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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There are plenty of arrays of ‘ or ‘ available, but there is no mention of matching in the datasheet. The ECE Store provides many services to electrical and computer engineering students in datasheey to create a safe environment in which students have access to the equipment and parts they need.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Because it has attracted low-quality or spam datasjeet 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 had this idea for a quick and dirty log amp. I’m not sure to what extent other parameters l3m94 matter, though. Maxim direct is saying 15 weeks lead time for single parts.

LM Datasheet(PDF) – National Semiconductor (TI)

They are just listing the National Semi datasheet as a courtesy since they bought National. As usual, Maxim parts do not exist. Engineering Program is accredited by: Roman has mentioned that component. Intersil makes a number of transistor arrays some are certainly single die and well matched.


LM Datasheet, PDF – Alldatasheet

For details on these services, dayasheet click the appropriate link from the menu on the left. Those “transistors” are identical. TI isn’t making the part at all as far as I can tell. How can I cheaply make a logarithm?

It seems that this is not recommended for new designs but the replacement is the MAT TI still lists the part in their catalog, but designates it as obsolete. Home Questions Tags Users Unanswered. Would you like to answer one of these unanswered questions instead?

What is the new standard log amp circuit? However, I’m not sure how suitable it is for your application. The transistors might be on separate dies for all I know. I can use LM array, but the specs are far worse.

So Maxim doesn’t have any either. Welcome to dstasheet ECE Store. I tried adjusting the Hfe of the transistors and unless it was something like it kept a very clean log output. You can also see open positions in the department. 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.

Search the directory for faculty or staff members. The chip has almost the same name: Thank you for your interest in this question. I don’t know what the definitive chip is but there are many chips that implement the whole circuit. Octopart is not comprehensive. This circuit looks to be a log amplifier using two op-amps, two transistors, a few passives and a current source. To see a list of open positions, click here.


But National discontinued this part last year with no clear replacement. For example, does not search Maxim-Direct, i. That’s an interesting forum thread, especially the story about MAT Facilities Lab Research in the department is conducted in a variety of laboratories equipped with state-of-the-art equipment, with research funding coming from federal, state, and private sources.

MikeJ-UK 5, 11 So no cheaper than the LOG Our People Search the directory for faculty or staff members. Chris Johnson 7 The traditional logarithmic amplifier circuit is described in National Appnote This is probably not the way to go unless there is a need for an LED bargraph in the circuit already. You have to find the dealer in Moscow can find an email or phone in case someone need it.

TI has a bunch of chips that implement log amps.

Welcome to the ECE Store

There is no commitment that if you design it in to your circuit, you will be able to purchase it later. Especially in this circuit, which lives and dies by transistor matching, the simulator is going to give a very optimistic performance estimate.

You can find them here But the plant does not sell them directly. MAT12 is still in production, but octopart.

Two Lm94 can be stacked to get 60 dB range. The well-matched transistor pair Q1a and Q1b are halves of the LM “supermatch” transistor pair.

Joseph Perkins 1 1.