Texas Instruments SN74LV541AQWRKSRQ1

Overview

SN74LV541AQWRKSRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive octal noninverting buffer/driver with 3-state outputs, operating from 2 V to 5.5 V, delivering 6 ns max propagation delay at 5 V, supporting mixed-mode voltage operation, and featuring Ioff partial-power-down protection for safe bus isolation.

For engineers reviewing the SN74LV541AQWRKSRQ1 datasheet, SN74LV541AQWRKSRQ1 pinout, SN74LV541AQWRKSRQ1 application, or SN74LV541AQWRKSRQ1 equivalent, key selection criteria include dual active-low output enable (OE1/OE2) logic requiring both low for output activation, wettable-flank QFN-20 packaging for AOI-compatible solder joint inspection, and guaranteed operation across –40°C to +125°C ambient temperature.

Technical Context

The SN74LV541AQWRKSRQ1 implements eight independent noninverting CMOS buffers sharing two synchronized active-low output enable inputs (OE1 and OE2), where both must be asserted low to activate all outputs-preventing unintended bus contention during power sequencing or reset. Its balanced push-pull outputs drive high or low actively when enabled and enter true high-impedance state when disabled.

It integrates Ioff circuitry that disables all outputs and limits input/output leakage to ≤5 µA when VCC = 0 V, enabling hot-insertion and back-drive protection in partial-power-down systems. The device supports mixed-voltage interfacing: inputs tolerate up to 5.5 V regardless of VCC, and outputs swing rail-to-rail within the applied VCC range (2 V–5.5 V).

Key Specifications

Pinout & Package

SN74LV541AQWRKSRQ1 is packaged in a 20-pin wettable-flank QFN (WRKS), 4.50 mm × 2.50 mm body, with exposed thermal pad (connected to GND or left floating). Wettable flanks support automated optical inspection (AOI) of side-solder fillets for automotive-grade manufacturing traceability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV541AQWRKSRQ1, SN74LVC541AQPWRQ1 offers lower-voltage flexibility at minor speed cost, while MC74VHC541DTG provides pin-compatible functionality without automotive qualification-making SN74LV541AQWRKSRQ1 the sole choice for production automotive systems requiring AOI-verifiable wettable-flank QFN packaging and full AEC-Q100 compliance.

Availability

SN74LV541AQWRKSRQ1 is available at Aetrix Electronics and suitable for automotive body control modules, ADAS sensor interfaces, infotainment display expansion, and powertrain ECU reset hold circuits requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant traceability.

Supply support for SN74LV541AQWRKSRQ1 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 automotive ICs, with decades of experience delivering high-reliability components for safety-critical systems.

The SN74LV541AQWRKSRQ1 belongs to TI's automotive-qualified LV family of low-voltage logic devices, designed specifically for robust signal buffering and bus isolation in harsh-temperature automotive environments where timing predictability and power-down safety are mandatory.

FAQ

What is the function of the dual OE inputs (OE1 and OE2) on the SN74LV541AQWRKSRQ1?

The SN74LV541AQWRKSRQ1 requires both OE1 and OE2 to be driven low simultaneously to enable all eight buffer outputs. This dual-control architecture prevents accidental bus activation during power sequencing or partial resets. When either OE is high, all Y1–Y8 outputs enter high-impedance state-ensuring clean signal isolation in automotive multiplexed networks. This behavior is explicitly defined in the device's function table and verified across its full operating temperature range.

Does the SN74LV541AQWRKSRQ1 support hot-swap or partial-power-down operation?

Yes, the SN74LV541AQWRKSRQ1 includes dedicated Ioff circuitry that disables all outputs and limits input/output leakage to ≤5 µA when VCC = 0 V. This feature enables safe insertion into live backplanes and prevents damaging back-current flow during MCU sleep modes or power domain shutdowns. The Ioff specification is tested and guaranteed per AEC-Q100 requirements, making SN74LV541AQWRKSRQ1 suitable for automotive systems with dynamic power management.

What is the significance of the "WRKS" package designation for the SN74LV541AQWRKSRQ1?

WRKS denotes a 20-pin wettable-flank QFN package (4.50 mm × 2.50 mm) used exclusively for the SN74LV541AQWRKSRQ1. Its side-wettable leads enable reliable automated optical inspection (AOI) of solder fillets-mandatory for zero-defect automotive manufacturing. Unlike standard QFNs, the WRKS variant features modified lead geometry that promotes visible side-solder meniscus formation, directly supporting IATF 16949 process validation and end-of-line quality assurance in Tier 1 production lines.

Can the SN74LV541AQWRKSRQ1 interface between 3.3 V and 5 V logic domains?

Yes, the SN74LV541AQWRKSRQ1 supports true mixed-mode operation: its inputs tolerate 0–5.5 V regardless of VCC setting, and its outputs swing rail-to-rail within the applied VCC range (2–5.5 V). For example, with VCC = 3.3 V, it accepts 5 V sensor inputs and drives 3.3 V FPGA or MCU inputs-eliminating external level shifters. This capability is validated across –40°C to +125°C and documented in the Recommended Operating Conditions table of the official datasheet.

What is the maximum capacitive load the SN74LV541AQWRKSRQ1 can drive while maintaining specified timing?

The SN74LV541AQWRKSRQ1 is characterized and guaranteed to meet all switching specifications-including 6 ns max tpd at 5 V-with a 15 pF load. It remains functional up to 50 pF, though propagation delay increases (e.g., 8 ns at 5 V, CL = 50 pF). Driving loads >50 pF is not recommended, as timing margins degrade and output rise/fall times lengthen-potentially violating setup/hold windows in high-speed interfaces. Layout best practices advise minimizing trace capacitance via short, controlled-impedance routing.