Browse Prior Art Database

Cooling Enhancement of Intel 386/486 by Clip-On Heat Sink

IP.com Disclosure Number: IPCOM000101226D
Original Publication Date: 1990-Jul-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Mansuria, MS: AUTHOR

Abstract

This article describes a clip-on heat sink arrangement for 386/486 packages which can be incorporated easily in the product.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 79% of the total text.

Cooling Enhancement of Intel 386/486 by Clip-On Heat Sink

       This article describes a clip-on heat sink arrangement
for 386/486 packages which can be incorporated easily in the product.

      386/486 microprocessors are used in personal computers (PCs).
Their performance and power consumption are expected to increase with
time.  The maximum power without a heat sink that can be dissipated
in the 486 in the PC environment is less than 3.5 W.

      A clip-on heat sink assembly kit is available commercially and
does not require socket modification. However, it prevents complete
engagement of pins in the socket because the frame (50-mil) is assem
bled between the ceramic package and the socket.  This may increase
the possibility of loose pins in the socket, and during vibration and
impact stresses the module may loosen up from the socket because the
heat sink assembly is supported by pins and the pins are not fully
engaged.  The frame body (150-mil-thick) also prevents air flow
around the module pins, module sides and heat sink bottom surface,
thus degrading the thermal perforce.

      The clip-on heat sink arrangement is shown in side view in Fig.
1.  The 486 cooling can be improved from 3.5 W without a heat sink to
6 to 12 W with a heat sink depending upon heat sink-to-ceramic
interface (grease, metal-filled polymer or dry).  This arrangement
requires modification of currently available sockets.  The socket
width and length are increased by 100 m...