Diodes Incorporated 74LVC541AQ20-13

Overview

74LVC541AQ20-13 from Diodes Incorporated is an octal non-inverting 3-state buffer/line driver in a 20-pin V-QFN4525 package, operating from 1.65V to 3.6V supply, sinking/sourcing up to 24mA at V_CC = 3.0V, with 5.5V-tolerant inputs and IOFF partial-power-down protection. It is used for bus driving and memory address buffering in compact, mixed-voltage embedded systems.

For engineers reviewing the 74LVC541AQ20-13 datasheet, 74LVC541AQ20-13 pinout, 74LVC541AQ20-13 application, or 74LVC541AQ20-13 equivalent, key selection factors include its dual active-low output enable (OE1/OE2), Schmitt-trigger inputs for noise immunity, low propagation delay (≤6.5ns typ at 3.3V), and thermal resistance (θ_JA = 67°C/W) suited for space-constrained PCB layouts.

Technical Context

The device implements two independent 2-input AND gates for output enable control: either OE1 or OE2 high forces all eight outputs into high-impedance state. Its IOFF circuit blocks current backflow during power-down, meeting JESD78 Class I latch-up immunity (>250mA).

All inputs feature Schmitt-trigger action, enabling robust signal conditioning of slow or noisy waveforms. Output drive strength is specified across V_CC range (1.65–3.6V), with guaranteed VOL ≤0.80V and VOH ≥2.0V under full load at 3.0V, supporting reliable TTL- and CMOS-compatible interfacing.

Key Specifications

Pinout & Package

V-QFN4525-20 package: 2.5mm × 4.5mm × 0.95mm body, 0.50mm lead pitch, exposed thermal pad, JEDEC-compliant footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC541APWR and 74LVC541ADTR2G, the 74LVC541AQ20-13 delivers superior thermal performance (67°C/W vs. 74°C/W or >100°C/W) and smallest footprint (2.5×4.5mm), making it optimal for modern portable and automotive electronics where board area and junction temperature are critical constraints.

Availability

74LVC541AQ20-13 is available at Aetrix Electronics and suitable for PC memory subsystems, industrial PLC I/O expansion, and automotive infotainment display interfaces requiring stable component supply and long-term lifecycle support.

Supply support for 74LVC541AQ20-13 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, low-power, and mixed-signal solutions for industrial, computing, and automotive markets.

The 74LVC logic family targets low-voltage, high-speed digital interfacing with robust noise immunity and power-down safety-designed specifically for battery-powered and thermally constrained embedded systems.

FAQ

What is the maximum operating temperature for the 74LVC541AQ20-13?

The device is fully specified for operation from −40°C to +125°C ambient temperature. Junction temperature must remain below +150°C, which is ensured by its 67°C/W θ_JA and low ICC (≤40μA) under static conditions. Derating is required above 85°C ambient if driving 24mA continuously.

Can the 74LVC541AQ20-13 safely interface a 5V sensor output to a 1.8V microcontroller?

Yes-the inputs tolerate up to 5.5V regardless of V_CC, so a 5V sensor signal can directly drive A1–A8. However, outputs swing from GND to V_CC, so B1–B8 will only reach 1.8V when V_CC = 1.8V and cannot drive 5V-tolerant loads without external pull-ups or level shifters.

How does the dual output enable (OE1/OE2) function in practice?

OE1 and OE2 feed a 2-input AND gate: both must be low for outputs to be active. If either is high, all eight outputs go high-impedance. This allows hierarchical bus control-for example, OE1 from system controller and OE2 from local FPGA, enabling fail-safe isolation if either domain asserts disable.

Is the exposed thermal pad on the QFN package electrically connected?

No-the exposed pad is internally connected only to GND and serves solely for thermal conduction. It must be soldered to a solid GND plane on the PCB using at least 90% coverage and 4–6 thermal vias to maximize heat dissipation and meet the rated θ_JA of 67°C/W.