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CD40106B: Transient Current Limitation

Yazhu Liu
Intellectual 1410 points
Part Number: CD40106B
Other Parts Discussed in Thread: UCC27517

Hi Team,

May I know if CD40106B have transient current limitation? In datasheet, we only specify IOHmin and IOLmin, I suppose it's the minimum current sink/source from the device?

Please refer to the schematic as below, customer test the voltage drop on R1(510ohm) to capture the device output current. And observe a transient up to 5.92V(equal to 11mA). Will this transient bring to any potential risk here? Thanks.

Best Regards,

Livia

  • 0
    Guru 267350 points

    The absolute maximum ratings must not be exceeded, not even for a short time.

    For CD4000 devcices, the current limit is not specified explicitly, but is implied by the power dissipation limit. According to figures 1 and 3, the voltage drop for 11 mA is about 2.5 V, which results in a power dissipation of about 28 mW, which is way below the 500 mW limit.

    If you have fewer than six channels, it is possible to connect multiple outputs in parallel to share the current.

    BTW: A much smaller but more expensive solution would be the UCC27517.