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I would say the A1837 could to be fake, the "A" and "8" should be intersected. However I'm not betting any money on it, they might have changed markings at some time. For a fake, the marking looks rather good otherwise, so unfortunately, you need to measure/test them to be sure.
Edit: Added reference
https://czh-labs.com/10pcs-2sa1837-a1837-original-toshiba-transistorpnp-p1192.html
(I don't know that site, but these seem to be genuine parts.)
Edit: Added reference
https://czh-labs.com/10pcs-2sa1837-a1837-original-toshiba-transistorpnp-p1192.html
(I don't know that site, but these seem to be genuine parts.)
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You might be right..... 2sa1837 does not look the same as 2sc4793..... seems like 2sc4793 is original but 2sa is not.... and it is different series numbers from pictures of series nu.bers i saw on one of major sales companies online where i got them
They are made 5 years apart, unfortunately the manufacturers consistency when marking components is not great, but the plastic moulding looks good to me and the boxes are the same, I think these are legit parts. I would scrutinize the plastic case carefully rather than the laser marking.
I'd give the parts a "thumbs up", now that I have seen the boxes. It really might have been a change in the production process. (Usually, semiconductor manufacturers nowadays oursource the housing, testing and marking to other, specialized, companies - at least that happened with our products. The packaging and the stickers are legit, very much like packaging we have with our Toshiba products.)
Thank you all for replies....
problem is, that first picture in my first post is what i received and parts on those pictures following are what seller claimed he will send..... seems to me those i got are not the same as those on the sellers website....
So, only the first picture in my first post is actually relevant i think because this is what i actually got.....
problem is, that first picture in my first post is what i received and parts on those pictures following are what seller claimed he will send..... seems to me those i got are not the same as those on the sellers website....
So, only the first picture in my first post is actually relevant i think because this is what i actually got.....
Yeh, these are the later types after Toshiba moved assembly to Malaysia from Japan. Not long after 2013 they stopped making these. They look genuine to me along with the packaging.
Anyone needed to source more of this type should look at the thread "New transistor source". A lot of old favs being made again.
Nikos - your do look genuine to me also....
Will take more detail pictures of the set i have...
Maybe Gary S can check them again and confirm.....
Give me a minute or two
Will take more detail pictures of the set i have...
Maybe Gary S can check them again and confirm.....
Give me a minute or two
The font of your 2SA1837 is different, but at the end of the day only measurements will show if they are genuine.
Number 3 is not round....
Letter A is not cut in the middle
Number 8 is not cut vertically in the middle and so on
...
Those i have look not.like genuine....
Unless that what Gary said is true and they signed them up differently in Malaysia...
Bit then, those on the pictures with packaging look differently from what i have....
Soo all this is very uncertain and i think i will go for TTA/TTC equivalent..
.. those are genuine for sure - that i am certain
Letter A is not cut in the middle
Number 8 is not cut vertically in the middle and so on
...
Those i have look not.like genuine....
Unless that what Gary said is true and they signed them up differently in Malaysia...
Bit then, those on the pictures with packaging look differently from what i have....
Soo all this is very uncertain and i think i will go for TTA/TTC equivalent..
.. those are genuine for sure - that i am certain
Exactly
.. but as said..... this all is not for.me a bullet proof thing..... so, i decided i will go for TTC/TTA REPLACEMENTS....
...
Those i got are genuine... only the pinout is reversed.... can't have it all 😁😁
THANK YOU ALL FOR EVERYTHING
I am not sure about these transistors, the 4793 ones look legit, but the print on the 1837 ones !?! Omg! NO GO.
Also the 1837/4793 are available from https://us.profusion.uk/int/?_gl=1*...T*MTczNDQ0MzQ1My4xMC4wLjE3MzQ0NDM0NTMuMC4wLjA. , now they carry 2 brands: KEC and UTC
That’s a great decision ,
Also the 1837/4793 are available from https://us.profusion.uk/int/?_gl=1*...T*MTczNDQ0MzQ1My4xMC4wLjE3MzQ0NDM0NTMuMC4wLjA. , now they carry 2 brands: KEC and UTC