Surface-mount Heat Sinks for SMT Power Semiconductor Devices
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Surface-mount Heat Sinks for SMT Power Semiconductor Devices
The surface-mount heat sinks is suitable for SMT power semiconductor devices in TO 252, TO 263 packages. Their unique design removes heat indirectly through conduction without making contact with the SMT device like traditional through-hole solutions.
The semiconductor's conventional copper drain pad is modified to extend beyond the edges of the semiconductor package, providing space to mount the heat sink. The device and heat sink are soldered directly to the modified drain pad, creating a thermal transfer path from the package tab to the surface-mount heat sink. In addition, the elevated "wings" of the heat sink provide ample surface area to dissipate the heat into the surrounding environment.
When working, the high-power inverter MOS tube generates a lot of heat. If the heat dissipation effect of the MOS tube is not good, the temperature is too high and it may cause the MOS tube to burn out, which may cause the damage of the entire circuit board. Traditional high-power inverter MOS tube heat dissipation, the high-power inverter MOS tube is set on the circuit board, and the heat sink is also set on the circuit board. The MOS tube is in contact with the heat sink. When the circuit is working, the heat dissipated by the MOS tube is quickly dissipated by the heat sink.
The top of the figure below is the heat sink, and the middle is the heat conductive material, such as thermal conductive silicone grease. The heat conductive material is to allow heat to be more efficiently transferred from the power MOS to the heat sink, so as to dissipate the power MOS with maximum efficiency and reduce its temperature. The bottom is the power MOS, and each temperature point gradually decreases from bottom to top.
MOS heat sink is a device for dissipating heat from heat-prone electronic components in electrical appliances. It is mostly made of aluminum alloy, brass or bronze in the form of plates, sheets, multiple sheets, etc. For example, the CPU central processing unit in the computer needs to use a fairly large heat sink, the power tube, line tube in the TV, and the power amplifier tube in the power amplifier all need to use heat sinks.
The Benefits of Stamping Heat Sinks:
Stamped heat sinks have a major advantage due to their design and size, which is saving board space. Active components are directly screwed or bonded onto the stamped heat sink. Stamped heat sinks are available based on a horizontal or vertical design.
The Stamped Heatsink Technique offers a good approach for producing high efficiency, high aspect ratio, lightweight heatsinks in small package sizes, and is a good choice for medium to high volume production. This technique also offers a low Non Recurring engineering charge, so prototype set up costs are minimal.
Stamped heat sinks, manufactured using aluminum or copper sheets, that are stamped to create a particular shape these sinks are usually low in performance, and commonly suit low-power applications. Industry standards indicate a typical thickness of 0.4mm. Commonly, designs include 20 to 30 fins for efficient cooling. Electronics such as transistors benefit from this type.
For stamped heat sinks, different surfaces, either tin-plated or black anodized, can be chosen to improve heat dissipation and thermal performance for natural convection applications.
Aluminum is capable to handle various surface treatments with a wide range of designs and colors, making the final product look durable and attractive to be used for different devices.
The application of stamping heat sink is very extensive mainly used in industry,telecommunication,computer,consumer market or automobile industry.
Types of MOSFETs/Regulators/Transistors Heatsink Mounting
Screw fixing: This is the most common installation method, and the heat sink is fixed to the MOS tube by screws. This method is firmly installed, but screw holes need to be reserved on the circuit board, and the installation process is relatively complicated. Do not use self - tapping screws.
Clip fixing: Use a clip to clamp the heat sink to the MOS tube, which is convenient and quick to install, and does not require drilling holes on the circuit board. However, the clamping force of the clip is limited, which may affect the heat dissipation effect.
Thermal conductive adhesive pasting: Paste the heat sink to the MOS tube with thermal conductive adhesive, which is simple to install and does not require additional fixings. However, the thermal conductivity of thermal conductive adhesive may not be as good as direct contact with metal, and aging may occur after long-term use.
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