Texas Instruments CD74ACT541EG4

Overview

CD74ACT541EG4 from Texas Instruments is a non-inverting octal 3-state buffer/line driver with dual active-low output enables, designed for high-speed bus interface and data routing in industrial and military-grade systems. It operates at 4.5–5.5 V, delivers ±24 mA output drive, supports 50-Ω transmission-line driving, and features balanced propagation delays (tPLH/tPHL ≤ 7.5 ns at 5 V, −40°C to +85°C).

For engineers reviewing the CD74ACT541EG4 datasheet, CD74ACT541EG4 pinout, CD74ACT541EG4 application, or CD74ACT541EG4 equivalent, this page provides verified functional mode truth tables, ACT-series electrical characteristics, thermal metrics (RθJA = 101.2°C/W for SOIC), 3-state leakage limits (±5 µA), and precise input loading values (0.5 unit load per data input).

Technical Context

The CD74ACT541EG4 implements TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max) and ACT-series CMOS logic, enabling direct interfacing with legacy TTL buses while maintaining low quiescent current (ICC ≤ 80 µA). Its dual OE pins allow independent control of two 4-bit groups, supporting segmented bus enable/disable.

Propagation delay symmetry (tPLH ≈ tPHL) and simultaneous switching noise mitigation (VOHV ≥ 4 V, VOLP ≤ 1 V at 5 V) are confirmed across −55°C to +125°C operation. The device uses RCA Advanced CMOS process with SCR-latchup resistance and meets ±2000-V HBM ESD rating.

Key Specifications

Pinout & Package

CD74ACT541EG4 is supplied in a 20-pin PDIP (Plastic Dual In-line Package) with body size 24.33 mm × 6.35 mm and full package size 24.33 mm × 9.4 mm. Pin 1 is located at the top-left corner when the notch faces upward.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT541N, CD74ACT541EG4 offers identical performance and form factor but differs in packaging date code and reel configuration (G4 suffix indicates tape-and-reel with specific MSL-1 handling); versus CD74AC541E, it delivers faster timing, tighter VOH/VOL margins, and guaranteed 5-V operation-making it optimal for deterministic high-speed bus interfaces.

Availability

CD74ACT541EG4 is available at Aetrix Electronics and suitable for industrial bus interface, military data acquisition, legacy system upgrade, and high-reliability memory expansion requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74ACT541EG4 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 over 90 years of innovation in high-reliability components.

The CD74ACT541EG4 belongs to TI's Advanced CMOS Logic family, engineered for robust 5-V digital interfacing in mission-critical systems where latch-up immunity, wide temperature operation, and precise timing are essential.

FAQ

What is the maximum operating temperature range for CD74ACT541EG4?

The CD74ACT541EG4 is rated for operation from −55°C to +125°C, qualified for extended industrial and military applications. This range is validated per the manufacturer's testing protocol and applies to the PDIP package variant (E suffix) used in CD74ACT541EG4. Thermal derating is not required within this span, and RθJA = 101.2°C/W reflects worst-case SOIC data-actual PDIP thermal resistance is lower but not published separately for this variant.

Does CD74ACT541EG4 support 3.3-V logic interfacing?

No, CD74ACT541EG4 does not support reliable 3.3-V operation. Its recommended supply range is strictly 4.5–5.5 V, and input thresholds (VIH = 2 V min, VIL = 0.8 V max) are optimized for 5-V TTL compatibility. Driving it from a 3.3-V microcontroller without level translation risks marginal VIH recognition and increased static power consumption due to partial device activation.

How many unit loads does each input of CD74ACT541EG4 present?

Each data input (D0–D7) of CD74ACT541EG4 presents 0.5 unit load, while each output enable input (!OE1, !OE2) presents 1.3 unit loads. This is specified in Table 4-1 "ACT Input Loading Table" and reduces capacitive loading on upstream drivers compared to standard TTL (1.0 unit load), improving fanout and signal integrity in dense bus architectures.

Can CD74ACT541EG4 drive 75-Ω transmission lines?

CD74ACT541EG4 is characterized for 50-Ω transmission-line driving at +85°C and 75-Ω at +125°C per Section 4.5 Note (2) and Section 4.6 Note (2). At elevated temperatures, its ±24 mA drive strength maintains adequate signal swing into 75-Ω loads, but at room temperature or lower, termination matching may require external series resistors to avoid overshoot.

What is the purpose of the dual output enables (!OE1 and !OE2) on CD74ACT541EG4?

The dual active-low output enables (!OE1 and !OE2) on CD74ACT541EG4 independently control two 4-bit output groups: !OE1 manages Q0–Q3, and !OE2 manages Q4–Q7. This allows segmented bus arbitration-for example, enabling upper/lower bytes of a data bus separately-reducing contention during memory-mapped I/O or supporting split-address decoding in legacy systems.