Texas Instruments SN74LVTH541DB

Overview

SN74LVTH541DB from Texas Instruments is an octal buffer/driver IC designed for 3.3-V VCC operation with TTL-compatible 5-V input/output signaling. It features dual active-low 3-state enable inputs (OE1, OE2), bus-hold on all eight data inputs (A1–A8), and supports mixed-mode voltage interfaces between 3.3-V logic and 5-V systems. It is used in memory address buffering and bus line driving applications where hot-insertion and undriven input stability are required.

For engineers reviewing the SN74LVTH541DB datasheet, SN74LVTH541DB pinout, SN74LVTH541DB application, or SN74LVTH541DB equivalent, key selection criteria include its 2.7–3.6-V supply range, ±100 µA Ioff at VCC = 0 V, 3.5 ns typical propagation delay (VCC = 3.3 V), bus-hold current capability (±500 µA), and SSOP-20 package thermal impedance of 70°C/W.

Technical Context

The SN74LVTH541DB implements a noninverting octal buffer architecture with dual 2-input AND-gated 3-state control (OE1 and OE2 active-low). Its bus-hold circuitry actively maintains valid logic states on un-driven A1–A8 inputs without external resistors, eliminating floating node risks in high-density PCB layouts.

It supports hot insertion via Ioff and power-up 3-state functionality: outputs enter high-impedance state when VCC is below 1.5 V or during power transitions, preventing backdrive current and bus contention. Absolute maximum ratings include −0.5 V to 4.6 V supply voltage and −0.5 V to 7 V input/output voltage tolerance under clamp-current limits.

Key Specifications

Pinout & Package

SN74LVTH541DB uses a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, 7.4 mm × 5.0 mm body size, and maximum 2.0 mm height per JEDEC MO-150. Pin 1 index is marked by a beveled corner and located at top-left when viewed top-side with marking "LXH541".

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVTH541DB, SN74LVC541APW offers lower static power but sacrifices 5-V input tolerance and bus-hold, while 74ALVC541MTCX improves speed yet removes mixed-mode capability - making SN74LVTH541DB uniquely suited for legacy bus upgrades and hot-plug embedded modules.

Availability

SN74LVTH541DB is available at Aetrix Electronics and suitable for memory address buffering, industrial bus interface, hot-swappable backplane modules, and low-power embedded peripheral interface applications requiring stable component supply across extended temperature ranges (−40°C to 85°C).

Supply support for SN74LVTH541DB 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 connectivity technologies with over 50 years of innovation in logic and interface solutions.

The SN74LVTH541DB belongs to TI's LVTH (Low-Voltage BiCMOS) logic family, engineered for seamless interoperability between 3.3-V logic domains and legacy 5-V systems in industrial, telecom, and computing infrastructure.

FAQ

What is the function of OE1 and OE2 on the SN74LVTH541DB?

OE1 and OE2 are active-low 3-state enable inputs wired to a 2-input AND gate. When either is high, all eight Y outputs enter high-impedance state. Both must be low for normal noninverting buffer operation. This dual-enable structure allows flexible bus arbitration and supports daisy-chained enable schemes in multi-device systems using SN74LVTH541DB.

Does the SN74LVTH541DB require external pull-up or pull-down resistors on its inputs?

No. The SN74LVTH541DB integrates bus-hold circuitry on all eight A1–A8 inputs, which actively maintains the last-valid logic state without external components. Using pull-up or pull-down resistors with SN74LVTH541DB is explicitly discouraged in the datasheet, as it may interfere with bus-hold current compliance and cause unpredictable logic behavior.

Can the SN74LVTH541DB operate with a 2.5-V supply?

No. The recommended minimum VCC for SN74LVTH541DB is 2.7 V per the datasheet's recommended operating conditions. Operation below 2.7 V is not characterized and may result in degraded noise margins, increased propagation delay, or failure to meet bus-hold or Ioff specifications. For 2.5-V systems, consider SN74LVC541A instead - though it lacks 5-V input tolerance.

What is the thermal resistance (θJA) of the SN74LVTH541DB in its SSOP package?

The SN74LVTH541DB in the SSOP-20 (DB) package has a junction-to-ambient thermal resistance (θJA) of 70°C/W, measured per JESD 51-7. This value assumes standard JEDEC 2S2P test board conditions and is critical for calculating maximum allowable power dissipation (e.g., 320 mW at 25°C ambient) before exceeding the 125°C maximum junction temperature.

Is the SN74LVTH541DB compatible with 5-V CMOS logic inputs?

Yes. The SN74LVTH541DB accepts input voltages up to 5.5 V on A1–A8 and OE1/OE2 pins while operating from a 3.3-V VCC, satisfying TTL input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and supporting direct connection to 5-V CMOS outputs. Its 5-V-tolerant inputs eliminate external level-shifting circuitry when interfacing with legacy 5-V logic families.