Texas Instruments SN74LVTH541NSR

Overview

SN74LVTH541NSR from Texas Instruments is an octal buffer/driver IC designed for 3.3-V VCC operation with mixed-mode 5-V TTL interface capability, supporting bus driving and memory address register buffering. It features dual active-low 3-state enable inputs (OE1/OE2), bus-hold on all eight data inputs, and Ioff support for hot insertion. Typical propagation delay is 3.5 ns at VCC = 3.3 V, CL = 50 pF.

For engineers reviewing the SN74LVTH541NSR datasheet, SN74LVTH541NSR pinout, SN74LVTH541NSR application, or SN74LVTH541NSR equivalent, this page delivers verified electrical specs, SOP-20 package layout guidance, bus-hold behavior implications, and validated alternatives for 3.3-V/5-V level-shifting bus interface designs.

Technical Context

The SN74LVTH541NSR implements noninverting octal buffering with a 2-input AND gate control logic for 3-state outputs: both OE1 and OE2 must be low to enable Yn outputs. Its bus-hold circuitry actively maintains valid logic states on undriven A1–A8 inputs without external resistors, drawing ±500 µA max at VCC = 3.6 V.

Ioff protection disables outputs when VCC = 0 V, blocking current backflow during hot insertion; power-up 3-state ensures high-impedance outputs during VCC ramp from 0 to 1.5 V. Absolute input voltage tolerance reaches 7 V, enabling direct connection to 5-V systems while operating at 3.3-V VCC.

Key Specifications

Pinout & Package

SOP-20 (NS) package: 7.5 mm × 13.0 mm body, 1.27 mm lead pitch, 2.65 mm max height, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVTH541NSR, SN74LVC541APWR offers lower cost and power but sacrifices 5-V input tolerance and bus-hold; 74ALVCH162244DGGR doubles channel count yet requires external level translation and lacks Ioff - making SN74LVTH541NSR uniquely suited for robust 3.3-V-to-5-V bus bridging.

Availability

SN74LVTH541NSR is available at Aetrix Electronics and suitable for industrial control I/O expansion, memory address buffering, backplane bus interface, and test equipment signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVTH541NSR 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 expertise in high-reliability interface ICs and industrial-grade timing products.

The SN74LVTH541NSR belongs to TI's LVTH logic family, engineered specifically for mixed-voltage system interfacing - delivering 3.3-V core compatibility with 5-V bus interoperability, bus-hold stability, and hot-insertion safety in industrial and telecom infrastructure.

FAQ

What is the maximum input voltage the SN74LVTH541NSR can tolerate?

The SN74LVTH541NSR supports an input voltage range of −0.5 V to 7 V, independent of VCC. This allows direct connection to 5-V TTL buses while operating from a 3.3-V supply, eliminating external level-shifting components. The absolute maximum rating ensures robustness against transient overvoltage on A1–A8 and OE pins without damage or functional disruption.

Does the SN74LVTH541NSR require external pullup resistors on its inputs?

No. The SN74LVTH541NSR integrates bus-hold circuitry on all eight data inputs (A1–A8), actively maintaining the last valid logic state without external pullup or pulldown resistors. Using external resistors with enabled bus-hold is explicitly discouraged in the datasheet, as it may cause excessive current draw or logic instability.

How does the 3-state enable logic work on the SN74LVTH541NSR?

The SN74LVTH541NSR uses a 2-input AND gate with active-low enables: both OE1 and OE2 must be driven low to activate outputs Y1–Y8. If either OE1 or OE2 is high, all outputs enter high-impedance state. This dual-enable structure provides flexible bus arbitration and prevents accidental output assertion during power-up or control signal glitches.

Is the SN74LVTH541NSR suitable for hot-insertion applications?

Yes. The SN74LVTH541NSR incorporates Ioff and power-up 3-state circuitry specifically for hot-insertion. When VCC = 0 V, Ioff disables outputs to block damaging back-current; during VCC ramp (0–1.5 V), outputs remain in high-impedance state. These features are fully specified per JEDEC standards and validated for modular backplane and card-edge systems.

What package type and dimensions does the SN74LVTH541NSR use?

The SN74LVTH541NSR uses the SOP-20 (NS) package: 7.5 mm × 13.0 mm body size, 1.27 mm lead pitch, 2.65 mm maximum height, gull-wing leads, and RoHS-compliant NiPdAu surface finish. Its land pattern follows IPC-7351 recommendations with 0.6 mm pad width and 1.85 mm pad length for reliable reflow soldering.