To add to what Welcome said, if any company is selling these and they aren't on SanKen's official authorized distributor's list, they very likely to be fake.
Two TO3P Sanken LAPTs and kluge in the extra emitter resistor - if the equipment is yours. If you are a trusted repair shop you either already have a stash, or you just don't touch it.
Will compare them to the originals, should have some dead ones somewhere. If the die size is at least 5x5mm it should be decent value for money. Most of the ones i bought on eBay for laughs (Got refunded every time) had aprox 1.5X1.5mm those shorted out or went open at between 700mA and 1.5A.
Today I received the Inchange parts,
I only had Older Sanken MT-200 from the 90'S to compare. these are not the same part numbers.
The weight of the ISC is 13 grams instead of the 18.5 of a sanken.
The die Size is about 5x5mm versus 6x6mm for an original Sanken device, this is not too bad considering other devices like the Onsemi 2N3773 also have a 5x5 die.
The ISC lacks the TO3P heat spreader. The point of the extra TO3P heat spreader is to have a buffer against short therm overloads, by increasing the mass of the device. this is lacking in the Chinese device, giving the Sankens a definite edge in durability. also the metal is somewhat thinner, perhaps .25mm.
Funnily enough, the metal is the same thickness and dimensions as some of the fakes sold on eBay, perhaps this indicates a common part supplier.
Furthermore the bonding wire seems to be rather thin.
I wouldn't touch them for amplifier use. Perhaps in regulated power supplies that are crowbar protected... these parts were 40% of the cost, but the cost of the output transistors is dwarfed by everything else in the system.
All in all, seem to be decent ish transistors, the Die size seems to be correct, or in the ballpark (I cannot speak to current generation Sanken devices, im assuming these are unchanged)
I only had Older Sanken MT-200 from the 90'S to compare. these are not the same part numbers.
The weight of the ISC is 13 grams instead of the 18.5 of a sanken.
The die Size is about 5x5mm versus 6x6mm for an original Sanken device, this is not too bad considering other devices like the Onsemi 2N3773 also have a 5x5 die.
The ISC lacks the TO3P heat spreader. The point of the extra TO3P heat spreader is to have a buffer against short therm overloads, by increasing the mass of the device. this is lacking in the Chinese device, giving the Sankens a definite edge in durability. also the metal is somewhat thinner, perhaps .25mm.
Funnily enough, the metal is the same thickness and dimensions as some of the fakes sold on eBay, perhaps this indicates a common part supplier.
Furthermore the bonding wire seems to be rather thin.I wouldn't touch them for amplifier use. Perhaps in regulated power supplies that are crowbar protected... these parts were 40% of the cost, but the cost of the output transistors is dwarfed by everything else in the system.
All in all, seem to be decent ish transistors, the Die size seems to be correct, or in the ballpark (I cannot speak to current generation Sanken devices, im assuming these are unchanged)
Attachments
That ISC die layout looks like the MJ15024 family. If it is similar (or maybe it is), the SOA may be somewhat reasonable. I doubt it has the pretty beta curves and fT of the original Sanken. So the outputs may not blow, but you could over stress the drivers if your design was counting on having hFE of 80 at 10 amps.... and somewhat higher distortion.
profusion a1295 & c3264
No wonder I got the last 6 they had in stock, you had most of them! Profusion only had a1295-O & c3264-O. I believe these are selected as lower gain version than the 1295-Y & 3264-Y (according to Sanken data hFE Rank O(50to100), Y(70to140)). I am in the process of fixing a Malcolm Hill designed Chameleon power amp which has 1 pair blown of the Y variety (higher gain. I don't think -O variant is OK to parallel with -Y type. My existing good transistors have hFE of approx 140, high up in the Y gain spec.) it has 5 NPN and 5 PNP per channel in parallel for a rated 700W per channel into 4ohm.I'm glad I picked up a couple not to long ago and almost cleaned out Profusion.
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I ordered 50 each A1295 and C3264 from Newark in February but didn't receive all the C3264's. I just got a notice that the rest of my order shipped - I had completely forgotten about it. Both types are in stock at Newark/element14 now. Their description gave hFE as 50 but I received all Y-grade. Looks like there are 438 C3264's in stock and 266 of A1295.
Phil
Phil
Guys, I am getting regurarley MT200's of that fellow
2SC2922 2SA1216 tranzystory audio SANKEN (7187466798) - Allegro.pl - Więcej niż aukcje.
Never have any problems. Recently have ordered 20 pairs.
Regards
2SC2922 2SA1216 tranzystory audio SANKEN (7187466798) - Allegro.pl - Więcej niż aukcje.
Never have any problems. Recently have ordered 20 pairs.
Regards
Hi Peter,do you trast this seller?
I see very low prices 2sj74,2sk170 in the list.
Hi Toni, what about this test?
I have a lot of those from a donation.
I haven't the way to test myself.
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