74LS37 Quad 2-input NAND Buffer


The 74LS series of integrated circuits (ICs) was one of the most popular logic families of transistor-transistor logic (TTL) logic chips. 74LS series is a bipolar, low-power Schottky IC. 74LS37 Quad 2-input NAND Buffer contains four independent 2-input NAND buffer gates.

74LS37 Features

  • Four Independent NAND Buffer Gates
  • Standard Pin Configuration
  • Fast Switching Times
  • Operating Temperature up to 70°C
  • Standard TTL Switching Voltages

74LS37 Specifications

Supply Voltage4.75 – 5.25Vdc
Maximum Clock Frequency40Mhz
Power Dissipation2mW/gate @100kHz
Minimum Output Current8mA
Propagation Delay10nS
Fan Out (TTL Loads)20

74LS37 Pinout Diagram

74LS37 Pin Description

Pin NoPin NameDescription
1A1NAND Buffer 1 Input 1
2B1 NAND Buffer 1 Input 2
3C1 NAND Buffer 1 Output
4A2 NAND Buffer 2 Input 2
5B2 NAND Buffer 2 Input 2
6C2 NAND Buffer 2 Output
8C3 NAND Buffer 3 Output
9A3 NAND Buffer 3 Input 1
10B3 NAND Buffer Input 2
11C4 NAND Buffer 4 Output
12A4 NAND Buffer 4 Input 1
13B4 NAND Buffer 4 Input 2
14VCCPositive Supply

74LS37 Circuit


  • Burglar alarm or theft alarm
  • Freezer warning buzzer
  • Light activated theft alarm
  • Automatic watering system.

74LS37 Alternative Equivalent


Download 74LS37 Quad 2-input NAND Buffer Datasheet from the link given below.