|
|
Explanation of Naming Convention |
Post Reply 
|
| Author | |
chads108 
Active User 
Joined: 17 Oct 2012 Location: Plano, TX Status: Offline Points: 35 |
 Post Options
 Thanks(0)
 Quote Reply
 Topic: Explanation of Naming ConventionPosted: 17 Sep 2014 at 1:49pm |
|
I just created a footprint for a SOT23 and the resulting footprint name suggested is SOT95P230X120-3L18N. I understand everything in that name except the L18 part. I am assuming it is some reference to a dimension, but I sure can't figure it out in looking at the datasheet. What is that referring to? |
|
 |
|
|
|
|
Tom H
Admin Group 
Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5716 |
Post Options
Thanks(0)
Quote Reply
Posted: 17 Sep 2014 at 1:57pm |
|
You have the "Extended Footprint Names" turned on in User Preferences. The L18 = the Lead Tolerance for a Gull Wing lead form. The lead tolerance impacts the pad length. A lead tolerance of 0.18 mm is good, but some Gull Wing leads have a tolerance of 0.60 mm to 0.90 mm and that makes a big difference in the pad length. Without the extended names for gull wing, the IPC-7351 calculator would auto-generate a duplicate footprint name even though the pad lengths could vary in length. I'll bring this to the attention of the IPC-7351 land pattern committee on Wednesday October 1st in Chicago, IL. |
|
|
|
|
Post Reply
|
|
| Tweet |
| Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |
Topic Options