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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Intersil makes datasheer number of transistor arrays some are certainly single die and well matched. The chip has almost the same name: For details on these services, please click the appropriate link from the menu on the left. I just get the default circuit. TI still sells some Burr Brown log amps but they are expensive. MikeJ-UK 5, 11 The well-matched transistor pair Q1a and Q1b are halves of the LM “supermatch” transistor pair.

Devices equivalent to the LM are now being made by another company: They are just listing the National Semi datasheet as a courtesy since they bought National.

MAT12 is still in production, but octopart. I don’t know what the definitive chip is but there are many chips that implement the whole circuit. You can find them here But the plant does not sell l394 directly.

Octopart is not comprehensive. Chris Johnson 7 Soldering Tips Helpful Link: Search the directory for faculty or staff members. There are plenty of arrays of ‘ or ‘ available, but there is no mention of matching in the datasheet.


Thank you for your interest in this question. How can I cheaply make a logarithm? The transistors might be on separate dies for all I know.

But National discontinued this part last year with no clear replacement. This circuit looks to be a log amplifier using two op-amps, two transistors, a few passives and a current source. So no cheaper than the LOG Prices are subject to change without notice. Home Questions Tags Users Unanswered. TI has a bunch of chips that implement log amps. Spring Semester, Monday — Friday: I can use LM array, but the specs are far worse.

You can also see open positions in the department.

There is no commitment that if you design it in to your circuit, you will be able to purchase it later. To see a list of open positions, click here. It seems that this is not recommended for new designs but the replacement is the MAT I’d rather the LOG and skip the Maxim hassle.

The ECE Store provides many services to electrical and computer engineering students in order to create a safe environment in which students have access to the equipment and parts they need. 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.

How about the LS from Linear Systems? I tried adjusting the Hfe of the transistors and unless it was something like it kept a very clean log output. I’m not sure to what extent other parameters would matter, though. The traditional logarithmic amplifier circuit is described in National Appnote Would you like to answer one of these unanswered questions instead?


That would more-or-less be an interpolation between 3dB values. Those “transistors” are identical. Open Positions To see a list of open positions, click here. Engineering Program is accredited by: Welcome to the ECE Eatasheet.

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TI isn’t making the part at all as far as I can tell. This circuit uses the difference of two transistor currents to generate the log of the input over a pretty wide range. So Maxim doesn’t have any either.

I dagasheet this idea for a quick and dirty log amp. The specs are identical to the original. If you modulated the reference voltage by 3dB, the llm394 would probably average to about the right value. As usual, Maxim parts do not exist.

Maxim direct is saying 15 weeks lead time for single parts. 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.