Texas Instruments 74LVC1G240DBVRG4

Overview

74LVC1G240DBVRG4 from Texas Instruments is a single inverting buffer/driver with 3-state output, designed for level translation and bus isolation in low-voltage digital systems. It operates from 1.65V to 5.5V, delivers ±24mA drive at 3.3V, achieves 3.7ns max propagation delay, and supports Ioff for live insertion-used in controller reset hold and transmission line redriving.

For engineers reviewing the 74LVC1G240DBVRG4 datasheet, 74LVC1G240DBVRG4 pinout, 74LVC1G240DBVRG4 application, or 74LVC1G240DBVRG4 equivalent, key selection criteria include 3-state timing (ten/tdis), overvoltage-tolerant inputs (up to 5.5V), NanoFree™ SOT-23-5 package footprint, and Ioff-enabled partial power-down capability.

Technical Context

This device implements a CMOS-based inverting logic gate with active-low 3-state control: when OE is low, A is inverted and driven to Y; when OE is high, Y enters high-impedance state. Its balanced output stage enables symmetrical sourcing/sinking (±24mA @ 3.3V) and fast edge rates into light loads.

The input structure includes overvoltage tolerance (VI up to 5.5V independent of VCC) and clamp diodes only on the negative side. Ioff functionality ensures outputs remain high-Z and leakage-limited (<10μA) when VCC = 0V, supporting hot-swap and system-level power sequencing.

Key Specifications

Pinout & Package

74LVC1G240DBVRG4 uses the DBV (SOT-23-5) package: 2.9mm × 2.8mm body with 5-pin surface-mount configuration, optimized for space-constrained PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVC1G240DBVRG4, SN74LVC1G04DBVR sacrifices bus isolation capability for lower complexity, while 74LVC1G125DBVR maintains identical timing and drive but requires external polarity management - making 74LVC1G240DBVRG4 optimal for reset-hold and bidirectional bus control where inversion is inherent to the protocol.

Availability

74LVC1G240DBVRG4 is available at Aetrix Electronics and suitable for industrial control interfaces, portable instrumentation signal conditioning, and automotive body electronics requiring stable component supply and long-term lifecycle support.

Supply support for 74LVC1G240DBVRG4 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 focused on analog and embedded processing technologies, with decades of expertise in logic, power management, and signal chain solutions.

The SN74LVC1G240 product line delivers ultra-small, low-power, voltage-flexible logic buffers for space- and power-constrained applications including wearables, IoT edge nodes, and modular industrial controllers.

FAQ

What is the maximum operating temperature for the 74LVC1G240DBVRG4?

The 74LVC1G240DBVRG4 is rated for operation from –40°C to +125°C ambient temperature. This extended range is validated per JEDEC JESD78 latch-up testing and thermal metrics (RθJA = 357.1°C/W for DBV package), enabling use in under-hood automotive modules and industrial motor drives where thermal stress is critical. Always verify junction temperature using actual power dissipation and PCB copper area.

Does the 74LVC1G240DBVRG4 support 5V-tolerant inputs when powered from 1.8V?

Yes, the 74LVC1G240DBVRG4 supports input voltages up to 5.5V regardless of VCC level - including when VCC = 1.8V. This overvoltage tolerance is implemented via dedicated input protection circuitry without positive clamp diodes, allowing direct interfacing with 5V legacy peripherals without external level shifters. Input thresholds scale with VCC per JEDEC standards.

How should the OE pin be handled during power-up to ensure safe default state?

To guarantee high-impedance output during power-up or brownout, tie OE to VCC through a pullup resistor - typically 10kΩ - as specified in TI's application guidance. This prevents unintended output assertion before system initialization. The resistor value balances current-sinking capability of the driving source against leakage and noise immunity; values below 4.7kΩ may increase static current unnecessarily.

Can the 74LVC1G240DBVRG4 drive a 50Ω transmission line directly?

Yes, the 74LVC1G240DBVRG4 can drive a 50Ω load directly due to its ±24mA output drive at 3.3V, producing ~1.2V swing into 50Ω (V = I × R). For clean edges and minimal reflections, use series damping (e.g., 33Ω) near the output and maintain short, impedance-controlled traces. Layout guidelines recommend ≤12cm trace length and unbroken ground plane beneath signal paths.

Is the 74LVC1G240DBVRG4 pin-compatible with other SOT-23-5 logic devices?

The 74LVC1G240DBVRG4 uses standard SOT-23-5 pinout (OE-A-GND-Y-VCC), matching TI's SN74LVC1G04DBVR, SN74LVC1G125DBVR, and SN74LVC1G126DBVR. However, functional compatibility requires verification: OE polarity, inversion vs. non-inversion, and timing specs differ. Pinout alignment simplifies PCB reuse but does not guarantee drop-in replacement without logic review.