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Questions tagged [heatsink]

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

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23 views

Thermal resistance of Thermal Interface Material

Can anyone please give information how to calculate the thermal resistance of SIL PAD "TSP A2000" from make Berguist. from The data sheet its specified thinness is 0.254mm, Thermal conductivity (W/m-...
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59 views

LF33CV voltage regulator overheating

I'm trying to turn on a laser (3.3v - 4.5v, 100mw) using a 9v battery and LF33CV as voltage regulator(TO220 package, 3.3v output). After 20 seconds the voltage regulator is getting so much hot. I was ...
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49 views

DIY Power supply kit suggestion (Fan & pull-up resistor, cap)

I bought this 0-30v power supply DIY kit... There is three suggestion I need... 1. I want to use a 12V fan, so I'm changing the 7824 to 7812. So, I'm thinking to change the pull-up resistor (2.2K) to ...
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105 views

Heatsink on top of SMD plastic IC or bottom of PCB?

I often do designing power modules and always wonder if there is some kind of rule how to properly cool SMD devices. I always look at final products from other companies and some are placing heatsink ...
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169 views

Why does a Peltier cooler heat up when cooled by ice?

On this post, the question presents a problem of a Peltier cooler heating up after operating for a while. The explanation was that the Peltier cooler is only able to maintain a fixed temperature ...
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3answers
127 views

Can I increase the power rating of a film resistor if I increase the cooling?

I am trying to apply 1 kW of heat to an area of 10x10 mm and I am considering using a panel mounted film resistor. One that meets my power requirements doesn't exist so I am wondering if I can go ...
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4answers
391 views

How do thermal tapes transfer heat despite their low thermal conductivity?

I found myself needing to attach small heatsinks to Mosfets and CC power regulators. Also some high-power diodes. Today I have learnt that thermal compounds, even best in the market, are dozens of ...
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11 views

Infineon IPOSIM tool for IGBT thermal loss calculations

I used the infineon IPOSIM power tool for simulating a motor drive for my required conditions and got the results for a custom input drive cycle. The results were given as power dissipation per IGBT(...
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16 views

Unexpected battery float voltage in BQ2057WSN charging circuit

We have designed a changing module using BQ2057WSN IC to charge a 7.4V, 6600mAH Li-ion battery. My supply power is 12V,2A SMPS. I have set my charging current to 600mA. The battery is charging, but ...
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1answer
165 views

500V generation, MOSFET Heating Problem

Referring to my previous post. I have successfully generated 500V. The problem I am facing an issue. MOSFET I am using for switching is FQB34N20LTM. The MOSFET is burning badly. The snap of drain ...
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1answer
36 views

Application based Heat sink design for Power diode

Instead of having a heatsink directly connected to the diode, I want to have a 2 mm layer of cold rolled steel in between case and heat sink(aluminium){for waterproofing as needed in the application}. ...
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38 views

BQ2057WSN Circuit Heating issue

We are using BQ2057WSN charging IC to charge a 7.4V, 6600mAh Li-Ion Battery by providing 12VDC,2A power supply. According to my calculation the charging current is set at 625mA. But while charging, ...
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277 views

Heatsink on underside of PCB

I have prototyped some DC-DC converter modules, and they work well. However due to size, I don't have a huge amount of copper pour for them to dissipate their heat. I have used 2oz copper but the ...
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3answers
103 views

Heatsinking considerations for Common Cathode Rectifying Diode

I am using this as rectifying diode in full bridge configuration in one of my power supply designs. My questions are regarding heatsinking of the diodes. They are as follows: Do I need to use ...
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19 views

Heat transfer coefficient in a Module Baseplate

Today, for example in a power IGBT module cooled by a heatsink, it has been found that the heat transfer coefficient (htc) distribution may not be uniform across the bottom surface of the module ...
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2answers
89 views

Thermal Glue solvent

I have a PCB with many chips on it - it's a "hashboard" for an ASIC bitcoin miner. There are 63 chips on every hashboard, and each chip has a small heatsink on it. I tried heating the heatsinks with ...
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1answer
36 views

Is it possible to use Ultrasonic sensor HC-SR04 in continuous power-on mode

I will be using Ultrasonic sensor HC-SR04 in water level measurement. I will be triggering the US sensor and getting back the time-pulse from it at very slow rate maybe once every minute. I want to ...
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1answer
36 views

Representing Heatsinks on board layout

When using CAD software to draw board layouts, is there any convention on how to represent heatsinks attached to, say, some power transistors? I want to make sure they don't interfere with one another,...
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1answer
56 views

If I need to attach a heat sink to a planar MOSFET, to which terminal should I attach it to?

This is a newbie question on MOSFET structure. If I need a heat sink to be attached to MOSFET, it should be closer to the source of heat. Here channel is the source of heat. Hence heat sink should be ...
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1answer
69 views

LD1117V33 voltage regulator heatsink, thermal paste needed?

I want to screw a heatsink to my LD1117V33 voltage regulator. It's a normal 3mm screw and nothing inbetween. Do I need to use thermal paste or something like that? It will be regulating 12V down to 3....
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1answer
60 views

Water-Based Heat Sink

I am trying to incorporate a TEC in a portable system. The heat from the interior of the system needs to be transfered to the exterior where it can be dissipated freely into the environment. Now, I ...
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1answer
113 views

Heatsink pad connected to ground pins

Is it safe to use the exposed heatsink pad of a QFN to also connect the ground pins of the IC? (Like this question, but in my case the pad has many vias connecting it to ground plane.) Additionally, ...
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1answer
52 views

Electrical insulation resistance of TO-220 package with SIL pad and plastic shoulder washer?

What would a ballpark insulation voltage (HI-POT) rating be for a TO-220 package (with a "hot" tab) mounted to a grounded heat-sink with SIL pad and shoulder washer? I am not seeing much ...
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2answers
123 views

How do I determine the junction-to-ambient thermal resistance?

For a project I'm working on, I was considering using an AS7805 to supply low-noise 5V power to some sensors. (due to the uncertainty that resulted in asking this question, I've since changed to a ...
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8answers
7k views

Why are electrically insulating heatsinks so rare? Is it just cost?

Edit: It seems my initial question (Why are there no insulating heatsinks?) was based on a false premise, and there are in fact insulating heatsinks--I just wasn't able to find them with a cursory ...
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442 views

Tesla coil circuit troubleshooting

Ok so we are making a tesla coil. Here is the circuit diagram we are referring: Now it worked when we first made this. The light bulb lights bulb when we bring it near to secondary coil. Then we ...
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3answers
68 views

Mounting finned flat-base heat-sink with no tabs or screw-holes

The heat sink has a flat base with no tabs or holes. How is it supposed to be mounted on a PCB? Wire brackets soldered to the PCB come to mind but then how does one ensure there's enough pressure ...
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1answer
73 views

LED ULN2803 thermal / heatsink questions

I'm intending to use LEDs of 5mm, which have a max forward current rate at 30 mA, or a value of 100 mA, with 10% 1 kHz duty cycle, in a circuit like the one below except some changes: STM32F103C8T6 ...
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1answer
59 views

Transistor Inverter - when does excessive small wattage become a problem?

I'm trying to choose the best values of resistors given the stock I have so that I can deliver sufficient power and current to an HM-TRP radio module. In this circuit, I used the 100K resistor ...
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1answer
71 views

How can I install mini aluminium heatsink to wireless card?

I am thinking about increasing txpower of the my wireless card. But I am worrying about the heat can damage my wireless card. My solution is installing aliminium heatsinks on the wireless card. My ...
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2answers
121 views

install heatsink on BJT

I am facing the problem with the heat of transistor disturb sensor reading. Here the link refer problem I am using BC548 transistor. It is a bit hot when operating because it disipates power around ...
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4answers
208 views

MOSFET thermal resistance

I am trying to calculate the total thermal resistance of my FET to see what heat sinks are required, are the following calculations correct? $$ Power = \frac{T_{jmax} - T_a}{\theta_{JC} + \theta_{CA}}...
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252 views

I want to attach a heat sink to the inductors on my motherboard, which glue could I use? [closed]

If I wanted to attach a heat sink to the inductors on my motherboard, which glue could I use? I have a Gigabyte A320M-S2H, this motherboard has heating problem when used with the AMD ZRyzen 7 2700X ...
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3answers
387 views

Can i get away with a pcb heatsink for a triac?

so, i have a bunch of to-220 L4006L5TP triacs laying around and i have to design an AC phase control pcb, reading the datasheet i saw that the Rθ(J-A) is 50°C/W, the Rθ(J-C) is 3.3°C/W and the voltage ...
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2answers
127 views

Confusion with relating thermal resistance temperature, and electrical power and heat sinking

What is meant by the following?: In general, a device with a thermal resistance θ equal to 100°C/W will exhibit a temperature differential of 100°C for a power dissipation of 1 W, as measured ...
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1answer
65 views

Interpreting a datasheet of resistor for heat sink

I will have this 47k 50W wire wound resistor which will be across line and neutral which means 230 VAC rms. So the electrical power in theory will be V^2/R = 1.2 Watt. How should one interpret this ...
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4answers
227 views

1N5822 schottky diode heatsinking

Is the cathode for schottky diode hotter than the anode, as is common for most diodes, or is it reverse polarity? A schottky is a metal-semiconductor junction, with the metal at the anode. So it ...
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2answers
88 views

Intermittent power dissipation calculation on TO-220 package

For a certain application I will be using this resistor. I might also go for this other resistor if needed. The working conditions are: Ambient temperature (max): 70 ºC Power to be dissipated: 15 W "...
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2answers
156 views

MOSFET's getting too much heat up without any load

I am working on inverter, MOSFETs in h-bridge inverter goes heat up without any load attached. I also attached pull-up and pull-down resistor on it. here is my circuit duagram. EDIT Sources of PMOS ...
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3answers
663 views

How to calculate Junction to Ambient temperature of LED?

I'm trying to calculate the Junction to Ambient temperature for this Cree LED: https://www.mouser.ca/datasheet/2/90/ds--XHP502-1093532.pdf I know how to calculate this: Junction Temp = Junction to ...
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3answers
772 views

The best way to attach a heatsink to a SMD component?

There's a SoC I want to throw a heatsink on. What's the best way to do this for maximum heat transfer and longevity? I know of thermal pads, thermal adhesive, and thermal paste -- but when it comes ...
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2answers
174 views

Voltage regulator with heatsink gets overheated

First of, I'm sorry if I'm using the wrong terms or if I'm pointing out something that is obvious to most, this is not my profession, it's only a hobby. I have an input voltage of 12V 5A which is ...
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2answers
81 views

Synchronizing IC Temperatures

I have several separate identical PCBs with identical ICs on them. It's fairly critical for this application that all the IC's are synchronized in regards to temperature. E.g. if one increases by 1 ...
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3answers
521 views

Electrically Grounding a Large Heatsink to PCB Layer Ground

I have a 100x100mm board that is directly attached to a same sized heatsink on one side (touching heat producing IC packages). The board is 4 layer, with a large ground middle layer. Is there any ...
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2answers
405 views

Thermal pad thickness

We are going to use GAP PAD HC 5.0 thermal pad to transfer the heat from a FPGA (XCKU040) to a heatsink. My question is regarding the thickness I should choose to obtain best performance. On the one ...
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0answers
79 views

What fan could I use to extract hot air from an oven?

I am making an reflow oven. I've decided to use the picoReflow to do the job and monitor it. The oven is originally a lab oven, and it doesn't cool quickly at all. It has a vent at the top which I'd ...
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1answer
343 views

Galvanic Corrosion of Copper, Aluminum, and ENIG Plating

I need to attach a heat sink to a PCB. The PCB is a 560 mm x 9 mm strip of LEDs. The LEDs vary from mid-power to high power. I have a pure copper solution for the high power. I am investigating the ...
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1answer
2k views

Air cooled heatsinks - horizontal or vertical fins?

If we have a heat sink with fins, for example like this how does the efficiency vary between horizontal and with the fins vertical in non forced air?
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1answer
64 views

Selecting power resistor

I want to build a thermostat and I'm not sure what power resistor to choose. The thermostat will be build inside a broken microwave oven. The resistors will be connected to 230V AC and they will be ...
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0answers
33 views

Techniques for probing circuits that would normaly be covered by a heatsink

I have a circuit board I have to probe and measure to first debug and then later on verify performance. The circuit board contains a power amplifier that requires a heatsink in order to keep the ...