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I'm struggling to identify the origin of the IC in the attached image. I believe it is a rebadged HP/Agilent part:1826-1488, ADC CMOS 12-BIT 20-PIN. can you tell from the logo who makes it then I can try to track the original part number and perhaps find a replacement part if no longer in production.

it's in a HP system power supply (HP 6624A).

enter image description here

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  • \$\begingroup\$ That looks like an old National Semiconductor logo. \$\endgroup\$ – brhans Jun 11 '18 at 20:09
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    \$\begingroup\$ It's a National Semi logo, with an Agilent/HP internal part number. That means National made a "custom" version (maybe just modified test parameters, or maybe just custom marking, maybe a completely custom design) for HP/Agilent. \$\endgroup\$ – The Photon Jun 11 '18 at 20:10
  • \$\begingroup\$ @brhans I would think it's Analog Devices (AD). Unless it is explicitly telling us it is an ADC... \$\endgroup\$ – Eugene Sh. Jun 11 '18 at 20:10
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    \$\begingroup\$ TI bought NSC look there \$\endgroup\$ – Sunnyskyguy EE75 Jun 11 '18 at 20:11
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    \$\begingroup\$ @EugeneSh., I dunno what the "AD" stands for, but compare it to this part: cpu-world.com/CPUs/32016/… \$\endgroup\$ – The Photon Jun 11 '18 at 20:12
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You are correct about the HP part number. The cross reference from this HP cross reference guide is shown below. Note that it is marked as "SELECTED". This means that it was a selected for specific characteristics, as described in the second snippet from the document shown below.

The part is apparently out of production, but there are a few of the National Semiconductor version currently on eBay. They have a 1989 date code, but are listed as unused.

Here is a link to the datasheet for the National Semiconductor part.

enter image description here

enter image description here

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  • \$\begingroup\$ So it looks like the OP needs to source an old DAC1230, and that it's a DAC, not an ADC. \$\endgroup\$ – brhans Jun 11 '18 at 21:26

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