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| Why is the 741 op amp still produced? |
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| Zero999:
--- Quote from: Kleinstein on September 27, 2020, 02:52:38 pm ---The LM321 are an odd product: quite a few of the LM321 versions seem to be actually LM358 dies using only one half: the supply current is usually the same as both OPs from the LM358 and not halve (or only slightly more) :palm:. There seem to be a few now with lower current (e.g. from ONS). For low voltage use (e.g. up to 5 V) there are quite a few affordable rail to rail CMOS OPs (e.g. MCP600x) - maybe not cheaper than the LM321, but below the 741. One can also have a faster and less crossover distortion OP otherwise similar to the LM358 (e.g. MC33171-4) - this one could replace the 741 in most cases. --- End quote --- I've never used the LM321, just the LM358. If I only want one amplifier, I just disable the other. The only reason for the LM321 is to save board space. |
| bson:
It's pretty much the only single-channel DIP-8 op amp that can handle a 44V supply. Well, except the LF356 (JFET) and the LT1010. Cheap as dirt, too (unlike the LT part). |
| coppice:
--- Quote from: bson on September 27, 2020, 11:43:17 pm ---It's pretty much the only single-channel DIP-8 op amp that can handle a 44V supply. Well, except the LF356 (JFET) and the LT1010. Cheap as dirt, too (unlike the LT part). --- End quote --- It will be interesting to see what happens to these higher voltage parts as less and less fabs remain functional which can produce them. People do not seem to see enough market size to justify developing new high voltage parts right now, although I guess they will be forced to as the last ancient fabs close. Some people will always need high voltage operation. |
| james_s:
--- Quote from: coppice on September 27, 2020, 11:57:57 pm ---It will be interesting to see what happens to these higher voltage parts as less and less fabs remain functional which can produce them. People do not seem to see enough market size to justify developing new high voltage parts right now, although I guess they will be forced to as the last ancient fabs close. Some people will always need high voltage operation. --- End quote --- What about fabs making HV parts like mosfet drivers, SMPS ICs and that sort of thing? Couldn't they make HV op amps? The market for things like motor drives and power supplies isn't going anywhere. |
| Zero999:
--- Quote from: bson on September 27, 2020, 11:43:17 pm ---It's pretty much the only single-channel DIP-8 op amp that can handle a 44V supply. Well, except the LF356 (JFET) and the LT1010. Cheap as dirt, too (unlike the LT part). --- End quote --- Not all '741s are rated to 44V. The LM741C is only rated to 36V maxium. The classic OP07 and NE5532 will withstand 44V, but are only specified to ±20V. --- Quote from: james_s on September 28, 2020, 04:08:16 am --- --- Quote from: coppice on September 27, 2020, 11:57:57 pm ---It will be interesting to see what happens to these higher voltage parts as less and less fabs remain functional which can produce them. People do not seem to see enough market size to justify developing new high voltage parts right now, although I guess they will be forced to as the last ancient fabs close. Some people will always need high voltage operation. --- End quote --- What about fabs making HV parts like mosfet drivers, SMPS ICs and that sort of thing? Couldn't they make HV op amps? The market for things like motor drives and power supplies isn't going anywhere. --- End quote --- Not to mention high side current sensing. |
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