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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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TI has a bunch of chips that implement log amps. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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As usual, Maxim parts do dagasheet exist. This circuit looks to be a log amplifier using two op-amps, two transistors, a few passives and a current source.

Roman has mentioned that component. Joseph Perkins 1 1.

I’m not sure to what extent other parameters would matter, though. How about the LS from Linear Systems? I can use LM array, but the specs are far worse.

TI still sells some Burr Brown log amps but they are expensive. Engineering Program is accredited by: Soldering Tips Helpful Link: For example, does not search Maxim-Direct, i. This circuit uses the difference of two transistor datasueet to generate the log of the input over a l3m94 wide range. I’d rather the LOG and skip the Maxim hassle. It seems that this is not recommended for new designs but the replacement is the MAT So Maxim doesn’t have any either.


How can I cheaply make a logarithm? Those “transistors” are identical.

To see a list of open positions, click here. TI still lists the part in their catalog, but designates it datasheeet obsolete. Home Questions Tags Lm349 Unanswered. Intersil dwtasheet a number of transistor arrays some are certainly single die and well matched. 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.

I just get the default circuit. Devices equivalent to the LM are now being made by another company: Open Positions To see a list of open positions, click here.

MAT12 is still in production, but octopart. Search the directory for faculty or staff members. You can also see open positions in the department.

Two LMs can be stacked to get 60 dB range. There are plenty of arrays of ‘ or ‘ available, but there is no mention of matching in the datasheet.


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Octopart is not comprehensive. But National discontinued this part last year with no clear replacement. Prices are subject to change without notice.

Especially in this circuit, which lives and dies by transistor matching, the simulator is going to give a very optimistic performance estimate. I tried adjusting the Hfe of the transistors and unless it was something like it kept a very clean log output. The transistors might be on separate dies for all I know. In addition to supporting the various datsheet in the EL building, we also provide equipment and manual check-out and a wide range of electronic components for sale.

So no cheaper than the LOG If you modulated the reference voltage by 3dB, the output would probably average to about the right value. They are just listing the National Semi datasheet as a courtesy since they bought National.

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TI isn’t making the part at all as far as I can tell.