Replies to this message

Re: IPC standard for soldering LPCC IC
Re: IPC standard for soldering LPCC IC -- totoro	Post Reply	Top of thread	Forum

Posted by: Kelly Bramble ® 12/14/2006, 09:19:45 Author Profile eMail author Edit

I don't have a copy of the IPC standard, however I do have MIL-STD-2000. My reference show that you are not allowed more or less than 15 degrees between the formed lead placement and the pad. I'm also showing that direct physical contact is required. Virtually all chip/component carriers seem to allow for some offsett, however no tilr beyonf 15 degrees. This the best I got... Are you bound to the IPC standard on this project/product? Modified by Kelly Bramble at Thu, Dec 14, 2006, 09:20:16

Post Reply Tell a Friend (must be logged in) Alert Admin About Post

Where am I? Original Top of thread

| |

Re: Re: IPC standard for soldering LPCC IC
Re: Re: IPC standard for soldering LPCC IC -- Kelly Bramble	Post Reply	Top of thread	Forum

Posted by: Kelly Bramble ® 12/14/2006, 09:28:21 Author Profile eMail author Edit

Additional information: If you are mounting some sort of power amp or other device that needs to move heat energy, then no gap will be allowed between the thermal pad area and the device. There will also be minimum clearance rquirments between the thermal pad area and the solder mask. Ultimately, all of this is designed onto the PWB per your driving specification or your components recommended installation information.

Post Reply Tell a Friend (must be logged in) Alert Admin About Post

Where am I? Original Top of thread

| |

Re: Re: Re: IPC standard for soldering LPCC IC
Re: Re: Re: IPC standard for soldering LPCC IC -- Kelly Bramble	Post Reply	Top of thread	Forum

Posted by: totoro ® 12/15/2006, 02:13:39 Author Profile eMail author Edit

the LPCC device that is in concern is an amplifier IC, and heat dissipation and grounding is crucial. However, there is no valid standard to refer to, in order to reject the tilted IC with any visual acceptable standard. this is sometimes too hard to negotiate with suppliers who is strictly accept only the rejects which is not compliance to the IPC standard.

Post Reply Tell a Friend (must be logged in) Alert Admin About Post

Where am I? Original Top of thread

| |

Re: Re: Re: Re: IPC standard for soldering LPCC IC
Re: Re: Re: Re: IPC standard for soldering LPCC IC -- totoro	Post Reply	Top of thread	Forum

Posted by: Kelly Bramble ® 12/16/2006, 08:11:26 Author Profile eMail author Edit

The leadless chip carrier and amp IC manufacturer should installation design suggestions and requirements. Without a valid industry specification that how I would defend my design and installtion.

Post Reply Tell a Friend (must be logged in) Alert Admin About Post

Where am I? Original Top of thread