Talk:TO-220

message: TO refers to: Transistor Outline?
As in SOT - Small Outline Transistor. Just wondering
:Indeed it is. JEDEC standardised them, the earliest ones in the fifties. TO-3 for example is from the dawn of transistors.<BR>
JEDEC transistor outlines
Snakeburger (talk) 10:11, 2 May 2012 (UTC)
thread_title: Untitled

message: The author does not make clear exactly what is required in terms of electrical isolation for the heatsink: IF the IC is directly mounted without the use of insulating bushes.
The direct mount has the advantage of being easier & resulting in improved heat flow.
What is not clear is how the heatsink can be anything other than at ground potential given that direct mount is being undertaken.
I have yet to see a commercially built circuit where the direct mount is employed so it's not unreasonable to assume there are good reasons to avoid this method.
Perhaps a commercially experienced designer could comment more generally about the mount options & the pros & cons etc. --Peterlonz (talk) 07:39, 20 March 2011 (UTC)
replies: text: The author?  The author's name is "Legion". Every project article I ever read in the '70s in "Popular Electronics" or "Radio Electronics" discussed in painful detail the mica washers, heat sink grease, and nylon bushings required to mount power transistors to heat sinks. --Wtshymanski (talk) 16:15, 20 March 2011 (UTC)
thread_title:  Heatsink electrical isolation 

message: Vishay Semiconductor have released 20W resistors in TO-220 form. so this indicates the expected heat dissipation of the package with a heatsink.  source: "TPR Thick Film Technology 20 Watt Power Resistors TO-220 Package". there are 50W zeners in TO-3, and 10W in DO-4, 100W in DO-5 (for comparison). Charlieb000 (talk) 21:22, 3 August 2012 (UTC)
thread_title:  heatsinked dissipation 

message: Given a max junction temp of 100degC and an ambient of 30degC, an IRF510 can indeed dissipate around 1Watt of heat. Using formula from thermal resistance, Q = {{100-30} \over {3.5+0.5+62}} = 1.06 \ \mathrm{W} . Editor please either add citation for this or remove this section altogether, as there is NO CLEAR VERIFIABLE evidence.http://www.irf.com/product-info/datasheets/data/irf510.pdf
-Yusiang1998 (talk) 05:52, 5 December 2012 (UTC)
thread_title:  1W Dissipation citation error 

message: Please would someone knowledgeable add the dimensions to these transistor package articles ?
It has been said before, but its about time all these TO pages were combined into one. Darkman101 (talk) 08:04, 27 December 2012 (UTC)
thread_title:  Dimensions ? 

message: I have added a reference to a sentence, so I added it back to the main article after Alistair1978 rightly removed it because it was unreferenced. The sentence currently reads "A TO-220 package that is not heatsinked, dissipating 1W of heat, will be at a temperature approximately 65°C higher than the ambient temperature." How could this be reworded to make it less awkward and easier to understand? Piguy101 (talk) 18:12, 24 May 2014 (UTC)
thread_title:  Reword Sentence 

message: Mainly, this sentence: "The TO-220 case is found on semiconductor devices handling less than 20 amperes and operating at less than a few hundred volts. These devices operate at DC or relatively low (audio) frequencies, since the TO-220 package is not intended for devices operating at radio frequencies."
Here's a counterexample to each point: 
https://www.infineon.com/dgdl/irf1324pbf.pdf?fileId=5546d462533600a4015355dac93318a7
https://www.onsemi.com/pdf/datasheet/hgtp10n120bn-d.pdf
https://www.nxp.com/docs/en/data-sheet/MRF101AN.pdf
I am not sure what "(heatsink)" is trying to say in "TO-3P has a typical junction-to-ambient (heatsink)," but if it's not wrong then I'd suggest it's at least confusing.
"allowing the component to dissipate more heat than one constructed in a TO-92 case." doesn't sit well with me since it seems to imply that the choice is TO-92 or TO-220, whereas there are other packages like the TO-126 and TO-251 in between. But this is relatively trivial.
While I get that it's just to give an idea of the numbers, "A heatsinked TO-220 package dissipating 1 W of heat will have an internal (junction) temperature typically 2 to 5 °C higher than the package's temperature (due to the thermal resistance between the junction and the metal tab), and the metal tab of the TO-220 package will typically have a temperature 1 to 60 °C higher than the ambient temperature, depending on the type of heatsink (if any) used." doesn't agree with the Rth(jc) and Rth(ja) numbers listed elsewhere in the article. 
"devices in the also widely used TO-247 (or TO-3P) package can be selected" the parenthesis seems to suggest that they're the same thing, which they're not.  — Preceding unsigned comment added by 1N914 (talk • contribs) 04:52, 7 March 2021 (UTC)
thread_title:  Errors 

message: This article is full of errors. See section above. 2003:DC:7F23:9C3B:59C1:78D0:A3B:C56D (talk) 22:37, 4 April 2023 (UTC)
thread_title:  This article is full of errors