74LS05 Hex Inverter (Open Collector)


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. 74LS05 Hex Inverter (Open Collector) contains six independent inverters. To perform correctly, the open-collector outputs require pullup resistors. These devices may be connected to other open-collector outputs to implement active-low wired-or active-high wire-AND functions. Open-collector devices often are used to generate high VOHlevels

74LS05 Features

  • Six Independent INVERT Gates
  • Open Collector Outputs Require Pull-Up Resistors
  • Also Available in SMD Type
  • Operating Temperature to 70°C
  • Standard TTL Switching Voltages

74LS05 Specifications

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

74LS05 Pinout Diagram

74LS05 Pin Description

Pin NoPin NameDescription
1A1Inverter Gate 1 Input
2B1 Inverter Gate 1 Output
3A2 Inverter Gate 2 Input
4B2 Inverter Gate 2 Output
5A3 Inverter Gate 3 Input
6B3 Inverter Gate 3 Output
8B4 Inverter Gate 4 Output
9A4 Inverter Gate 4 Input
10B5 Inverter Gate 5 Output
11A5 Inverter Gate 5 Input
12B6 Inverter Gate 6 Output
13A6 Inverter Gate 6 Input
14VCCPositive Supply

74LS05 Circuit

Here is one simple circuit of 74ls05 with one resistor and LED at the output of a NOT gate.


  • Adjustable-speed ac motor drives.
  • Uninterrupted power supplies (UPS)
  • Running appliances of ac used in an automobile battery.

74LS05 Alternative Equivalent

74LS04, 74LS06, 74LS07, 74LS14

Download 74LS05 Hex Inverter (Open Collector) Datasheet from the link given below.