Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Flex PCB reflow thermal profile

Status
Not open for further replies.

buenos

Advanced Member level 3
Joined
Oct 24, 2005
Messages
956
Helped
40
Reputation
82
Reaction score
21
Trophy points
1,298
Location
Sunnyvale, California, USA
Activity points
9,073
What temperature should I use for reflowing components on a flex polyimide PCB?
Some people say it has to be colder than the usual rigid board temperature, but I cannot find any websites where they state the exact temperature values or where they show a thermal profile for the reflow oven.
 

buenos

Advanced Member level 3
Joined
Oct 24, 2005
Messages
956
Helped
40
Reputation
82
Reaction score
21
Trophy points
1,298
Location
Sunnyvale, California, USA
Activity points
9,073
Thanks.
The presentation shows profiles going up to 230-240C. I think normal reflow for rigid goes up to 260C.
 

FvM

Super Moderator
Staff member
Joined
Jan 22, 2008
Messages
48,266
Helped
14,224
Reputation
28,709
Reaction score
12,917
Trophy points
1,393
Location
Bochum, Germany
Activity points
279,523
Polyimide itself has higher temperature strength than expoxy. It's the lower board thickness and respective lower heat capacity that makes the difference. The critical point is the maximum component temperature during reflow, I expect that package sizes and reflow method heating method matters for the profile.
 

buenos

Advanced Member level 3
Joined
Oct 24, 2005
Messages
956
Helped
40
Reputation
82
Reaction score
21
Trophy points
1,298
Location
Sunnyvale, California, USA
Activity points
9,073
The PCB fab told me that the material they use (PI-FCCL) can be reflowed up to 260-289C. Although I cannot find this info in the datasheet. All it says "300C for 10sec = OK"
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top