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| Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Identify transistor H669A
Hi,
can anyone identify this transistor? Marked H 669A Its in a To 126 size all plastic package but a fair bit thicker, one I have not seen before. (why?) Its an NPN with lead out BCE. Its directly on the heatsink of a power amp in series with a thermistor, so is either part of the bias circuitry or temperature sense. I don't have a schematic. Cheers, Gareth. |
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#2
Posted to sci.electronics.repair
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Identify transistor H669A
Gareth Magennis wrote in message
... Hi, can anyone identify this transistor? Marked H 669A Its in a To 126 size all plastic package but a fair bit thicker, one I have not seen before. (why?) Its an NPN with lead out BCE. Its directly on the heatsink of a power amp in series with a thermistor, so is either part of the bias circuitry or temperature sense. I don't have a schematic. Cheers, Gareth. 180 volt 2SD669A with reversed pinning ? NPN and TO126 but ECB -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
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#3
Posted to sci.electronics.repair
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Identify transistor H669A
"N_Cook" wrote in message ... Gareth Magennis wrote in message ... Hi, can anyone identify this transistor? Marked H 669A Its in a To 126 size all plastic package but a fair bit thicker, one I have not seen before. (why?) Its an NPN with lead out BCE. Its directly on the heatsink of a power amp in series with a thermistor, so is either part of the bias circuitry or temperature sense. I don't have a schematic. Cheers, Gareth. 180 volt 2SD669A with reversed pinning ? NPN and TO126 but ECB Ah, just realised that the legend is actually on the back of the device - it was mounted legend side to the heatsink, and on closer inspection the pins are closest to the legend side, so it looks like you might well be correct. It is a peculiar package, one I haven't seen before. (This is from a cheap Chinese no name power amplifier, so maybe this is a Chinese part?). Thanks, Gareth. |
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#4
Posted to sci.electronics.repair
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Identify transistor H669A
Gareth Magennis wrote:
Hi, can anyone identify this transistor? Marked H 669A Its in a To 126 size all plastic package but a fair bit thicker, one I have not seen before. (why?) Its an NPN with lead out BCE. Its directly on the heatsink of a power amp in series with a thermistor, so is either part of the bias circuitry or temperature sense. I don't have a schematic. Cheers, Gareth. 2SD669A? |
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#5
Posted to sci.electronics.repair
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Identify transistor H669A
Gareth Magennis wrote:
Hi, can anyone identify this transistor? Marked H 669A Its in a To 126 size all plastic package but a fair bit thicker, one I have not seen before. (why?) Its an NPN with lead out BCE. Its directly on the heatsink of a power amp in series with a thermistor, so is either part of the bias circuitry or temperature sense. I don't have a schematic. Cheers, Gareth. http://www.datasheetcatalog.com/data.../2SD669A.shtml |
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#6
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Identify transistor H669A
On Mon, 3 Nov 2008 12:45:53 -0000, "Gareth Magennis"
put finger to keyboard and composed: can anyone identify this transistor? Marked H 669A http://www.dayan.com.cn/Datasheet/Hu...o126/H669A.pdf - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
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#7
Posted to sci.electronics.repair
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Identify transistor H669A
Gareth Magennis wrote:
"N_Cook" wrote in message ... Gareth Magennis wrote in message ... Hi, can anyone identify this transistor? Marked H 669A Its in a To 126 size all plastic package but a fair bit thicker, one I have not seen before. (why?) Its an NPN with lead out BCE. Its directly on the heatsink of a power amp in series with a thermistor, so is either part of the bias circuitry or temperature sense. I don't have a schematic. Cheers, Gareth. 180 volt 2SD669A with reversed pinning ? NPN and TO126 but ECB Ah, just realised that the legend is actually on the back of the device - it was mounted legend side to the heatsink, and on closer inspection the pins are closest to the legend side, so it looks like you might well be correct. It is a peculiar package, one I haven't seen before. (This is from a cheap Chinese no name power amplifier, so maybe this is a Chinese part?). Thanks, Gareth. I think you will find Hitachi are Japanese. |
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#8
Posted to sci.electronics.repair
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Identify transistor H669A
"Franc Zabkar" wrote in message ... On Mon, 3 Nov 2008 12:45:53 -0000, "Gareth Magennis" put finger to keyboard and composed: can anyone identify this transistor? Marked H 669A http://www.dayan.com.cn/Datasheet/Hu...o126/H669A.pdf - Franc Zabkar -- Frank, that is the one. Thanks, Gareth. |
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#9
Posted to sci.electronics.repair
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Identify transistor H669A
"Archon" wrote in message . .. Gareth Magennis wrote: "N_Cook" wrote in message ... Gareth Magennis wrote in message ... Hi, can anyone identify this transistor? Marked H 669A Its in a To 126 size all plastic package but a fair bit thicker, one I have not seen before. (why?) Its an NPN with lead out BCE. Its directly on the heatsink of a power amp in series with a thermistor, so is either part of the bias circuitry or temperature sense. I don't have a schematic. Cheers, Gareth. 180 volt 2SD669A with reversed pinning ? NPN and TO126 but ECB Ah, just realised that the legend is actually on the back of the device - it was mounted legend side to the heatsink, and on closer inspection the pins are closest to the legend side, so it looks like you might well be correct. It is a peculiar package, one I haven't seen before. (This is from a cheap Chinese no name power amplifier, so maybe this is a Chinese part?). Thanks, Gareth. I think you will find Hitachi are Japanese. Frank gets first prize, its a Chinese 2SD669A  Gareth. |
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#10
Posted to sci.electronics.repair
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Identify transistor H669A
Gareth Magennis wrote:
"Archon" wrote in message . .. Gareth Magennis wrote: "N_Cook" wrote in message ... Gareth Magennis wrote in message ... Hi, can anyone identify this transistor? Marked H 669A Its in a To 126 size all plastic package but a fair bit thicker, one I have not seen before. (why?) Its an NPN with lead out BCE. Its directly on the heatsink of a power amp in series with a thermistor, so is either part of the bias circuitry or temperature sense. I don't have a schematic. Cheers, Gareth. 180 volt 2SD669A with reversed pinning ? NPN and TO126 but ECB Ah, just realised that the legend is actually on the back of the device - it was mounted legend side to the heatsink, and on closer inspection the pins are closest to the legend side, so it looks like you might well be correct. It is a peculiar package, one I haven't seen before. (This is from a cheap Chinese no name power amplifier, so maybe this is a Chinese part?). Thanks, Gareth. I think you will find Hitachi are Japanese. Frank gets first prize, its a Chinese 2SD669A Gareth. Let me know when you source a Chinese one that works then, I'll stick with Hitachi thanks. Surprised they even bothered to put numbers on it. |
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