Texas Instruments CLVC540AQDWRG4Q1

Overview

CLVC540AQDWRG4Q1 from Texas Instruments is an automotive-qualified octal buffer/driver with 3-state outputs, designed for 2 V to 3.6 V operation, supporting mixed-mode 5-V input/3.3-V VCC interfacing, with 5.3 ns max propagation delay at 3.3 V and Ioff partial-power-down protection. It drives bus lines or memory address registers in automotive control modules.

For engineers reviewing the CLVC540AQDWRG4Q1 datasheet, CLVC540AQDWRG4Q1 pinout, CLVC540AQDWRG4Q1 application, or CLVC540AQDWRG4Q1 equivalent, key selection considerations include its AEC-Q100 Grade 1 qualification (-40°C to +125°C), dual active-low 3-state enable (OE1/OE2), 24 mA output drive capability, and 5.5 V-tolerant inputs enabling level translation in heterogeneous voltage domains.

Technical Context

The CLVC540AQDWRG4Q1 implements eight noninverting buffer channels with independent input (A1–A8) and output (Y1–Y8) terminals on opposite sides of the SOIC-20 package, optimizing PCB layout. Its 3-state control uses a dual-input AND gate with active-low enables (OE1, OE2), ensuring all outputs enter high-impedance state if either enable is high.

It features Ioff circuitry that disables outputs during power-down to prevent backflow current, and supports mixed-voltage operation: inputs tolerate up to 5.5 V while VCC operates from 2 V to 3.6 V-enabling reliable interfacing between legacy 5-V logic and modern 3.3-V systems without external level shifters.

Key Specifications

Pinout & Package

CLVC540AQDWRG4Q1 is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm, 2.65 mm max height, RoHS-compliant, NIPDAU lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CLVC540AQDWRG4Q1, SN74LVC540AQPWRQ1 offers identical function in a smaller TSSOP package at the cost of reduced thermal efficiency, while SN74LVC540ADGSRQ1 delivers further miniaturization with integrated thermal management-but demands more complex assembly and layout validation.

Availability

CLVC540AQDWRG4Q1 is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and advanced driver assistance systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CLVC540AQDWRG4Q1 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-grade silicon, with over 50 years of innovation in high-reliability electronics.

The SN74LVC540A-Q1 product line delivers AEC-Q100-qualified logic buffers for automotive subsystems requiring robust voltage translation, bus isolation, and fail-safe 3-state control in harsh operating environments.

FAQ

What is the maximum input voltage CLVC540AQDWRG4Q1 can tolerate?

The CLVC540AQDWRG4Q1 accepts input voltages up to 5.5 V regardless of VCC level - a key feature enabling direct interfacing with 5-V legacy peripherals in mixed-voltage automotive systems. This specification is guaranteed across the full operating temperature range (–40°C to +125°C) and does not require external clamping circuitry. The CLVC540AQDWRG4Q1 input structure inherently handles this overvoltage condition without damage or functional degradation.

Does CLVC540AQDWRG4Q1 support partial-power-down operation?

Yes, CLVC540AQDWRG4Q1 integrates Ioff circuitry that disables all outputs when VCC is at 0 V or near-zero, preventing damaging current backflow from live inputs into a powered-down system rail. This behavior is verified per AEC-Q100 stress testing and is essential for automotive applications undergoing dynamic power sequencing, such as start-stop engine cycles or domain controller sleep/wake transitions. The CLVC540AQDWRG4Q1 maintains this protection without external components.

What is the recommended pull-up configuration for OE pins on CLVC540AQDWRG4Q1?

To ensure high-impedance state during power-up or power-down, OE1 and OE2 should each be tied to VCC through a pull-up resistor. TI specifies a minimum value determined by the current-sinking capability of the driving source - typically 10 kΩ suffices for most MCU GPIOs. This prevents floating enables that could cause unintended bus contention. The CLVC540AQDWRG4Q1 datasheet confirms this requirement applies to both OE pins independently for deterministic 3-state behavior.

Is CLVC540AQDWRG4Q1 pin-compatible with standard SN74LVC540A variants?

Yes, CLVC540AQDWRG4Q1 shares identical pinout, electrical characteristics, and functional behavior with non-automotive SN74LVC540A devices in SOIC-DW packages - including SN74LVC540ADWR. The only differences are AEC-Q100 qualification, extended temperature range (–40°C to +125°C), and automotive-specific screening/test protocols. All logic functions, timing parameters, and DC specs match exactly, making CLVC540AQDWRG4Q1 a drop-in replacement in automotive designs requiring enhanced reliability.

What thermal considerations apply to CLVC540AQDWRG4Q1 in continuous operation?

CLVC540AQDWRG4Q1 has a θJA of 58°C/W in SOIC-DW packaging. At maximum 24 mA per output and worst-case 3.6 V VCC, total power dissipation remains below 150 mW - resulting in < 10°C junction rise above ambient under typical board conditions. No heatsink is required, but TI recommends ≥1 cm² copper pour connected to GND pin (Pin 10) for improved thermal conduction. The CLVC540AQDWRG4Q1 thermal performance is validated across –40°C to +125°C ambient per AEC-Q100 thermal transient testing.