Texas Instruments SN74HCT541DWRG4

Overview

SN74HCT541DWRG4 from Texas Instruments is an octal non-inverting 3-state buffer/line driver IC operating at 4.5 V–5.5 V, delivering ±6 mA output drive per channel, 12 ns typical propagation delay (at 5.5 V, CL = 50 pF), and 80 µA max ICC. It interfaces directly with system buses or drives up to 15 LSTTL loads in industrial control backplanes and data acquisition subsystems.

For engineers reviewing the SN74HCT541DWRG4 datasheet, SN74HCT541DWRG4 pinout, SN74HCT541DWRG4 application, or SN74HCT541DWRG4 equivalent, key selection criteria include TTL-compatible inputs, dual 3-state enable (OE1/OE2) logic, data-flow-through SOIC-20 pinout, and guaranteed operation across –40°C to +85°C.

Technical Context

The SN74HCT541DWRG4 implements eight independent non-inverting buffers, each with true (non-inverted) output logic and high-impedance state controlled by a 2-input NOR gate formed by OE1 and OE2. All outputs enter high-Z when either OE1 or OE2 is high.

Its input structure is TTL-voltage compatible (VIH = 2 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), and its output stage supports rail-to-rail swing with VOH ≥ 3.7 V (at IOH = –6 mA, VCC = 4.5 V) and VOL ≤ 0.33 V (at IOL = 6 mA, VCC = 4.5 V).

Key Specifications

Pinout & Package

SN74HCT541DWRG4 is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm with standard 1.27 mm lead pitch and gull-wing leads. The package is RoHS-compliant, lead-finished with NiPdAu, and rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT240N and 74ACT541PC, SN74HCT541DWRG4 provides true (non-inverting) output logic with industry-standard HCT power/speed trade-off - making it optimal for bus isolation where signal polarity and low-static-power operation are prioritized over maximum speed or inversion flexibility.

Availability

SN74HCT541DWRG4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automated test equipment I/O modules, legacy bus extenders, and microcontroller peripheral expansion hubs requiring stable component supply and long-term manufacturability.

Supply support for SN74HCT541DWRG4 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 heritage in industry-standard logic families.

SN74HCT541DWRG4 belongs to TI's HCT logic series, designed specifically for TTL-compatible 5 V systems requiring low power, predictable timing, and robust noise immunity in industrial and instrumentation environments.

FAQ

What is the recommended bypass capacitor for SN74HCT541DWRG4?

A 0.1 µF ceramic capacitor is recommended for bypassing the VCC pin of SN74HCT541DWRG4, placed as close as possible to the pin. For enhanced noise suppression across frequencies, TI recommends paralleling this with a 1 µF capacitor - both must connect directly to the local ground plane with minimal trace length to maintain signal integrity and reduce switching noise.

Can SN74HCT541DWRG4 operate at 3.3 V?

No, SN74HCT541DWRG4 is not specified for 3.3 V operation. Its recommended operating range is strictly 4.5 V to 5.5 V, and its TTL-compatible inputs require VIH ≥ 2 V - which falls outside safe margins at 3.3 V. Using SN74HCT541DWRG4 below 4.5 V risks undefined output states, increased propagation delay, and potential functional failure.

How should unused inputs be handled on SN74HCT541DWRG4?

All unused inputs on SN74HCT541DWRG4 - including A1–A8, OE1, and OE2 - must be tied to either VCC or GND. Floating inputs cause undefined internal node voltages, leading to excessive ICC, oscillation, or erroneous 3-state behavior. TI explicitly mandates this in Section 5.2 of the datasheet to ensure stable device operation and prevent EMI generation.

What is the thermal resistance (RθJA) of SN74HCT541DWRG4 in its SOIC package?

The junction-to-ambient thermal resistance (RθJA) for SN74HCT541DWRG4 in the SOIC (DW) package is 109.1 °C/W, as updated in Revision E (May 2022) of the datasheet. This value assumes standard JEDEC 2-layer board conditions (1-inch² copper pad, 2 oz Cu). Actual thermal performance depends on PCB layout, copper area, and airflow - derating is required above 70°C ambient.

Does SN74HCT541DWRG4 support hot-swapping on a live bus?

SN74HCT541DWRG4 supports controlled hot-swap operation when used with proper system-level design: OE1 and OE2 must be held low during insertion to keep outputs in high-Z until power stabilizes, and VCC must ramp cleanly before enabling. However, the device itself has no built-in hot-swap protection (e.g., slew-rate limiting or current limiting), so external circuitry is required for full compliance with hot-swap standards.