Failed ICs and components

I made an inventory of the defective TTL?s I have, other than I initially though there is a reasonable spread over types and brands. Other than the NS DM7400 there are no types with an extensive failure rate. The list talks for itself. -Rik Type HP Number 1820- Quantity Brand CER Date 7495AN 1 Siemens 7417 8H08/74H08 1 ?? PCF7427 93L00PC 1 7302 9N03/7403 1 Fairchild 7328 DM7400N 14 National Semiconductor 352,422,424,401,351,435,315,215 DM7403N 4 National Semiconductor 315 DM7404N 5 National Semiconductor 317,315 DM7408N 2 National Semiconductor 307 DM7410N 2 National Semiconductor 308,217 DM74121N 6 National Semiconductor 313,315,314 DM74195N 1 National Semiconductor 241 DM7420N 1 National Semiconductor 211 DM7432N 2 National Semiconductor 314,413 DM7474N 5 National Semiconductor 435,349 DM7493N 1 Texas Instruments 7252 DM7495N 2 National Semiconductor 242,241 DM74H00N 1 National Semiconductor 334 DM74H08N 1 National Semiconductor 229 DM74L00N 1 National Semiconductor 337 DM74L04N 3 National Semiconductor 313,351 DM74L10N 1 National Semiconductor 423 DM74L74N 1 National Semiconductor 316 DM74L86N 1 National Semiconductor 317 DM74LS373N 1 National Semiconductor 8005 N8885A 1 Signetics 7402 N8T20N 1048 1 Signetics 7915 SN7400J 1 Texas Instruments 7313 SN7400N 2 Texas Instruments 7405,7335 SN7402N 1 Texas Instruments AS7419 SN7404N 3 Texas Instruments 7344,7402,AS7406 SN7406N 0471 1 Texas Instruments 8044S SN7407N 0668 2 Texas Instruments H7845,AS7414 SN74107N 2 Texas Instruments 7945B,7414 SN74121J 1 Texas Instruments X 7326 SN74123N 0579 4 Texas Instruments 7406,8014 SN74155N 2 Texas Instruments 7222 SN7416N 1 Texas Instruments AHA741 SN74191N 1 Texas Instruments M7628 SN74193N 3 Texas Instruments FF7606,FF7536 SN74193N 1 Texas Instruments 7516 SN7451N 1 Texas Instruments 7427 SN7474N 1 Texas Instruments 7339 SN7475N 1 Texas Instruments 7349 SN7493AN 1 Texas Instruments 7235 SN7493AN 1 Texas Instruments AS7344 SN7495AN 4 Texas Instruments BS7402,7227,7244 SN7495N 1 Texas Instruments 7401 SN7496N 1 Texas Instruments M7331 SN74H00N 1 Texas Instruments 7135 SN74H01N 1 Texas Instruments BS7423 SN74H01N 1 Texas Instruments 7252 SN74H04N 2 Texas Instruments 7527,AS7406 SN74H101N 2 Texas Instruments 7217,7336 SN74H108N 1 Texas Instruments 7205 SN74H40N 1 Texas Instruments 7510 SN74H74N 0512 1 Texas Instruments 7419 SN74L04N 2 National Semiconductor 218,313 SN74L42N 1 Texas Instruments 7312A SN74LS00N 1 Texas Instruments M7523 SN74LS03N 3 Texas Instruments 7945 SN74LS08N 1201 1 Texas Instruments 7801 SN74LS244N 1 Texas Instruments 8432B SN74LS257AN 1438 1 Texas Instruments 7927B SN74S04N 1 Texas Instruments UK7949 SN74S374N 2 Texas Instruments M7919X,F9022X 7400 0054 1 Motorola 7315 7410 0068 2 Motorola 7245,7443 7473 0075 1 National Semiconductor 217 7474 0077 2 National Semiconductor 212 74H08 0141 6 National Semiconductor 228,217,604,229,228 MC3001 0141 1 Motorola 7326 7404 0174 1 National Semiconductor 543 7405 0175 1 National Semiconductor 037M 7405 0175 1 National Semiconductor 947 MC3003 / 74H32 0205 1 Motorola 7513 74121 0261 1 Texas Instruments 7410 74121 0261 1 National Semiconductor 425 7403 0269 4 National Semiconductor 345,428 CA3028A 0306 1 National Semiconductor 413 7402 0328 2 National Semiconductor 527,532 7402 0328 1 Motorola 7248 74H00 0370 1 Motorola 7413 74H00 0370 1 Fairchild 7237 74H40 0376 1 Motorola 7334 74H04 0424 1 National Semiconductor 231 7408 0511 6 Fairchild F7421,F7407,F7409,F7428 7413 0537 1 National Semiconductor 533 74L00 0583 1 National Semiconductor 521 74L02 0584 3 National Semiconductor 222,231 74L10 0587 1 National Semiconductor 514 74L30 0589 1 National Semiconductor 232 74L54 0591 1 National Semiconductor 521 74L74 0596 1 Fairchild X SL3459 74L86 0598 3 National Semiconductor 405 9322PC 0616 1 Fairchild 352 9322PC 0616 1 Fairchild X 7221 9324PC 0706 1 Fairchild 7735 9328PC 0741 2 Fairchild X 7240,7309 74C175 1562 2 Signetics L147,B104 74C175 1562 1 National Semiconductor 011 -----Oorspronkelijk bericht----- Van: "Kyle Owen" < <mailto:kylevowen at gmail.com> kylevowen at gmail.com> Verzonden: ?11-?2-?2015 23:57 Aan: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Onderwerp: Failed ICs and components I am writing my master's thesis on accelerated life testing and would like to get a collection of parts to decap and experiment on. What prompted my study is a failed 7474 dual flip-flop in a PDP-8/E. As I later read (on here, I believe) was that the 7474s seem to fail in higher number than other 7400-series ICs. Is this because of a design flaw? I'm not sure (yet), but would like to find out. More recently, I saw a 680k 2W carbon resistor that read 1.3 meg out of circuit. As it turns out, it was in a high voltage portion of the circuit, and I suspect that electromigration caused its failure over time. Many of you are probably already aware that carbon resistors tend to increase in value as they age, though there are a few explanations too for that behavior, as I understand it. I would like to tie all of this together by researching older accelerated life testing schemes, examine how those parts actually fared, and see how current day models might be improved. If anyone has a collection of dead ICs (preferably those that have died inexplicably, and not by extreme overvoltage, for instance), I would like to talk to you about getting a few. If they are 7474s from Texas Instruments, ca. early 1970s, even better! Thanks in advance, Kyle