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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Soldering Tips Helpful Link: But National discontinued this part last year with no clear replacement.

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Open Positions To see a list of open positions, click here. This is probably not the way to go unless there is a need for an LED bargraph in the circuit already.

Octopart is not comprehensive. The transistors might be on separate dies for all I know. I’d rather the LOG and skip the Maxim hassle.

MikeJ-UK 5, 11 To see a list datassheet open positions, click here. That would more-or-less be an interpolation between 3dB values. This circuit uses the difference of two transistor currents to generate the log of the input over a pretty wide range. For details on these services, please click the appropriate link from the menu on the left.


LM Datasheet(PDF) – National Semiconductor (TI)

The specs are identical to the original. There is no commitment that if you design it in to your circuit, you will be able to purchase it later. For example, does not search Maxim-Direct, i. I can use LM array, but the specs are far worse. As usual, Maxim parts do not exist.

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. Our People Search the directory for faculty or staff members. TI has a bunch of chips that implement log amps. Especially in this circuit, which lives and dies by transistor matching, the simulator is going to give a very optimistic performance estimate.

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.

Would you like to answer one of these unanswered questions instead? 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.


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. Roman has mentioned that component. That’s an interesting forum thread, especially the story about MAT Joseph Perkins 1 1. TI isn’t making the part at all as far as I can tell.

You can find them here But the plant does not sell them directly.

The well-matched transistor pair Q1a and Q1b are halves of the LM “supermatch” transistor pair. I had this idea for a quick and dirty log amp. There are plenty of arrays of ‘ or ‘ available, but there is no mention of matching in the datasheet. TI still lists the part in their catalog, but designates it as obsolete. Devices equivalent to the LM are now being made by another company: The chip has almost the same name: Two LMs can be stacked to get 60 dB range. Maxim direct is saying 15 weeks lead time for single parts.

What is the new standard log amp circuit?

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