Electronics > Repair
Need help deciphering inductor label on laptop schematic to find replacement.
(1/4) > >>
JeffBloomgold:
Hello!

I'm attempting to repair a fault in a Dell Inspiron 5770 motherboard which prevents the battery from charging or the laptop from running off of battery. I've found a very obviously blown inductor and found a schematic to see what I need to get to replace it with. However I have a few questions on how to decipher its label in the schematic (see attached image of the battery circuit schematic - it's PL4 in that image.)

It's labeled as "5A Z150 20M 1210_2P"

5A is 5 amps and I assume it's the rated current but didn't know if it might be the current saturation.

Z150 is something I have no idea about. I found one seller of SMD inductors that has this Z150 as part of its model number/marking and assume that's probably all it is, but was hoping to get some clarification.

20M: Not sure if this is 20% tolerance or if it's an inductance value of 2.0uH? If it's the latter, what is the M for. If it's the former, what is the inductance value?

1210: type of case

2P: No idea what this means

Also after a bit more reading, it looks like Z150 might be in reference to impedance and 20M in reference to frequency? Is there some way to tell what kind of replacement I need to get if so?

Thanks all!
fzabkar:

--- Quote ---see attached image of the battery circuit schematic
--- End quote ---

I don't see it.
JeffBloomgold:
Hmmm looks like I goofed and forgot to attach it. Here it is. I also attached an pic of the motherboard/inductor itself.

Edit: Also, is this actually a ferrite bead?
helius:
2P means it is a "2 pin" device with two terminals. Many EMI suppressing "inductors" are actually chokes with 4 pins.
Ferrite beads are one kind of inductor. The other type is made of wire wound around a bobbin inside a piece of iron or ferrite.

5 A current is quite high for a 1210 case device, it may be difficult to match that.

Look at the Würth Elektronik 742792312: 1210 case, 0.03 ohms at DC, 110 ohms at 1000 MHz, 65 ohms at 100 MHz. 3000 mA DC current.
JeffBloomgold:
I also found this one Helius:

https://www.mouser.com/ProductDetail/Fair-Rite/2512061217Y5?qs=paL1wOLBYNdLzI%2FVPVZ0Rg%3D%3D

Package / Case:    1206 (3216 metric)    
Impedance:    120 Ohms    
Maximum DC Current:    5 A    
Tolerance:    25 %    
Maximum DC Resistance:    20 mOhms

I figure the size of the case is close enough to work but I wasn't sure how close to the original values I need to get in order for it to work well. I'm a bit of a newb if you couldn't tell ;D
Navigation
Message Index
Next page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod