PCB Libraries Forum

Standard Components : Difference Between Gullwing or Outward L Leads

Thu, 09 Apr 2026 13:58:25 +0000

Author: Tom H
Subject: Difference Between Gullwing or Outward L Leads
Posted: 09 Apr 2026 at 1:58pm

Certain small Surface Mountcomponents, such as some SOD’s and SOTs for example, with terminal leads thatcan be in the form of either Gullwing or Outward flat ‘L’depending on their dimensions.

It’simportant to distinguish between the two to assign the correct protrusion goals(toe, heel and side) to obtain the most reliable footprint mounting.

This ishow the PCBL Footprint Expert does it.

Gullwing terminalsare generally for parts with relatively larger terminals and provide more heel fillet.

Gullwing goals should be applied when:

S min > D1 max

(L max – L min) >= 0.50 mm

Outward Flat Lterminals are generally for smaller parts and do not provide as much heel fillet.

Outward Flat L goals shouldbe applied when:

S min <= D1 max

AND

(L max – L min) < 0.50 mm

When a Gullwingchange to Outward L occurs, this message will be displayed:

Footprints / Land Patterns : 0201 Capacitor Corner Radius Pad

Wed, 08 Apr 2026 09:12:08 +0000

Author: dramos
Subject: 0201 Capacitor Corner Radius Pad
Posted: 08 Apr 2026 at 9:12am

Hi Tom and Team,

Thanks for the clarification, when you mentioned length , width I was surprised if you were referring to any of the values. I was a little bit in shock!! hahahahaha

Thanks and regards,

david

Altium : Issue Creating New Footprint in Altium Workspace

Wed, 08 Apr 2026 09:07:38 +0000

Author: dramos
Subject: Issue Creating New Footprint in Altium Workspace
Posted: 08 Apr 2026 at 9:07am

Hi,

I do not know if it could help you but when I create a new footprint using the script I save it locally and then over the new library in the projects panels, right click and choose Import Library option.

My recommendation is click Advance button and reselect where you want to save the footprint (properties panel) and then click Import button in the middle.

Perhaps it is nor really clear, if you do not find the way tell me and I will prepare something with some screenshots.

Regards,

david

Footprints / Land Patterns : 0201 Capacitor Corner Radius Pad

Wed, 08 Apr 2026 08:41:07 +0000

Author: Tom H
Subject: 0201 Capacitor Corner Radius Pad
Posted: 08 Apr 2026 at 8:41am

0402 is not 'Less than 1.00 mm'.

It looks OK with a 0.10 mm corner radius.

Watch out for excessive package tolerances.

This package is 1.00 L x 0.50 W x 0.55 H with a 0.10 tolerance on all dimensions.

Footprints / Land Patterns : 0201 Capacitor Corner Radius Pad

Wed, 08 Apr 2026 02:59:53 +0000

Author: dramos
Subject: 0201 Capacitor Corner Radius Pad
Posted: 08 Apr 2026 at 2:59am

Hi Tom and Team,

Many thanks for your fast response.

Does it mean that we should apply the same rule of thumb to 0402 case components or even 0603 components? I am thinking on resistors ...

Thanks for spreading your knowledge :)

david

Footprints / Land Patterns : 0201 Capacitor Corner Radius Pad

Tue, 07 Apr 2026 08:30:25 +0000

Author: Tom H
Subject: 0201 Capacitor Corner Radius Pad
Posted: 07 Apr 2026 at 8:30am

Rule of thumb - any package less than 1.00 mm in length or width should have 0.05 mm corner radius pads.

You can use the 'SMD Pad Stack Rules' in the side panel of the calculator to change the corner radius.

Or you can move the calculator footprint to FP Designer to permanently save the 0.05 mm corner radius to FPX library format. But we recommend that you first setup everything in the calculator before moving to FP Designer so you won't have to edit the pad stack in FP Designer.

FP Designer saves all your settings to the FPX library. You can rename the Footprint Name in the Library Editor.

Footprints / Land Patterns : 0201 Capacitor Corner Radius Pad

Tue, 07 Apr 2026 04:09:03 +0000

Author: dramos
Subject: 0201 Capacitor Corner Radius Pad
Posted: 07 Apr 2026 at 4:09am

Hi all,

I created my first 0201 capacitor and I feel that using a Corner Radius Size Limit parameter= 0.10 mm could be "risky" (I used Fab Tol= 0, Placement Tol=0).

I know that some manufacturers use 0.05 mm.

My component is GRM033R61C104KE14D from Murata

Which is your recommendation for this tiny component sizes?

Waiting for your comments.

David

Questions & Answers : How To Choose the Footprint for SMD Chip Resistor

Mon, 23 Mar 2026 08:46:09 +0000

Author: Tom H
Subject: How To Choose the Footprint for SMD Chip Resistor
Posted: 23 Mar 2026 at 8:46am

Here is the original EIA PDP-100 Chip Package dimensions and tolerances.

https://www.pcblibraries.com/Forum/chips_topic3598.html

Compare with IEC.

Questions & Answers : How To Choose the Footprint for SMD Chip Resistor

Mon, 23 Mar 2026 00:58:01 +0000

Author: Ariel_Levy
Subject: How To Choose the Footprint for SMD Chip Resistor
Posted: 23 Mar 2026 at 12:58am

Tom thank you very much

and thank you Feynman

My difficulty is in obtaining information the thickness of the contacts size of the component (the size "T")

I bought the IPC-7351 and 7352. and you don't have information about this.

I think to buy EIA-JEP95 , and don't know it's worth the money if very MFG design is contacts size what "he" want's.

This table i found is accurate?

How you handle this with general discrete components ,when the contacts size can be between 0.10 to 0.40?

With the IPC-7351 when contacts size is 0.4 mm?

Questions & Answers : How To Choose the Footprint for SMD Chip Resistor

Sun, 22 Mar 2026 10:14:58 +0000

Author: feynman
Subject: How To Choose the Footprint for SMD Chip Resistor
Posted: 22 Mar 2026 at 10:14am

Ask a/your assembler. They probably assembled millions of parts and are probably the best source for a reliable footprint.