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Stylized S logo that I cannot find any information on. The model of this stud mount diode is 240E10RTC. It measures 45 mm in width has 20 mm threaded endS LOGO STUD MOUNT DIODE

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  • \$\begingroup\$ maybe you can take a guess at the country of manufacturing? \$\endgroup\$
    – Marcus Müller
    Commented Jan 1, 2022 at 17:47
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    \$\begingroup\$ top of my head there's Semikron (Germany) and Semtech (USA, I guess) as companies that produce discrete diodes like that one. \$\endgroup\$
    – Marcus Müller
    Commented Jan 1, 2022 at 17:54
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    \$\begingroup\$ Is it exactly 45mm across the flats? Or 1 3/4 inches (44.45mm) ? Might help eliminate country of origin. \$\endgroup\$
    – Criggie
    Commented Jan 2, 2022 at 2:35

2 Answers 2

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It could be a Standard Rectifier Corporation 240E10,R. It appears in this June 1960 catalog. The company seems to be defunct: it was registered in 1960 and then its registration was surrendered in 1964.

enter image description here

I also found a tabulation (also from 1961) which lists its characteristics on page 35 (pdf page 38).

enter image description here

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    \$\begingroup\$ The company logo in the datasheet corner does not match the logo on the diode. Are you sure this is the right company for the logo? \$\endgroup\$
    – Justme
    Commented Jan 1, 2022 at 18:13
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    \$\begingroup\$ @Justme No, I'm not positive. But it's not a datasheet and doesn't claim to be issued by the manufacturer of the part. It's a tabulation, more like a catalog. This was common in the 60s. \$\endgroup\$
    – TypeIA
    Commented Jan 1, 2022 at 18:18
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    \$\begingroup\$ So how do you know it even is the manufacturer of the part? There can be dozens of manufacturers for a standard part number. \$\endgroup\$
    – Justme
    Commented Jan 1, 2022 at 18:23
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    \$\begingroup\$ @Justme Quite true, like I said, I'm not positive. \$\endgroup\$
    – TypeIA
    Commented Jan 1, 2022 at 18:30
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As TypeIA suspected, this is a Standard Rectifier Corporation diode. The logo below is from Electronics, Feb 3, 1961, page 81.

Standard Rectifier Corporation logo.

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    \$\begingroup\$ TWX, wow, that brings back memories. \$\endgroup\$
    – Spehro 'speff' Pefhany
    Commented Jan 2, 2022 at 7:16

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