Mystery surface mount - passive?

Thread Starter

Rip Lavabit

Joined Apr 17, 2017
3
I was hoping I might find some help identifying a surface mount component - each is green and shiny and vary by the size and shape of the cutout space, some have a small notch cut out of the green area, others are solid green. Pictured with 0.6mm solder for scale. (larger image attached)

Thank you!

20170417_162223.jpg
 

Thread Starter

Rip Lavabit

Joined Apr 17, 2017
3
Huh - darn, still cant seem to locate a manufacturer with a part that resembles these even searching for precision resistors.

Probably a precision trimmed resistor - just a guess, given the poor quality of your photo.
If there's a specific detail you're looking for I can try to take another photo (you did click the thumbnail for the full-size right?). There are 2 1/2 well-focused examples in the image, and you can tell by the 0.6mm solder that they're about 1.2 mm wide...doesn't exactly follow the rule of thirds for good composure but I wouldn't think there's more to be gleaned from a slightly larger photo or a little more magnification. Im a little handicapped without access to a digital scope. The best I can do is try to get my camera phone in the sweet spot of the eyepiece.
 

SLK001

Joined Nov 29, 2011
1,549
If there's a specific detail you're looking for I can try to take another photo (you did click the thumbnail for the full-size right?). There are 2 1/2 well-focused examples in the image, and you can tell by the 0.6mm solder that they're about 1.2 mm wide...doesn't exactly follow the rule of thirds for good composure but I wouldn't think there's more to be gleaned from a slightly larger photo or a little more magnification. Im a little handicapped without access to a digital scope. The best I can do is try to get my camera phone in the sweet spot of the eyepiece.
Well, the quality of the photo isn't terribly bad, but the composition of the photo was pretty bad. The photo has no context with the rest of the circuitry. The scale of the parts isn't discernable, since the piece of solder is mostly out-of-focus.

If you insert a photo, you have limited ability to zoom it. If you attach a photo, you can zoom to the original photo size.
 

ErnieM

Joined Apr 24, 2011
8,415
These appear to me to be clearly surface mount resistors trimmed as Robert suggested for high voltage isolation.
 

SLK001

Joined Nov 29, 2011
1,549
These appear to me to be clearly surface mount resistors trimmed as Robert suggested for high voltage isolation.
Who's Robert? And when did high voltage enter into this discussion? As I suggested, they are a precision, trimmed SMT resistors.
 

ErnieM

Joined Apr 24, 2011
8,415
Oops Robin... and high voltage isolation entered the discussion in post #3.

While you are correct these are trimmed devices Robin has pointed out the rational for that style of trim.
 

Thread Starter

Rip Lavabit

Joined Apr 17, 2017
3
Thanks for clarifying SLK. Sounds like there's some consensus already but context photos provided below. Original components boxed in red. You're looking at the better part of the circuitry for one channel of a 4 channel potentiostat used for electrochemistry (the circuit pictured in the second photo, minus the ICs along the right side, is duplicated for every channel).

20170419_082214.jpg 20170419_082316.jpg
 

Tonyr1084

Joined Sep 24, 2015
9,744
Years of experience with SMT Pick-N-Place machines, sometimes a resistor ends up mounted upside down, meaning the value is printed on the other side. It's clear this is a resistor because it has what appears to be three edges foiled on each end of the component. Capacitors have five sides foiled (the end, top, bottom and both sides (on each end)). Nobody here is going to be able to tell you the value of the component. At best, it's a resistor. That's as much information as you'll get without removing it from the circuit and either reading the value on the other side OR removing it and measuring it with a DVM.
 
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