SN74LS646NT

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS646NT is an octal bus transceiver manufactured by Texas Instruments, belonging to the 74LS logic series. It features eight non-inverting channels with three-state outputs and operates within a supply voltage range of 4.75 V to 5.25 V. The device provides a low-level output current of 48 mA and a high-level output current of -15 mA. It exhibits a maximum propagation delay of 15 ns under specified load conditions. Designed for surface-mount applications, it is housed in a 20-pin SOIC package and supports TTL input levels with TTL output levels.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bidirectional data transfer capability with three-state outputs
• Non-inverting signal polarity for direct data path alignment
• TTL-compatible input thresholds ensuring robust noise immunity
• High drive strength suitable for bus-oriented architectures

Buffers, Drivers, Receivers, Transceivers Applications

• Memory module data bus interfacing
• Microprocessor system address and data buses
• Control signal routing in industrial automation systems

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'NT' against the manufacturer's official documentation to confirm the exact tape-and-reel packaging configuration and moisture sensitivity level. Ensure the procurement source provides valid RoHS compliance certificates if required by the assembly process. Cross-reference the ordering part number with the latest TI datasheet revision to avoid obsolete or discontinued variants.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal bus interface with moderate speed requirements is needed. The LS logic family offers a balance between power consumption and switching speed. Verify that the system operating temperature range aligns with the commercial grade specifications. Confirm that the 20-pin SOIC footprint matches the PCB layout constraints and that the 5V supply rail is stable within the specified tolerance.

Buffers, Drivers, Receivers, Transceivers Part Context

This device is part of the broader 74LS646 family of octal bus transceivers. It serves as a standard interface solution for connecting microprocessors to memory or peripheral devices. The SN74LS646NT variant specifically denotes the surface-mount package option. It complements other logic families by providing reliable data isolation and direction control in digital circuits.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Direct pin-to-pin replacements include the SN74LS646N (PDIP) for through-hole compatibility or the SN74LS646PW (TSSOP) for alternative surface-mount footprints. Verify electrical characteristics such as propagation delay and output current capabilities before substituting with generic equivalents from other manufacturers.