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Just noticed this Robb.Two things I see wrong. First, do not confuse a 2SD1446 with an SD1446. They are completely different devices. The 2SD1446 is a Darlington pair in a TO-220 case with very high gain for power amplification........but not RF power amplification.......usually meant for switching. The SD1446 is a VHF RF power transistor in a 211-07 case like the MRF-455, but rated at 70 watts out but requires 7 watts of drive to achieve that. The Motorola MRF-455 is rated at 60 watts out but with only 3 watts of drive and is only rated to 30 MHz. making it an HF device. The MRF-455 and the SD1446 can hardly be thought of as " basically both the same transistor under different mfrs/numbers" just because they are both used in RF amps.

2SD1446 datasheet and application note, data sheet, circuit, pdf, cross reference | Datasheet Archive

http://www.datasheetcatalog.org/datasheet/stmicroelectronics/2805.pdf

http://www.macomtech.com/datasheets/mrf455.pdf

<blockquote data-quote="Captain Kilowatt" data-source="post: 377938" data-attributes="member: 39">Just noticed this Robb.Two things I see wrong. First, do not confuse a 2SD1446 with an SD1446. They are completely different devices. The 2SD1446 is a Darlington pair in a TO-220 case with very high gain for power amplification........but not RF power amplification.......usually meant for switching. The SD1446 is a VHF RF power transistor in a 211-07 case like the MRF-455, but rated at 70 watts out but requires 7 watts of drive to achieve that. The Motorola MRF-455 is rated at 60 watts out but with only 3 watts of drive and is only rated to 30 MHz. making it an HF device. The MRF-455 and the SD1446 can hardly be thought of as &quot; basically both the same transistor under different mfrs/numbers&quot; just because they are both used in RF amps.<a href="http://www.datasheetarchive.com/2SD1446-datasheet.html#" target="_blank">2SD1446 datasheet and application note, data sheet, circuit, pdf, cross reference | Datasheet Archive</a><a href="http://www.datasheetcatalog.org/datasheet/stmicroelectronics/2805.pdf" target="_blank">http://www.datasheetcatalog.org/datasheet/stmicroelectronics/2805.pdf</a><a href="http://www.macomtech.com/datasheets/mrf455.pdf" target="_blank">http://www.macomtech.com/datasheets/mrf455.pdf</a></blockquote>

[QUOTE="Captain Kilowatt, post: 377938, member: 39"] Just noticed this Robb.Two things I see wrong. First, do not confuse a 2SD1446 with an SD1446. They are completely different devices. The 2SD1446 is a Darlington pair in a TO-220 case with very high gain for power amplification........but not RF power amplification.......usually meant for switching. The SD1446 is a VHF RF power transistor in a 211-07 case like the MRF-455, but rated at 70 watts out but requires 7 watts of drive to achieve that. The Motorola MRF-455 is rated at 60 watts out but with only 3 watts of drive and is only rated to 30 MHz. making it an HF device. The MRF-455 and the SD1446 can hardly be thought of as " basically both the same transistor under different mfrs/numbers" just because they are both used in RF amps. [url=http://www.datasheetarchive.com/2SD1446-datasheet.html#]2SD1446 datasheet and application note, data sheet, circuit, pdf, cross reference | Datasheet Archive[/url] [URL]http://www.datasheetcatalog.org/datasheet/stmicroelectronics/2805.pdf[/URL] [URL]http://www.macomtech.com/datasheets/mrf455.pdf[/URL] [/QUOTE]

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