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Friday, April 1, 2016
PCB Libraries Footprints - SOICs Leads
When using PCB Libraries you can easily customize your PCB Footprints.
SOIC example:
It is not uncommon for IPC 7351 default SOICs footprints to have pads that extend under the body of the gull wing ICs as shown below,
My contract manufacturer and SMT line expert prefers SOIC footprints with pads that do NOT extend under the body of parts, as shown below.
PCB Libraries allows users to customize and save preferences for generating footprints. One of the settings under User Preferences > Rules is 'Minimum Trim Standoff Height'.
Out of the box the default 'Minimum Trim Standoff Height' is 0.00. I changed this setting to 0.30 to achieve the results shown above for SOICs.
I use PCB Libraries Expert IPC-7351 footprint generator to make my PCB footprints.
That's It !
SOIC example:
It is not uncommon for IPC 7351 default SOICs footprints to have pads that extend under the body of the gull wing ICs as shown below,
My contract manufacturer and SMT line expert prefers SOIC footprints with pads that do NOT extend under the body of parts, as shown below.
PCB Libraries allows users to customize and save preferences for generating footprints. One of the settings under User Preferences > Rules is 'Minimum Trim Standoff Height'.
Out of the box the default 'Minimum Trim Standoff Height' is 0.00. I changed this setting to 0.30 to achieve the results shown above for SOICs.
I use PCB Libraries Expert IPC-7351 footprint generator to make my PCB footprints.
That's It !
No Clean Flux Problems
Tacky
Substance Under Zero Clearance Parts
"We are having failures with large, flush sitting components. When we remove the parts we find a tacky substance. Is this residue common?"
Source: Circuit Net
"We are having failures with large, flush sitting components. When we remove the parts we find a tacky substance. Is this residue common?"
Source: Circuit Net
How To Select a Capacitor - Octopart Blog
How To Select a Capacitor - Octopart Blog:
"How To Select a Capacitor BY SANKET GUPTA · MARCH 23, 2016"
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"How To Select a Capacitor BY SANKET GUPTA · MARCH 23, 2016"
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