Anchors (left photo) are mounted to the PCB. QSZ clips (right photo) secure the heat sink to the anchors. The PCB thickness and anchor pitch dimensions will vary for each board/layout. Please use the following guidelines to choose the appropriate QSZ clip, Anchor, and Heatsink for your application.
Small PCB Area
Mounting pins only require 1.8mm[.071"] diameter holes in the PCB. Small footprint greatly reduces the amount of PCB space sacrificed for heat sink attachment, minimizing or eliminating the need to move board traces.
During heat sink installation, traditional Z-Clips may require the heat sink to be slightly twisted or tilted in order for the clip to engage with the board mounted anchor. This could possibly damage any pre-applied thermal interface material or even the device package or exposed die. The QSZ clip can be installed without requiring any twisting or tilting of the heat sink.
Location and Orientation Guide
If a heat sink is accidentally installed in the wrong orientation relative to the airflow direction, this could result in serious thermal issues. The heat sink layout can be designed to incorporate anchor pin locations inside the heat sink footprint. The anchor pins would have to pass through holes in the heat sink, ensuring proper orientation.
Minimize bare-die damage during heat sink installation
Exposed dies can be damaged if the heat sink attachment load is applied to the edges or corners of the die. This can happen if the heat is tilted during installation. If the anchor pins are located inside of the heat sink footprint, they will act as guides when the heat sink is installed. The tight clearance between the anchor pins and the clearance holes will greatly reduce the ability of the heat sink to tip or tilt during installation, preventing contact with the edges or corners of the die.
1. Align the heat sink with the chip and anchor pins.
1-1. Confirm that the anchor pin is fully inserted.
2. Gently place the heatsink on the top of the chip.
3. Attach one end of the clip’s hook plate to the
anchor pin. Attach the hook plate by bringing it in
from the outside and locking it into the pin.
(follow arrow direction)
4. While applying light pressure to the heat sink to keep it level, lock in the hook plate on the opposite side.
4-1. Detail of locking procedure:Push the hook plate down.
4-2. Slide the hook plate in, toward the anchor pin. Make sure the hook plate slides in under the anchor pin head. Release the hook plate, locking it in place. Inspect the hook plate and pin head to ensure the hook plate is firmly seated and locked.
The following is a list of our standard QSZ clips.
Please try to use one of these standard patterns.
If necessary, a custom clip layout can be created.
These specifications should be treated as reference guidelines.
Please install the selected heat sink, anchor pin, and QSZ clip combination on
your board to ensure that the anchor locations will work with your application.
For corporate customers, we can produce custom clips.
Please check QSZ Clip Design Request for details.
||Anchor Pin Layout
X x Y (mm)
|QSZ24X24||24 x 24||DXF||
|QSZ29X29||29 x 29||DXF|
|QSZ34X34||34 x 34||DXF|
|QSZ39X39||39 x 39||DXF||STEP||IGES|
|QSZ44X44||44 x 44||DXF||STEP||IGES|
|QSZ49X49||49 x 49||DXF||STEP||IGES|
|QSZ54X54||54 x 54||DXF||STEP||IGES|
|QSZ64X64||64 x 64||DXF||STEP||IGES|
|QSZ24X24R||24 x 24||DXF|
|QSZ29X29R||29 x 29||DXF|
|QSZ34X34R||34 x 34||DXF|
|QSZ39X39R||39 x 39||DXF||STEP||IGES|
|QSZ44X44R||44 x 44||DXF||STEP||IGES|
|QSZ49X49R||49 x 49||DXF||STEP||IGES|
|QSZ54X54R||54 x 54||DXF||STEP||IGES|
|QSZ58X58R||58 x 58||DXF||STEP||IGES|
|QSZ64X64R||64 x 64||DXF||STEP||IGES|
We currently offer five standard anchor pin lengths.
The pin length can be used with different PCB thicknesses and chip heights to adjust the clip attachment force.
Anchor pins remain captive to the PCB, with no solder required.
This table shows whether a clip can be used with a particular
heat sink. Depending on the fin pattern and orientation, the clip may
not be able to be installed to the exact center.
Please consult select a heat sink
to determine if thermal requirements will be met.
Explanation of this table:
With the V type, the center of the QSZ clip runs
perpendicular to the airflow/fin direction (left photo).
The H type is parallel/inline to the airflow/fins (right photo).
Please check the airflow direction prior to pairing selection.
The clip load on the heat source can be calculated by
the following tool. Please note that this data is just
for reference. Unknown dimensions and tolerances
can significantly affect the load on the heat source.
A custom clip can be created if a standard clip will not work with your application. Please use our online
custom clip design page for this purpose. Simply enter design information and forward your request.
We will review your information and provide feedback ASAP.
© 2011 Alpha Novatech, Inc.