SMD Resistors 1,52K 0603 - Page 1
Forum section: electronics / repair

author: German_EE
author_rank: Super Contributor
timestamp: September 30, 2014, 10:21:09 am
content: I am looking for some 1,52K 0603 sized resistors to do a repair but all of the normal distributors do not have stock. So far I have tried Digikey, Farnell, Mouser and RS Components. Can anyone assist in my search?I need ten resistors.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: September 30, 2014, 10:30:05 am
content: Quote from: German_EE on September 30, 2014, 10:21:09 amUse 2 higher values in parallel.

author: 4thDoctorWhoFan
author_rank: Regular Contributor
timestamp: September 30, 2014, 10:32:53 am
content: What tolerance do you need because I know Digikey stocks 1.5k or 1.54k 0603 resistors.

author: German_EE
author_rank: Super Contributor
timestamp: September 30, 2014, 11:06:38 am
content: Tolerance, as close as possible because in this application the designer has replaced adjustable potentiometers with select on test components. If I am very careful I can use a 1.54K and a 120K which gives in theory 1520.5 ohms but I will need a very steady hand and maybe a low power microscope.

author: SArepairman
author_rank: Frequent Contributor
timestamp: September 30, 2014, 08:59:32 pm
content: you can super glue them together first

author: Rufus
author_rank: Super Contributor
timestamp: September 30, 2014, 11:02:09 pm
content: Quote from: German_EE on September 30, 2014, 11:06:38 amManually tagging an SMD resistor on top of another one isn't any harder than soldering the first one on the board. Making a little pyramid putting two resistors in series - that's tricky.

author: nukie
author_rank: Frequent Contributor
timestamp: October 02, 2014, 04:40:38 am
content: Quote from: SArepairman on September 30, 2014, 08:59:32 pmSuperglue CA will withstand soldering temperature???

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: October 02, 2014, 08:58:44 am
content: Quote from: nukie on October 02, 2014, 04:40:38 amSoldering something that has superglue on it produces nasty fumes.Piggybacking chip components is no harder than hand-soldering them.

author: Kjelt
author_rank: Super Contributor
timestamp: October 02, 2014, 05:00:37 pm
content: Just checked my stock, I only have 7k68 ±0,1% 0603, if you solder 5 parallel you get 1k536, still not close enough probably? (+1%) and a stack of 5 resistors is a bit too much but can send them to you if you have no other alternatives.

author: con-f-use
author_rank: Unknown
timestamp: October 02, 2014, 06:37:27 pm
content: 2.21k + 4.87k parallel gives you an Error of about 0.01% plus the propagated resistor error, which is 0.14% for 0.1%-class resistors (E96) --> 1 Cent a piece @ mouser.1.54k + 117k is exact with 0.07% propagated error for 0.05%-class resistors (E192) -> 7 Cent a piece.

author: katzohki
author_rank: Frequent Contributor
timestamp: October 03, 2014, 02:31:21 pm
content: Using potentiometers is a terrible method of design because it leads to problems like this. If you help us understand the circuit maybe we can help you find a resistor value that would be suitable. Otherwise you will have to order from what they have as non-stock.http://www.digikey.com/product-search/en?pv1=1610&FV=fff40001%2Cfff800e9&k=resistor&mnonly=0&newproducts=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25

author: German_EE
author_rank: Super Contributor
timestamp: October 03, 2014, 05:27:30 pm
content: Thank you for all the replies, the item has now been repaired using two stacked 0603 resistors and a blob of silicon for mechanical stability.In case anyone was wondering what the item was, it's the engine management unit in a Jaguar XJS. I have been promised a test drive over the weekend

author: HighVoltage
author_rank: Super Contributor
timestamp: October 03, 2014, 06:07:53 pm
content: Quote from: German_EE on October 03, 2014, 05:27:30 pmI am surprised that one had SMD parts installed.The last Jaguar engine control unit that I opened up, was all in TH parts, but that was 15 years ago.Was this control unit made by Bosch or was it a UK based manufacturer?

author: German_EE
author_rank: Super Contributor
timestamp: October 04, 2014, 05:22:11 pm
content: This EMU was part of a third party 'enhancement' package that the owner purchased last year, I have no idea of the manufacturer because it was constructed inside a standard diecast box. What I CAN tell you is that it works very well, on the Autobahn this afternoon we managed 150 mph / 240 kph with the rev counter just touching the red zone.It was the sort of afternoon you only want to do once, just to say that you have done it.

author: Co6aka
author_rank: Unknown
timestamp: October 04, 2014, 05:43:06 pm
content: Quote from: German_EE on October 04, 2014, 05:22:11 pmGermans are so fortunate.On the autobahn here I typically manage no more than 15 mph, and 0 mph frequently.

author: HighVoltage
author_rank: Super Contributor
timestamp: October 04, 2014, 06:00:12 pm
content: OK, that makes sense then, that the car had a none OEM Engine Computer installed.Yes, we are lucky with our Autobahn in Germany. On some sections we can go as fast as we want.The only "problem" is, that most high end cars are limited to 250 km/h by the manufacturers.But the real speed is limited by the traffic on the Autobahn.

author: SeanB
author_rank: Super Contributor
timestamp: October 04, 2014, 06:17:58 pm
content: You can come here and do 120kph on our freeways ( potholes and stay out of Josi or it will hurt your credit card permitting) or if you find an area without potplants you might do more. Last month a few news items about guys being caught doing close to 300kph on a freeway. He must have forgotten to leave the plates off......