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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| Product Series | 74ALS |
| Packaging | Bulk | |
| Part Status | Active |
| Logic Type | Buffer, Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Input Type | - |
| Output Type | 3-State |
| Current - Output High, Low | 15mA, 24mA |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Through Hole |
| Package / Case | 20-DIP (0.300", 7.62mm) |
| Supplier Device Package | 20-PDIP |
The SN74ALS540N3 is an inverting buffer from Texas Instruments, part of the 74ALS logic family. It features a single channel with 3-State output, capable of sinking 24mA and sourcing 15mA. Operating from a 4.5V to 5.5V supply, it is designed for 5V systems. The 20-DIP package is ideal for through-hole PCB designs and prototyping. Its high drive strength makes it suitable for bus driving and industrial control applications.
- High Sink Current (24mA): Can drive heavy loads such as long bus lines or multiple inputs.
- Inverting Function: Provides signal inversion without additional logic gates.
- 3-State Output: Allows connection to shared buses with high-impedance control.
- DIP Package: Easy to handle and solder, ideal for prototyping and legacy designs.
Legacy 5V System Inversion
In older 5V industrial systems, this inverting buffer can be used to invert control signals while providing a robust buffered output.
Through-Hole Prototyping
The 20-DIP package is breadboard-friendly, making it ideal for prototyping and educational labs.
Bus Driver for Memory Systems
With 24mA sink capability, it can drive heavy capacitive loads on memory data or address buses.
Signal Polarity Correction
Use it to correct signal polarity in systems where an active-low signal needs to be converted to active-high, or vice versa.
Industrial PLC I/O
Its high drive current and 3-State outputs make it suitable for interfacing with industrial controllers and sensors.
Test Equipment Interfaces
In bench test equipment, it can buffer and invert trigger signals with minimal delay.
- Q: What is the logic family of the SN74ALS540N3?
- A: It belongs to the 74ALS family, which uses advanced low-power Schottky technology.
- Q: What function does this IC perform?
- A: It is an inverting buffer with 1 channel, providing signal inversion and buffering.
- Q: What is the output type?
- A: It has 3-State outputs for bus-oriented applications.
- Q: What is the voltage range?
- A: It operates from 4.5V to 5.5V, standard for 5V logic systems.
- Q: What are the output current ratings?
- A: It can sink 24mA and source 15mA, offering strong drive capability.
- Q: What package is it available in?
- A: It comes in a 20-DIP (0.300", 7.62mm) package, suitable for through-hole assembly.
SN74ALS540N3.pdf
- Q: What is the logic family of the SN74ALS540N3?
- A: It belongs to the 74ALS family, which uses advanced low-power Schottky technology.
- Q: What function does this IC perform?
- A: It is an inverting buffer with 1 channel, providing signal inversion and buffering.
- Q: What is the output type?
- A: It has 3-State outputs for bus-oriented applications.
- Q: What is the voltage range?
- A: It operates from 4.5V to 5.5V, standard for 5V logic systems.
- Q: What are the output current ratings?
- A: It can sink 24mA and source 15mA, offering strong drive capability.
- Q: What package is it available in?
- A: It comes in a 20-DIP (0.300", 7.62mm) package, suitable for through-hole assembly.