7421 Dual 4-Input AND Gate IC | TTL Digital Logic

The 7421 is a TTL logic IC containing two independent 4-input AND gates for digital electronics projects. It suits control circuits and logic experiments where four conditions must be satisfied together. For students, technicians and makers in Lebanon, this integrated circuit supports digital circuit development, practical learning and compatible repairs.

Each gate produces a HIGH output only when all four inputs are HIGH; if any input is LOW, the output remains LOW. The standard 7421 operates from a nominal 5V supply, with a recommended range of 4.75–5.25V. It works with compatible TTL logic circuits for signal gating and multi-condition control. cnic.ro

Key Features

• Model: 7421
• Product: Dual 4-input AND gate IC
• Specs: TTL logic, 2 independent gates, 4 inputs per gate, nominal 5V supply
• Capabilities: Performs positive-logic AND operations
• Use cases: Control logic, signal gating, digital experiments and compatible circuit repairs
• Compatibility: TTL circuits with suitable supply voltage and logic levels
• Lebanon relevance: Suitable for electronics coursework, prototyping and repair workshops across Lebanon