What is 4049 IC : Pin Configuration & Its Applications

The 4049 IC is a monolithic CMOS IC and that is designed with enhancement-mode transistors of P- channel & N-channel and these are called inverting hex buffers. These ICs are used for logic-level conversions through a single voltage supply. When these ICs are used for the conversion of logic level, the high-level input signal can beat the VCC voltage supply. So these devices are mainly used for converting CMOS to TTL/DTL and also drive two TTL or DTL loads directly.

What is 4049 IC?

CD4049 IC is a hex inverter buffer that includes six NOT gates on a single package & it through a maximum rating input voltage supply from 3v – 15v & highest current rating at 18volts is 1mA. The IC is mainly designed to use CMOS TTL or DTL converters. It is also capable to drive two Transistor-Transistor Logic otherwise Diode-Transistor Logic loads.

4049 IC Hex Inverter Buffer
4049 IC Hex Inverter Buffer

The operating temperature of this inverter IC ranges from -40°C – 80°C. This IC can be used to design a Pulse generator or square wave oscillator generator circuit. These ICs are used in maximum voltage applications because it has an extensive range of operating voltage that ranges from 3V – 18V.

The main function of this inverter IC is to change the high-level logic to low & low-level logic to high. Thus, it is applicable in the conversions of logic level. The value of the input voltage signal is higher as compared to supply voltage especially while converting logic levels.

An alternative ICs of 4049 IC are; HEF4049B IC, CD4050B IC, 74HCT04 Hex Inverter IC & 74LS14 Schmitt Trigger Hex Inverter IC.

Pin Configuration of 4049 IC

The 4049 IC has 16-pins where each pin and its functionality are discussed below.

4049 IC Pin Configuration
4049 IC Pin Configuration
  • Pin1 (VDD): It is a +ve supply pin for IC
  • Pin2 (G): It is an inverting o/p 1 for i/p 1
  • Pin3 (A): It is an input-1
  • Pin4 (H) : it is an inverting o/p-2 for input-2
  • Pin5 (B): It is an input-2
  • Pin6 (I): Inverting o/p-3 for i/p-3
  • Pin7 (C): It is an input-3
  • Pin8 (VSS): It is a negative supply for IC
  • Pin9 (D): It is an input-4
  • Pin10 (J): It is an inverting o/p-4 for i/p-4
  • Pin11 (E): It is an input-5
  • Pin12 (K): It is an inverting o/p-5 for i/p- 5
  • Pin13 (NC): It is not connected pin
  • Pin 14(F): It is an i/p-6
  • Pin 15 (L): Inverting output-6 for input-6
  • Pin16 (NC): It is not a connected pin

Features & Specifications

The features of IC 4049 include the following.

  • It is mostly used in the circuit of voltage multiplier
  • The highest i/p current is 1uA at 18v above the complete package range of temperature
  • Allows maximum input voltage supply
  • It is available in different packages like SOIC, PDIP, TSSOP, SO with 16-pins
  • It is used to reduce the high logic levels
  • For quiescent current, it is tested at 20 V
  • Maximum sink current is used for driving 2-TTL loads
  • Particular input safety permits input voltages superior to VDD
  • Model is 4049
  • CMOS Type
  • Logic Function is Hex Inverting Buffer;
  • SOIC16 Case
  • SMD Mounting

The specifications of IC 4049 include the following.

  • Input voltage supply ranges from 3v -18v
  • Input voltage increases from 15 volts, then output current also changes from 1.8mA to 26mA
  • Maximum input capacitance – 22.5pf
  • Ambient Temperature is -40 to +85°C
  • The maximum current supply is 50mA

How to Use 4049 IC?

The 4049 IC is used in voltage doubler circuit from 12Volts to 24 Volts which is shown below. Voltage doublers or multipliers are used to multiply or to make double the input voltage.

Generally, the transformer is used to step up the voltage; however, they are not possible due to their cost & size. The circuit-like voltage doubler is designed with capacitors & diodes. Thus, as compared to transformers, these circuits are very effective and have less costly.

Voltage Doubler Circuit using 4049 IC
Voltage Doubler Circuit using 4049 IC

These circuits are quite related to rectifier circuits as they change AC to DC; however, voltage doubler circuits not only change AC to DC but also generate extremely high DC voltage.

These circuits are applicable wherever High DC voltage needs to be produced through less AC voltage & less current is necessary such as microwave ovens, LED torch, CRT monitors & computers.

The required components of voltage doubler circuit include breadboard, connecting wires, a CD4049 IC, capacitors – 0.1uf & 220uf, 6.7k ohm resistor, 2- 1N4007 Diodes &voltage supply like 5V, 9V & 12V

Circuit Working

According to the above circuit diagram, the arrangement of both the components like resistor & capacitor can be done through two NOT gates to build an oscillator circuit. The leftover four NOT gates are allied in parallel to build a buffer &charge the C2 capacitor.

As an input voltage, DC supply voltage is given then the C2 capacitor will start charging using the buffer circuit that is built through the 4- NOT gates of the IC. Here capacitor ‘C2’ charges until it reaches the maximum i/p voltage.

Now the ‘C2’ capacitor performs like the next power source for Vin. In the above circuit, both the diodes like D1& D2 are connected in forwarding bias. So ‘C3’capacitor begins charging through the double otherwise combined supply voltage & ‘C2’ capacitor. Therefore, capacitor ‘C3’ will charge through the combined voltage value that is almost the double of Vin. So finally we can obtain double voltage beyond ‘C3’ capacitor-like output.

Here, the output voltage is obtained by providing input voltages like 5v, 9v & 12v whereas the practical o/p voltage can be obtained beyond the ‘C3’capacitor:

  • If the input voltage is 5V, the output voltage is 10V and the practical output voltage is 9.04V
  • If the input voltage is 9V, the output voltage is 18V and the practical output voltage is 16.09V
  •  If the input voltage is 12V, the output voltage is 24V and the practical output voltage is 23.1V


The general characteristics of CMOS ICs for the 4000 series include the following

  • Inputs
  • Voltage Supply
  • Outputs
  • Fan-out
  • Gate Propagation Time
  • Power Consumption
  • Frequency

Where to Use/Applications

The applications of 4049 IC include the following.

  • This 4049 IC is used to make simple oscillators & clock pulse generators.
  • This IC can be applicable whose operation mainly depends on two states like low state or high states (0 or 1)
  • This IC is used to make different circuits like simple toggling, voltage multiplier & a square wave oscillator
  • It is also useful in reversing the o/p
  • Voltage Multiplier Circuit
  • Converters from CMOS to DTL/TTL
  • Source Drivers/ Current Sink
  • CMOS Hex Inverter
  • Logic level Converter from High to Low
  • This IC is used to build various circuits like electronic eye, touch ON/OFF circuit, LED Torch circuit, magic eye circuit, speed control of a DC motor, function generator circuit, delay timers, etc

Thus, this is all about an overview of the IC 4049 datasheet which includes its pin configuration, specifications, features, working with applications. Here is a question for you, what are the advantages and disadvantages of 4049 IC?

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