Author Topic: Agilent E3640A Obsolete part need some help  (Read 1996 times)

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Offline WuLi

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Agilent E3640A Obsolete part need some help
« on: October 25, 2015, 07:55:48 pm »
Hi,
I have an Agilent E3640A PS with a defective CS8122 voltage regulator. This voltage regulator was fabricated by On Semiconductors and it became obsolete. I've been looking around the internet trying to find this part but I've been unsuccessful so far. I don't have experience with finding replacements for obsolete parts. Can anybody give me a hand on finding a replacement for this part? Thanks in advance.
John
 

Offline tautech

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Re: Agilent E3640A Obsolete part need some help
« Reply #1 on: October 25, 2015, 07:57:55 pm »
Hi,
I have an Agilent E3640A PS with a defective CS8122 voltage regulator. This voltage regulator was fabricated by On Semiconductors and it became obsolete. I've been looking around the internet trying to find this part but I've been unsuccessful so far. I don't have experience with finding replacements for obsolete parts. Can anybody give me a hand on finding a replacement for this part? Thanks in advance.
John
CS8122 package?
Link to datasheet?
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Offline WuLi

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Re: Agilent E3640A Obsolete part need some help
« Reply #2 on: October 25, 2015, 08:00:48 pm »
Sorry,
I forgot that. It's the CS8122YTVA5 Vertical TO220 Package as listed in the datasheet. I've attached the datasheet.
John
 

Offline free_electron

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Re: Agilent E3640A Obsolete part need some help
« Reply #3 on: October 26, 2015, 01:30:01 am »
That thing was originally made by cherry semiconductors , later borged by ON SEMI.

Lp2957 could do it but cant do more than 300mA ...

I weeded out possible candidates. You will have to check their pinout.
You can mimic the delayed start by adding an r and c to the enable pin.

http://www.digikey.com/product-search/en?pv16=8696&pv16=8698&pv16=12652&pv16=287&pv16=12742&pv16=8169&pv16=8881&pv16=991&pv16=12745&FV=fff40027%2Cfff80182%2Cc00001&k=Regulator&mnonly=0&newproducts=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25
« Last Edit: October 26, 2015, 01:46:19 am by free_electron »
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Online Jay_Diddy_B

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Re: Agilent E3640A Obsolete part need some help
« Reply #4 on: October 26, 2015, 01:58:25 am »
Hi,

This may help.

Here is the schematic from the E3633A:



It uses the LM2925T this looks to be pin compatible with the CS8122. Here is a link to the datasheet:

http://www.ti.com.cn/cn/lit/ds/symlink/lm2925.pdf

Good Luck,

Jay_Diddy_B
 

Offline WuLi

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Re: Agilent E3640A Obsolete part need some help
« Reply #5 on: October 26, 2015, 03:01:50 am »
Thank you guys for your input. Someone at the Agilent / hp user groups pointed out the LM2925 device to me. It seems to be compatible with the CS8122. I've ordered this device and will test it in my unit as soon as it comes in. Thanks again.
John
Jay_Diddy_B You've found it to ;-) I'll ley you guys know if it works...
« Last Edit: October 26, 2015, 03:03:42 am by WuLi »
 


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