The 74×06 (ex 74LS06) is a chip with six open-collector inverters that has a maximum output voltage of 30V and a sink current of 40 mA so that they can interface with high-level circuits (such as MOSFETs), or for driving high-current loads.
When you have an open collector output, it means it’s easy to connect it to other chips that use different logic levels. However, it also means you can’t just swap it out with a regular inverter chip.
In this guide, you will learn everything you need to know about this chip and how to use inverters in your projects.
What does the 74HC06 / 74LS06 do?
The 74×06 gives you six open collector inverters that you can use individually. An inverter (or NOT gate) is a logic gate that outputs the opposite of the input. In the truth table below, you can see what the output will be for any given input:
How To Use This Chip
The 74LS06 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 74HC06 supports 2V to 6V, while the 74LS06 only supports 5V.
74×06 Pinout
The 74×06 has 14 pins and contains six open-collector inverters, each with a maximum output voltage of 30V. Its pins are laid out as shown in the pinout diagram below:
| Pin # | Type | Description |
|---|---|---|
| 1 | Input | Input to the first NOT gate. |
| 2 | Output | Open-collector output from the first NOT gate. |
| 3 | Input | Input to the second NOT gate. |
| 4 | Output | Open-collector output from the second NOT gate. |
| 5 | Input | Input to the third NOT gate. |
| 6 | Output | Open-collector output from the third NOT gate. |
| 7 | Power | Connect to ground (GND). |
| 8 | Output | Open-collector output from the fourth NOT gate. |
| 9 | Input | Input to the fourth NOT gate. |
| 10 | Output | Open-collector output from the fifth NOT gate. |
| 11 | Input | Input to the fifth NOT gate. |
| 12 | Output | Open-collector output from the sixth NOT gate. |
| 13 | Input | Input to the sixth NOT gate. |
| 14 | Power | Positive power supply (VCC). Connect to +5V power. |
Technical Specifications
| Physical | |
| Case/Package | PDIP |
| Mount | Through Hole |
| Number of Pins | 14 |
| Technical | |
| High Level Output Current | -250 µA |
| Logic Function | Buffer, Inverter, Inverting |
| Low Level Output Current | 40 mA |
| Max Operating Temperature | 70 °C |
| Max Supply Voltage | 5.25 V |
| Min Operating Temperature | 0 °C |
| Min Supply Voltage | 4.75 V |
| Nominal Supply Current | 100 µA |
| Number of Bits | 6 |
| Number of Channels | 6 |
| Number of Circuits | 6 |
| Number of Elements | 6 |
| Number of Gates | 6 |
| Number of Input Lines | 6 |
| Number of Inputs | 1 |
| Number of Output Lines | 6 |
| Number of Outputs | 6 |
| Operating Supply Current | 100 µA |
| Operating Supply Voltage | 5 V |
| Polarity | Inverting |
| Propagation Delay | 20 ns |
| Schmitt Trigger Input | No |
| Termination | Through Hole |
| Turn-On Delay Time | 20 ns |
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