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Butt connector

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SMTA-Davandran

#83579

Butt connector | 15 October, 2019

I seeing connector with butt (I) lead drop off after drop test conducted. the current shear force is about 3kgf. How can this problem improved.

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#83583

Butt connector | 15 October, 2019

From J-STD-001: Components designed for pin-in-hole application and modified for butt connection attachment, or stiff-leaded dual-inline packages (e.g., alloy 42, brazed or tempered leads) may be modified for use on Class 1 and 2 products but shall not [N1N2D3] be used on Class 3 products.

But you know that.

If I had to solder butt leads, I'd keep opening my stencil apertures and not stop until the fillet reached just below the package body. Until I found that opening, I'd give a knitter a paste dispenser to lay a bead along each side of the component and then reflow.

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SMTA-Davandran

#83616

Butt connector | 19 October, 2019

Dear Dave, Thank you for your advice on this issue. Shall butt connector withstand high mechanical strength after increase paste volume.

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#83619

Butt connector | 19 October, 2019

Hi Davandran ... Butt leads are not intended for high mechanical strength applications. That's why butt leads are not allowed in Class 3 products.

If you want to be sure that your butt leaded component stays on the board, just glue it after soldering & cleaning and before stress testing.

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