STMicroelectronics 74ACT541MTR

Overview

74ACT541MTR from STMicroelectronics is an advanced high-speed CMOS octal bus buffer with non-inverting 3-state outputs, designed for bidirectional data bus interfacing between TTL, NMOS, and CMOS systems. It features 4 ns typical propagation delay at 5 V, ±24 mA symmetrical output drive, 4.5–5.5 V operating range, and 2 kV ESD immunity on all I/O pins - deployed in industrial backplane and memory address buffering applications.

For engineers reviewing the 74ACT541MTR datasheet, 74ACT541MTR pinout, 74ACT541MTR application, or 74ACT541MTR equivalent, key selection criteria include transmission-line driving capability (50 Ω), balanced tPLH/tPHL delays, input compatibility with TTL logic thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and TSSOP-20 package suitability for high-density PCB layouts.

Technical Context

The device implements dual active-low enable inputs (G1, G2) wired as a two-input AND gate to control all eight outputs simultaneously into high-impedance state. Its sub-micron C2MOS process enables low ICC (4 µA max at 25°C) while sustaining rail-to-rail output swing and symmetrical |IOH| = |IOL| = 24 mA (min) drive strength.

Input and output pins are arranged on opposite sides of the TSSOP-20 package to simplify PCB routing. All I/Os integrate protection diodes for ±20 mA DC current handling and transient suppression, meeting 2 kV HBM ESD immunity per JEDEC JS-001.

Key Specifications

Pinout & Package

TSSOP-20 package: 6.5 mm × 4.4 mm body, 0.65 mm pitch, 1.1 mm height, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT541PW, 74ACT541MTR offers identical performance and footprint but differs in manufacturer-specific ESD structure and thermal resistance. Versus 74LCX541MTCX, it delivers faster timing and higher drive at 5 V, making it optimal for legacy 5 V industrial designs requiring strict timing margins.

Availability

74ACT541MTR is available at Aetrix Electronics and suitable for industrial backplane buffering, memory address latching, automated test fixture interface, and high-speed signal routing requiring stable component supply across extended temperature ranges (–55°C to +125°C).

Supply support for 74ACT541MTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The 74ACT high-speed CMOS logic family targets robust 5 V digital interfacing with enhanced noise immunity, ESD tolerance, and transmission-line drive - optimized for industrial control, instrumentation, and legacy system upgrades.

FAQ

What is the maximum operating temperature range for the 74ACT541MTR?

The 74ACT541MTR is rated for continuous operation from –55°C to +125°C, validated per its Recommended Operating Conditions table. This extended range supports deployment in harsh environments such as industrial motor controls and outdoor telecom equipment without derating.

Can the 74ACT541MTR drive a 50 Ω transmission line directly?

Yes - the device guarantees ±24 mA output drive capability into loads down to 50 Ω, verified by incident-wave switching tests per AC Electrical Characteristics. No external series termination resistor is needed for point-to-point 50 Ω traces up to 15 cm on FR-4.

How does the dual-enable logic (G1/G2) function?

G1 and G2 act as active-low inputs wired internally as an AND gate: only when both are low do outputs Y1–Y8 become active. If either is high, all outputs enter high-impedance state - enabling flexible bus arbitration using independent control signals.

Is the 74ACT541MTR pin-compatible with standard 74LS541 devices?

Yes - it maintains identical pinout and logic function with 74LS541, including input thresholds, output polarity, and 3-state behavior. However, it operates at higher speed (4 ns vs. ~15 ns), lower ICC, and requires 4.5–5.5 V supply instead of 5 V ±5%.