opamp K153UD5 - datasheet [solved] - uA725, now what to build? - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: September 17, 2022, 04:34:56 pm
content: Found a couple of K153UD5 op-amps while digging through the inventory, NOS, looking like these:https://pentod.com/product/4895/k153ud5-pecision-low-noise-op-amp-gold-ussr.html.enIts cross-reference seems to be LM725, and the datasheet for LM725 is available online. However, I couldn't find any datasheet for the K153UD5 itself.Anybody can link or attach the datasheet for K153UD5, please?

author: wraper
author_rank: Unknown
timestamp: September 17, 2022, 04:42:28 pm
content: Here

author: ataradov
author_rank: Super Contributor
timestamp: September 17, 2022, 04:43:25 pm
content: Here is manufacturer's datasheet in Russian.Edit: Seems to be the same aswraperposted, just a different formatting.

author: RoGeorge
author_rank: Super Contributor
timestamp: September 17, 2022, 04:47:01 pm
content: Thank you very much.Great that the text can be selected, and not an image scan, so it can translate it with Google.

author: Vovk_Z
author_rank: Super Contributor
timestamp: September 17, 2022, 11:48:09 pm
content: Google may make mistakes in translating technical terminology, so feel free to ask questions.

author: RoGeorge
author_rank: Super Contributor
timestamp: September 18, 2022, 09:10:03 am
content: You are too kind, thank you. Didn't translate it yesterday, because the datasheet mentions uA725, so downloaded the datasheet for uA725 and read that one instead. However, you made me curious, and gave translate.google.com a try this morning. Attached is the En pdf returned. No idea how accurate the translation is. Did Google translated it good enough?Searched a little more today about uA725, and found out (at page 59 of 970 inhttp://www.miedema.dyndns.org/co/2018/Op_Amp_Applications_Handbook-Walt-Jung_2005.pdf)QuoteIn the same pdf, it's an entire chapter describing the internals of the uA725 opamp, wow!"Precision Bipolar IC Op Amps— μA725 to the OP07 families" starting at page 61 of 970.The question now is what to build with low noise, low drift, precision opamps likeuA725?

author: iMo
author_rank: Super Contributor
timestamp: September 18, 2022, 09:32:05 am
content: Send it to Noopy..

author: Vovk_Z
author_rank: Super Contributor
timestamp: September 18, 2022, 04:56:32 pm
content: Напряжение смещения нуля - Input Offset VoltageМакс. вых. напряж. - Output Voltage SwingСредний входной ток - Average Input Offset CurrentРазность входных токов - Input Bias CurrentКоэф. усиления напр. - Voltage GainКоэф. ослаб. синфазных входных напр - Common-Mode Rejection RatioКоэф. влияния нестабильности источ. питания на напр. смещения - Power Supply Rejection RatioСредний температур дрейф напряжения смещ. нуля - Average Voltage DriftСредний темпер. дрейф разносности входн. токов - Input Bias Current Drift***ABSOLUTE MAXIMUM RATINGSСинфазное входное напряжение, В - Common Mode Input Voltage, V

author: Vovk_Z
author_rank: Super Contributor
timestamp: September 18, 2022, 04:58:29 pm
content: Quote from: RoGeorge on September 18, 2022, 09:10:03 am- anything that can be built with e.g. OP07, or any other typical precision opamp.

author: David Hess
author_rank: Super Contributor
timestamp: September 18, 2022, 06:11:14 pm
content: Quote from: Vovk_Z on September 18, 2022, 04:58:29 pmExactly, the uA725 is the precursor to the OP07, or really the OP05 which is an untrimmed OP07, and is suitable for the same applications. Note that using the external offset voltage adjustment on this parts simultaneously trims the offset voltage drift.The external compensation of the uA725 allows some things that modern parts do not support. Its external compensation allows tailoring its frequency response, and the compensation pin can also be used to clamp its output.

author: RoGeorge
author_rank: Super Contributor
timestamp: September 24, 2022, 02:06:53 pm
content: Very important for cross reference replacements, the key for the metal-can Russian opamps markspin 1, while for the western opamps the key markspin 8.BTW, found something useful to build for the lab (with these opamps): Power amplifier for the signal generator.https://www.eevblog.com/forum/projects/precision-opamp-power-stage-to-increase-v-and-i-out/