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Electronics Production Specialist Since 1973


Tooling Specification Sheets: Instructions For Specification Data Sheets

Quad Pack Specification Data Sheet 
Flat Pack Specification Data Sheet 

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

A.  Stand-Off/PCB Offset Height - This dimension can vary and may sometimes include clearance for a heat sink. On the forming tool, this dimension is adjustable with a micrometer. Usual tolerance is ± .002.

BShoulder - This is only noted on our Universal spec sheets. It is the distance from the body of the device to thevertical tangent of the first bend, "G." This dimension is critical and size range depends on body type and lead thickness. For instance, the "B" dimension for ceramic parts can be as small as .030" and for plastic parts could be as low as .010". Metal Glass Seal parts will require a substantially larger "B" dimension. A suitable should dimension is often a judgement call based on therequired footprint vs. part size and type.

CLead Material Thickness - This is the total thickness including plating (and tinning, if applicable). 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"±).

DTip-to-Tip - This is the required 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 - This is the total foot length that will encounter solder, measured from the tip to the virtical tangent. Tolerance here is ± .005". This dimension typically ranges from .030" to .060".

      Foot Option #2 - This represents the JEDEC method of specifying this dimension. As is the case with Foot Option #1, tolerance is normally ± .005" and size range typically varies from .025" to .060".

FOverall Body Thickness - This dimension should include covers and/or heat sinks. Significant variations in this dimension within part lots can cause unacceptable variations in the final "D" dimension. Please use or send us the manufacturers case drawing to eliminate confusion.

G./H.  Upper & Lower Radii - These, as a rule, should be 1 ½ to 2 x the maximum material thickness "C". A typical tolerance range for these values is +/004-.002 or slightly greater depending on the lead thickness tolerance. Please contact us if you have any questions.

J.  Body Thickness - Vertical distance between the bottom of the lead as it exits the body and the bottom of the part body. (Refer to "F"). Specify a required tolerance.

L.  Lead Width & Pitch - This is important to set up the tooling. We need dimensions for lead width, "L", and lead pitch.

M.  Body Width - Specify a tolerance or maximum dimension.

N.  Heat Sink Width - Specify a tolerance or maximum dimension.

Y.  Body Length - Specify a tolerance or maximum dimension (Note: For two-sided flat packs only).

** Leads Per Side - Specify number. Also note required package orientation (Part ID# side up or down).

** Total Number of Leads - It's important to highlight if the part body is square or rectangular. Note: for rectangular parts, use dimension "X" and dimension "Y" on the quad sheet.

** Leads Tinned - It is important to note whether the leads have been tinned prior to forming. The "as measured" "C" dimension will thus include the tinning layer thickness.

**Lead Type - Fancort tools can be used with standard setups for flat leads. Round leads generally require more spring pressure and stepped pressure pads to reduce coining. The radius should be increased on round leads to 2 - 2 ½ x "C" and flatting within mil-spec (10%) should be expected. Please note the "B" dimension (shoulder) should be extended as much as possible. (The same as for a metal package).

** Toe Up or Down - Most customers using hot bar soldering want the toe angle to be 0° flat to 4° down. This dimension can be held fairly accurate if the "C" dimension is maintained ± .001". For customer using IR oven soldering, the typical foot position is 0° flat to 4 °toe up.

 ** Package Type -Specify whether the package is top exit, side exit or bottom exit.

For more information, contact:

Robert Antonelli
888-326-2678 x719
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