Looking for Datasheet for HP 1826-0570 Schmidt Amplifier - Page 1
Forum section: electronics / testgear

author: Wrenches of Death
author_rank: Regular Contributor
timestamp: June 01, 2022, 05:26:59 pm
content: Thanks in advance!WoD

author: Oldtestgear
author_rank: Regular Contributor
timestamp: June 02, 2022, 10:43:25 am
content: Cannot find this part# in any of the HP cross references that I have. All the similar part #s are for linear ICs.Sorry I cannot help.Phil

author: Uunoctium
author_rank: Frequent Contributor
timestamp: June 02, 2022, 12:14:38 pm
content: typed in your number at weisd.com and got NTE919 (eqivalent replacement for: 1826-0191, ECG919, LM319H, LM319K, NTE919, SK9217, SK9217/919)dual-high-speed comparator w. open collector TTL-compatible output10 lead metal TO-canhttps://www.nteinc.com/specs/900to999/pdf/nte919.pdf

author: Wrenches of Death
author_rank: Regular Contributor
timestamp: June 02, 2022, 05:49:38 pm
content: Quote from: Oldtestgear on June 02, 2022, 10:43:25 amI checked all of the HP xref files I could find. I went through them page by page rather than take the chance that the pdf file search would miss them. Some of the scans are pretty rough.I also checked for an NSN to see if there were alternative part numbers, but no luck. It appears that it was an HP only part that wasn't a normal off the shelf item.I was hoping that it was an off the shelf item that was "selected". There's a lot of information available forTektronix items like this, but not HP.I appreciate you checking though, many thanks!WoD

author: Wrenches of Death
author_rank: Regular Contributor
timestamp: June 02, 2022, 06:10:22 pm
content: Quote from: Uunoctium on June 02, 2022, 12:14:38 pmI hate to admit it, but it never occured to me to check ECG/NTE, thanks! I guess that I've slowed down as I gotten older.You've got me in the ball park now though!A pair of the 1826-0570 chips are used in the inputs of the HP 5335A counters and are pretty much non-existant in the spare parts department.The chips are fine in the pair of 5335A's that I have, but I wanted to head off possible problems in the future. I'd hate to have to scrap one somewhere down the line because of a two dollar IC that I can't find a replacement for.They are only 200Mhz counters. They max out somewhere around 270Mhz or so with 100uv input if I remember right. I can't help but wonder if the NTE919 would work in this application though. The datasheet lists a response time of only 80ns.Unless I'm missing something, that doesn't seem any where near fast enough handle triggering.thanks again,WoD

author: Uunoctium
author_rank: Frequent Contributor
timestamp: June 02, 2022, 07:24:34 pm
content: with the circuit, U2 & U5 are in and mfr. code 28480 = HP Palo Alto, I see no chance..."The Schmitt-Amplifier is a high performance, 500 MHz band width device with settable hysteresis and a built-in three-state trigger light circuit."Looks not like an 2$ item

author: Wrenches of Death
author_rank: Regular Contributor
timestamp: June 02, 2022, 08:44:31 pm
content: Quote from: Uunoctium on June 02, 2022, 07:24:34 pmHP used that CAGE code on a lot of stuff that they really didn't manfacture.I know what they look like, thanks. I have four of them within arms reach.It doesn't seem like HP would have used a 500Mhz part in a 200Mhz instrument unless that part was already in use in something else.I studied them a while back when I added heat sink compound to the heat sink on each of them. I figured it was worth the effort. I guess I'll have to keep an eye open and grab another working 5335A for parts. I was hoping for a smaller solution.Oh, "two dollar IC" is a figure of speech.I'd still like to find a datasheet on the little beast though.thanks,WoD

author: Uunoctium
author_rank: Frequent Contributor
timestamp: June 03, 2022, 01:26:58 pm
content: 'borrowed' the image from an japanese blog who published a lot of pictures from the HP's 5335A inside.U2 U5 are labeled -0999 instead -0570, possibly the successor or HP's drop-in replacement.You can order 1826-0999 at ASAP Semiconductor LLC.1209 in stock!https://www.asapsemi.com/manufacturer-hp/page3.aspxMax 15 minutes response-time after your inquiry!https://www.asapsemi.com/rfq.aspx?id=1826-0999&mfr=hp

author: Wrenches of Death
author_rank: Regular Contributor
timestamp: June 05, 2022, 01:55:52 pm
content: Quote from: Uunoctium on June 03, 2022, 01:26:58 pmInteresting, thanks. Another part number to ponder!Do you have a link handy to the Japanese site? I'm curious as to the SN prefix of the instrument and the date codes on other components it contains.I'd almost bet money that the -0570 was used in other instruments. Using an expensive 500Mhz bandwidth chip in a 200Mhz instrument would only be cost effective if the -0570 was already available when the 5335A was designed and they were looking to save "start up" production costs of the 5335A.It might be possible that the -0999 were -0570's that didnt' meet full 500Mhz spec. Perhaps along the lines of the Tektronix 155-078-xx Minipac grading system. There must have been a half a dozen different of those, all graded by speed.thanks!WoD

author: Wrenches of Death
author_rank: Regular Contributor
timestamp: June 05, 2022, 03:32:09 pm
content: Quote from: Uunoctium on June 03, 2022, 01:26:58 pmA quick followup to my reply:I've been doing some more digging. It appears that the -0570 was "first". The -0999 was "second". And, then there was a third number chip number. It was 1DV8-0001The 90044 manual gives the SN prefixs of when the manual changes were. I think that one of my 5335A's may have the -0999 in it. It's too much trouble to check. I hate messing withn those dip header jumpers.A picture of the 1DV8-0001 would be interesting.Oh, the picture of the -0999 you posted looks like Ray Charles might have soldered it in.thanks again,WoD

author: Uunoctium
author_rank: Frequent Contributor
timestamp: June 05, 2022, 05:58:55 pm
content: tl;dr...poster, released during German PR-campaignon the merits of German hand craft skills

author: Wrenches of Death
author_rank: Regular Contributor
timestamp: June 05, 2022, 06:14:42 pm
content: Quote from: Uunoctium on June 05, 2022, 05:58:55 pmJust seeing that picture makes me cringe.thanks!WoD