- SN74LS257BM
- On Semiconductor
- Quad 2 Input Multiplexer with 3-State Outputs
- SN74LS257BMEL
- On Semiconductor
- Quad 2 Input Multiplexer with 3-State Outputs
- SN74LS257BML1
- On Semiconductor
- Quad 2-Input Multiplexer with 3-State Outputs
- SN74LS257BML2
- On Semiconductor
- Quad 2-Input Multiplexer with 3-State Outputs
- SN74LS257BMR1
- On Semiconductor
- Quad 2-Input Multiplexer with 3-State Outputs
- SN74LS257BMR2
- On Semiconductor
- Quad 2-Input Multiplexer with 3-State Outputs