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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6WL6XBN4245CNSAC63F3DBZKAKG53JXL/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "6WL6XBN4245CNSAC63F3DBZKAKG53JXL",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/JMOVJJBHHE74PXIRVVXCEOWFKX7DLLIC/",
    "sender": {
        "address": "davegoncalves (a) gmail.com",
        "mailman_id": "f97ac5d9d47c4e819df184cb1822b3a7",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/f97ac5d9d47c4e819df184cb1822b3a7/emails/"
    },
    "sender_name": "David Goncalves",
    "subject": "[amsat-bb] Re: Keep It Simple, MM",
    "date": "2007-10-04T15:42:52Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JMOVJJBHHE74PXIRVVXCEOWFKX7DLLIC/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": ">\n> The other huge issue that is often not fully appreciated is the impact of\n> radiation on modern components.  As I'll show at the Symposium, the old\n> familiar 14 and 16-pin plastic DIP devices were quite robust and could\n> tolerate fairly high doses of radiation.  This is not necessarily true\n> anymore.  This is why commercial and military payloads use rad-hardened,\n> space-rated, and screened components.  Commercial Off-The-Shelf (COTS)\n> devices are manufactured for use in a benign environment where failures\n> can\n> be corrected by replacement or repair.\n\n\nHowever, because of the technology of some of the components, they will be\npartially or totally immune.\nTo mind comes the Actel commercial line of FLASH FPGAs, billed as Neutron\nImmune. Any good designer will have the REQUIRED rad hardness in mind with\ndesigning the satellite electronics.\n\nA Failure Modes, Effects and Criticality Analysis (FMECA) will point out the\npoints of the design which present the highest risk, to which one can design\ncontrols to reduce the occurance (or detection and correction) of that\nfailure. Perhaps to mitigate a failure might you use a small section made of\nolder, but rad-hard parts. But the whole design?\n\nSMT is here to stay, all the good modern parts are in SM packages, and logic\nhas already well passed the 14 DIP package stage (no more discrete logic\ncodestores). Unless we are flying into the Sun, or building a vintage\nsatellite, there is little good reason to use old parts in new designs.\n\nDavid Goncalves\nW1EUJ\n",
    "attachments": []
}