STMicroelectronics 74VHC541MTR

Overview

74VHC541MTR from STMicroelectronics is an advanced high-speed CMOS octal bus buffer with non-inverting 3-state outputs, designed for bidirectional data bus interfacing between 5V and 3V systems. It features 3.5 ns typical propagation delay at 5V, ±8 mA symmetrical output drive, 2V–5.5V operating voltage, and input tolerance up to 7V independent of VCC.

For engineers reviewing the 74VHC541MTR datasheet, 74VHC541MTR pinout, 74VHC541MTR application, or 74VHC541MTR equivalent, key selection criteria include 3-state enable logic (dual active-high G1/G2), ESD immunity (2 kV), power-down input protection, and SO-20 package compatibility with legacy 74-series layouts.

Technical Context

The device implements dual-input AND-gated 3-state control: either G1 or G2 high forces all eight Y outputs into high-impedance mode. Inputs accept 0–7V regardless of VCC, enabling robust level-shifting without external biasing.

Its sub-micron C2MOS process delivers balanced tPLH ≅ tPHL propagation delays, low dynamic noise (VOLP ≤ 0.9V), and latch-up immunity exceeding standard CMOS. All I/O pins integrate diode-based ESD protection rated to 2 kV per HBM.

Key Specifications

Pinout & Package

74VHC541MTR is housed in a 20-pin SOIC (SO-20) package with 1.27 mm pitch, JEDEC MS-013 compliant, tape-and-reel packaged (MTR suffix). Pin layout places inputs (A1–A8, G1, G2) on left side and outputs (Y1–Y8) on right side to simplify PCB routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC541APWR and 74HC541D,653, the 74VHC541MTR uniquely combines 5V bus compatibility, 7V input tolerance, and 3.5 ns speed-making it the only choice for reliable 5V↔3V bridging in thermally demanding or hot-pluggable systems.

Availability

74VHC541MTR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, automated test equipment I/O cards, and medical diagnostic data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74VHC541MTR 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, Switzerland, specializing in automotive, industrial, and power management ICs with vertical manufacturing and broad IP portfolio.

The 74VHC series targets high-speed, low-power logic interfacing in mixed-voltage embedded systems, emphasizing robustness, pin compatibility, and extended temperature operation for mission-critical industrial and automotive applications.

FAQ

What is the logic behavior of the G1 and G2 enable inputs?

G1 and G2 form an OR function: if either input is high, all eight Y outputs enter high-impedance state. Both must be low for data to pass from A1–A8 to Y1–Y8. This dual-enable structure allows flexible bus arbitration-e.g., one gate controlled by CPU, the other by DMA controller.

Can 74VHC541MTR safely interface a 3.3V FPGA to a 5V DAC without level shifters?

Yes. Its inputs tolerate 0–7V regardless of VCC, and outputs swing rail-to-rail within VCC limits. With VCC = 3.3V, Yn outputs drive 0–3.3V (safe for 5V-tolerant DAC inputs), while A1–A8 accept 0–5V FPGA outputs directly-no external components needed.

Does the 74VHC541MTR support hot-swap insertion when VCC is unpowered?

Yes. Power-down protection ensures inputs remain safe at 0–7V even with VCC = 0 V. No reverse current flows, and internal protection diodes clamp input energy-preventing damage or system upset during live insertion into powered backplanes.

How does its 2 kV ESD rating impact PCB layout in noisy industrial environments?

The 2 kV HBM rating reflects integrated on-die protection diodes on every pin. This reduces need for external TVS devices on I/O traces, simplifying layout and lowering BOM count-especially valuable in space-constrained PLC I/O modules exposed to relay coil transients and motor drive noise.