Hello,
Anyone have experience with these thermal pads? I need buy a 32 pcs.
https://www.tme.com/us/en-us/details/cd-02-05-264/heatsinks-equipment/wakefield-thermal/
Anyone have experience with these thermal pads? I need buy a 32 pcs.
https://www.tme.com/us/en-us/details/cd-02-05-264/heatsinks-equipment/wakefield-thermal/
Always buy thermal pads from trusted suppliers that furnish you with the manufacturers specification sheet. Purchasing from the USA may cost more after import duties etc.
Take a look here; https://uk.rs-online.com/web/c/?searchTerm=to264+thermal+pad
Take a look here; https://uk.rs-online.com/web/c/?searchTerm=to264+thermal+pad
I haven't used any of those phase-change thermal interfaces, but they are interesting. That line from Wakefield-Vette (https://www.farnell.com/datasheets/2620381.pdf) has a thermal impedance of 0.107 C-in2 / Watt.
The usual suspect here in the forum for thermal interfaces is Keratherm 86/82. (https://www.kerafol.com/_wpframe_cu...tenblaetter_86_82_06-22___094426-20062022.pdf)
It has a thermal impedance of 35 C-mm2 / Watt, or 0.054 C-in2 / Watt (if my math holds up).
Roughly half the thermal impedance? Does that mean the Keratherm is twice as effective?
Another consideration is that the Wakefield-Vette phase change occurs at 60C, so in theory one would have to initially heat up the device and heatsink together to 60c to get it to seal for best performance.
Others more familiar with these can chime in, but I usually think of Keratherm as the benchmark from which to compare other interfaces that don't include goop.
In the US, the easiest source of pre-cut Keratherm pads is the diyAudio store. From where do our EU friends get their Keratherm?
The usual suspect here in the forum for thermal interfaces is Keratherm 86/82. (https://www.kerafol.com/_wpframe_cu...tenblaetter_86_82_06-22___094426-20062022.pdf)
It has a thermal impedance of 35 C-mm2 / Watt, or 0.054 C-in2 / Watt (if my math holds up).
Roughly half the thermal impedance? Does that mean the Keratherm is twice as effective?
Another consideration is that the Wakefield-Vette phase change occurs at 60C, so in theory one would have to initially heat up the device and heatsink together to 60c to get it to seal for best performance.
Others more familiar with these can chime in, but I usually think of Keratherm as the benchmark from which to compare other interfaces that don't include goop.
In the US, the easiest source of pre-cut Keratherm pads is the diyAudio store. From where do our EU friends get their Keratherm?
A very good source for Keratherm is here, last time I bought 30 pcs: https://www.conrad.com/en/p/kerafol...-suitable-for-to-247-70-50-to-247-180346.html
Those are the right shape, but lower performance. 70/50 series (1.5 W/mK) vs. 86/82 (6.5 W/mK).
You could cut your own 86/82 from Conrad.
Are you just focusing on the Wakefield-Vette product? Looks like I had a similar conversation two years ago.
@Ben Mah seems to be happy with the ulTIMiFlux and big dissipation numbers.
You could cut your own 86/82 from Conrad.
Are you just focusing on the Wakefield-Vette product? Looks like I had a similar conversation two years ago.
@Ben Mah seems to be happy with the ulTIMiFlux and big dissipation numbers.
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The Wakefield pads are very thin at 3 thou (75µm) - you may need to check if your devices are flat enough to take advantage, or whether they will need grinding flat. You also have to worry about burrs cutting through the pad with thin pads, another reason to grind flat. All depends on the quality of the TO264 packages and how well they've been handled. Silpads are usually at least twice the thickness, note.