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CD40106B: Internal ESD configuration

Brian Wang0928
Genius 12150 points
Part Number: CD40106B
Other Parts Discussed in Thread: SN74AHC14, SN74LV14A

Hello,

When VCC of the CD40106B is disconnected from 5V bias power, but the input pin still proving PWM signals with a certain duty cycle and with 5V level. We found there is a leakage voltage on VCC it's about 3.6V and enabling the device activate. is it normal behavior

Is the leakage to VCC from input pin caused by ESD structure?

How is the ESD structure inside the device?

Is there new device to p2p with this one?

  • 0
    Guru 261450 points

    Yes, CD4000 devices have clamping diodes from the inputs to VCC. The absolute maximum ratings forbid voltages above VCC + 0.5 V; a diode current larger than 10 mA can damage the device.

    The AHC and LV-A families run at 5 V and have overvoltage-tolerant inputs. The CD40106B uses a standard inverter pinout; you can replace it with the SN74AHC14/SN74LV14A.