951 Bergquist, 951 Datasheet - Page 15

• Manufacturer Part Number: 951
• Description: THERMAL PAD TO-220 .009" SP1000
• Manufacturer: Bergquist
• Series: Sil-Pad® 1000r

Specifications of 951

• Usage: TO-220
• Shape: Rectangular
• Outline: 19.05mm x 12.70mm
• Thickness: 0.009" (0.229mm)
• Backing, Carrier: Fiberglass
• Color: Pink
• Thermal Resistivity: 0.35°C/W
• Thermal Conductivity: 1.2 W/m-K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Adhesive: -
• Other names: 951; BER199

Base Thickness
Copper and aluminum Thermal Clad is normally purchased in one of
the standard-gauge thicknesses shown in the table below. Non-stan-
dard thicknesses are also available.
Electrical Connections To Base Plate
If a connection to the base plate is desired, copper is the most com-
patible base layer to use. When using electrical or thermal vias, it is
important to match the circuit and base coefficients of thermal TCE
expansion as closely as possible. Otherwise, excess plated-hole stress
will occur during thermal cycles. Other base layer materials can be
used for connection, but will require different connection schemes.
Costs
The most cost effective base layers are aluminum and copper
because they represent industry standards. Copper is more expensive
than aluminum when comparing the like thicknesses, but can be the
less expensive option if design considerations allow for a thinner layer.
As an example, typically the cost of 0.040" (1.0mm) copper is equal
to the cost of 0.125" (3.2mm) aluminum.
Aluminum - Thicknesses
Copper - Thicknesses
*Standard thicknesses highlighted
Inches
Inches
0.020
0.040
0.062
0.080
0.125
0.040
0.080
0.125
0.032
0.160
0.190
0.020
0.032
0.060
Millimeters
Millimeters
0.51
0.81
1.02
1.57
2.03
3.18
4.06
4.83
0.50
0.81
1.02
1.52
2.03
3.18
Surface Finish
Aluminum and copper base layers come with a uniform commercial
quality brushed surface. Aluminum is also available anodized with
choices of clear, black, blue and red colors.
Standard Thermal Clad Panels
Available in:
• 18" (457mm) x 24" (610mm)
• 18" (457mm) x 25" (635mm)
• 20" (508mm) x 24" (610mm)
Usable area: 17" (432mm) x 23" (584mm)
Usable area: 17" (432mm) x 24" (610mm)
Usable area: 19" (483mm) x 23" (584mm)
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