Texas Instruments 74LVC1G240DCKRE4

Overview

74LVC1G240DCKRE4 from Texas Instruments is a single inverting buffer/driver with 3-state output, designed for signal conditioning and bus isolation in space-constrained 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 5.5V-tolerant inputs - enabling level translation in mixed-voltage interfaces such as microcontroller GPIO expansion or sensor data routing.

For engineers reviewing the 74LVC1G240DCKRE4 datasheet, 74LVC1G240DCKRE4 pinout, 74LVC1G240DCKRE4 application, or 74LVC1G240DCKRE4 equivalent, key selection criteria include its SC70-5 package footprint, Ioff-enabled live insertion capability, guaranteed 3-state leakage ≤10μA, and compatibility with 15pF/30pF load-driven timing budgets in industrial control and portable electronics.

Technical Context

The 74LVC1G240DCKRE4 implements a CMOS-based inverting logic gate with active-low output enable (OE), where Y = NOT(A) when OE is low and Y = high-impedance when OE is high. Its balanced push-pull output stage provides symmetrical sourcing/sinking capability up to ±24mA at 3.3V, supporting clean signal redriving without external biasing.

It integrates partial-power-down protection (Ioff), allowing safe operation during VCC ramp-up/down or hot-swap scenarios by disabling all outputs when VCC = 0V. Input voltage tolerance up to 5.5V enables interfacing with 5V logic while powered from 1.8V or 3.3V rails - a critical feature for voltage-level bridging in modern low-power embedded designs.

Key Specifications

Pinout & Package

74LVC1G240DCKRE4 is packaged in a 5-pin SC70 (DCK) case measuring 2.0mm × 2.1mm with 1.25mm body width - optimized for ultra-dense PCB layouts in wearables and compact modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G04DCKRE4 and 74LVC1G125DCKRE4, the 74LVC1G240DCKRE4 uniquely combines inverting logic with 3-state control in the SC70-5 package - making it the only option among the three for applications requiring both polarity inversion and dynamic bus disconnection.

Availability

74LVC1G240DCKRE4 is available at Aetrix Electronics and suitable for industrial control panels, portable medical devices, and automotive body electronics requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for 74LVC1G240DCKRE4 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 for industrial, automotive, and consumer markets.

The SN74LVC1G240 belongs to TI's LVC low-voltage CMOS logic family, engineered for high-speed, low-power signal conditioning in mixed-voltage digital systems - particularly targeting space-constrained, battery-operated, and hot-swap-capable applications.

FAQ

What is the maximum operating temperature range for the 74LVC1G240DCKRE4?

The 74LVC1G240DCKRE4 is rated for operation from –40°C to +125°C ambient temperature. This extended industrial temperature range is validated per JEDEC JESD78 latch-up testing and thermal metrics including RθJA = 371°C/W for the DCK package - ensuring reliable performance in under-hood automotive modules and factory-floor PLCs where thermal stress is significant.

Does the 74LVC1G240DCKRE4 support 5V logic inputs while powered from a 1.8V supply?

Yes, the 74LVC1G240DCKRE4 supports input voltages up to 5.5V regardless of VCC level - a feature explicitly documented in its Recommended Operating Conditions and Absolute Maximum Ratings tables. When powered from 1.8V, the device correctly interprets 5V-tolerant inputs as valid logic HIGH/LOW states, enabling seamless interfacing between legacy 5V peripherals and modern low-voltage controllers without external level-shifting circuitry.

How should the OE pin be handled during power-up to ensure predictable behavior of the 74LVC1G240DCKRE4?

To guarantee high-impedance output during power-up, the OE pin of the 74LVC1G240DCKRE4 must be tied to VCC through a pullup resistor. TI specifies that the minimum resistor value depends on the current-sinking capability of the driving source - typically 10kΩ suffices for most microcontroller GPIOs. This prevents unintended output activation before firmware initializes the OE control line, avoiding bus contention or false triggering in multi-device systems.

Can the 74LVC1G240DCKRE4 drive a 50pF capacitive load while maintaining its specified propagation delay?

Yes, the 74LVC1G240DCKRE4 is characterized for CL = 30pF and 50pF loads in its Switching Characteristics tables. At 3.3V and –40°C to 85°C, tpd remains ≤4.5ns for CL = 30pF and ≤4.7ns for CL = 50pF - well within functional timing margins for most 25–50MHz digital interfaces. For loads exceeding 50pF, TI recommends adding a series damping resistor near the output to suppress ringing without degrading edge rate.

Is the 74LVC1G240DCKRE4 pin-compatible with other SC70-5 logic devices from Texas Instruments?

The 74LVC1G240DCKRE4 uses the standard SC70-5 pinout defined by TI for single-gate logic: Pin 1 = OE, Pin 2 = A, Pin 3 = GND, Pin 4 = Y, Pin 5 = VCC. This layout matches SN74LVC1G04DCKRE4, SN74LVC1G125DCKRE4, and SN74LVC1G126DCKRE4 - enabling direct PCB footprint reuse across inverting/non-inverting and 3-state/non-3-state variants, provided signal routing and OE control logic are adapted accordingly.