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Heel bend wetting for Gull Wing lead

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ray

#48980

Heel bend wetting for Gull Wing lead | 11 April, 2007

Dear Friend, I appreciate some one can give some opinion regarding IPC-A-610D, 8.2.5.4 Gull wing minimum side joint length (D)requirement for lead > 3W. Figure 8-84 shown evidence of heel bend wetting(but no written criteria mention about the solder fillet must present at the heel bend). It is acceptable if the minimum D(3W/75%L)extend from toe which is no evidence of solder fillet at heel bend?

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#49005

Heel bend wetting for Gull Wing lead | 12 April, 2007

On one hand, nothing in 8.2.5.4 that states that you need a heel fillet. It only talks to the length of the side fillet. On the other hand, we suggest that you should use 8.2.5.6 to determine if your heel fillet is acceptable, after you have determined the accptability of the side fillet.

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ray

#49007

Heel bend wetting for Gull Wing lead | 12 April, 2007

If the solder joint meeting 8.2.5.4, minimum side joint length(D) and also meeting 8.2.5.6, minimum heel fillet height (F) but the heel fillet NOT extend to the mid point of outside bend. It is acceptable?

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#49009

Heel bend wetting for Gull Wing lead | 12 April, 2007

We'd say yes, if it meets both 8.2.5.4 and 8.2.5.6

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ray

#49014

Heel bend wetting for Gull Wing lead | 13 April, 2007

Davef, Thanks for your reply. Also sorry because I didint notice your ealier reply on http://www.smtnet.com/Forums/Index.cfm?CFApp=1&Message_ID=48991 regarding the normal gull wing lead, the solder fillet must extend to the mid point of outside lead bend. Just to confirm solder fillet at midpoint of outside lead bend is a must? Appreciate you can clarify my doubt. Thanks.

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#49025

Heel bend wetting for Gull Wing lead | 13 April, 2007

Your paste should meet the mid-point of outside lead bend. If you cannot meet that, IPC-A-610D, 8.2.5.6 defines the minimum.

We agree that it gets confusing when you post multiple threads on the same or very similar topic.

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