SN74LS21 Dual 4-Input AND Gate TTL IC
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Prices updated: 13 Oct 2026
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About this product
The SN74LS21 is a 74LS-series TTL logic IC containing two independent 4-input AND gates. It is used for basic logic in digital circuits, such as combining enable or status signals before feeding another stage. It operates from a 5 V supply and is commonly supplied in a 14-pin DIP package.
Specifications
- Logic family
- TTL (74LS series)
- Function
- Dual 4-input AND gate
- Supply voltage
- 5 V (4.75 V to 5.25 V)
- Package
- 14-pin DIP
Frequently asked questions
What supply voltage does the SN74LS21 need?
It requires a 5 V supply within 4.75 V to 5.25 V. Do not connect its 5 V outputs directly to 3.3 V-only inputs without level shifting.
How should unused inputs be handled?
Do not leave unused inputs floating. Tie them to VCC (logic high), either directly or through a resistor, or connect them to a used input of the same gate.
