Questions tagged [heatsink]

A heatsink dissipates heat into the surrounding air and thus provides cooling.

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52 views

Heatsink calculation for a MOSFET in active mode

Actually I am working on a project to create an electronic load for power supplies, batteries... testing. The circuit is already designed but I am working now in the heat disipation of the mosfet in ...
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1answer
25 views

is connecting high end high power leds in series feasible and are there light quality or other issues

i'm building high power high CRI cine lighting mostly to illuminate softboxes and have chosen Cree XLamp CMT2850 LED 1400mA 36V (Fidelity 95plus CRI). I plan to build about 12 units for the studio. I ...
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3answers
59 views

What is this thermal adhesive? (heat transfer compound)

Well generally I I encounter this thermal adhesive. for example in inverter (brand: allen bradley). But it is different from I've seen before. It is very solid and generally using at very strange ...
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95 views

LM317 / linear regulator, estimate of heat capacity

Quick question - what do you think the heat capacity of a LM317 might be? The use case is that I want to ignite e-matches, which requires are short duration high current and would prefer to just use ...
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29 views

110VAC 1-HP 10A motor VS 50-60A SSR

I'd like to build a circuit to control a 1-HP 10A motor. To switch it on and off I was thinking of using a SSR since I could pair it with a microcontroller. I've never used one before but thought I'...
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34 views

What type of thermal paste for cooling a stepper motor?

My little Nema 11 stepper becomes hot when I use it to hold a position. This is quite normal since it use 1.3 A of current. My plan is to use the big aluminium supporting bracket as an heat-sink too. ...
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66 views

Are vias underneath a SMD component without a thermal pad useful for cooling?

I want to cool this bridge rectifier from Diotec in my circuit to minimize radiated heat by placing a small copper area directly underneath it and connect it to a larger copper area on the opposite ...
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47 views

choice of heat sink (thermal resistance)

I want to calculate the thermal resistance resistance for my board: I found on the amplifier datasheet how I should calculate. I found a value of -0.389 °C/W which seems wrong to me. I don't know if ...
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33 views

If I use multiple heatsinks in the same enclosure, does the thermal resistance at airflow of each heatsink change?

I am designing an enclosure with 2 identical heatsinks. The thermal resistance is rated at 1.50°C/W @500LFM. If I use 1 fan in the enclosure that produces an airflow of 500 LFM, will each heatsink (...
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18 views

How to calculate thermal resistance when I have two metal sections as shown below?

I have to calculate the Thermal Resistance of the heat-sink which as below. The ICs top is first first connected to a solid piece of Aluminum and then that solid Aluminum is connected to top plate of ...
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63 views

LM2596 Heat Sink

I’ve designed a DC-DC step down circuit based on the LM2596 regulator to replace a battery in a project. The circuit steps down a 12V supply to 3.9V and is used to power a module which draws 500mA, ...
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36 views

Heatsink Question

Ok so I have designed a circuit and drawn up its PCB and I have a slight question about the heatsink I'm going to use. Now you'll see in the images below the place where I generally want to place my ...
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91 views

TO-263S heat dissipation

I'm designing a mosfet PWM device with a rather high current. According to my LTspice simulation the mosfet has an average power dissipation of 20W. The mosfet had a TO-263S package ( https://fscdn....
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67 views

LM338 is getting hot and stop working when we try to flow current more then 1A

I try to make a 30 V, 5 A power supply using LM338 (without heatsink) voltage regulator IC. In my case the value of R1 is 100 Ω and R2 is 2.2 kΩ. then it gives 29.6 V as output. when we connect a 10 ...
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29 views

Performance of series fans on a heatsink

I have a large heatsink with fans that push air through the heatsink parallel to the fins, very similar to Fischer Elektronik LA 9 150 230 V but not identical. I know that a heatsink increases the ...
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65 views

Can I choose a heatsink based on its thermal design power (TDP) for cooling LED chips?

I am confused about TDP ratings and what they refer to actually. The reason I am confused is because most modern CPUs and GPUs, although not ideal, are able to sustain very high temperatures (80 C or ...
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93 views

I'm making a small refrigerator with a Peltier module but I can't find a heatsink. Will it work if I only use thermal paste and don't use a heatsink?

I'm making a small refrigerator with a Peltier module but I can't find a heatsink. Will it work if I only use thermal paste and don't use a heatsink? Can I use a 9 volt battery for a 12 volt module?
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213 views

What is this black tape on my laptop's keyboard?

I am trying to replace the keyboard on my 2019 Samsung Notebook 9 Pro. I had to pull off a layer of black tape on the old one to get it out. The tape was glued to the bottom of the keyboard, right ...
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51 views

Insulated TOP3 triac soldered to Aluminum plate — will it last?

So I ordered a cheap SSR from Aliexpress and it finally arrived. I immediately disassembled it to look what's inside. It wasn't so bad -- BTA40-800, MOC3063.. assuming the components are not ...
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56 views

Regulator/heatsink heating up even though load is only 50% of regulator Imax

aI have made a small +/- 24VDC liner supply for the use of powering an audio preamp PCBA. LM317 for plus/ LM337 for the neg (both TO-220), 10uf output capacitance added. Even though this circuit doesn'...
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2answers
78 views

Two separate heatsinks leads to less volume than one?

I am currently designing a heatsink to handle the heat from a diode and a MOSFET. I can pick either two or one heatsink, and my goal is to minimize the volume of the heatsink. Intuitively I would ...
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54 views

Trouble with understanding heatsink datasheet

I am trying to understand the heatsink datasheet provided in the following link: https://www.fischerelektronik.de/web_fischer/en_GB/PR/SK434_/datasheet.xhtml?branch=heatsinks My problem is that the ...
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49 views

Which insulating tape and when?

There are quite a few tapes out there, from the plain black electrical tape to different color variations to Scotch 33+, 77, 88 to Kaptons (polyamide), I have also seen some velcro type wraps which ...
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50 views

Multiple devices on a heat sink

I am mounting multiple devices (TO-247) on a large rectangular heat sink. What difference does it make to mount them on the edge of the heat sink vs. the middle?
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31 views

LM2576 Heat sink Calculation

I am designing a PCB which incorporates a LM2576 LM2576 datasheet in the T0-263 package which is a SMD with a power disputation of proximity 2W(calulated from datasheet). I am after some help in ...
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71 views

Fixing hot plate and the heat sink, which thermoelectric module would produce more power?

Thermoelectric coolers (TECs) are typically used to generate temperature difference. Thermoelectric generators (TEGs), however, are used for power generation. While TECs are much cheaper than TEGs, ...
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1answer
88 views

Modify PCB Mains Voltage input to 12VDC

One of my amplifiers has died so I need to find out if I can hookup a spare I have lying around as per "Section B" of the below block diagram. I have done the same modification before on ...
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2answers
142 views

Innovation in heat-sink design? [closed]

20 years ago, if you opened up a consumer-level desktop computer its heatsink would be a "metal grill" type device place on top of the CPU. 20 years later, if you open up a consumer-level ...
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71 views

Choosing a non specific heatsink

I am designing a PCB board, and it has lots of components on it. It has like 8 MOSFETs, diodes, fuses, current sensors, a STM32 and other components, and with an exception to a few (like mosfets and ...
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809 views

How should I design a heat sink for an SMD power mosfet?

I really like the specs for the Infineon OptiMOSPower-Transistor IPT007N06N, but how would I keep this beast cool? Usually I use regular aluminium heat sinks (with water cooling or a fan) for MOSFETs ...
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864 views

Effect of length on a thermocouple's accuracy

I'm a mechanical engineer working on acquiring some temperature data using thermocouples. Q. I wanted to know the effect of wire length on a thermocouple's accuracy. I don't have much of electrical ...
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116 views

Does anybody know a better way to cool a heatsink that is not a fan? [closed]

I am designing a portable distiller powered by the sun. I will be heating the water with a heating coil and then when the water evaporates I will be collecting the stem in a metal tube(not sure what ...
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93 views

heat sink solution for light source around 1000°C

I'm going to use a infrared light source IR12k which can reach 975°C for my design. However, I'm not sure whether I can solder this light source with cable whose other end is soldered with power board....
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72 views

Heatsink to dissipate 170W

I am planning to build a light from 12 LEDs (CREE XML RGBW). These are 4 diodes on one star - a red, a blue, a green, and a white - with a total forward voltage of 13.9V at 350mA. Is there any kind ...
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43 views

Is it okay to leave regulators heating at higher end of range of operating range?

IC operating range -20 to 80 degrees Celsius Regulator IC application spec 12V in, 5V 1.5A output Is it okay to keep IC running at 70-75 degree Celsius (with heat sink) all the time, circuit will be ...
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3answers
71 views

Calculating PCB temperature increase

so I have created a PCB with a lot of components on it, its a rather large PCB, roughly 18cm x 19 cm. A lot of the components' datasheets (things like Resistors, Switches, capacitors, relays, CAN ...
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33 views

Heat sink for the L298 stepper driver IC

I am coming today to seek help from you for sizing a heat sink for the L298N IC. This Ic will be used to drive a 2A/phase stepper driver, supplied with a 12Vdc signal, and 5Vdc for the logical part. ...
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1answer
52 views

how to use TO-254 Power MOSFET and DIODE's full current capacity?

I want to know how I can utilise full current capacity of a TO-254 power MOSFET or diode while using it on a PCB. Presently I'm not able to utilise it completely, due to the limitation of the number ...
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1answer
42 views

Heatsink selection and datasheet specifications for Thermoelectric Generator

I have bought this TEG. I am planning to use it as a generator, for energy harvesting applications. I am having trouble though understanding both the diagrams and the meaning of the TEG's ...
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3answers
705 views

Does cooling the NAND chips on an SSD negatively affect its reliability?

The problem of heat dissipation in high-performance, small form-factor SSDs is well-known, for example, the paper Transient Thermal Analysis for M.2 SSD Thermal Throttling published in 2018 17th IEEE ...
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97 views

How do I distribute heat from a heating pad to my electronics?

I'm building an outdoor sensor system (a bunch of sensors and a Raspberry Pi inside a plastic enclosure). A few weeks ago, one of my prototypes got too cold (ambient temperature went below 0deg ...
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28 views

Practical Issues with Surface Mount Heatsinks?

I'm considering using surface mount heat sinks for D2PAK devices on a PCB. These heat sinks are bent sheet metal frames with tin/lead plating in tape/reel packaging which are suitable for soldering ...
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1answer
81 views

Heatsink land pattern interpretation (DPAK heatsink)

I'm looking at using a D Series heatsink from Ohmite. The land patterns on the last page of the product PDF are very lightly labeled and I'm not entirely sure how to interpret them https://www.ohmite....
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98 views

Thermal Resistance, PCB Operating Temperature and PCB Self Heating

I want to understand a few terms. My Questions : What does Maximum PCB operating Temperature for a PCB in general depend upon? Maximum PCB Operating temperature depends on Tg (Glass Transition ...
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86 views

How fast will a resistor heat up under high power?

I am building a circuit for some induction coils on a coilgun, and it will draw about 1.75A from a 12V power source (I know it probably won't be very powerful, but it is difficult to find resistors ...
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36 views

Heatsink Crossing Primary and Secondary Sides in Switched-Mode Power Supply

I've taken apart a non-oem laptop power supply. There is clearance on the board between primary and secondary. However, they've placed a single heatsink across the board for the primary and secondary ...
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57 views

How close can I put my LEDs together in a given Heatsink?

I'm making a led panel and I'm facing the following issue: I want to know how close I can put the LEDs together in a given Active Heatsink. So, I've the LEDs, the Heatsink and the thermal paste ...
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64 views

Does LED thermal need to be isolated from GND in this case?

I'm designing a small LED device which is powered by a battery. The case of the device is acting as the GND line between the battery and the LED driver, but it is also acting as the heatsink for the ...
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2answers
371 views

How to mount TO-92 package on a heatsink?

I want to measure heatsink temperature using LM35 TO-92 package. heatsink is a flat surface of aluminum. What is the proper way of mounting a TO-92 temperature sensor on a heatsink so that can ...
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55 views

Thermal Resistance of PSU's heat sinks

I have a non functional PC power supply unit, and I would like to keep its heat sinks, but they have no model or part number in them. Is there a way to estimate, calculate or measure their thermal ...

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