SN74LS245 Octal Bus Transceiver with 3-State Outputs
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Prices updated: 13 Oct 2026
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About this product
The SN74LS245 is an octal bus transceiver from the 74LS TTL family, used to move 8-bit data between two buses in a selected direction. A DIR pin sets the transfer direction and an active-low enable pin places the outputs in a high-impedance state. It is used in microcontroller and digital bus interfacing circuits.
Specifications
- Logic family
- TTL (74LS series)
- Type
- Octal bus transceiver
- Output
- 3-state
- Supply voltage
- 5 V (4.75 V to 5.25 V)
- Direction control
- DIR pin
- Package
- 20-pin DIP
Frequently asked questions
How does the DIR pin control data direction?
DIR selects the transfer direction between the A and B buses. In the standard 245 truth table, a high DIR transfers data from A to B and a low DIR transfers from B to A.
How is this different from the SN74HC245?
The LS version is a TTL device for 5 V supplies, while the HC version is CMOS with a wider 2 V to 6 V supply range and different input thresholds. Check your logic levels before substituting one for the other.
