General Description. The AS and AS are junction isolated ultra well- matched monolithic NPN transistor pairs with an order of magnitude improvement in. LM/LM Supermatch Pair. General Description. The LM and LM are junction isolated ultra well- matched monolithic NPN transistor pairs with an. LM datasheet, LM circuit, LM data sheet: NSC – LM/LM Supermatch Pair,alldatasheet, datasheet, Datasheet search site for Electronic.

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The traditional logarithmic amplifier circuit is described in National Appnote This circuit looks to be a log amplifier using two op-amps, two transistors, a few passives and a current source.

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It seems that this is not recommended for new designs but the replacement is the MAT If you modulated the reference voltage by 3dB, the output would probably average to about the right value. I had this idea for a quick and dirty log amp. Those “transistors” are identical. So Maxim doesn’t have any either. Prices are subject to change without notice. You can also see open positions in the department.

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Spring Semester, Monday — Friday: Search the directory for faculty or staff members. The specs are identical to the original. I can use LM array, but the specs are far worse. Joseph Perkins 1 1. There are plenty of arrays of ‘ or ‘ available, but there is no mention of matching in the datasheet.

LM Datasheet, PDF – Alldatasheet

Our People Search the directory for faculty or staff members. Intersil makes a number of transistor arrays some are certainly single die and well matched.

Devices equivalent to the LM are now being made by another company: MAT12 is still in production, but octopart. TI still lists the part in their catalog, but designates it as obsolete. Roman has mentioned that component. But National discontinued this datashee last year with no clear replacement. Chris Johnson 7 Would you like to answer one of these unanswered questions instead?

They are just listing the National Semi datasheet as a courtesy since they bought National.

I don’t know what the definitive chip is but datahseet are many chips that implement the whole circuit. You have to find the dealer in Moscow can find an email or phone in case someone need it.

TI isn’t making the part at all as far as I can tell. So no cheaper than the LOG By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. That would more-or-less be datasheer interpolation between 3dB values. Octopart is not comprehensive.


Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count. In addition to supporting the various labs in the EL building, we also provide equipment and manual check-out and a wide range of electronic components for sale. MikeJ-UK 5, 11 This circuit uses the difference of two transistor currents to generate the log of the input over a pretty wide range.

Especially in this circuit, which lives and dies by transistor matching, the simulator is going to give a very optimistic performance estimate. Soldering Tips Helpful Link: That’s an interesting forum thread, especially the story about MAT There is no commitment that if you design it in to your circuit, you will be able to purchase it later.

However, I’m not sure how suitable it is for your application.

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