Are there any high voltage transistor arrays, besides STA404A and MPQ7043? - Page 1
Forum section: electronics / beginners

author: LinuxHata
author_rank: Frequent Contributor
timestamp: February 26, 2023, 07:46:44 am
content: Hello.For a beginner project, I need an easy to solder, DIP Transistor array. More transistors in one package is better. The requirements are at least 50mA current per transistor and 200V CE breakdown voltage. By googling I come to two variants, these are SanKen STA404A, and Centralsemi's MPQ7043. Neither are cheap or easy to find, so maybe there are some other variants available, which I missed?

author: f4eru
author_rank: Super Contributor
timestamp: February 26, 2023, 06:36:23 pm
content: why not use separate components if arrays are not available ?

author: LinuxHata
author_rank: Frequent Contributor
timestamp: February 26, 2023, 08:02:27 pm
content: For a various reasons.

author: Jwillis
author_rank: Super Contributor
timestamp: February 26, 2023, 11:35:04 pm
content: A lot of those high voltage components are obsolete now simply because theirs no demand as much now as in the past.You could try broadening your requirements . Do you need 200V Vce or can you go with something a bit lower or maybe higher.Does it need to be BJT ? What about Mosfet arrays or IGBT full bridge arrays .You could try searching 3 phase or 5 phase motor drive arrays . example:https://www.digikey.com/en/products/detail/sanken/SMA5131/4289336or for examplehttps://www.semicon.sanken-ele.co.jp/sk_content/sla5068_ds_en.pdfCan you use multiple packages with fewer transistors per package?You'll have trouble finding much in a very small package arrays because of the dielectric strength of the material prevents it.Edited to clarify my meaning.

author: TimFox
author_rank: Super Contributor
timestamp: February 26, 2023, 11:41:09 pm
content: For high voltage low current switching, I have had good luck with the 4-pin DIP packaged HexFets, originally from International Rectifier.Here is a typical datasheets:https://www.mouser.com/datasheet/2/427/sihfd224-1768527.pdfhttps://www.digchip.com/datasheets/download_datasheet.php?id=437344&part-number=IRFD420The 4-pin DIPs (0.20 in wide) can be stacked laterally in standard DIP sockets or pad patterns to form an array in the same space as a DIP.

author: langwadt
author_rank: Super Contributor
timestamp: February 27, 2023, 02:21:08 am
content: Quote from: LinuxHata on February 26, 2023, 08:02:27 pmsuch as?

author: LinuxHata
author_rank: Frequent Contributor
timestamp: February 27, 2023, 03:57:53 am
content: It can be mosfet or igbt, but these will be more expensive and physically larger I guess?The aim is to have fewer components for a beginner diy project, for ease of putting things together.

author: Kleinstein
author_rank: Super Contributor
timestamp: February 27, 2023, 08:33:58 am
content: Excotic transistor arrays are relatively rare parts and there is a chance they may get obsolete. So unless really needed (e.g. need thermal coupling) I would avoid them.For a beginner project it helps to have parts that are easy to get. Single transistors also allow for an easier replacement. Parts in a TO126 case are relatively easy to solder. There are also some SMD parts (SOT223 or similar) that are relatively easy to solder and hard to mount the wrong way around.

author: mariush
author_rank: Super Contributor
timestamp: February 27, 2023, 09:11:52 am
content: Your requirements don't really match with the parts you gave as example ... the Sanken part for example is an array of 4 Darlington , with a beta/hFe of 1000 and resistors built in.An a "beginner dyi project" coupled with high voltage? You have people that don't mind working with high voltage but are picky about surface mount components?You can get individual transistors in TO92 (through hole) packages for 10 cents in quantity, like MPSA42/43 , KSP42TA etc .. through they have kind of low gain but you said 50mA, so if you have to push 2-3 mA into the base it shouldn't be a big deal.There's surface mount transistors with higher gains, like for example these ones with gain of 100FCX458TA : 400v 0.225A SOT89-3https://www.digikey.com/en/products/detail/diodes-incorporated/FCX458TA/260713The middle pin (collector) is connected to the tab on the other side, so if you want to make even more beginner friendly you could cut the middle pin short to make more spacing and make it easier to solder.FFMT497TA : 300v 0.5A SOT23-3https://www.digikey.com/en/products/detail/diodes-incorporated/FMMT497TA/92673Gain of around 80. You have to be blind to not be able to solder the pins with how much spacing you have. Could even bend the pins and make it through hole, but it's spacing of 2 mm-ishFZT857 : 300v 3.5A sot223-3https://www.digikey.com/en/products/detail/diodes-incorporated/FZT857TA/96593gain of 100 ... even bigger tab, same as above you could cut the middle pin to make more safe to solder for beginners, with around 4.5mm between the pins should be quite easy to solder to some big pads.

author: LinuxHata
author_rank: Frequent Contributor
timestamp: February 27, 2023, 07:08:36 pm
content: It should be cheap and it should be thru-hole. DC gain and frequency response have no practical meaning, since working currents will be within 5mA and switching speeds below 1hz, but voltage should be 200 volts at least.I mentioned STA404A just as an example of such hv transistor assembly. I don't need any of it's specs.In fact, I'm considering making own DIP-16 sized assembly with 6 MMDTA42s in it. I already made PCB for that.

author: TimFox
author_rank: Super Contributor
timestamp: February 27, 2023, 08:27:32 pm
content: Again, I suggest you look at those high-voltage hexfets in 4-DIP (0.20 in wide) package: four of them fit nicely into a 16-pin footprint and will match protoboards nicely for THT construction.The webbed foot on the two pins for the drains give a bit of heatsinking. Many (if not all) of the N-channel devices can be driven directly from TTL levels, and they are available in both polarities.

author: LinuxHata
author_rank: Frequent Contributor
timestamp: February 28, 2023, 04:46:24 am
content: Thanks, I checked these, but they're expensive.Currently, I can buy MPQ7043 for about $1.10 - same price as IRFD244.I was hoping to fit into sub 50 cent area, by the way

author: DavidKo
author_rank: Frequent Contributor
timestamp: February 28, 2023, 05:27:53 am
content: Dave did some video about searching the components. Take some big distributor like Mouser, DigiKey, etc. Put there the parameters you want and sort according the price. If you do not buy bulk, than you will pay premium.

author: langwadt
author_rank: Super Contributor
timestamp: February 28, 2023, 07:53:38 am
content: Quote from: LinuxHata on February 28, 2023, 04:46:24 am< $0.05https://www.lcsc.com/product-detail/Bipolar-Transistors-BJT_Jiangsu-Changjing-Electronics-Technology-Co-Ltd-A44_C66967.html