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4071 IC Quad 2-Input OR Gate
EGP23.00
Description
4071 IC Quad 2-Input OR Gate
The 4071 Quad 2-Input OR Gate IC is a CMOS integrated circuit that contains four independent OR gates in a single 14-pin package. Each gate performs a logical OR operation on two inputs and outputs a high signal if one or both inputs are high. This device is part of the CMOS CD4000 series of digital logic ICs and is designed with low power consumption, wide supply voltage range, and high noise immunity for reliable operation in logic-level systems. The IC’s buffered outputs and standardized logic characteristics make it suitable for a broad range of digital electronic designs and embedded applications.
Features:
- Four independent 2-input OR gates in a single package.
- Wide supply voltage range for flexible system integration.
- Low power consumption suitable for battery-operated devices.
- High noise immunity and static discharge protection on all inputs.
- Symmetrical output characteristics with equal source and sink currents.
Specifications:
| Parameter | Value |
|---|---|
| Logic Type | CMOS Quad 2-Input OR Gate |
| Supply Voltage Range | 3 V – 15 V (parametric rating up to 18 V) |
| Number of Gates | 4 OR gates |
| Inputs per Gate | 2 |
| Input Type | CMOS/TTL compatible logic level inputs |
| Input Leakage Current | ≈ ±1 µA max (full temperature range) |
| Output Drive | Buffered CMOS outputs |
| Propagation Delay | ~100 ns (typical at mid-range voltage) |
| Operating Temperature | -55 °C – +125 °C |
| Package Options | DIP-14, SOIC-14 |
CD4071 Pin Configuration:
| Pin Number | Pin Name | Description |
| 1,6,10,15 | OR Gate Input pin (A) | First Input pin for the OR gate |
| 2,5,11,14 | OR Gate Input pin (B) | Second Input pin for the OR gate |
| 3,4,12,13 | OR Gate Output pin (Q) | Output pin for the OR gate |
| 7 | Ground | Connect to the ground of the circuit. |
| 14 | Vcc (Vdd) | Used to power the IC. Typically +5V is used |
Note: Complete Technical Details can be found in the CD4071 datasheet provided below this article.
Where to use CD4071 IC:
The CD4071 is a Dual Input OR Gate with a Quad package. Meaning it has four OR gate IC inside it, each of which can be utilized independently. AND gates are used in building Logic level circuits like Encoder, Decoder multiplexers, etc. Logic-level gates like CD4071 and flip-flops play a vital role in digital electronics.
If you are looking for an IC to perform logic level OR operation with two inputs, then this IC might be the right choice for you. If you have more than two inputs for your OR gate, then you should look into three-input and four-input OR gates.
Logic OR explanation:
The logic OR operation is very simple, since this is a two-input OR gate we will have only two inputs which is A and B respectively. The output of the OR gate is called Q. The truth table for the OR gate is shown below.
| A | B | Q |
| 0 | 0 | 0 |
| 1 | 0 | 1 |
| 0 | 1 | 1 |
| 1 | 1 | 1 |
How to use CD4071 IC:
To use the CD4071 IC, just power it using the Vcc (pin 14) and ground (pin 8) lines. The typical operating voltage of the IC is +5V, but it can also be operated at +5V, +10V, and +15V. The output voltage of the IC on the pin Q will be equal to the operating voltage of the IC. As per the truth table shown above, when either one or both the input of the Gate is high the output will be high. The complete working of the gate with a sample CD4071 circuit is shown in the GIF file below.
The input for the gate is controlled by using a switch connected to pin A and B of the Gate. A pull down resistor of 100k is used to hold the logic to low (logic 0) when the switch is left floating. To visualize the output we have connected a LED to the output pin Q. The resistor 680R is used to limit the current through the LED.
Applications:
- Basic Logic Circuits
- Encoders and Decoders
- Multiplexers and De-multiplexers
- Oscillator circuits
- Networking and Digital Systems
