Square vs Round pad
$begingroup$
I'm curious why PCBs have one square pad in row for 0.1" headers.
What is purpose of putting one square pad? What it indicates? Can you push more amps through square pad than round?
header pads
asked 4 hours ago
SilvioCroSilvioCro
8019
$endgroup$
add a comment |
$begingroup$
I'm curious why PCBs have one square pad in row for 0.1" headers.
What is purpose of putting one square pad? What it indicates? Can you push more amps through square pad than round?
header pads
asked 4 hours ago
SilvioCroSilvioCro
8019
$endgroup$
add a comment |
$begingroup$
I'm curious why PCBs have one square pad in row for 0.1" headers.
What is purpose of putting one square pad? What it indicates? Can you push more amps through square pad than round?
header pads
asked 4 hours ago
SilvioCroSilvioCro
8019
$endgroup$
I'm curious why PCBs have one square pad in row for 0.1" headers.
What is purpose of putting one square pad? What it indicates? Can you push more amps through square pad than round?
header pads
header pads
asked 4 hours ago
SilvioCroSilvioCro
8019
asked 4 hours ago
SilvioCroSilvioCro
8019
asked 4 hours ago
SilvioCroSilvioCro
8019
asked 4 hours ago
SilvioCroSilvioCro
8019
asked 4 hours ago
SilvioCroSilvioCro
8019
8019
add a comment |
add a comment |
4 Answers
4
active
oldest
votes
$begingroup$
This is to identify which pin is "pin 1".
In the case of a single-row header with no orientation key, this might not really matter, but the layout tool might do this by default and the designer didn't think to turn it off.
If this were to be used with a connector that does have an orientation key, I'd much rather also have a pin 1 indicator in silkscreen, so that the orientation can be checked after the connector is loaded (and without having to flip the board over).
Can you push more amps through square pad than round?
No, it won't cause any significant difference on the circuit performance.
(As pointed out in comments, for an RF or high-voltage application you might need to consider more carefully before using this method of orientation marking)
answered 4 hours ago
The PhotonThe Photon
84.9k397196
$endgroup$
4
$begingroup$
@Hearth On RF/high speed circuits sharp angles might act as antennas, so the trace and pad shapes do make difference.
$endgroup$
– Eugene Sh.
4 hours ago
2
$begingroup$
@EugeneSh. Well, maybe I consider RF circuitry to be "very strange". I can't imagine anyone would use 100mil pin headers in anything RF, anyway.
$endgroup$
– Hearth
4 hours ago
2
$begingroup$
And in a high-voltage circuit the sharp corners can concentrate fields. But hopefully nobody is using unshrouded headers for high voltage.
$endgroup$
– The Photon
4 hours ago
1
$begingroup$
What mil stands for? @EugeneSh.
$endgroup$
– SilvioCro
4 hours ago
4
$begingroup$
@SilvioCro 1 mil = 0.001 inch. It's a very common unit for Americans doing board design, roughly equal to 0.025 mm.
$endgroup$
– The Photon
4 hours ago
|
show 16 more comments
$begingroup$
Not a standard, but it's useful to mark where pin 1 is. This might be useful if you don't have a silkscreen, but you wish to mark the orientation of the socket.
answered 4 hours ago
awjloganawjlogan
3,64211328
$endgroup$
$begingroup$
But in case with Arduino Nano(for example), it doesn't help.
$endgroup$
– SilvioCro
4 hours ago
1
$begingroup$
@SilvioCro Why not? Looking at a picture of the Nano (and some knockoffs), the TX1 pin is usually square, so you could work out the orientation based on that.
$endgroup$
– awjlogan
4 hours ago
$begingroup$
@SilvioCro, It is a common practice, most PCB software / manufacturer prefer this and since it doesn't change much electronically (except RF), it is fine to just add it
$endgroup$
– Electric_90
3 hours ago
add a comment |
$begingroup$
It is there to mark the location of a specific pin (mostly pin 1). It helps in deciding the orientation in which a component should be placed.
No you can't push more amps through the square pad. Check to see if the trace running to that pad is wider than the other traces, if not than it is similar to the others.
The square pad doesn't make a electronic difference when compared to round pads.
answered 4 hours ago
Electric_90Electric_90
714117
$endgroup$
add a comment |
$begingroup$
It indicates the location of pin 1
answered 4 hours ago
uglyoldbobuglyoldbob
1195
$endgroup$
add a comment |
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4 Answers
4
active
oldest
votes
4 Answers
4
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
This is to identify which pin is "pin 1".
In the case of a single-row header with no orientation key, this might not really matter, but the layout tool might do this by default and the designer didn't think to turn it off.
If this were to be used with a connector that does have an orientation key, I'd much rather also have a pin 1 indicator in silkscreen, so that the orientation can be checked after the connector is loaded (and without having to flip the board over).
Can you push more amps through square pad than round?
No, it won't cause any significant difference on the circuit performance.
(As pointed out in comments, for an RF or high-voltage application you might need to consider more carefully before using this method of orientation marking)
answered 4 hours ago
The PhotonThe Photon
84.9k397196
$endgroup$
4
$begingroup$
@Hearth On RF/high speed circuits sharp angles might act as antennas, so the trace and pad shapes do make difference.
$endgroup$
– Eugene Sh.
4 hours ago
2
$begingroup$
@EugeneSh. Well, maybe I consider RF circuitry to be "very strange". I can't imagine anyone would use 100mil pin headers in anything RF, anyway.
$endgroup$
– Hearth
4 hours ago
2
$begingroup$
And in a high-voltage circuit the sharp corners can concentrate fields. But hopefully nobody is using unshrouded headers for high voltage.
$endgroup$
– The Photon
4 hours ago
1
$begingroup$
What mil stands for? @EugeneSh.
$endgroup$
– SilvioCro
4 hours ago
4
$begingroup$
@SilvioCro 1 mil = 0.001 inch. It's a very common unit for Americans doing board design, roughly equal to 0.025 mm.
$endgroup$
– The Photon
4 hours ago
|
show 16 more comments
$begingroup$
This is to identify which pin is "pin 1".
In the case of a single-row header with no orientation key, this might not really matter, but the layout tool might do this by default and the designer didn't think to turn it off.
If this were to be used with a connector that does have an orientation key, I'd much rather also have a pin 1 indicator in silkscreen, so that the orientation can be checked after the connector is loaded (and without having to flip the board over).
Can you push more amps through square pad than round?
No, it won't cause any significant difference on the circuit performance.
(As pointed out in comments, for an RF or high-voltage application you might need to consider more carefully before using this method of orientation marking)
answered 4 hours ago
The PhotonThe Photon
84.9k397196
$endgroup$
4
$begingroup$
@Hearth On RF/high speed circuits sharp angles might act as antennas, so the trace and pad shapes do make difference.
$endgroup$
– Eugene Sh.
4 hours ago
2
$begingroup$
@EugeneSh. Well, maybe I consider RF circuitry to be "very strange". I can't imagine anyone would use 100mil pin headers in anything RF, anyway.
$endgroup$
– Hearth
4 hours ago
2
$begingroup$
And in a high-voltage circuit the sharp corners can concentrate fields. But hopefully nobody is using unshrouded headers for high voltage.
$endgroup$
– The Photon
4 hours ago
1
$begingroup$
What mil stands for? @EugeneSh.
$endgroup$
– SilvioCro
4 hours ago
4
$begingroup$
@SilvioCro 1 mil = 0.001 inch. It's a very common unit for Americans doing board design, roughly equal to 0.025 mm.
$endgroup$
– The Photon
4 hours ago
|
show 16 more comments
$begingroup$
This is to identify which pin is "pin 1".
In the case of a single-row header with no orientation key, this might not really matter, but the layout tool might do this by default and the designer didn't think to turn it off.
If this were to be used with a connector that does have an orientation key, I'd much rather also have a pin 1 indicator in silkscreen, so that the orientation can be checked after the connector is loaded (and without having to flip the board over).
Can you push more amps through square pad than round?
No, it won't cause any significant difference on the circuit performance.
(As pointed out in comments, for an RF or high-voltage application you might need to consider more carefully before using this method of orientation marking)
answered 4 hours ago
The PhotonThe Photon
84.9k397196
$endgroup$
This is to identify which pin is "pin 1".
In the case of a single-row header with no orientation key, this might not really matter, but the layout tool might do this by default and the designer didn't think to turn it off.
If this were to be used with a connector that does have an orientation key, I'd much rather also have a pin 1 indicator in silkscreen, so that the orientation can be checked after the connector is loaded (and without having to flip the board over).
Can you push more amps through square pad than round?
No, it won't cause any significant difference on the circuit performance.
(As pointed out in comments, for an RF or high-voltage application you might need to consider more carefully before using this method of orientation marking)
answered 4 hours ago
The PhotonThe Photon
84.9k397196
edited 4 hours ago
answered 4 hours ago
The PhotonThe Photon
84.9k397196
answered 4 hours ago
The PhotonThe Photon
84.9k397196
answered 4 hours ago
The PhotonThe Photon
84.9k397196
84.9k397196
4
$begingroup$
@Hearth On RF/high speed circuits sharp angles might act as antennas, so the trace and pad shapes do make difference.
$endgroup$
– Eugene Sh.
4 hours ago
2
$begingroup$
@EugeneSh. Well, maybe I consider RF circuitry to be "very strange". I can't imagine anyone would use 100mil pin headers in anything RF, anyway.
$endgroup$
– Hearth
4 hours ago
2
$begingroup$
And in a high-voltage circuit the sharp corners can concentrate fields. But hopefully nobody is using unshrouded headers for high voltage.
$endgroup$
– The Photon
4 hours ago
1
$begingroup$
What mil stands for? @EugeneSh.
$endgroup$
– SilvioCro
4 hours ago
4
$begingroup$
@SilvioCro 1 mil = 0.001 inch. It's a very common unit for Americans doing board design, roughly equal to 0.025 mm.
$endgroup$
– The Photon
4 hours ago
|
show 16 more comments
4
$begingroup$
@Hearth On RF/high speed circuits sharp angles might act as antennas, so the trace and pad shapes do make difference.
$endgroup$
– Eugene Sh.
4 hours ago
2
$begingroup$
@EugeneSh. Well, maybe I consider RF circuitry to be "very strange". I can't imagine anyone would use 100mil pin headers in anything RF, anyway.
$endgroup$
– Hearth
4 hours ago
2
$begingroup$
And in a high-voltage circuit the sharp corners can concentrate fields. But hopefully nobody is using unshrouded headers for high voltage.
$endgroup$
– The Photon
4 hours ago
1
$begingroup$
What mil stands for? @EugeneSh.
$endgroup$
– SilvioCro
4 hours ago
4
$begingroup$
@SilvioCro 1 mil = 0.001 inch. It's a very common unit for Americans doing board design, roughly equal to 0.025 mm.
$endgroup$
– The Photon
4 hours ago
4
4
$begingroup$
@Hearth On RF/high speed circuits sharp angles might act as antennas, so the trace and pad shapes do make difference.
$endgroup$
– Eugene Sh.
4 hours ago
$begingroup$
@Hearth On RF/high speed circuits sharp angles might act as antennas, so the trace and pad shapes do make difference.
$endgroup$
– Eugene Sh.
4 hours ago
2
2
$begingroup$
@EugeneSh. Well, maybe I consider RF circuitry to be "very strange". I can't imagine anyone would use 100mil pin headers in anything RF, anyway.
$endgroup$
– Hearth
4 hours ago
$begingroup$
@EugeneSh. Well, maybe I consider RF circuitry to be "very strange". I can't imagine anyone would use 100mil pin headers in anything RF, anyway.
$endgroup$
– Hearth
4 hours ago
2
2
$begingroup$
And in a high-voltage circuit the sharp corners can concentrate fields. But hopefully nobody is using unshrouded headers for high voltage.
$endgroup$
– The Photon
4 hours ago
$begingroup$
And in a high-voltage circuit the sharp corners can concentrate fields. But hopefully nobody is using unshrouded headers for high voltage.
$endgroup$
– The Photon
4 hours ago
1
1
$begingroup$
What mil stands for? @EugeneSh.
$endgroup$
– SilvioCro
4 hours ago
$begingroup$
What mil stands for? @EugeneSh.
$endgroup$
– SilvioCro
4 hours ago
4
4
$begingroup$
@SilvioCro 1 mil = 0.001 inch. It's a very common unit for Americans doing board design, roughly equal to 0.025 mm.
$endgroup$
– The Photon
4 hours ago
$begingroup$
@SilvioCro 1 mil = 0.001 inch. It's a very common unit for Americans doing board design, roughly equal to 0.025 mm.
$endgroup$
– The Photon
4 hours ago
|
show 16 more comments
$begingroup$
Not a standard, but it's useful to mark where pin 1 is. This might be useful if you don't have a silkscreen, but you wish to mark the orientation of the socket.
answered 4 hours ago
awjloganawjlogan
3,64211328
$endgroup$
$begingroup$
But in case with Arduino Nano(for example), it doesn't help.
$endgroup$
– SilvioCro
4 hours ago
1
$begingroup$
@SilvioCro Why not? Looking at a picture of the Nano (and some knockoffs), the TX1 pin is usually square, so you could work out the orientation based on that.
$endgroup$
– awjlogan
4 hours ago
$begingroup$
@SilvioCro, It is a common practice, most PCB software / manufacturer prefer this and since it doesn't change much electronically (except RF), it is fine to just add it
$endgroup$
– Electric_90
3 hours ago
add a comment |
$begingroup$
Not a standard, but it's useful to mark where pin 1 is. This might be useful if you don't have a silkscreen, but you wish to mark the orientation of the socket.
answered 4 hours ago
awjloganawjlogan
3,64211328
$endgroup$
$begingroup$
But in case with Arduino Nano(for example), it doesn't help.
$endgroup$
– SilvioCro
4 hours ago
1
$begingroup$
@SilvioCro Why not? Looking at a picture of the Nano (and some knockoffs), the TX1 pin is usually square, so you could work out the orientation based on that.
$endgroup$
– awjlogan
4 hours ago
$begingroup$
@SilvioCro, It is a common practice, most PCB software / manufacturer prefer this and since it doesn't change much electronically (except RF), it is fine to just add it
$endgroup$
– Electric_90
3 hours ago
add a comment |
$begingroup$
Not a standard, but it's useful to mark where pin 1 is. This might be useful if you don't have a silkscreen, but you wish to mark the orientation of the socket.
answered 4 hours ago
awjloganawjlogan
3,64211328
$endgroup$
Not a standard, but it's useful to mark where pin 1 is. This might be useful if you don't have a silkscreen, but you wish to mark the orientation of the socket.
answered 4 hours ago
awjloganawjlogan
3,64211328
answered 4 hours ago
awjloganawjlogan
3,64211328
answered 4 hours ago
awjloganawjlogan
3,64211328
answered 4 hours ago
awjloganawjlogan
3,64211328
3,64211328
$begingroup$
But in case with Arduino Nano(for example), it doesn't help.
$endgroup$
– SilvioCro
4 hours ago
1
$begingroup$
@SilvioCro Why not? Looking at a picture of the Nano (and some knockoffs), the TX1 pin is usually square, so you could work out the orientation based on that.
$endgroup$
– awjlogan
4 hours ago
$begingroup$
@SilvioCro, It is a common practice, most PCB software / manufacturer prefer this and since it doesn't change much electronically (except RF), it is fine to just add it
$endgroup$
– Electric_90
3 hours ago
add a comment |
$begingroup$
But in case with Arduino Nano(for example), it doesn't help.
$endgroup$
– SilvioCro
4 hours ago
1
$begingroup$
@SilvioCro Why not? Looking at a picture of the Nano (and some knockoffs), the TX1 pin is usually square, so you could work out the orientation based on that.
$endgroup$
– awjlogan
4 hours ago
$begingroup$
@SilvioCro, It is a common practice, most PCB software / manufacturer prefer this and since it doesn't change much electronically (except RF), it is fine to just add it
$endgroup$
– Electric_90
3 hours ago
$begingroup$
But in case with Arduino Nano(for example), it doesn't help.
$endgroup$
– SilvioCro
4 hours ago
$begingroup$
But in case with Arduino Nano(for example), it doesn't help.
$endgroup$
– SilvioCro
4 hours ago
1
1
$begingroup$
@SilvioCro Why not? Looking at a picture of the Nano (and some knockoffs), the TX1 pin is usually square, so you could work out the orientation based on that.
$endgroup$
– awjlogan
4 hours ago
$begingroup$
@SilvioCro Why not? Looking at a picture of the Nano (and some knockoffs), the TX1 pin is usually square, so you could work out the orientation based on that.
$endgroup$
– awjlogan
4 hours ago
$begingroup$
@SilvioCro, It is a common practice, most PCB software / manufacturer prefer this and since it doesn't change much electronically (except RF), it is fine to just add it
$endgroup$
– Electric_90
3 hours ago
$begingroup$
@SilvioCro, It is a common practice, most PCB software / manufacturer prefer this and since it doesn't change much electronically (except RF), it is fine to just add it
$endgroup$
– Electric_90
3 hours ago
add a comment |
$begingroup$
It is there to mark the location of a specific pin (mostly pin 1). It helps in deciding the orientation in which a component should be placed.
No you can't push more amps through the square pad. Check to see if the trace running to that pad is wider than the other traces, if not than it is similar to the others.
The square pad doesn't make a electronic difference when compared to round pads.
answered 4 hours ago
Electric_90Electric_90
714117
$endgroup$
add a comment |
$begingroup$
It is there to mark the location of a specific pin (mostly pin 1). It helps in deciding the orientation in which a component should be placed.
No you can't push more amps through the square pad. Check to see if the trace running to that pad is wider than the other traces, if not than it is similar to the others.
The square pad doesn't make a electronic difference when compared to round pads.
answered 4 hours ago
Electric_90Electric_90
714117
$endgroup$
add a comment |
$begingroup$
It is there to mark the location of a specific pin (mostly pin 1). It helps in deciding the orientation in which a component should be placed.
No you can't push more amps through the square pad. Check to see if the trace running to that pad is wider than the other traces, if not than it is similar to the others.
The square pad doesn't make a electronic difference when compared to round pads.
answered 4 hours ago
Electric_90Electric_90
714117
$endgroup$
It is there to mark the location of a specific pin (mostly pin 1). It helps in deciding the orientation in which a component should be placed.
No you can't push more amps through the square pad. Check to see if the trace running to that pad is wider than the other traces, if not than it is similar to the others.
The square pad doesn't make a electronic difference when compared to round pads.
answered 4 hours ago
Electric_90Electric_90
714117
edited 4 hours ago
answered 4 hours ago
Electric_90Electric_90
714117
answered 4 hours ago
Electric_90Electric_90
714117
answered 4 hours ago
Electric_90Electric_90
714117
714117
add a comment |
add a comment |
$begingroup$
It indicates the location of pin 1
answered 4 hours ago
uglyoldbobuglyoldbob
1195
$endgroup$
add a comment |
$begingroup$
It indicates the location of pin 1
answered 4 hours ago
uglyoldbobuglyoldbob
1195
$endgroup$
add a comment |
$begingroup$
It indicates the location of pin 1
answered 4 hours ago
uglyoldbobuglyoldbob
1195
$endgroup$
It indicates the location of pin 1
answered 4 hours ago
uglyoldbobuglyoldbob
1195
answered 4 hours ago
uglyoldbobuglyoldbob
1195
answered 4 hours ago
uglyoldbobuglyoldbob
1195
answered 4 hours ago
uglyoldbobuglyoldbob
1195
1195
add a comment |
add a comment |
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