
headers	I-Protocol
are	O
cost-effective	O
due	O
to	O
their	O
simplicity	O
.	O
</s>
<s>
Historically	O
,	O
headers	O
have	O
sometimes	O
been	O
called	O
"	O
Berg	B-Device
connectors	I-Device
"	O
,	O
but	O
headers	O
are	O
manufactured	O
by	O
many	O
companies	O
.	O
</s>
<s>
Normally	O
pin	O
headers	O
are	O
through-hole	B-Algorithm
devices	I-Algorithm
(	O
THD	O
/	O
THT	O
)	O
,	O
but	O
surface-mount	O
devices	O
(	O
SMD	O
/	O
SMT	O
)	O
exist	O
too	O
.	O
</s>
<s>
Male	B-Protocol
pin	I-Protocol
headers	I-Protocol
are	O
often	O
associated	O
with	O
ribbon	B-Protocol
cable	I-Protocol
connectors	I-Protocol
.	O
</s>
<s>
When	O
used	O
alone	O
,	O
they	O
can	O
be	O
recipients	O
of	O
jumpers	B-Device
,	O
which	O
have	O
spacings	O
of	O
and	O
.	O
</s>
<s>
Pin	O
headers	O
with	O
a	O
plastic	O
guide	O
box	O
around	O
them	O
are	O
known	O
as	O
a	O
shrouded	O
header	O
or	O
box	O
header	O
and	O
are	O
normally	O
used	O
in	O
combination	O
with	O
insulation-displacement	B-Protocol
connectors	I-Protocol
(	O
IDC	B-Protocol
)	O
for	O
ribbon	O
cables	O
.	O
</s>
<s>
In	O
absence	O
of	O
a	O
pin	B-Protocol
1	I-Protocol
designation	O
on	O
the	O
header	O
,	O
if	O
a	O
designation	O
is	O
missing	O
from	O
the	O
header	O
,	O
the	O
PCB	O
may	O
have	O
a	O
marking	O
indicating	O
orientation	O
(	O
historically	O
,	O
the	O
solder	O
pad	O
around	O
the	O
hole	O
of	O
pin	B-Protocol
1	I-Protocol
of	O
a	O
THD	O
header	O
is	O
often	O
square	O
rather	O
than	O
round	O
)	O
.	O
</s>
<s>
For	O
multi-row	O
pin	O
headers	O
,	O
the	O
pin	O
number	O
is	O
more	O
complex	O
,	O
because	O
knowing	O
the	O
location	O
of	O
pin	B-Protocol
1	I-Protocol
does	O
n't	O
automatically	O
ensure	O
how	O
the	O
remaining	O
pins	O
are	O
numbered	O
.	O
</s>
