Electronics thermal management, from the board to the enclosure
Find out which components run hottest, how heat travels from the board to the outside world, and which cooling strategy, passive or active, keeps the whole product within its limits at worst-case conditions.
Thermal problems in electronics are rarely solved by one component. Heat leaves a processor or power device through its package, spreads through copper planes and vias, crosses gap pads or potting into a chassis, and finally reaches the outside air by convection and radiation. A weak link anywhere along that path shows up as a hot component, and the weak link is often some distance from where the heat is generated.
More about electronics thermal management
Electronics thermal management simulation models the complete product: boards with their copper layers, components with their package thermal resistances, interface materials, enclosure walls, internal air and the external environment. It gives the temperature of every critical part, shows how heat divides between conduction, convection and radiation, and measures how much a change of layout, material or cooling strategy is worth. Sealed enclosures, conformally coated or potted assemblies and products in direct sun are handled as readily as fan-cooled units.
Recommendations cover what changes on the board and in the enclosure: placement, copper area, thermal vias, gap pads, vents, fins or a fan.
Typical products: motor drives and inverters, battery management and charging units, outdoor telecoms and control cabinets, sealed sensors, LED drivers and industrial controllers.
What a thermal management study tells you
Which components run hottest?
Temperature of every critical component at worst-case load and ambient, ranked by margin so attention goes where it is needed.
Can the enclosure stay sealed?
Whether a sealed enclosure can reject its heat through the walls by convection and radiation alone, or needs fins, an internal fan or a heat exchanger.
Is the board spreading heat well?
How copper planes, thermal vias and component spacing carry heat away from hot devices, and where placement changes would help.
Is passive cooling enough, or is a fan worth it?
Passive designs set against fan-cooled options on component temperature, so a fan, with its power, noise and service life, is added only when it earns its place.
What happens in direct sun or at altitude?
Solar load on outdoor enclosures, and the weaker convective cooling of thinner air at altitude, at the conditions the product is specified for.
How does temperature change through a duty cycle?
Transient heating through start-up, peak load and idle, showing whether thermal mass carries the product through short power peaks.
What we model
PCB conduction
Copper layers, planes and thermal vias represented with in-plane and through-thickness conductivities, or in full detail where a local hotspot needs it.
Component models
Packages represented by their junction-to-case and junction-to-board resistances, or modelled in detail for power devices.
Sealed and potted assemblies
Conduction through potting compounds, conformal coatings, gap pads and chassis walls, with natural convection and radiation outside.
Enclosure airflow
Fans, vents, filters and internal baffles, showing recirculation, dead zones and whether air reaches the components that need it.
Radiation and solar load
Surface-to-surface radiation inside and outside the enclosure, and solar gain on products installed outdoors.
Transient behaviour
Temperatures through power cycles, start-up and ambient changes, using the thermal mass of boards, components and housing.
Thermo-structural effects
Temperature fields carried into structural analysis for board warpage, solder joint strain or enclosure distortion.
Before you start
What to send us
- CAD of the boards, enclosure and any heat spreaders (STEP or native)
- Board stack-up, or copper layer count and thickness
- Power dissipation for each significant component, by operating mode
- Component temperature limits and package thermal data
- Ambient range, mounting, solar exposure and altitude
- Fan and vent details, or the requirement that the unit stays sealed
How is this different from heat sink simulation?
A heat sink study refines one cooling component. Thermal management looks at the whole product, including board, enclosure and environment, and may conclude that a heat sink is not the best answer.
Do you need the PCB layout files?
They help for boards where copper distribution matters. Otherwise the stack-up, layer count and copper coverage are enough to represent the board well.
Can you model a completely sealed enclosure?
Yes. Heat leaves through the walls by conduction, then by natural convection and radiation outside, and the study shows whether that path is enough or what would improve it.
Can you include thermal stress on solder joints?
The temperature field can be carried into a thermal stress analysis to show solder joint strain, board warpage and stress around stiff components.
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