SN74ALS541NS Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN74ALS541NS is an ALS-logic octal buffer and line driver from Texas Instruments featuring active-LOW output-enable controls and non-inverting 3-state outputs. It operates on a 5 V supply with propagation delays as low as 8 ns and output drive capability of ±24 mA. Housed in a 20-pin Small Outline package for surface-mount bus-interface applications.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- SN74ALS541NS Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Octal (8-bit) non-inverting 3-state buffer with dual active-LOW OE controls for flexible bus switching
- ALS-logic family achieving propagation delays as low as 8 ns at 5 V supply
- ±24 mA output drive current supports direct bus loading across multiple TTL and CMOS loads
Applications
The SN74ALS541NS is widely used as a unidirectional data bus buffer between microprocessors and peripheral devices in 5 V TTL-compatible systems. Its 3-state outputs allow multiple drivers to share the same 8-bit data or address bus without contention. The device is also common in memory interface boards, industrial controllers, and legacy backplane designs where ALS-speed buffers with strong drive capability are required.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74ALS541NS:
Frequently Asked Questions
What propagation delay and drive current does the SN74ALS541NS deliver?
The SN74ALS541NS achieves a typical propagation delay of approximately 8 ns at a 5 V supply, making it fast enough for most 8-bit bus applications running at tens of megahertz. Its outputs can source and sink ±24 mA, which is sufficient to drive multiple TTL loads or CMOS inputs simultaneously without additional buffering stages.
How do the dual OE pins on the SN74ALS541NS enable safe bus sharing in a multi-master design?
The SN74ALS541NS has two independent active-LOW output-enable inputs (OE1 and OE2), both of which must be LOW to enable the 8 outputs. This dual-gate arrangement lets a system drive OE from two independent control signals, preventing simultaneous bus contention. When either OE is HIGH, all 8 outputs enter a high-impedance 3-state condition, effectively disconnecting the driver from the 8-bit bus.
In what package does the SN74ALS541NS ship, and what is the pin count?
The SN74ALS541NS comes in a 20-pin Small Outline (SOP-20 / SOIC-20) surface-mount package. The 20-pin count accommodates 8 input lines, 8 output lines, 2 output-enable control pins, VCC, and GND, providing a compact footprint that fits high-density PCB layouts typical of industrial and embedded bus interfaces.
When is SN74ALS541NS preferred over faster LVTTL or LVC buffers in a 5 V system?
SN74ALS541NS is preferred in legacy 5 V TTL systems where all signals swing from 0 V to 5 V and devices cannot tolerate 3.3 V logic thresholds common in LVC families. Its ALS inputs are directly compatible with 5 V TTL sources (VIH ≥ 2 V, VIL ≤ 0.8 V), eliminating level-shifting overhead. For new designs requiring 3-state buffering at 8 ns delays on a 5 V rail without voltage translation, ALS541 remains cost-effective.
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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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