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trurle
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- TL;DR Summary
- Searching mechanism and prevention for observed anomaly with rapid unscheduled disassembly of 74HC14 IC
Recently i am trying to put in use a stock of old 74x series microchips manufactured around ~2000 AD.
Unfortunately, one of microchips 74HC14 (hex schmitt trigger inverter) in SOIC-14 package have exploded in test setup in the moment the power was applied.
Loud "popping" sound, flash of blue light, and corner of package around pin 14 (Vdd), measuring around 2mm, shattered. Exposed lead frame from pins 14 and 13 has no visible damage. Chip appears to be "open circuit" for supply current afterward though.
Did anybody experienced similar behavior before? Any ways to avoid it?
Operating conditions were "normal" - AC-DC voltage converter with 5V output (which turned out to be still ok after incident), and either weak pull-ups or ground ties at schmitt trigger inputs.
Unfortunately, one of microchips 74HC14 (hex schmitt trigger inverter) in SOIC-14 package have exploded in test setup in the moment the power was applied.
Loud "popping" sound, flash of blue light, and corner of package around pin 14 (Vdd), measuring around 2mm, shattered. Exposed lead frame from pins 14 and 13 has no visible damage. Chip appears to be "open circuit" for supply current afterward though.
Did anybody experienced similar behavior before? Any ways to avoid it?
Operating conditions were "normal" - AC-DC voltage converter with 5V output (which turned out to be still ok after incident), and either weak pull-ups or ground ties at schmitt trigger inputs.