Texas Instruments SN74LVC541ADBRG4

Overview

SN74LVC541ADBRG4 from Texas Instruments is an octal non-inverting buffer with 3-state outputs, designed for bus interface and signal redriving in 1.65V–3.6V systems. It features dual active-low output enables (OE1/OE2), 5.1ns max propagation delay at 3.3V, 5.5V-tolerant inputs, and Ioff support for live insertion. Used in digital signal integrity enhancement on PCBs with long traces or capacitive loads.

For engineers reviewing the SN74LVC541ADBRG4 datasheet, SN74LVC541ADBRG4 pinout, SN74LVC541ADBRG4 application, or SN74LVC541ADBRG4 equivalent, key selection criteria include 3-state drive capability, mixed-voltage interoperability (5V input into 3.3V VCC), thermal performance in TSSOP-20, and compatibility with high-speed digital buses requiring controlled enable sequencing.

Technical Context

The SN74LVC541ADBRG4 implements eight independent CMOS buffer channels sharing two synchronized active-low output enable inputs (OE1 and OE2), both of which must be low to activate outputs-enabling fail-safe 3-state control. Its balanced push-pull outputs deliver ±24mA drive at 3.0V VCC while maintaining rail-to-rail VOH/VOL compliance across 1.65V–3.6V supply range.

It supports partial-power-down via Ioff circuitry that disables all outputs when VCC = 0V, limiting leakage to ±10μA. Input tolerance up to 5.5V allows direct interfacing with 5V logic without level shifters, and its 4pF typical input capacitance minimizes loading on upstream drivers.

Key Specifications

Pinout & Package

TSSOP-20 package (PW), 6.5mm × 6.4mm body size, 0.65mm pitch, exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC244APWR and 74LVC541APW,118, the SN74LVC541ADBRG4 uniquely enforces strict dual-OE coordination for fail-safe bus release, offers superior 5.5V input tolerance margin, and delivers tighter propagation delay consistency across all eight channels.

Availability

SN74LVC541ADBRG4 is available at Aetrix Electronics and suitable for industrial automation interfaces, automotive body control modules, and embedded computing backplanes requiring stable component supply and long-term manufacturability.

Supply support for SN74LVC541ADBRG4 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 logic IC design and manufacturing.

The SN74LVC541ADBRG4 belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for interoperability across mixed-voltage digital systems and optimized for signal integrity in space-constrained PCB layouts.

FAQ

What is the function of the dual output enable pins (OE1 and OE2) on the SN74LVC541ADBRG4?

The SN74LVC541ADBRG4 requires both OE1 (Pin 1) and OE2 (Pin 19) to be driven low simultaneously to activate all eight buffer outputs. This dual-enable architecture prevents unintended bus activity during power-up, reset, or partial enable conditions. When either OE is high, all Y1–Y8 outputs enter high-impedance state - a safety feature critical for multi-master bus arbitration and hot-swap systems. The SN74LVC541ADBRG4 does not support single-OE operation.

Can the SN74LVC541ADBRG4 safely interface a 5V microcontroller output with a 3.3V FPGA input?

Yes. The SN74LVC541ADBRG4 accepts input voltages up to 5.5V regardless of VCC level, making it ideal for 5V-to-3.3V translation without external components. With VCC = 3.3V, its outputs swing rail-to-rail (VOH ≥ 3.1V, VOL ≤ 0.2V), fully meeting FPGA input thresholds. The SN74LVC541ADBRG4 achieves this via robust input clamp diodes and level-shifted internal logic - verified across –40°C to +125°C.

What is the maximum capacitive load the SN74LVC541ADBRG4 can drive while maintaining specified timing?

The SN74LVC541ADBRG4 is characterized for loads ≤50pF in its switching specifications - including trace capacitance, receiver input capacitance, and probe/jig effects. At 3.3V VCC and 25°C, it sustains 5.1ns max tpd into 50pF. Exceeding this load increases propagation delay nonlinearly and may cause ringing or undershoot. For heavier loads, add series damping (e.g., 22Ω–33Ω) near the output - a practice validated in the SN74LVC541ADBRG4 application schematics.

Does the SN74LVC541ADBRG4 support partial power-down, and how is it implemented?

Yes. The SN74LVC541ADBRG4 integrates Ioff circuitry that disables all outputs when VCC = 0V, limiting Ioff leakage to ±10μA per pin. This protects downstream circuitry from back-driving and enables safe live insertion in modular backplanes. The SN74LVC541ADBRG4 maintains this behavior across its full operating temperature range and is explicitly tested per JESD78 latch-up standards (>100mA).

What package type and thermal characteristics apply to the SN74LVC541ADBRG4?

The SN74LVC541ADBRG4 uses a 20-pin TSSOP (PW) package with 6.5mm × 6.4mm body size and 0.65mm pitch. Its thermal resistance is RθJA = 120.3°C/W (JEDEC standard board), RθJC(top) = 62.5°C/W, and RθJB = 82.4°C/W. The package includes an exposed thermal pad that may be left floating or connected to GND - no internal electrical connection exists. These values are measured per JEDEC JESD51 standards and published in TI's official thermal metrics report.