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Relating to temperature rise, the flow of heat, or cooling of components

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I'm really not comfortable with things heating up, including this LM7805 integrated circuit wired below. Why does this mighty LM7805 heat up? Thank you for the help!
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I know that some portion of the electrical energy is dissipated as heat due to the efficiency, but where does the other energy go? If we are talking about a satellite in space, all of the electrical ...
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Is it possible to manually wrap the thermal fuse's pins around the 'grommets' as shown in the picture? The arrows point to the two grommets, with the thermal fuse in the question across the top.
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I am in the process of designing a surge stopper with fault latchoff using LT4356. https://www.analog.com/media/en/technical-documentation/data-sheets/LT4356-3.pdf I decide to use this MOSFET, which ...
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The Project This part is pretty simple: I'm building a stunt lightsaber up from scratch. The led is held in a heatsink housing inside a 1 inch (internal diameter) aluminum tube. The heatsink is rated ...
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I'm looking for current sens resistors. As those are rather big (and beeing for now the limiting element for my PCB size), I would like to stop using over-rated one and take some with "just" ...
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The question applies to a buck converter design on my board: Here is a 3D view of this section: Layout of this section: L1: L2: Layer 3 is power and layer 4 is again a full ground plane. Here is ...
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In looking for a heatsink I came across a company giving the thermal resistance of extrusions in °C/W/3in. How do I use this? Say I use an extrusion with a specification of 1.5 °C/W/3in and get it ...
martin's's user avatar
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I am curious to know what thermal noise waveforms look like in the time domain. Most of the analysis is based on probability. What is the typical voltage amplitude of thermal noise in let's say a ...
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Reference Why would thermal properties of a material (FR4) depend on direction of heat flow?
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I am looking at the datasheet of a SiC MOSFET, which has a junction to case thermal resistance Rth(j-c) max of 1.41°C / W. The junction to ambient thermal resistance is not provided, as this type of ...
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Is there any way to figure out the thermal resistance of a heat sink without using a datasheet or using it in an actual circuit? I mean, simply by knowing its dimensions and material.
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Let's say I found a random heatsink with no name or model or anything else from which I can find a datasheet and get its thermal resistance. Therefore, simply by knowing its sizes, how can I calculate ...
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The 6 SMD MOSFETs in the center generate a total heat of about 80w. I was planning on using this heatsink (ATS-1106-C1-R0) with this fan (08025SS-24Q-AT-D0) mounted directly above it. Looking at the ...
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How much headroom is good design practice for a junction temperature calculation? If a junction can be max. 150°C for example, what is the closest temperature one can be under and still feel "...
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I am a junior electrical technician. This question is not on theory but on the practical procedure of how to take a thermal imaging on an electrical switchboard. I will appreciate if some veteran ...
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I am working on a solar setup that is powered by a Li-ion batteries. However, Li-Ion batteries can't be charged below 0 deg C, and thus if it dies in the winter, it will need to be warm before it can ...
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How does heat impact the signaling performance of unshielded ribbon/flexible flat cables? Background: I'm modding a camera to improve thermal performance by adding thermal pads between the heatsink ...
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What is the suggestion for thermal vias under the exposed pad of ICs ? I understand that copper plugging would be ideal. But if I only have the choice of tenting or not tenting, should I leave the ...
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Which practice is better for measuring the temperature if a MCU on a PCB with a thermocouple: Measuring on the case of the MCU with thermal epoxy attached to the thermal couple, or super glue? I feel ...
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My two PCB mount power supplies are getting quite hot (temp 60 to 70 degrees). Max temp of the power supply is 90 degrees. I cannot use external heatsinks due to space constraints. Input voltage is ...
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I'm trying to modify a standard cooler (about 1.5 cu ft) so it no longer requires ice. I want to get the interior to 35 - 40F assuming the ambient temperature is about 75-80F. However, I don't have ...
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So I have a circuit like this: And I am driving it with a desktop power supply at 5A (<1 Volts varies by coil). The issue that I am having is that my power supply is overheating. I am rapidly ...
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The voltage(rms) created by thermal noise is: What is the bandwidth(Δf) of the thermal voltage?
Cartoon Ryan's user avatar
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I am using high voltage MOSFET in TO-220 package with a heatsink like this one: Under normal conditions, the temperature of heatsink does not exceed 90 degrees. My MOSFET can run up to 120 degress ...
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I am looking to find an appropriate range of heatsink selections to maintain my resistor from damage due to heat. I am using a flat plate (SS) resistor from ARCOL (TFBR900). It is rated for a 900 ...
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I am contemplating whether or not I need chassis perforations for heat dissipation in a project. The box is roughly 440 mm wide, 280 mm deep and 85 mm high (2 rack height units aluminum enclosure.) ...
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I am using a 7106DG heatsink to dissipate the heat from an IC. It looks just like in its datasheet: It leaves a gap between the IC and the heatsink, and the datasheet even mentions it, but I guess no ...
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Hello there fellow engineers. I'm in the middle of design controller for floor heating. The idea is to have a triac based design with zero detection circuit, for each control point (each heating cable ...
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1 answer
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I'm trying to think of a way to decrease the temperature that my PCB is running at, but I don't want to add a heatsink if I don't have too since I want this board to have as low of a profile as ...
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Shouldn't the junction to case (top or bottom) thermal resistance depend only on package or IC internals? How do the PCB details play a role as mentioned in footnote 1?
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I see similar W and L for both Cu and FR4. Why is the Cu thermal resistance shown higher than FR4? Is it because of Ounz difference? 1 Oz Copper= 34.8um. FR4 seems to have more thickness-> How ...
Dynamic_equilibrium's user avatar
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I have a camera sensor (bare die) that must go on a very tiny PCB that also contains electronics for data serialization that dissipate enough power to make the PCB pretty hot (40-60 deg. C). I want to ...
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I have a picture of a device's handpiece and I want to know the applicatioan of its components but I'm confused about one of them. Can anyone help me to figure out what this is component? (Marked with ...
Alireza Tatality's user avatar
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How would one calculate the temperature change in a wire into which a microwave signal of a given frequency and power is applied?
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I am working on a custom PCB design. The SoC chipset which we use supports only commercial grade temperature (minimum operating junction temperature of SoC chip is 0ºC.) We want to operate the device ...
Raman's user avatar
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1 answer
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I am designing the thermal outline plane of this current amplifier ic in a 4 layer board using Eagle Pro. This board will be made using ENIG process. After spent so much time trying to understand in ...
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1 answer
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Here is the datasheet: I calculated the power dissipated through one of the 6 diodes according to this formula $$P_d = U_\text{D0}\cdot I_\text{average} + R_{d}\cdot I_\text{rms}^2$$ Then, I would ...
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I'm simulating a simple circuit with a resistance temperature detector. I want to know if it is possible to simulate the small change in the resistance as the current flowing through the resistor ...
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7 votes
5 answers
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From the datasheet: The datasheet notes that the case to heatsink thermal resistance is equal to 0.4 K/W. I do not know how they obtain this value as the thermal resitance depends at least on the ...
Jess's user avatar
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If I want to compute the junction temperature of a component, I can by using its thermal resistance (case to junction) and if I know the power dissipated by the component and the temperature of the ...
Jess's user avatar
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I’m hoping for some advice on wire gauges in practice with respect to heat/safety. I am planning an LED strip setup and have created the following diagram: The setup is designed to be modular, A ...
SeanA's user avatar
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Referring to the question I asked earlier, this is a perplexing thing which I noticed. Here is a picture: The first plot (blue) is the I-V Shockley curve for D3, whereas the second one (green) is ...
electrovolt's user avatar
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0 answers
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On my IMS PCB I mounted three types of LEDs: https://dammedia.osram.info/media/resource/hires/osram-dam-8405100/GD%20QSSPA1.14_EN.pdf https://dammedia.osram.info/media/resource/hires/osram-dam-...
Mark's user avatar
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I am planning use to resettable thermostat switch in my circuit. I will use it to turn off the optocoupler input. With 5 volt, current is 5-10 mA in optocoupler LED. But I'm worried that an electric ...
johny adv's user avatar
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6 votes
2 answers
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Whenever I rework a Zener diode which has been running too hot (i.e. failed), I like to replace it with a higher-power equivalent when possible, and (if through-hole) raise it slightly off the board ...
rdtsc's user avatar
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3 answers
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I'd like to measure the surface temperature of of a metal surface, to see how much that metal surface is heating up. I'm trying to recreate The EngineGuard. The EngineGuard uses a 10mm washer, that ...
Tyler DeWitt's user avatar
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DIY oven repair question. My oven has two thermal fuses, one is definately blown, I'm not sure about the other. Are these typically normally closed cicuit (open when hot) or could they be the other ...
Kev G's user avatar
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1 answer
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http://www.aosmd.com/res/data_sheets/AONP36336.pdf Why do MOSEFT manufacturers provide a void as shown below?
Dynamic_equilibrium's user avatar
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1 vote
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I need a heat sink with a thermal resistance of 0.7 °C/W/3" or less. C/W/3" represents how many degrees Celsius per watt a 3" long section of heat sink can dissipate without exceeding a ...
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