Texas Instruments SN74LVC541ADB

Overview

SN74LVC541ADB from ON Semiconductor is a low-voltage CMOS octal non-inverting buffer with 3-state outputs, operating from 1.2 V to 3.6 V supply. It features 5 V-tolerant inputs/outputs (up to 5.5 V), 24 mA output drive capability, and flow-through pinout for memory address driving and TTL-level bus transceiver applications.

For engineers reviewing the SN74LVC541ADB datasheet, SN74LVC541ADB pinout, SN74LVC541ADB application, or SN74LVC541ADB equivalent, key selection criteria include 5 V tolerance, dual output enable control (OE1/OE2), high-impedance TTL-compatible inputs, near-zero static ICC in all logic states, and SOIC-20 WB package compatibility.

Technical Context

The SN74LVC541ADB implements a flow-through architecture with eight independent non-inverting data paths (D0–D7 → O0–O7), each controlled by two active-low output enable inputs (OE1, OE2). Outputs enter high-impedance state when either OE1 or OE2 is HIGH, enabling bidirectional bus control without external logic.

Its IOFF specification guarantees high-impedance outputs when VCC = 0 V, supporting live insertion and withdrawal. Input leakage current is ≤ ±0.1 µA at VCC = 3.6 V, and propagation delay ranges from 1.0 ns (VCC = 3.0–3.6 V) to 14.0 ns (VCC = 1.2 V), ensuring timing predictability across voltage scaling.

Key Specifications

Pinout & Package

SN74LVC541ADB is housed in a 20-pin SOIC Wide Body (SOIC-20 WB, Case 751D) package with standard 0.300-inch body width and 1.27 mm pitch. Pin 1 is marked with a notch or dot; pin numbering follows counter-clockwise sequence from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC541ADB, SN74LVC244APW offers identical performance in smaller TSSOP-20 but requires layout revision, while MC74LCX244DT omits critical IOFF and 5 V tolerance-making SN74LVC541ADB the only choice for robust hot-swap and mixed-voltage designs.

Availability

SN74LVC541ADB is available at Aetrix Electronics and suitable for memory address driving, TTL-level bus transceiver, and hot-swappable module interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for SN74LVC541ADB 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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, logic, and discrete components for automotive, industrial, and computing markets.

The SN74LVC541ADB belongs to the LVC logic family, designed specifically for low-voltage, high-speed digital interfacing in mixed-voltage systems where 5 V tolerance, low power, and robustness against partial power-down are essential.

FAQ

What is the maximum input voltage rating for SN74LVC541ADB?

The SN74LVC541ADB supports DC input voltages from −0.5 V to +5.5 V, regardless of VCC level. This 5 V tolerance allows direct connection to 5 V TTL outputs without risk of damage or latch-up, even when VCC is as low as 1.2 V. The absolute maximum rating is verified per JEDEC JESD78 latch-up testing at ±250 mA.

Does SN74LVC541ADB support hot-plug operation?

Yes, SN74LVC541ADB supports live insertion and withdrawal thanks to its IOFF specification, which guarantees high-impedance outputs when VCC = 0 V. This prevents current backflow from powered I/O lines into an unpowered device, protecting both the SN74LVC541ADB and upstream/downstream circuitry during hot-swap events.

What is the output drive capability of SN74LVC541ADB at 3.3 V supply?

At VCC = 3.3 V, SN74LVC541ADB delivers ±24 mA output current per pin - 24 mA sink (IOL) and 24 mA source (IOH). This meets or exceeds standard LVTTL drive requirements and enables direct termination of 50 Ω transmission lines or fan-out to ≥10 LVTTL loads without external amplification.

How does the dual output enable (OE1/OE2) function in SN74LVC541ADB?

In SN74LVC541ADB, either OE1 or OE2 being HIGH places all eight outputs (O0–O7) into high-impedance state. Both must be LOW to enable all buffers. This OR logic simplifies bus arbitration design - for example, one OE can be tied to system reset while the other connects to a directional control signal.

Is SN74LVC541ADB compatible with 1.8 V microcontrollers?

Yes, SN74LVC541ADB operates down to VCC = 1.2 V and accepts 1.8 V logic inputs as valid HIGH levels (VIH = 0.65 × VCC minimum). At VCC = 1.8 V, VIH threshold is 1.17 V, comfortably exceeded by typical 1.8 V MCU outputs (~1.6–1.8 V), ensuring reliable interfacing without level-shifting circuitry.