7400 Series Guide: 74HC11/74LS11 (Triple 3-input AND gates)

The 74×11 (ex 74HC11) is a logic gate chip that has three 3-input AND gates.

In this guide, you will learn everything you need to know about this chip and how you can use AND gates in your own projects.

74HC11 / 74LS11 Package And Pinout
Package and pinout for the 74×11 chip

What does the 74HC11 / 74LS11 do?

The 74×11 gives you three 3-input AND gates that you can use individually. An AND gate is a logic gate that outputs 1 (HIGH) only if all of its inputs are 1 (HIGH). In the truth table below, you can see what the output will be for any given input:

AND gate truth table
Truth table for the AND gate

How To Use This Chip

The 74HC11 comes in a 14-pin package, and you need to connect it to power before you can use it. Most 7400 ICs support a VCC voltage of 5V. One difference between the HC and LS versions of the chip is that the 74HC11 supports 2V to 6V, while the 74LS11 only supports 5V.

The maximum current you can pull out of one output pin is 4 mA when the pin is high (sourcing) or 16 mA when the pin is low (sinking). This can differ between models, so check the datasheet of your model to verify.

Once you’ve connected it to power, you can use any of the three 3-input AND gates inside.

7400 series IC connected to 5V on a breadboard
The 74HC11/74LS11 IC connected to power

74×11 Pinout

The 74×11 has 14 pins and contains three 3-input AND gates laid out as shown in the pinout diagram below:

74HC11 / 74LS11 Pinout
Pin #TypeDescription
1InputInput to the first AND gate.
2InputInput to the first AND gate.
3InputInput to the second AND gate.
4InputInput to the second AND gate.
5InputInput to the second AND gate.
6OutputOutput from the second AND gate.
7PowerConnect to ground (GND).
8OutputOutput from the third AND gate.
9InputInput to the third AND gate.
10InputInput to the third AND gate.
11InputInput to the third AND gate.
12OutputOutput from the first AND gate.
13InputInput to the first AND gate.
14PowerPositive power supply (VCC). Connect to +5V power.
Pin overview for the 74×11 IC

Alternatives and Equivalents for 74HC11 / 74LS11

There are many versions of the 74×11 chip. They all have the same functionality, but with different specifications such as supported voltages and maximum current output.

Here’s a list of a few equivalents of this chip:

  • 74HC11 (High-speed CMOS)
  • 74HCT11 (High-speed CMOS, TTL compatible)
  • 74LS11 (High-speed TTL)
  • 74LVC11 (Low Voltage TTL)
  • 74AC11 (Advanced CMOS)
  • 74ALS11 (Advanced Low-Power Schottky TTL)
  • 74F11 (Very High Speed)
  • 74C11 (CMOS, similar to the 4000-series)

Some manufacturers also add a prefix, such as the SN74HC11 and SN74LS11 by Texas Instruments.

Can’t find the 74×11 anywhere? Then try one of the following IC alternatives:

  • 74×15 – Triple 3-input AND gates (with open-collector outputs).
  • CD4073 – Triple 3-input AND gates

If you can’t find the 74×11 IC in your local electronics store, don’t worry, you’ll most likely find it in one of the stores listed on this page of online stores where you’ll find components and tools for all your electronics projects.

Datasheet for the 74LS11 and 74HC11 chips

Download the PDF datasheet for your version of the 74×11 here:

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