Dual NAND (4 input) 7420

The Dual NAND (4 input) 7420 is a 74-series logic IC that contains two independent NAND gates, each with four inputs. Each output goes low only when all four of its inputs are high; otherwise it stays high. It is used to detect when several signals are active at the same time, to decode addresses and counter states, and in digital electronics courses.

Dual NAND (4 input) 7420 Specifications

• Logic function: 2 × 4-input NAND, Y = NOT(A·B·C·D)
• Package: 14-pin DIP, through-hole
• Supply: 5 V, VCC on pin 14 and GND on pin 7
• Gate 1: inputs on pins 1, 2, 4 and 5, output on pin 6
• Gate 2: inputs on pins 9, 10, 12 and 13, output on pin 8
• Unused pins: 3 and 11 are not connected

Dual NAND (4 input) 7420 Applications

• Detecting when four signals are high at the same time
• Decoding counter states, for example to reset a counter at a set value
• Building AND gates (with an inverter) and other combinational logic
• Address decoding in simple microprocessor and memory circuits
• Digital logic lab experiments in schools and universities

What's in the Box

• 1 × 7420 dual 4-input NAND gate IC

Tip: Tie any unused input to VCC (directly or through a 1 kΩ resistor) to use a gate as a 3- or 2-input NAND; floating TTL inputs act high but pick up noise. Fit a 100 nF capacitor between pins 14 and 7 close to the chip.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.