Browse Prior Art Database

DCAP Reflow-Test-VI Boat (RTV Boat)

IP.com Disclosure Number: IPCOM000037678D
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Meranda, KW: AUTHOR

Abstract

A terminal metal process typically includes a first reflow, electrical test, a second reflow, and final visual inspection. This article describes a product carrier called an RTV boat which allows all four operations to be carried out on individual chips without removing the chips from the carrier.

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DCAP Reflow-Test-VI Boat (RTV Boat)

A terminal metal process typically includes a first reflow, electrical test, a second reflow, and final visual inspection. This article describes a product carrier called an RTV boat which allows all four operations to be carried out on individual chips without removing the chips from the carrier.

After the RTV boat has been batch loaded with 64 chips from the terminal metal evaporation fixtures, the boats are run through the reflow oven for the first reflow. To remain within the 0.125 inch reflow envelope in the oven, the boats are 0.100 inch thick. The positioning within the pockets of the chips is not critical to the reflow operation. The boat material was chosen to be copper impregnated graphite to withstand the 360oC reflow temperature without material deformation.

Next, the chips are positioned in the upper right corner of each pocket to prepare for electrical test. The pockets are registered in the X and Y - directions to 0.0005 of an inch to assure proper C-4 pad to proble alignment as the boat is stepped by the electrical test apparatus. In addition, vacuum ports through the bottom of each pocket hold the chip in place during electrical test.

The chips go through the second reflow without requiring a carrier transfer. The processing for the second reflow is very similar to that for the first reflow.

The chips are ready for visual inspection. No transfer to a second carrier is necessary to perform this step.

The RTV boa...