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Tooling Specification Sheets:  Instructions For Specification Data Sheets

Quad Pack Specification Data Sheet (PDF)
Flat Pack Specification Data Sheet (PDF)

The following is a guide to help you fill out our quad pack and flat pack spec sheets. Please call us if you need further information or technical assistance.

A.  Stand-Off/PCB Offset Height - This dimension is usually .015 for military and aerospace applications, or may sometimes include clearance for a heat sink. On the tool, this dimension is adjustable with a micrometer, usual tolerance is ± .002.

B.  Shoulder - This is only noted on our Universal spec sheets. It is a reference from the body of the device to the first bend. Note: This dimension is critical, and should be .035" or greater depending on lead thickness.

C.  Lead Material Thickness - Is the total thickness including plating. This is a very critical dimension and enormously effects spring-back, foot position, burnish (on the leg) and your tip-to-tip "D" tolerance. The smaller range the better. Usual tolerance here is ± .002, ideal is .001±.

D.  Tip-to-Tip - This is the actual size of the device after form and trim. This dimension includes spring back and cumulative tolerance. Usual tolerance here is ± .010.

E.  Foot Option #1 - Is the total foot length that will encounter solder tolerance here is ± .005, minimum size here is about .040.

      Foot Option #2 - is the JEDEC style of measuring. This is a more accurate way of specifying this dimension. Typical dimension here is .025 and the tolerance should be ± .005.

F.  Overall body thickness should include covers and or heat sinks. Please use or send us the manufacturers case drawing to eliminate confusion.

G./H.  Radius upper and lower - These as a rule should be 1 ½ x your max material thickness "C". The max here should be about 2 x "C".

J.  Bock Thickness under the lead. Refer to "F". We need a tolerance here of ± .005.

K./L.  Lead Pitch - This is important to lay out the tool. We need to know the pitch and total pin counts per side, as well as the manufacturer's lead frame drawings. Also, the width of the lead "L" is equally important.

M.  Lower Tab - Note, for small flat packs only.

N.  Body Width - Hopefully ± .007.

O.  Body Length - Note: For two-sided flat packs only. Leads per side. Also if package orientation (up or down) is important.

*     Total # of leads - It's important to highlight if this is square or rectangular. Note, for rectangular, use dimension "X" and dimension "Y" on the quad sheet.

      Leads Tinned - Is important to note and be sure to add this tolerance range and thickness to your "C" dimension.

      Metal with glass seals requires a much greater shoulder "B" dimension. Ceramic can be as low as .030, and plastic parts might be acceptable down to .010 ref. or a .017 typical range.

      Lead Type - Flat leads are standard to our tools. Round leads generally require more spring pressure and stepped pressure pads to reduce coining. The radius should be increased on round leads to 2 X's - 2 ½ X "C" and flatting within mil-spec (10%) should be expected. Please note the "B" dimension should be extended as much as possible. (The same as with a metal package).

      Toe Up or Down - As we have been lead to believe, most customers using hot bar soldering want the toe's 0° flat to 2° toe down. This dimension can be held fairly accurate if the "C" dimension is maintained ± .001. For customer doing IR oven the typical foot position has been 0° flat to 2°toe up.

      Package Type - Top braze, side exit and bottom exit are important to produce consistent "D" tip-to-tip dimensions of ± .005. If a top brazed and bottom brazed are to be used in the same tool, the tip-to-tip tolerance should be +.020 maximum ± .015 minimum.