74LS03 Quad 2-Input NAND Gate – Open Collector, DIP-14

The 7403 is a digital logic integrated circuit that contains four independent 2-input NAND gates with open-collector outputs in a single package. Unlike the standard 7400, the 7403 requires external pull-up resistors, allowing flexible interfacing with higher-voltage systems and wired-AND configurations. Operating from a 5V supply, it is compatible with standard TTL logic levels and is commonly used for logic control, signal gating, level shifting, and driving external loads such as LEDs and relays.

Features

- Quad 2-input NAND gate configuration

- Open-collector outputs for flexible interfacing

- Supports wired-AND logic functions

- Standard TTL logic compatibility

- Single 5V supply operation

- External pull-up resistor compatibility

- Can interface with higher-voltage circuits

- Suitable for driving LEDs and relays

- DIP-14 through-hole package

- Breadboard friendly design

- Reliable TTL switching performance

- Useful for logic expansion applications

- Supports custom output voltage levels

- Ideal for educational and industrial digital systems

Specifications

- Model: 7403

- Device Type: Quad 2-Input NAND Gate IC

- Output Type: Open-Collector

- Logic Family: TTL

- Number of Gates: 4

- Inputs per Gate: 2

- Supply Voltage: 5V

- Input Logic Levels: TTL Compatible

- Propagation Delay (Typical): 15ns

- Maximum Output Sink Current: 16mA

- Package Type: 14-Pin DIP

- Mounting Type: Through-Hole

- Operating Temperature Range: 0°C to +70°C

- Application Type: Digital Logic and Level Interfacing

Links

- 3D Model

- Datasheet

Tutorials

- 7403 74LS03 Quad NAND