7411 (74LS11, 74HC11): the triple 3-input AND gate chip, live

The 7411 is a 14-pin chip with three independent 3-input AND gates: each output nY is 1 only when all three of its inputs nA, nB and nC are 1. The 74LS11 and 74HC11 share the pinout, with VCC on pin 14 and GND on pin 7. This live chip has all three gates.

Three-input ANDs turn up whenever a signal must wait for three conditions at once: a decoder line that needs three address bits, an enable gated by two control signals, or a product term in a sum of products. With 2-input gates that takes two ANDs per term, which is exactly how each gate is built here; the 3-to-8 decoder is the classic place where each output is a 3-input AND. The 7411 has the same pinout as the 7410, its NAND counterpart. All 512 combinations of the nine inputs are checked before the page is built.

Live circuit: click the inputs to toggle them and watch the outputs update. It runs the real simulator, right here on the page.

Open this circuit in the lab →

What you need

3× 3-input AND: 1Y from 1A, 1B, 1C; 2Y from 2A, 2B, 2C; 3Y from 3A, 3B, 3C

Step by step

Power the chip: VCC on pin 14 and GND on pin 7 (5 V for the 74LS part; 2 V to 6 V for the 74HC part).
Each gate has three inputs and one output; find their pins in the pinout below.
Tie every unused input to VCC or GND: a floating CMOS input can drift and draw current.
Set all three inputs of one gate to 1: its output goes to 1. Any 0 on an input gives 0.

7411 pinout

Pin	Name	Pin	Name
1	1A	14	VCC
2	1B	13	1C
3	2A	12	1Y
4	2B	11	3C
5	2C	10	3B
6	2Y	9	3A
7	GND	8	3Y

3-input AND truth table (each gate)

A	B	C	Y
0	0	0	0
0	0	1	0
0	1	0	0
0	1	1	0
1	0	0	0
1	0	1	0
1	1	0	0
1	1	1	1

Pin numbers are for the 14-pin DIP and SOIC packages, from TI's SN74HC11 datasheet, checked 2026-10-25. Each gate is independent; the chip only shares the power pins.

You can also read the full theory in the lesson on the AND gate. Prefer to build it yourself from scratch? Open the digiwleea lab and place the gates on the canvas, or start from the logic gate simulator.

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Each of these is one step from a transistor to a working CPU. Build every gate from CMOS transistors and work all the way up in the free digiwleea lab, with the free theory reference alongside.

Open the 7411 triple 3-input AND chip in the lab →

Frequently asked

What is a 7411 chip?

A 14-pin chip with three independent 3-input AND gates. VCC is pin 14 and GND pin 7. Each output is HIGH only when all three of its inputs are HIGH.

What is the 7411 pinout?

Pin 1 1A, 2 1B, 3 2A, 4 2B, 5 2C, 6 2Y, 7 GND, 8 3Y, 9 3A, 10 3B, 11 3C, 12 1Y, 13 1C, 14 VCC, the same as the 7410.

How do you make a 3-input AND gate from 2-input gates?

Chain two: AND the first two inputs, then AND that result with the third. That is what each gate on this page does.

What is the difference between the 74LS11 and the 74HC11?

The same three gates and pinout. The 74LS11 is TTL for 5 V; the 74HC11 is CMOS for 2 V to 6 V with lower power.