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Questions tagged [heatsink]

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

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Heatsink can cause a shortcircuit what kind of problem occurs?

I'm not sure what will happen in this kind of scenario I'll share the photo of two diodes and basic connections below. These two diodes tab points are actually connecting same node because of tab is ...
MSB's user avatar
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How large would my heatsink need to be for the IRLB4132 at 12.6 V and 60 A

I'm building a power distribution board (PDB) for my drone, which is powering 4 ESCs and an Arduino 33 BLE Sense Rev2. I’m using a 3s LiPo battery which provides 12.6V at max charge. My ESCs are rated ...
YANNTASTIC5915's user avatar
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Troubles in understanding the TGA2214-CP microwave power amplifier datasheet

The datasheet of the Qorvo microwave amplifier is here. I have troubles with the following points: In p. 9, they give a schematic of the way to mount the amplifier (I believe). But at the end of the ...
MikeTeX's user avatar
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Generic thermal resistance values for a heatsink

I am building a linear power supply, and I would like to know roughly how big my heatsinks need to be. Is there a rule of thumb for the thermal resistance of a heatsink given its dimensions and ...
Klumpy7's user avatar
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How to remove an old epoxy-like thermoconductive compound?

I'm not sure if this is the place to ask or it would be better suited for retrocomputing. I'm salvaging some old components from old boards and I came across a very hard blue thermal compound that a ...
daneos's user avatar
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1 answer
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What's the purpose of a large thermal pad without a heatsink?

I found this thermal pad on a controller board for SATA to USB enclosure. It's stuck on the SATA to USB bridge ICs. You can see 2 ICs to the left of it. There was an identical thermal pad adhered ...
Nicolay Doytchev's user avatar
1 vote
2 answers
106 views

how to make heat sink under heat pads in kicad 7

Retired user here that have not designed a circuit in the last 3 years. So I got myself KiCad 7 and boy oh boy things have changed! Mostly for the better, but some things I used to do are now a real ...
Luc Belanger's user avatar
1 vote
3 answers
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IC thermal pad: Place heat sink directly over bottom-side thermal pad and thermal vias

If a VQFN package (below) has a thermal pad and thermal vias beneath it, the bottom layer should have an identical pad to act as a heat sink. Is it typical to surface mount a heatsink on the bottom-...
kando's user avatar
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1 answer
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IC thermal pad: Duplicate zone in inner layers also?

Question For a passively-cooled portable device (fanless, ambient cooling), what are typical methods to supplement the thermal pad of an IC to mitigate device temperature rise, (beyond efficient ...
kando's user avatar
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Understanding semiconductor thermal resistance

Most datasheets I read through have a thermal resistance rating attached to the particular package the semiconductor comes in (i.e. TO-220, D2PAK, TO-3P, etc), usually in the form of θJA (junction-to-...
lemon's user avatar
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4 answers
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Thermal conductivity of 1600W/m·K?

I am comparing different thermal conductivities in the market and found that the thermal conductivity goes up to 1600W/m·K for a thermal sheet, but a thermal paste is still 0.65 W/m·K. Does it make a ...
Mhairi's user avatar
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2 answers
659 views

Cooling IAUC90N10S5N062 MOSFET from the top

I design a sync - buck converter, and I need to cool down my top side and bottom side MOSFETs. For mechanical reasons, it is easier for me to place a heat sink on top of plastic housing of MOSFETs (...
Petar Kotnik's user avatar
5 votes
2 answers
405 views

Mounting an 11W SCR with a Flat Profile

I have two SCRs in my design that will be switching up to 15A at 120-240VAC. The two devices will split the power, with each one conducting a half cycle. I'm considering using the S6025 by Littelfuse. ...
user120632's user avatar
1 vote
1 answer
65 views

Spice model for a heatsink/mounting hole/test-point/connector pin - devices with one or no connection points - using Altium simulator

I am setting up a simulation model in Altium with SPICE models and have no idea how to provide a model for a single connection device (connector pin, test-point) or a no-connection device like a ...
REPuzzle's user avatar
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103 views

Heat sink calculation for multiple heat sources connected to a single copper plate

I have 2 switches, both are thermally connected to one copper plate. One switch has heat resistance - junction to copper plate = 1.09 C/W and dissipates 6 W of heat. The other has heat resistance - ...
Abhishek 's user avatar
2 votes
1 answer
157 views

Advice about power MOSFET layout and heat management

This question is a continuity to my previous one: Weird DC motor behaviour at low PWM duty cycle Here is my circuit schematic: The motor is a LEM130 from Lynch Motors (about 2 kW and 50 A rated power/...
Solmyr999's user avatar
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3 answers
102 views

Reducing linear regulator heat via series resistor

I'm working on a project that uses four L293D motor drivers to control three stepper motors and one DC motor. Separately, there is also a small servo motor. The L293Ds receive a 6V motor supply ...
E.HP.S's user avatar
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0 answers
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THT power transistor clamp mounting

I have a question regarding mounting THT power transistors (TO220, TO247...). I am building a output full bridge for a welder and I thought about not using PCB at all for the power terminals (D,S). It'...
tomstr21's user avatar
2 votes
0 answers
85 views

Design of heatsink - increase in ambient temperature during heat transfer

I have gone through few resources available online on how heat flow from die to ambient and how its is modelled as current source, thermal resistance and ambient temperature as voltage source. I have ...
KIRAN S's user avatar
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Thermal analysis of a step down regulator

LTM8053 datasheet I tried to plot the thermal graphic (watt-celcius) for this buck converter in MATLAB. The main goal is to find losses which turn into heat. Reasons for heat most of time switching ...
BlueWolf's user avatar
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77 views

Best way to heatsink many exposed copper polygons, avoiding electrical shorts

I'm working on a special type of lamp that uses 10 high-power SMD LEDs and 10 low-power TH LEDs. The heat dissipation will be an issue, so almost the entirety of the PCB is copper pours for the SMD ...
anrieff's user avatar
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1 vote
3 answers
325 views

How to apply thermal paste on a large surface (between IMS PCB and heatsink)?

I've got a project that features an array of ultraviolet LEDs on an aluminium board. This board shall be screwed to a heatsink. My problem is that I'd like to apply thermal paste to improve the ...
Korbinian's user avatar
2 votes
0 answers
62 views

Estimating junction temperature

I made a measurement using thermocouple to measure the case temperature of my TO-220 linear regulator (L7809). I'll be using degrees celsius for all temperature units and degree Celsius/Watt for all ...
user139731's user avatar
1 vote
1 answer
50 views

Heatsink and its thermal resistance parameter

Regarding this heatsink with this datasheet, its thermal resistance is given as .06K/W. It is also written "designed for use with multiple thermoelectric (Peltier effect) coolers". My ...
user1245's user avatar
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2 answers
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Thermal issues: surface mounted on 1" x 1" FR4 board

A number of parts are rated at certain thermal impedance with a note, something along the lines of surface mounted on 1" x 1" FR4 board like in this datasheet for instance - MOSFET Vishay ...
kellogs's user avatar
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1 vote
2 answers
180 views

Is there a rough rule for heatsink size?

Is there a simple rule that could be used to size a heatsink without fan using just the wattage and/or how hot a component would go? I understand heatsinks are in their own universe as there are many ...
Aram Alvarez's user avatar
3 votes
1 answer
610 views

MOSFET TO-220 heat sink pad is electrically connected to drain. Can I solder wire or trace directly onto heat pad, instead of drain pin?

I have a board-layout where a lot of things would be easier if I could solder to the metal-pad of the TO-220 N-channel MOSFET, instead of the drain pin. Apart from: "Metal pad was intended for ...
Jens Overby's user avatar
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2 answers
153 views

Is my heat sink properly sized for my LED strip?

I am looking for some help in sizing a heat sink for an LED horticulture light I am building. I will be attaching two Bridgelux BXEB-L1190U-30G3000-C-C3 LED strips side by side, link below to specs, ...
Chuck's user avatar
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1 vote
1 answer
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Are TO-220 and TO-247 MOSFET heatsinks compatible?

Are TO-220 and TO-247 MOSFET heatsinks compatible?
KMN's user avatar
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1 vote
1 answer
137 views

How to choose a Peltier module and heat sink to cool a MOSFET down to -40°C? [closed]

I need to cool a MOSFET down to -40°C, but I really know nothing about thermal devices. Could anyone teach me how to calculate the specific parameters that can help me choose the right Peltier module ...
zpyzpy's user avatar
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1 answer
29 views

Can HSG + TIM + HSG sandwich ever be better than one layer of HSG?

Here is a photo of a big diode and it's TIM (thermal interface material.) The foil appears to be aluminum, very thin and reflective, with white, crusty HSG (heatsink grease / paste / compound) on ...
rdtsc's user avatar
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5 votes
3 answers
2k views

My IRL540N is smoking

I am using an IRL540N MOSFET to drive a 12 V pump (about 6 A) and a 12 V solenoid valve (about 1 A max). It's smoking after just two uses. I need to know two things. Is it still alright? It's still ...
DribbleNibble's user avatar
0 votes
1 answer
151 views

Use Max Current or Inrush Current for MOSFET heat calculations?

I have two different MOSFETs controlling an actuator that is specified to have a current draw of 13A. There is also a note on the actuator datasheet about inrush current stating: Typically, the ...
jlaufer's user avatar
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0 votes
1 answer
96 views

Heatsink for i4-PAC

I'm using a CPC1998J "i4-PAC" solid state relay in a project that needs to fit in a very slim enclosure (e.g. hopefully around 15mm thickness), and I'm having trouble identifying suitable ...
rkagerer's user avatar
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5 votes
2 answers
259 views

If I attach the heat sink on the transistor, will switching power loss be lower?

If I attach the heat sink on the transistor, will PWM switching power loss of transistor be lower?
Ahn JIn Ho's user avatar
3 votes
0 answers
152 views

How to do heat sink calculation, when junction to case thermal resistance is not provided

I am not very knowledgeable, so please bear with me. For heat sink calculation, you need the junction-to-case thermal resistance of the chip, then the case-to-ambient thermal resistance of the heat ...
Schach21's user avatar
  • 263
0 votes
1 answer
37 views

Chart/ table to visualize how hot a device is actually getting

Maybe my question will be a little funny. But it will be very helpful if you can give a little information about one thing. In electronics, we calculate power at various points/calculations to predict/...
khatus's user avatar
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0 answers
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Should I place a Al plate above or below power supply to heatsink to distribute heat better?

I have a power supply mounted on an Al sheet (3mm thick) which is on top of a closet. Considering only heat dissipation, should I place the fanless power supply above or below the Al sheet?
yzu microPL's user avatar
0 votes
1 answer
94 views

Practical question: Temperature sensitive device, insulating or add more thermal mass?

If I have a very sensitive photodiode/sensor/analog front end part of a circuit that can be sensitive to temperature and the device does not draw much power (for example, a small photodiode,) what is ...
Josh Girgis's user avatar
3 votes
1 answer
826 views

How to calculate thermal heat from a switching voltage regulator?

I found this answer here which explains how to calculate the watts that are dissipated in a switching voltage regulator, but once you calculate the watts dissipated how do you know how much ...
Trev347's user avatar
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0 votes
0 answers
125 views

Heat sink designing for an automotive grade motor controller

I am working on an electric vehicle development project. I am using a motor controller to drive a 3 phase induction motor. The motor controllers' input supply is 48 volts, and they sink a maximum of ...
HANS Dpmco's user avatar
2 votes
2 answers
261 views

Gap between heatsink and external plate – help filling this void

I have an electric motorcycle (built two now) that I'm having an overheating issue with. This is a fully from-scratch build (minus the motor, controller and accessories), and I am learning a lot along ...
Dylan Brown's user avatar
3 votes
2 answers
550 views

How can I calculate how long it will take equipment in an enclosure to overheat?

This is kind of a follow-up question about determining the heat dissipated from equipment based on power consumption. I have a situation where I have to install a router and UPS system in an enclosed ...
Frank's user avatar
  • 293
0 votes
1 answer
100 views

3 W Power LED without heatsink (350 mA)

Can I use this Prolight Opto PK2N LED at 350 mA without a heatsink?
DJDB999's user avatar
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5 votes
1 answer
433 views

Cooling SMDs from the bottom

I remember a clever way to cool a SMD with a thermal pad from the bottom. It's like a copper pin or a rivet that goes through the board, in a hole right under the SMD thermal pad. Then it has a flat ...
bobflux's user avatar
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7 votes
3 answers
518 views

SMT heatsink makes a hole in the groundplane

I am putting an Infineon TLE8386 boost controller on a board. It uses an external FET, I have selected one in a TO263 (D2PAK) and I am trying to work out the compromise between heat-sinking and ground ...
Rodney's user avatar
  • 342
0 votes
2 answers
163 views

Does the direction of the screw for heatsink mounting matter?

I am currently design a high power system transistors in TO220 package. I am planning to mount those transistors on a metal box that will act as a dissipator/heatsink for the transistors. The walls of ...
Johan B's user avatar
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1 vote
0 answers
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Is it bad practice to connect a heatsink to my PCB's ground plane?

So, basically, I have this LED project which is going to dissipate lots of heat (I am assuming close to 50W) inside a case. The LEDs themselves are on a separate aluminum board which will be attached ...
alexoiunt1's user avatar
1 vote
1 answer
460 views

Optimizing Peltier water cooler set up

Application 20 gallon aquarium cooler Ambient temp: ~22C Tank target temp: ~17C Tank houses an axolotl and needs to be kept at cooler temperatures then currently in the basement. Current Peltier Set ...
Alfiero's user avatar
  • 13
-3 votes
1 answer
111 views

What is the purpose of these strange patterns in i/o port panel of GPU card? [closed]

Ref: https://www.techspot.com/article/1988-anatomy-graphics-card/ The left side pattern seems to get it attached to Graphics card slot- but not sure why those flanges are required. Absolutely no ...
Dynamic_equilibrium's user avatar

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