That die looks too small to be a 2N3055 with 15A collector current rating.
True enough. 200ma is just nutz. It would be interesting to try that for real on a high supply.
Absolutely no doubt, they are leaking like a sieve. Those are faulty beyond belief for supposed new parts. Fakes, damaged, rejects...... they need to go back for replacement.
They are certainly a lot smaller than genuine 2N3055s that I have opened in the past, perhaps 1/4 the area.
I'll not use any of those(all six tr) & going to place a new order at RS comp. Preferably to-3p package. Anyway thnks to everyone.
Regards
Regards
You're absolutely right. Despite this they're still selling that part. Really stinks!! I'm not going buy anything from that vendor in future.
BOTH are fake.
The left one is identical (so probably same "OEM" maker/faker as that sold as "Toshiba" .
The red labelled "Toshiba" in general are "good fakes", they stand even more voltage than genuine ST 2N3055, anything from 80V to incredible 114V, what makes me think they are relabelled TV vertical transistors or similar, they also have the small but barely adequate "8" shaped copper heat spreader.
When nothing better is available, I use those to repair my own old Guitar amplifiers (I have delivered over 14000 of them and keep them running forever, if Customer wants to) so I still need a stable supply of metallic TO3 2N3055 or equivalent.
Now the one on the right isn gross: small die but much worse, NO heat spreader .... a suicide waiting to happen.
Even IF they met Electrical specs, they will never survive, except, say, a Home use 30-40 W per channel amp which is putting out average 5W RMS or so.
Another telltale sign is that some of the worst fakes use a VERY thick base, think 2mm or so, in a futile attempt to dissipate a little more.
And quite likely made by CDIL, or another source, branded as ST, legally done of course.
Usha Rectifier used to supply to Mitsui and Marconi, among others, for defense quality parts, so getting parts made to specification is not something new.
Usha Rectifier used to supply to Mitsui and Marconi, among others, for defense quality parts, so getting parts made to specification is not something new.
In near future i'm going to visit kolkata for some high power to3. Once(2yrs ago) i asked about the price of 3055, if i can recall correctly the price was about 60 INR(Less than $1).
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I just checked here:
BEL, 17- 18 Rupees, Duplicate, original not available.
ST, 40 Rupees.
CDIL, 35 Rupees.
Shop is third generation in this business, trustworthy.
BEL, 17- 18 Rupees, Duplicate, original not available.
ST, 40 Rupees.
CDIL, 35 Rupees.
Shop is third generation in this business, trustworthy.
Please post USD (or Euro or GBP) price along with InR , otherwise it´s useless for comparison.
Those are not local farm products but International technological products intended for an International market.
I am talking ST, ON, Fairchild, etc, and BEL, CDIL, etc. are being compared to them, so ....
Those are not local farm products but International technological products intended for an International market.
I am talking ST, ON, Fairchild, etc, and BEL, CDIL, etc. are being compared to them, so ....
@JMFahey Please see the post #74. Two or three yrs ago locally the price was about $0.9 USD, genuine 2n3055 obviously. Probably CDIL made. The price is now $1.51USD at TME.
EDIT-Indian tech(quality etc) is very good, definitely comparable but in semiconductor business we are still taking baby steps. In production we are nothing in front of S.Korea, forget about Taiwan.
EDIT-Indian tech(quality etc) is very good, definitely comparable but in semiconductor business we are still taking baby steps. In production we are nothing in front of S.Korea, forget about Taiwan.
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