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. 74LS07 hex buffer and driver feature high-voltage open-collector outputs to interface with high-level circuits or for driving high-current loads. They are also characterized for use as buffers for driving TTL inputs. The 74LS07 device have a rated output voltage of 30 V. The maximum sink current is 40 mA.

74LS07 Features
- Six Independent Hex Buffer Gates
- Open Collector Outputs Require Pull-Up Resistors
- Open Collector Type Suitable for Indicator Lamps and Relays
- Input Clamping Diodes
- Standard TTL Switching Voltages
74LS07 Specifications
Supply Voltage | 4.75 – 5.25Vdc |
Maximum Clock Frequency | 40Mhz |
Power Dissipation | 2mW/gate @100kHz |
Minimum Output Current | 8mA |
Propagation Delay | 10nS |
Fan Out (TTL Loads) | 20 |
74LS07 Pinout Diagram

74LS07 Pin Description
Pin No | Pin Name | Description |
1 | A1 | Hex Buffer 1 Input |
2 | Y1 | Hex Buffer 1 Output |
3 | A2 | Hex Buffer 2 Input |
4 | Y2 | Hex Buffer 2 Output |
5 | A3 | Hex Buffer 3 Input |
6 | Y3 | Hex Buffer 3 Output |
7 | GND | Ground |
8 | Y4 | Hex Buffer 4 Output |
9 | A4 | Hex Buffer 4 Input |
10 | Y5 | Hex Buffer 5 Output |
11 | A5 | Hex Buffer 5 Input |
12 | Y6 | Hex Buffer 6 Output |
13 | A6 | Hex Buffer 6 Input |
14 | VCC | Positive Supply |
74LS07 Circuit
Here is a simple circuit for Buffer Implementation using a single NPN Transistor.

Applications
- AV Receivers
- Audio Docks: Portable
- Blu-ray Players and Home Theaters
- MP3 Players or Recorders
- Personal Digital Assistants (PDA)
- Power: Telecom/Server AC/DC Supply: Single
- Controller: Analog and Digital
- Solid-State Drives (SSD): Client and Enterprise
- TVs: LCD, Digital, and High-Definition (HDTV)
74LS07 Alternative Equivalent
74LS541
Download 74LS07 Hex Buffer/Driver (Open Collector) Datasheet from the link given below.