SN74LS245NS Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
SN74LS245NS is an 8-channel bidirectional bus transceiver from Texas Instruments with three-state outputs, operating from a 5V supply. It provides low-power TTL logic level bus buffering with direction control and output enable, housed in a 20-pin SOP package for data bus interfacing applications.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- SN74LS245NS Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 8-channel bidirectional bus transceiver with three-state outputs for shared bus support
- Direction control pin enabling A-to-B or B-to-A data flow selection
- TTL-compatible 5V operation with low-power Schottky logic for reduced power consumption
- Output enable pin for bus isolation and tri-state driving capability
- 20-pin SOP package enabling compact SMD PCB integration
- High drive capability suitable for driving heavily loaded data buses
Applications
The SN74LS245NS is widely used as a bidirectional data bus buffer in microprocessor and microcontroller systems where address and data buses must drive multiple loads simultaneously. It enables level and current buffering between CPU data buses and peripheral ICs, memory banks, or backplane connectors in industrial and computing boards. Legacy embedded designs, bus extenders, and data acquisition backplanes rely on its 8-channel three-state bidirectional architecture for reliable signal integrity across multiple bus loads.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74LS245NS:
suggested
suggested
suggested
Frequently Asked Questions
How many bidirectional data channels does the SN74LS245NS support, and what bus widths can it handle?
The SN74LS245NS provides 8 bidirectional channels, enabling it to buffer a full 8-bit data bus in a single IC. For wider 16-bit or 32-bit buses, two or four devices can be cascaded in parallel, each handling 8 bits, with shared direction and output enable control signals.
What is the supply voltage of the SN74LS245NS, and is it compatible with modern 3.3 V logic systems?
The SN74LS245NS operates from a 5V supply voltage and uses TTL logic thresholds, which means its outputs are not natively compatible with 3.3 V CMOS logic without level shifting. For modern 3.3 V microcontroller interfaces, a level translator or a 3.3 V compatible bus transceiver such as the SN74LVC245A is typically recommended instead.
What advantages does the three-state output of the SN74LS245NS provide in a shared bus topology?
The three-state outputs allow the SN74LS245NS to disconnect from the bus when the output enable pin is deasserted, presenting a high-impedance state on all 8 output pins. This prevents bus contention when multiple drivers share a common 8-bit data bus, which is essential in multi-master CPU systems or memory-mapped peripheral architectures.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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