Author Topic: Identify this part please  (Read 1197 times)

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Offline tahpTopic starter

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Identify this part please
« on: August 19, 2022, 02:37:25 am »
Hello folks, I'm having a hard time sourcing what looks like a resistor. Hopefully anyone here knows.
 

Offline ataradov

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Re: Identify this part please
« Reply #1 on: August 19, 2022, 02:46:07 am »
This is a 5 MOhm resistor.

Just plug "5M0 resistor" into google and you will get a ton of results.

The soldered resistor is 50 mOhm and they seem to be in parallel. This makes no sense.
« Last Edit: August 19, 2022, 02:48:52 am by ataradov »
Alex
 

Offline srb1954

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Re: Identify this part please
« Reply #2 on: August 19, 2022, 02:52:52 am »
The soldering on the R005 resistor below doesn't look too great. I would touch up the soldering on that resistor as it looks to be a current sense resistor and probably carries a reasonable current.
 

Offline gamalot

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Re: Identify this part please
« Reply #3 on: August 19, 2022, 03:02:15 am »
It's a 0.005 ohm resistor.

Offline gamalot

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Re: Identify this part please
« Reply #4 on: August 19, 2022, 03:05:01 am »
This is a 5 MOhm resistor.

Just plug "5M0 resistor" into google and you will get a ton of results.

The soldered resistor is 50 mOhm and they seem to be in parallel. This makes no sense.

I think R93/R94 are all 5 milliohm resistors.

Offline ataradov

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Re: Identify this part please
« Reply #5 on: August 19, 2022, 03:16:51 am »
I think R93/R94 are all 5 milliohm resistors.
Logically it makes sense. But that would be the first time I see 5M0 used for 5 mOhm.

And yes R005 is 5 mOhm, not 50.

Also, the second one is clearly replaced. Those may be discharge resistors and the other one was also 5 Meg and got swapped with a complete opposite.
« Last Edit: August 19, 2022, 03:33:32 am by ataradov »
Alex
 

Offline gamalot

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Re: Identify this part please
« Reply #6 on: August 19, 2022, 03:43:25 am »
I think R93/R94 are all 5 milliohm resistors.
Logically it makes sense. But that would be the first time I see 5M0 used for 5 mOhm.

And yes R005 is 5 mOhm, not 50.

Also, the second one is clearly replaced. Those may be discharge resistors and the other one was also 5 Meg and got swapped with a complete opposite.

Yes, sometimes this is really confusing.

I think 5 megohm chip resistors should be marked 505 or 5004 (actually 5 megohms are rare, even much rarer than 4.99 or 5.11 megohms, and 5 milliohms shunt is common).

When people ask for help identifying components, it's a good idea to upload both a picture with details and a picture that shows the surrounding circuitry.
« Last Edit: August 19, 2022, 03:45:05 am by gamalot »
 

Offline ataradov

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Re: Identify this part please
« Reply #7 on: August 19, 2022, 04:21:11 am »
I looked at the high value resistors I have. Yageo are marked as 475 for 4.7 MOhm.

And it looks like Panasonic marks their 5 mOhm resistors "5M0". So yes, this is 5 mOhm for sure. Here it is https://www.digikey.com/en/products/detail/panasonic-electronic-components/ERJ-M1WSF5M0U/300452
Alex
 

Offline tahpTopic starter

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Re: Identify this part please
« Reply #8 on: August 19, 2022, 04:38:58 am »
Awesome guys,  and for thr folks wondering. There's supposed to be another  5mo where the other resistor is sketchelly soldered. I'm trying to figure it out and make the best out of a Craigslist scam
 

Offline ataradov

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Re: Identify this part please
« Reply #9 on: August 19, 2022, 04:44:29 am »
The resistors are matching, they are just from different manufacturers.

The second one is pretty poorly soldered. They probably struggled heating up that copper plane. I would reflow it for sure.
Alex
 


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