Texas Instruments 74LVC1G240DBVTG4

Overview

74LVC1G240DBVTG4 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 5.5V-tolerant inputs - enabling use in mixed-voltage interfaces such as microcontroller GPIO expansion or LED driver control.

For engineers reviewing the 74LVC1G240DBVTG4 datasheet, 74LVC1G240DBVTG4 pinout, 74LVC1G240DBVTG4 application, or 74LVC1G240DBVTG4 equivalent, key selection criteria include 3-state enable timing (ten/tdis), Ioff support for live insertion, input voltage translation capability, and SOT-23-5 package compatibility with space-constrained PCB layouts.

Technical Context

This device implements a CMOS-based inverting logic gate with active-low 3-state control via OE. Its balanced output stage enables symmetrical sourcing/sinking (±24mA @ 3.3V), while the Ioff feature disables all outputs when VCC = 0V - critical for hot-swap and partial-power-down systems. Input structure includes over-voltage tolerance up to 5.5V independent of VCC.

The functional mode table confirms strict truth-table behavior: Y = NOT(A) when OE = L; Y = high-impedance when OE = H. No internal latching or Schmitt-triggering is present - it is a pure combinatorial inverter with tri-state capability, optimized for signal redriving rather than level-shifting or noise immunity.

Key Specifications

Pinout & Package

74LVC1G240DBVTG4 uses the DBV (SOT-23-5) package: 2.9mm × 2.8mm footprint, 5-pin surface-mount, lead-free and RoHS-compliant. Pin 1 is OE (active-low enable), Pin 2 is input A, Pin 3 is GND, Pin 4 is output Y, and Pin 5 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G04DBVT and 74LVC1G125DBVT, the 74LVC1G240DBVTG4 uniquely combines inversion and 3-state control in a single SOT-23-5 package - eliminating need for additional logic or layout rerouting in bus arbitration or reset management circuits.

Availability

74LVC1G240DBVTG4 is available at Aetrix Electronics and suitable for industrial control panels, automotive body electronics, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVC1G240DBVTG4 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 decades of experience in high-reliability industrial and automotive-grade components.

The SN74LVC1G240 product line targets space-constrained, low-power digital interface applications - delivering robust 3-state buffering with voltage translation and hot-swap readiness in ultra-small packages.

FAQ

What is the maximum capacitive load the 74LVC1G240DBVTG4 can drive while maintaining specified timing?

The 74LVC1G240DBVTG4 is characterized for CL ≤ 50pF across its full operating range. At 3.3V and –40°C to +125°C, switching parameters (tpd, ten, tdis) remain within datasheet limits up to this load. Driving larger capacitances may increase propagation delay and cause ringing; TI recommends adding a series damping resistor for loads exceeding 50pF. The 74LVC1G240DBVTG4's 4pF input capacitance also minimizes loading on upstream drivers.

How should the OE pin of the 74LVC1G240DBVTG4 be handled during power-up to ensure predictable output state?

To guarantee high-impedance output during power-up and power-down, OE must be tied to VCC through a pullup resistor. TI specifies no minimum resistance value, but design practice uses 10kΩ to balance leakage current (≤10μA) and noise immunity. This prevents unintended output activation before firmware initializes OE control. The 74LVC1G240DBVTG4 does not include internal pullups, so external biasing is mandatory for robust system behavior.

Does the 74LVC1G240DBVTG4 support true level shifting between different supply domains?

The 74LVC1G240DBVTG4 supports down-translation only: inputs tolerate up to 5.5V regardless of VCC (e.g., 1.8V), but output swing is rail-to-rail relative to VCC - it cannot generate 5V outputs when powered from 1.8V. For bidirectional level shifting, a dedicated translator like TXB0104 is required. The 74LVC1G240DBVTG4's primary role is signal conditioning within a single VCC domain, with input overvoltage tolerance as a secondary benefit.

Can multiple 74LVC1G240DBVTG4 outputs be paralleled to increase drive strength?

Yes - two or more 74LVC1G240DBVTG4 outputs with identical A and OE signals can be wired in parallel to double or triple sink/source current capability (e.g., ±48mA). This is explicitly supported in TI's documentation and leverages the device's balanced CMOS outputs. Ensure matched trace lengths and simultaneous OE control to avoid shoot-through; no external resistors are needed between paralleled outputs.

Is the 74LVC1G240DBVTG4 compatible with lead-free reflow profiles and RoHS requirements?

Yes - the 74LVC1G240DBVTG4 is manufactured in TI's lead-free, RoHS-compliant NanoFree™ DBV (SOT-23-5) package and qualified for standard Pb-free reflow profiles (J-STD-020, peak 260°C). The device carries TI's green marking and meets JEDEC moisture sensitivity level 1 (MSL-1), allowing unlimited floor life at ≤30°C/60% RH. Full compliance documentation is available in TI's official packaging reports for 74LVC1G240DBVTG4.