The CD4069 is a hex inverter, meaning it contains six individual inverters/NOT-gates. The chip has 14 pins and is commonly used for pulse-shaping, high-input impedance amplifiers, or logic circuits, such as oscillators, flip-flops, and counters.

Pin Overview

What is an Inverter/NOT gate?

The CD4069 is a CMOS logic chip that contains six independent inverters. It is used to invert a signal, meaning it takes an input signal and produces an output signal that is the opposite of the input.

How to Use the CD4069 in a Circuit?

To use the CD4069 in a circuit, you need a power supply voltage of 3 to 15V (some versions support up to 20V, so check the datasheet of your version). Connect the power supply to the VDD and GND pins of the chip. You can now use any of the six inverters in the chip.

CD4069 Example Circuit: High-Input Impedance Amplifier

This is a super simple amplifier circuit with a high input impedance. The gain is unknown, and the performance is probably not great. But maybe good enough for your application? The circuit was found in the datasheet.

To build this you’ll need:

• An CD4069 IC
• 10 MΩ resistor (Rf)

Alternatives and Equivalents for CD4069

The 4069 IC is often labeled with a prefix and a suffix, such as CD4069BE, NTE4069, HEF4069, TC4069BP, MC14069, or HCF4069. This is due to the manufacturer of the chip and the technology used, but the functionality and the pins remain the same.