Texas Instruments 74LVC1G240DCKRG4

Overview

74LVC1G240DCKRG4 from Texas Instruments is a single inverting buffer/driver with 3-state output, designed for signal conditioning and bus isolation in low-voltage digital systems. It operates from 1.65V to 5.5V, delivers ±24mA output 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 74LVC1G240DCKRG4 datasheet, 74LVC1G240DCKRG4 pinout, 74LVC1G240DCKRG4 application, or 74LVC1G240DCKRG4 equivalent, key selection criteria include 3-state timing control, over-voltage tolerant inputs (up to 5.5V), thermal performance in SC70-5 package, and compatibility with mixed-voltage logic interfaces.

Technical Context

The 74LVC1G240DCKRG4 implements a CMOS-based inverting buffer with active-low 3-state enable (OE), where output Y = NOT(A) when OE is low and enters high-impedance when OE is high. Its balanced CMOS output stage enables symmetrical sourcing/sinking capability up to ±24mA at 3.3V.

It features Ioff circuitry that disables all outputs during partial power-down (VCC = 0V), limiting leakage to ±10μA, and includes over-voltage tolerant inputs rated to 5.5V independent of VCC-enabling safe interfacing with higher-voltage logic domains while operating at 1.65V–5.5V supply.

Key Specifications

Pinout & Package

74LVC1G240DCKRG4 is packaged in a 5-pin SC70 (DCK) package measuring 2.0mm × 2.1mm with 1.25mm body width, 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 3-state buffer applications.

Compared with SN74LVC1G04DCKR and 74LVC1G125DCKR, the 74LVC1G240DCKRG4 uniquely combines inversion and 3-state control in one SC70-5 device-enabling compact bus arbitration and polarity correction without additional logic or layout changes.

Availability

74LVC1G240DCKRG4 is available at Aetrix Electronics and suitable for industrial control interfaces, automotive sensor signal conditioning, and portable medical device logic isolation requiring stable component supply and long-term manufacturability.

Supply support for 74LVC1G240DCKRG4 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 logic solutions with broad industrial, automotive, and communications portfolio coverage.

The SN74LVC1G240 series belongs to TI's low-voltage LVC logic family, engineered for high-speed, low-power signal buffering and bus interface applications in space- and power-constrained systems.

FAQ

What is the maximum input voltage rating for 74LVC1G240DCKRG4?

The 74LVC1G240DCKRG4 supports input voltages up to 5.5V regardless of VCC level, enabling direct interfacing with 5V logic while operating from as low as 1.65V. This over-voltage tolerance is implemented via internal protection circuitry without positive clamp diodes, and must not exceed the absolute maximum rating of 6.5V to avoid permanent damage.

How does the OE pin function on 74LVC1G240DCKRG4?

The OE (output enable) pin on 74LVC1G240DCKRG4 is active-low: when OE is low, the inverting buffer operates normally (Y = NOT(A)); when OE is high, the output Y enters high-impedance state. To ensure safe power-up behavior, TI recommends tying OE to VCC through a pullup resistor-minimum value determined by the driver's current-sinking capability.

Can 74LVC1G240DCKRG4 drive a 50Ω transmission line?

Yes, the 74LVC1G240DCKRG4 can drive a 50Ω transmission line effectively: at 3.3V supply, it delivers ±24mA output current, which corresponds to ~66mA into 50Ω (VCC/50Ω), well within its rated drive capability. For optimal signal integrity, place the device near the line source and consider adding a small series damping resistor if ringing occurs.

What is the thermal resistance (RθJA) of 74LVC1G240DCKRG4 in its SC70 package?

The 74LVC1G240DCKRG4 in the DCK (SC70-5) package has a junction-to-ambient thermal resistance (RθJA) of 371°C/W, as specified in TI's official datasheet. This value assumes standard JEDEC test conditions (single-layer copper, 1-inch² pad); actual board-level performance improves significantly with added copper area and thermal vias.

Does 74LVC1G240DCKRG4 support partial power-down operation?

Yes, 74LVC1G240DCKRG4 includes Ioff circuitry that disables all outputs when VCC = 0V, limiting leakage current to ±10μA per I/O pin. This feature enables live insertion, hot-swap capability, and back-drive protection in systems where subsystems power up/down independently-critical for modular industrial and telecom equipment designs.