74LS155 Dual 2-to-4 Line Decoder/Demultiplexer, TTL IC
Part number: 74LS155Integrated Circuits (ICs)
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Prices updated: 13 Oct 2026
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About this product
The 74LS155 is a dual 2-to-4 line decoder/demultiplexer from the low-power Schottky TTL (LS) family. Each half converts a 2-bit input into one of four active-low outputs, and is used for chip selection, address decoding and logic routing.
Specifications
- Logic family
- 74LS (TTL, low-power Schottky)
- Function
- Dual 2-to-4 decoder/demultiplexer
- Outputs
- 4 active-low per section
- Supply voltage
- 4.75 V to 5.25 V
- Pin count
- 16
Frequently asked questions
Which pins are power and ground?
On the 16-pin package, VCC is pin 16 and GND is pin 8. Add a decoupling capacitor close to the supply pins.
Can I use it with a 3.3 V microcontroller?
The chip needs a 5 V supply. A 3.3 V microcontroller can often drive its inputs, but verify the logic levels for your exact circuit.
