74LS03 Quad 2-input NAND Gate
74LS03 overview
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. 74LS03 Quad 2-input NAND Gate contains four independent 2-input NAND gates. The open-collector outputs require pull-up resistors to perform correctly. They may be connected to other open-collector outputs to implement active-low wired-OR or active-high wired-AND functions. Open-collector devices are often used to generate higher VoH levels.
Key specifications
Datasheet
74LS03 features
- Four Independent NAND Gates
- Open Collector Outputs Require Pull-Up Resistors
- Also Available in SMD Type
- Operating Temperature to 70°C
- Standard TTL Switching Voltages
74LS03 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | A1 | NAND Gate 1 Input 1 |
| 2 | B1 | NAND Gate 1 Input 2 |
| 3 | C1 | NAND Gate 1 Output |
| 4 | A2 | NAND Gate 2 Input 1 |
| 5 | B2 | NAND Gate 2 Input 2 |
| 6 | C2 | NAND Gate 2 Output |
| 7 | GND | Ground |
| 8 | C3 | NAND Gate 3 Output |
| 9 | A3 | NAND Gate 3 Input 1 |
| 10 | B3 | NAND Gate 3 Input 2 |
| 11 | C4 | NAND Gate 4 Output |
| 12 | A4 | NAND Gate 4 Input 1 |
| 13 | B4 | NAND Gate 4 Input 2 |
| 14 | VCC | Positive Supply |
74LS03 applications
- Burglar alarm or theft alarm.
- Freezer warning buzzer.
- Light activated theft alarm.
- Automatic watering system
Application circuit
More about 74LS03
74LS03 Circuit
Below is a simple NAND gate circuit implementation using diodes and one NPN transistor. You can use 1n4007 as diode and r1,r2 of 10k ohm, and bc547 general purpose transistor.
74LS03 Alternative Equivalent
74LS00, 74LS10, 74LS20, 74LS30
Download 74LS03 Quad 2-input NAND Gate from the link given below.
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