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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I can use LM array, but the specs are datqsheet worse. Intersil makes a number of transistor arrays some are certainly single die and well matched. Those “transistors” are identical.

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I’d rather the LOG and skip the Maxim hassle. However, I’m not sure how suitable it is for your application. For example, does not search Maxim-Direct, i. The traditional datasheeh amplifier circuit is described in National Appnote Our People Search the directory for faculty or staff members.

Roman has mentioned that component.

I had this idea for a quick and dirty log amp. I just get the default circuit. The chip has almost the same name: 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.

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. That’s an interesting forum thread, especially the story about MAT The well-matched transistor pair Q1a and Q1b are halves of the LM “supermatch” transistor pair.


Two LMs can be stacked to get 60 dB range. 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. Engineering Program is accredited by: TI isn’t making the part at all as far as I can tell.

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.

Search the directory for faculty or staff members. This is probably not the way to go unless there is a need for an LED bargraph in the circuit already. TI still sells some Burr Brown log amps but they are expensive. There are plenty of arrays of ‘ or ‘ available, but there is no mention of matching in the datasheet. Chris Johnson 7 How about the LS from Linear Systems? To see a list of open positions, click here. There is no commitment that if you design it in to your circuit, you will be able to purchase it later.

Would you like to answer one of these unanswered questions instead? So Maxim doesn’t have any either. 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.


If you modulated the reference voltage by 3dB, the output would probably average to about the right value. As usual, Maxim parts do not exist.

That would more-or-less be an interpolation between 3dB values. You can find them here But the plant does not sell them directly.

You can also see open positions in the department. 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. Thank you for your interest in this question. L,394 National discontinued this part last year with no clear replacement.

Prices are subject to change without notice. MAT12 is still in production, but octopart.

LM Datasheet(PDF) – National Semiconductor (TI)

Devices equivalent to the LM are now being made by another company: For details on these services, please click the appropriate link from the menu on the left. It seems that this is not recommended for new designs but the replacement is the MAT I don’t know what the definitive chip is but there are many chips that implement the whole circuit.

Welcome to the ECE Store. The specs are identical to the original. What is the new standard log amp circuit?