Publishing Venue
The IP.com Prior Art Database
Abstract
Disclosed is a method for attaching an integrated heat spreader with a pre-applied sealant adhesive. Benefits include reduced dynamic warpage of the package during thermal cycling, reduced stress on the thermal interface, and improved control of sealant placement and flow. The disclosed method is an IHS with pre-attached B-stage or solder sealant adhesive polymer dispensed on to the surface of the IHS lip for bonding the spreader to the package (see Figure 2). The sealant reduces dynamic warpage of the package during thermal cycling and reduces the stress load on the thermal interface.
Method for an integrated heat spreader with a pre-applied
sealant adhesive
Background
Silicon designs increasingly require heat removal by larger and
heavier heat sinks. An integrated heat spreader (IHS) is conventionally sealed to a package
using the following methods (see Figure 1):
1. A polymer sealant
is dispensed onto the package.
2. The IHS is picked
up, placed, and clipped on top of the package.
3. The sealant is
cured.
The
sealant reduces mechanical loading on the thermal interface material, but the
package warps during thermal cycling.
Sealant-dispensing tools reduce overall assembly line utilization and
increase assembly cost.
Description
Disclosed is a method for attaching an integrated heat spreader
with a pre-applied sealant adhesive. Benefits include reduced dynamic warpage of the package during
thermal cycling, reduced stress on the thermal interface, and improved control
of sealant placement and flow. The disclosed method is an IHS with pre-attached B-stage or solder
sealant adhesive polymer dispensed on to the surface of the IHS lip for bonding
the spreader to the package (see Figure 2). The sealant reduces dynamic warpage
of the package during thermal cycling and reduces the stress load on the
thermal interface.
Key elements of the
disclosed method include:
·
IHS with
dispensed B-stage polymer or solder sealant attached to the bottom periphery
Advantages
The IHS with pre-attached dispensed sealant eliminates the
requirement for sealant dispensing.
Dispensin...
