![]() ![]() Renesas Technology Corporation assumes no responsibility for any damage, or infringement of any third-party's rights, originating in the use of any product data, diagrams, charts, programs, algorithms, or circuit application examples contained in these materials. These materials are intended as a reference to assist our customers in the selection of the Renesas Technology Corporation product best suited to the customer's application they do not convey any license under any intellectual property rights, or any other rights, belonging to Renesas Technology Corporation or a third party. Remember to give due consideration to safety when making your circuit designs, with appropriate measures such as (i) placement of substitutive, auxiliary circuits, (ii) use of nonflammable material or (iii) prevention against any malfunction or mishap. Trouble with semiconductors may lead to personal injury, fire or property damage. Renesas Technology Corporation puts the maximum effort into making semiconductor products better and more reliable, but there is always the possibility that trouble may occur with them. Keep safety first in your circuit designs! 1. Except for our corporate trademark, logo and corporate statement, no changes whatsoever have been made to the contents of the document, and these changes do not constitute any alteration to the contents of the document itself. These operations include microcomputer, logic, analog and discrete devices, and memory chips other than DRAMs (flash memory, SRAMs etc.) Accordingly, although Hitachi, Ltd., Hitachi Semiconductors, and other Hitachi brand names are mentioned in the document, these names have in fact all been changed to Renesas Technology Corp. The semiconductor operations of Mitsubishi Electric and Hitachi were transferred to Renesas Technology Corporation on April 1st 2003. Just make sure the parts in one channel are the same, matching would be nice.Regarding the change of names mentioned in the document, such as Hitachi Electric and Hitachi XX, to Renesas Technology Corp. All the output transistors should be the same in each channel, differences between channels are okay. There are also 470 ohm and 390 ohm parts that warrant inspection, and don't forget the four diodes (H715 ~ H718). Also, inspect (measure!!) the 0.24 ohm resistors, a replacement would be 0.22 ohm, also 10 ohm and 220 ohm resistors in the driver / output circuit. Normally this means shorted output transistors and possibly drivers as well. I think the Toshiba site is better for looking up transistors they produced, Sanyo also has a search-able site. This is from a second source manufacturer, try to buy from the real manufacturer when you do buy. Look at this link to data sheets for 2SC945 to see what I mean. This does depend on the gain range denoted by the letter following the device type (not an A, B or C), they are commonly types R, O, Y, P and L. Looks like a winner, how about 2SC945? 50 VDC, 150 mA, 250 mW and gain from 40 to 700. I call them "the book of lies" and for good reason too. Remember, you are not allowed to use the ECG or NTE parts, nor are you allowed to use either replacement "manual". Now you only need to select a replacement with the same pinout and similar ratings. The following ratings are absolute maximum values except for gain and things like that, those will be typical values.Ģ5 VDC C-E, 200mW (at 25° ambient), collector current is 100 mA maximum and a beta of approx. Just making sure we are talking about the correct parts here.Ī quick look with Google presents the following data for the 2SC371. Those are for H705 and H706? The complimentary parts are H707 and H708 (2SA562Y) and these are the current limiting transistors - right? of course the more expensive the part, the more they can charge the customer for the repair. I used to use 2SD870 in video monitor service - $4.10 at MCM and the NTE89 sub for it is $8.45. In that MCM catalog, the 2SC1328 was 9 cents, while the NTE199 was $1.06. The amp certainly won't meet its power specs or reliability.Īnd the NTE stuff costs more. That NTE power xstr won't match up to anything. ![]() If one xstr turns on a bit lower than the others it hogs current, and conversely if one turns on a bit higher, the others do its work. When I have a row of six power xstrs in an output stage, I need them to share current. I work in pro audio, and this is especially important in high power amps. They make - or at least supply - a number of transistors, and they list the ones that most closely resemble your parts among those they make. Don't labor under the misconception that the NTE stuff is some sort of exact replacement - it's not. ![]()
0 Comments
Leave a Reply. |