Sorry if this has already been covered, but I'm a dumb newbie.
After reading Douglas Self's comments in "Audio Power Amplifier Design" (p. 310) about his use of Allegro-Sanken power transistors 2SC3264 and 2SA1295, I ordered some from a reputable dealer (Newark Element 14) and an Ebay seller (turned out to be fakes at 2/3 the price). These devices are now discontinued.
I contacted Sanken sales to find out the reason for the discontinuation, and for their recommendation for replacements. They had no suggestions for either.
These devices were manufactured by Sanken in Japan. Because some data sheets label them "Allegro-Sanken" I thought that they might have been made by the now-closed fab of Sanken-owned Allegro Microsystems, LLC in Worcester, Massachusetts, or by Sanken-owned Polar Semiconductor in Minnesota, with a chance that they might be revived. No such luck.
Self commented that these "modern power transistors" have little beta-droop. Bob Cordell's website lists some big power devices, such as MJL3281. The 2SC3264 comes in an MT-200 package, the MJL3281 in a TO-264 package, both with the same maximum power dissipation ratings. The data sheets show the MJL3281 as having slightly better beta characteristics, but somewhat lower Ft than the 2SC3264.
Does anyone have experience with fake 2SC3264 versus genuine ones? How about fake semiconductor devices versus genuine ones in general?
Does anyone have experience with the MJL3281 devices versus the 2SC3264 devices?
Cordell provides a model for the MJL3281, but I have been unable to find a model for the 2SC3264. Do any exist?
I'm designing a 100W amplifier, mostly as a design exercise. Would using one or the other of the above device families make much of a difference in the amplifier characteristics?
After reading Douglas Self's comments in "Audio Power Amplifier Design" (p. 310) about his use of Allegro-Sanken power transistors 2SC3264 and 2SA1295, I ordered some from a reputable dealer (Newark Element 14) and an Ebay seller (turned out to be fakes at 2/3 the price). These devices are now discontinued.
I contacted Sanken sales to find out the reason for the discontinuation, and for their recommendation for replacements. They had no suggestions for either.
These devices were manufactured by Sanken in Japan. Because some data sheets label them "Allegro-Sanken" I thought that they might have been made by the now-closed fab of Sanken-owned Allegro Microsystems, LLC in Worcester, Massachusetts, or by Sanken-owned Polar Semiconductor in Minnesota, with a chance that they might be revived. No such luck.
Self commented that these "modern power transistors" have little beta-droop. Bob Cordell's website lists some big power devices, such as MJL3281. The 2SC3264 comes in an MT-200 package, the MJL3281 in a TO-264 package, both with the same maximum power dissipation ratings. The data sheets show the MJL3281 as having slightly better beta characteristics, but somewhat lower Ft than the 2SC3264.
Does anyone have experience with fake 2SC3264 versus genuine ones? How about fake semiconductor devices versus genuine ones in general?
Does anyone have experience with the MJL3281 devices versus the 2SC3264 devices?
Cordell provides a model for the MJL3281, but I have been unable to find a model for the 2SC3264. Do any exist?
I'm designing a 100W amplifier, mostly as a design exercise. Would using one or the other of the above device families make much of a difference in the amplifier characteristics?
In general 3264 combo will sound far smother and sweet
Those have been compared extensively versus many parameters at the same or other bias and a million other variables on my P3A adventure ....3264 wins all the time
Similar and while 1302-3281 is more or less the same with 1943-5200 the Toshiba combo wins by far all the time and at any condition.
FAkes ? sorry i cannot help you
regards
Sakis
Those have been compared extensively versus many parameters at the same or other bias and a million other variables on my P3A adventure ....3264 wins all the time
Similar and while 1302-3281 is more or less the same with 1943-5200 the Toshiba combo wins by far all the time and at any condition.
FAkes ? sorry i cannot help you
regards
Sakis
There’s no substitute for SanKen goodness....
My big rigs use the 1295/3264 power stages
Technics SE-A3MK2/ RAMSA WP-9440
My big rigs use the 1295/3264 power stages
Technics SE-A3MK2/ RAMSA WP-9440
I suppose it would be easy enough to make provisions on the PCB for various types to try them out.
I obtained Toshiba's datasheets and PSpice models for the 1943-5200s, commented out the .SUBCKT lines, and substituted them for the 1302-3281s in my LTspice simulation. The 20KHz distortion doubled. So more investigation is warranted. Perhaps the drivers should be changed. I've got ksa1220 and ksc2690 at the moment.
Low level distortion changes with poorly characterized SPICE models is absolutely no surprise. And, to be honest, publicly available SPICE models that aren't lovingly made from the community are good for setting up biases/setpoints and gross distortion, but not much past that.
Double check the biases are still in a good range for the transistors (SPICE) first, but accept that you'll have to measure two working models to elucidate the difference.
Double check the biases are still in a good range for the transistors (SPICE) first, but accept that you'll have to measure two working models to elucidate the difference.
Although not a real replacement for the 2SC3264/2SA1295 MT200-cased transistors, Allegro/Sanken is apparently still making the "little brother" to them in an MT100 (TO-3P), 2SC3263/2SA1294. Looking at the spec sheets, it wouldn't surprise me if these use the same die as the larger MT200 brothers.
The 2SC3263 is only good for 15A instead of 17A, 130W instead of 200W, and the SOA is only about 75% as good as the bigger brother. However, they are close to half the price of the MT200s. I have a handful of these I'm going to try in my Honey Badger build.
The 2SC3263 is only good for 15A instead of 17A, 130W instead of 200W, and the SOA is only about 75% as good as the bigger brother. However, they are close to half the price of the MT200s. I have a handful of these I'm going to try in my Honey Badger build.
Profusion still have more than 1k of 2SC3264 in stock. For driver, try 2SC4883/2SA1859 from Digikey, of TTC/TTA004 from Mouser!
I use 2SC3519/2SA1386 as output device they are the MT100 equivalent of the 2SC2922/2SA1216.
Sajti
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