Source or alternate for LM7810ACT Voltage Regulator?

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wendallsan
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Source or alternate for LM7810ACT Voltage Regulator?

Post by wendallsan » Tue Jan 07, 2020 11:14 am

Hi all,

I'm sourcing parts for some Toppobrillo 281 Dual Function Generator modules, and the module calls for a "LM7810ACT Linear Voltage Regulator 10V 1A 2%". I've not been able to find this part in my usual sources, which includes Mouser and Tayda. Can anyone tell me where I can find this part, or alternately if a different voltage regulator could be swapped out? The part is listen on Mouser as 'obselete.'
Student at Evergreen State College's "Advanced Electronics In Music" for the 2019-2020 school year. Built a Roland System 700 clone out of Pharmasonic PCB's. Currently building and/or troubleshooting: DJ Thomas White Quad Lowpass Gate, MMI TwoNineFive 10-Channel Comb Filter, Barton Bytewise Operator + Expander, AI Synthesis AI004 VCF, 2 Weston Audio 2VL1's, and 4 Toppobrillo 281's.

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SyndieBot2000XL
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Re: Source or alternate for LM7810ACT Voltage Regulator?

Post by SyndieBot2000XL » Tue Jan 07, 2020 11:27 am

How about Lm7810CT?

https://www.digikey.com/product-detail/ ... ND/1954730

Seems to be the same part, except it will operate down to -40c rather than just 0. Also listed as obsolete, but they still have 60 some in stock. I usually get oddball voltage regs from eBay if mouser, tayda, or jameco can’t help.
It began as a mistake.

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wendallsan
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Re: Source or alternate for LM7810ACT Voltage Regulator?

Post by wendallsan » Tue Jan 07, 2020 12:38 pm

Alas, that part on digikey has a price of "ERROR" and cannot be added to my cart. I did find a seller on eBay that I was able to get some from, though, so thanks for the tip there! One more piece acquired! :party:
Student at Evergreen State College's "Advanced Electronics In Music" for the 2019-2020 school year. Built a Roland System 700 clone out of Pharmasonic PCB's. Currently building and/or troubleshooting: DJ Thomas White Quad Lowpass Gate, MMI TwoNineFive 10-Channel Comb Filter, Barton Bytewise Operator + Expander, AI Synthesis AI004 VCF, 2 Weston Audio 2VL1's, and 4 Toppobrillo 281's.

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Re: Source or alternate for LM7810ACT Voltage Regulator?

Post by KittenVillage » Tue Jan 07, 2020 7:01 pm

LCSC has one with similar specs. (Just happened to have them open, they have .1% smd resistors cheaper than anywhere.)

https://lcsc.com/product-detail/Linear- ... 95077.html
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megaohm
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Re: Source or alternate for LM7810ACT Voltage Regulator?

Post by megaohm » Tue Jan 07, 2020 7:16 pm

For that project (most others, too) you do not need any special part number. Play fast and loose with the letters.
It is a 10V regulator. It's footprint is TO-220 (listed as TO-220-3).
Just search "7810" and look under semiconductors.
Plenty to chose from:
https://www.mouser.com/Semiconductors/P ... 10&FS=True

https://www.mouser.com/Semiconductors/P ... 10&FS=True

Ebay for parts is a crap shoot.
www.MegaOhmAudio.com

Will work for pistachios

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Re: Source or alternate for LM7810ACT Voltage Regulator?

Post by ixtern » Wed Jan 08, 2020 2:27 am

The main difference between LM7810A and LM7810 is output voltage precision. LM7810A has output voltage tolerance +-2% while LM7810 has +-4%. Temp stability is the same. Even if ouput voltage is used for reference somewhere, you can sort standard LM7810 to choose one with proper tolerance. Or maybe it doesn't matter - only schematic can tell the truth.

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Kent
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Re: Source or alternate for LM7810ACT Voltage Regulator?

Post by Kent » Tue Jan 14, 2020 5:20 am

Does anyone know if the TO-92 package version of any variant or the 7810 has been discontinued?
I can't find them at the local stores (no stock).
Mouser has none.
Farnell has them in limited stock

Is this being phased out?

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Bodo1967
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Re: Source or alternate for LM7810ACT Voltage Regulator?

Post by Bodo1967 » Tue Jan 14, 2020 5:42 am

Kent wrote:
Tue Jan 14, 2020 5:20 am
Does anyone know if the TO-92 package version of any variant or the 7810 has been discontinued?
I purchased some off (German) Ebay a while ago, and they're still available there for next to nothing if you don't mind them being sent from China. The ones I received worked just fine.

@Kent: I just tried to pm you, but the board told me the recipient (a.k.a. you) don't exist?! :hmm:
... why buy it for $100 when you can build it yourself for $150?

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emmaker
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Re: Source or alternate for LM7810ACT Voltage Regulator?

Post by emmaker » Tue Jan 14, 2020 1:06 pm

This came up the other day in a different tread.

LM2940T-10

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Re: Source or alternate for LM7810ACT Voltage Regulator?

Post by mrand » Tue Jan 14, 2020 1:33 pm

I couldn't find TO-92 78L10 on ebay either.
SMD version was easy to find though.
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EATyourGUITAR
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Re: Source or alternate for LM7810ACT Voltage Regulator?

Post by EATyourGUITAR » Tue Jan 14, 2020 2:05 pm

you need to look at linear voltage regulators. then filter by voltage +10v. then filter by TO-92 and TO-92-3. they are the same thing but you need to hold ctrl while selecting more than one value to filter. I got 5 results. 4 part numbers in stock.

this one 2,410 In Stock
https://www.mouser.com/ProductDetail/UA78L10ACLP
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Bodo1967
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Re: Source or alternate for LM7810ACT Voltage Regulator?

Post by Bodo1967 » Tue Jan 14, 2020 3:42 pm

Bodo1967 wrote:
Tue Jan 14, 2020 5:42 am
I purchased some off (German) Ebay a while ago, and they're still available there for next to nothing if you don't mind them being sent from China. The ones I received worked just fine.
Aaaaargh. Mine are TO-220, not TO-92 :bang: . They do the same thing but are considerably bigger.

78L10 (the TO-92 package) is also offered on Ebay, however. Not really expensive so it's worth a try. Just test them to see if they put out the proper voltage before connecting them to any valuable circuit :despair: .
... why buy it for $100 when you can build it yourself for $150?

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EATyourGUITAR
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Re: Source or alternate for LM7810ACT Voltage Regulator?

Post by EATyourGUITAR » Wed Jan 15, 2020 2:57 pm

Bodo1967 wrote:
Tue Jan 14, 2020 3:42 pm
Just test them to see if they put out the proper voltage before connecting them to any valuable circuit :despair: .
test them with a load %20 bigger than the max current draw for your application. check vdc and vac. if the ripple is bad then they could be junk, or they could be low power versions. it is hard to reference a datasheet when you have a mystery part from ebay.
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