Texas Instruments SN74AC541DGSR

Overview

SN74AC541 from Texas Instruments is an octal 3-state buffer IC designed for bidirectional signal buffering and bus isolation in digital systems. It features dual active-low output enable inputs (OE1, OE2), operates across 1.5 V to 6 V supply range, delivers ±24 mA continuous output drive at 5 V, achieves 6 ns max propagation delay (tpd) under 5 V/50 pF load, and drives 50-Ω transmission lines - enabling use in high-speed data routing and microcontroller peripheral interfacing.

For engineers reviewing the SN74AC541 datasheet, SN74AC541 pinout, SN74AC541 application, or SN74AC541 equivalent, this page provides verified functional identity, validated pin mapping for DGS (VSSOP-20) package, confirmed switching and drive specifications, real-world application context for bus hold and signal redriving, and two technically documented alternative parts with explicit functional and application differences.

Technical Context

The SN74AC541 implements eight independent CMOS buffer channels with fully balanced push-pull outputs capable of sourcing and sinking equal current (±24 mA continuous at 5 V). Its dual active-low output enables (OE1/OE2) require both to be low for output activation, supporting robust bus arbitration control.

It uses standard CMOS input structure with 9 pF typical input capacitance and supports wide-voltage logic level translation: inputs tolerate up to 6 V regardless of VCC, and output voltage levels track VCC (VOH ≥ VCC − 0.5 V, VOL ≤ 0.1 V at 24 mA), enabling interoperability across mixed-supply domains.

Key Specifications

Pinout & Package

DGS package is a 20-pin Very Thin Shrink Small-Outline Package (VSSOP) with 0.5 mm pitch, 5.1 mm × 4.9 mm footprint, and thermal pad not present. Pin numbering follows standard JEDEC top-view convention.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Compared with SN74AC541, SN74LVC541APWR trades voltage range and input tolerance for lower static power and smaller die size, while 74AC541SCX offers identical electrical behavior and pin compatibility as a direct second-source option - making SN74AC541 optimal for designs requiring 1.5–6 V operation and 6 V-tolerant inputs.

Availability

SN74AC541 is available at Aetrix Electronics and suitable for industrial control backplanes, automotive body electronics modules, and test equipment signal routing requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for SN74AC541 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of experience in high-reliability interface and signal conditioning ICs.

The SN74AC541 belongs to TI's AC logic family - engineered for high-speed, low-power, wide-voltage operation in industrial and automotive applications where robustness and interoperability across logic families are critical.

FAQ

What is the maximum operating supply voltage for the SN74AC541?

The SN74AC541 supports a recommended operating supply voltage range of 1.5 V to 6 V. Its absolute maximum rating is 7 V, but sustained operation above 6 V risks permanent damage. At 6 V, it maintains full 3-state functionality, ±24 mA drive capability, and meets all AC timing specifications including 6 ns max tpd - making SN74AC541 suitable for legacy 5 V systems and emerging wide-range industrial rails.

Does the SN74AC541 support level-shifting between different logic families?

Yes, the SN74AC541 supports bidirectional level-shifting: its inputs tolerate up to 6 V regardless of VCC, allowing 5 V signals to safely drive a 3.3 V-powered SN74AC541; its outputs swing rail-to-rail (VOH ≈ VCC, VOL ≈ 0 V), so a 3.3 V-powered SN74AC541 can drive 5 V-tolerant inputs. This eliminates external level translators in mixed-supply systems - a core design value of the SN74AC541.

How do the dual output enable pins (OE1 and OE2) function on the SN74AC541?

On the SN74AC541, both OE1 and OE2 must be driven LOW simultaneously to enable all eight outputs; if either is HIGH, all outputs enter high-impedance state. This AND-gated enable logic provides fail-safe bus isolation - for example, tying OE1 to system reset and OE2 to processor control ensures outputs remain disabled unless both conditions are met, preventing glitches during boot or fault recovery.

Can the SN74AC541 drive a 50-Ω transmission line directly?

Yes, the SN74AC541 is explicitly characterized to drive 50-Ω transmission lines, with verified performance at 5 V including 6 ns tpd and clean edge integrity. Its ±24 mA continuous drive strength matches typical 50-Ω line termination requirements, and its fast edge rates (sub-2 ns rise/fall at light loads) are manageable with proper layout - confirming SN74AC541 as a purpose-fit redriver for point-to-point digital interconnects.

What is the thermal performance of the SN74AC541 in the DGS (VSSOP-20) package?

In the DGS package, the SN74AC541 has a junction-to-ambient thermal resistance (RθJA) of 125.5°C/W. At maximum rated 24 mA per channel (192 mA total) and 5 V supply, worst-case power dissipation remains below 150 mW - resulting in <20°C junction rise above ambient, well within the 125°C max rating. This confirms SN74AC541's suitability for compact, sealed industrial enclosures without forced airflow.