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SN74HC14: output capability

Gene Qiu
Intellectual 1720 points
Part Number: SN74HC14
Other Parts Discussed in Thread: UCC27517, SN74LVC1G14

Hi Team

When using Schmitt triggers  to control MOS , but  the output current does not reach the current required for MOS conduct (e.g. Schmitt triggers single channel maximum output 25mA, but actual MOS on-current may be up to 200mA) Would this portion of the power supply damage the Schmitt trigger?

It's just about moment that instance 200 mA, probably within 100 ns, is needed to charge the capacitor to turn on MOS, is this continuous 25mA  enough to charge the capacitor to turn on the MOS , it may cause a delay to turn on. But Will this damage the schmitt trigger?

Best Regards

  • 0
    Guru 243220 points

    The absolute maximum rating of 25 mA must not be exceeded, not even for a short time. If you limit the current so that it stays below that, the device will not be damaged.

    Why are you using such an old device? The SN74LVC1G14 has a 50 mA limit. For larger loads, there are specialized gate drivers like the UCC27517.