Author Topic: Can anyone identify the manufacurer.  (Read 1008 times)

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Offline innkeeperTopic starter

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Can anyone identify the manufacurer.
« on: August 17, 2022, 08:56:48 pm »
I bought some supposed Fairchild parts off amazon that I suspect are Chinese off-brand parts.
can anyone identify the manufacturer?
pic below
Hobbyist and a retired engineer and possibly a test equipment addict, though, searching for the equipment to test for that.
 

Offline HwAoRrDk

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Re: Can anyone identify the manufacurer.
« Reply #1 on: August 18, 2022, 10:23:16 am »
Hmm, well, the markings do correspond with what is expected according to the latest On Semi datasheet (Fairchild now being part of them), the "WK52" being factory, wafer, and week number. But, the lines are in the wrong order - it supposedly should be "BS170" on the first line. Older Fairchild datasheet doesn't give any info on package markings, unfortunately.

I'd have a search on LCSC and compare pictures. That'll probably tell you if they're actually a different brand.
 
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Online Messtechniker

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Re: Can anyone identify the manufacurer.
« Reply #2 on: August 18, 2022, 12:51:56 pm »
My collection of BS170 yields two types

Marking BS170 is older than the Siliconix  types.
All bought well before any chinesium types appeared.

Agilent 34465A, Siglent SDG 2042X, Hameg HMO1022, R&S HMC 8043, Peaktech 2025A, Voltcraft VC 940, M-Audio Audiophile 192, R&S Psophometer UPGR, 3 Transistor Testers, DL4JAL Transistor Curve Tracer, UT622E LCR meter, UT216C AC/DC Clamp Meter
 

Offline david77

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Re: Can anyone identify the manufacurer.
« Reply #3 on: August 18, 2022, 12:56:05 pm »
I look at the font BS170 is printed in and wanna say Philips. But then again the markings are not straight that makes me wanna say Chinesium? I don't know.
 

Offline HwAoRrDk

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Re: Can anyone identify the manufacurer.
« Reply #4 on: August 18, 2022, 02:54:12 pm »
Actually, on further investigation, it is probably not a Fairchild BS170. From photos I've found searching on Google, Fairchild ones should have 'F' logo on them, and definitely the manufacturing code and part number the other way around, exactly as per datasheet.
 

Offline innkeeperTopic starter

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Re: Can anyone identify the manufacurer.
« Reply #5 on: August 18, 2022, 03:19:19 pm »
Hmm, well, the markings do correspond with what is expected according to the latest On Semi datasheet (Fairchild now being part of them), the "WK52" being factory, wafer, and week number. But, the lines are in the wrong order - it supposedly should be "BS170" on the first line. Older Fairchild datasheet doesn't give any info on package markings, unfortunately.

I'd have a search on LCSC and compare pictures. That'll probably tell you if they're actually a different brand.

ah LCSC its worth a look for sure...
update: no luck on finding it on LCSC

also, i saw the same thing today on the datasheet with the part number in the top row....  I've never seen one like that yet in the wild and somthing to keep an eye out for..., that sheet also doesn't show a logo.
 
a current example from LCSC of the onesmi part and all I've ever seen them looking like.

« Last Edit: August 18, 2022, 03:28:46 pm by innkeeper »
Hobbyist and a retired engineer and possibly a test equipment addict, though, searching for the equipment to test for that.
 

Offline innkeeperTopic starter

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Re: Can anyone identify the manufacurer.
« Reply #6 on: August 18, 2022, 03:20:27 pm »
Actually, on further investigation, it is probably not a Fairchild BS170. From photos I've found searching on Google, Fairchild ones should have 'F' logo on them, and definitely the manufacturing code and part number the other way around, exactly as per datasheet.
Thats my thinking, i am curious who makes it though.
Hobbyist and a retired engineer and possibly a test equipment addict, though, searching for the equipment to test for that.
 


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