STMicroelectronics 74LVX541TTR

Overview

74LVX541TTR from STMicroelectronics is a low-voltage CMOS octal bus buffer with 3-state non-inverting outputs, 5V-tolerant inputs, and symmetrical output drive (±4 mA). It operates from 2.0 V to 3.6 V, delivers 5.0 ns typical propagation delay at 3.3 V, and supports level-shifting between 3.3 V and 5 V systems in industrial I/O expansion.

For engineers reviewing the 74LVX541TTR datasheet, 74LVX541TTR pinout, 74LVX541TTR application, or 74LVX541TTR equivalent, key selection criteria include 5V input tolerance, 3.3V-compatible 3-state control logic, low ICC (4 µA max), high noise immunity (VOLP = 0.3 V typ), and TSSOP-20 package compatibility with space-constrained PCB layouts.

Technical Context

The device implements dual active-low 3-state enable inputs (G1, G2) wired as an AND gate: either input high forces all eight Y outputs into high-impedance. Its sub-micron C2MOS process enables true 3.3 V operation while accepting 0–5.5 V input signals independent of VCC.

Input protection includes 2 kV ESD immunity and diode clamping that allows safe 0–7 V input voltage regardless of supply state. Output impedance is balanced (|IOH| = IOL ≥ 4 mA at VCC = 3 V), ensuring matched rise/fall times and minimizing ground bounce in multi-load bus environments.

Key Specifications

Pinout & Package

TSSOP-20 package: 6.5 mm × 4.4 mm body, 0.65 mm pitch, thin profile (1.2 mm max 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 74LVC541APW and SN74LVTH541PW, the 74LVX541TTR uniquely balances 5 V input tolerance, ultra-low ICC, and sub-6 ns timing-making it optimal for mixed-voltage, power-sensitive embedded interfaces where external protection is prohibited.

Availability

74LVX541TTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, embedded microcontroller bus interface, and automotive body control module designs requiring stable component supply across extended temperature ranges (–55 °C to +125 °C).

Supply support for 74LVX541TTR 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 capability.

The 74LVX series targets low-voltage, low-power 3.3 V logic interoperability-designed specifically for battery-powered, noise-sensitive, and mixed-supply embedded systems needing robust 5 V tolerant interfacing.

FAQ

Can 74LVX541TTR operate with VCC = 2.0 V and still accept 5 V inputs?

Yes. The device guarantees 5 V input tolerance across its full operating VCC range (2.0 V to 3.6 V), including at minimum VCC. Input protection circuitry clamps excess voltage internally, allowing safe 0–5.5 V signals regardless of supply level-critical for hot-swap or brown-out scenarios.

What is the maximum capacitive load this buffer can drive while maintaining 5 ns propagation delay?

At VCC = 3.3 V and CL = 15 pF, tPD is guaranteed at 5.0–8.5 ns (min–max). With 50 pF load, tPD increases to 7.5–12.0 ns. For strict ≤5 ns timing, total net capacitance-including PCB trace, probe, and downstream inputs-must stay ≤15 pF.

How does the dual-enable (G1/G2) logic affect PCB layout compared to single-enable buffers?

The AND-gated dual-enable allows independent control of buffer groups via separate FPGA GPIOs or microcontroller pins, enabling fine-grained power gating. Layout benefits include reduced routing congestion-G1/G2 placed on opposite package edges-and elimination of external logic gates needed for OR-based enable schemes.

Is thermal derating required when operating at 125 °C ambient?

No additional derating is required beyond datasheet limits. At TA = 125 °C, ICC remains ≤40 µA (vs. 4 µA at 25 °C), and output drive stays ≥4 mA. The C2MOS process ensures stable parametric performance across –55 °C to +125 °C, validated per JEDEC JESD22-A108.