Texas Instruments SN74LVC1G240DRYR

Overview

SN74LVC1G240 from Texas Instruments is a single-channel 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 drive at 3.3V, achieves 3.7ns max propagation delay, and supports 5.5V-tolerant inputs - enabling level translation in mixed-supply applications such as microcontroller I/O expansion.

For engineers reviewing the SN74LVC1G240 datasheet, SN74LVC1G240 pinout, SN74LVC1G240 application, or SN74LVC1G240 equivalent, key selection criteria include 3-state control timing (enable/disable), Ioff support for live insertion, input overvoltage tolerance, thermal performance in SON-6 package, and compatibility with 15pF–50pF capacitive loads.

Technical Context

The SN74LVC1G240 implements a CMOS-based inverting logic gate with active-low 3-state control via OE. Its balanced output stage sources and sinks symmetric current (±24mA @ 3.3V), ensuring consistent edge rates for both rising and falling transitions. The device features standard CMOS inputs with 4pF typical input capacitance and no internal pull resistors - requiring external termination for unused pins.

It integrates partial-power-down (Ioff) protection, disabling all outputs when VCC = 0V to prevent back-drive current, and includes negative-only clamp diodes on all I/O pins. Input voltage tolerance up to 5.5V enables interfacing with higher-voltage logic while powered from lower VCC (e.g., 1.8V or 3.3V), with guaranteed down-translation behavior.

Key Specifications

Pinout & Package

SN74LVC1G240DRYR uses the 6-pin SON (Small Outline No-Lead) package measuring 1.45mm × 1.0mm body size, optimized for space-constrained PCB layouts and automated assembly. Thermal resistance RθJA = 132°C/W (YZP variant) indicates superior heat dissipation versus SOT-23/SC70 alternatives.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G240DRYR, SN74LVC1G04DRYR removes bus isolation capability but simplifies control logic, while SN74AUP1G240DBVR trades speed for 20× lower static power - making each alternative optimal only within distinct power-speed-application constraints.

Availability

SN74LVC1G240DRYR is available at Aetrix Electronics and suitable for LED indicator driving, digital signal redriving, and transmission line interfacing requiring stable component supply, full production traceability, and long-term lifecycle support.

Supply support for SN74LVC1G240DRYR 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 expertise in high-reliability, low-power logic families.

The SN74LVC1G240 belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for interoperability across mixed-voltage systems and optimized for portable, automotive, and industrial applications demanding robustness and signal fidelity.

FAQ

What is the maximum capacitive load SN74LVC1G240DRYR can drive while maintaining specified timing?

SN74LVC1G240DRYR maintains full specification compliance up to 50pF load capacitance. At CL = 15pF, it achieves 3.7ns max propagation delay at 3.3V; at CL = 50pF, tpd increases to 4.7ns (–40°C to +125°C). For loads exceeding 50pF, TI recommends adding a series damping resistor near the output to suppress ringing and preserve signal integrity without violating absolute maximum ratings.

How should the OE pin be configured to ensure high-impedance state during power-up?

To guarantee high-impedance during power-up or power-down, the OE pin of SN74LVC1G240DRYR must be tied to VCC through an external pullup resistor. The minimum resistor value depends on the current-sinking capability of the controlling driver - typically 10kΩ suffices for most MCU GPIOs. This ensures OE remains logic-high until the controller actively drives it low, preventing bus contention.

Does SN74LVC1G240DRYR support operation at 1.8V supply voltage?

Yes, SN74LVC1G240DRYR is fully specified for operation at 1.8V (within its 1.65V–5.5V VCC range). At 1.8V, it delivers ±4mA output drive, supports 5.5V-tolerant inputs, and exhibits 6.9ns max tpd (CL = 15pF, –40°C to +85°C). All electrical characteristics including VIH/VIL thresholds and ICC remain valid per the recommended operating conditions table.

Can unused input pins on SN74LVC1G240DRYR be left floating?

No - unused input pins on SN74LVC1G240DRYR must never be left floating. As a CMOS device, floating inputs cause excessive power consumption, oscillation, and potential device damage. Inputs A and OE must be terminated to either VCC or GND using direct connection or a 10kΩ pullup/pulldown resistor. The NC pin (Pin 5) is internally unconnected and may be left unconnected.

What is the thermal performance advantage of the DRY (SON-6) package used in SN74LVC1G240DRYR?

The DRY package in SN74LVC1G240DRYR provides significantly lower thermal resistance than comparable SOT-23 or SC70 packages - RθJA = 132°C/W (vs. 357°C/W for DBV). This 73% reduction enables higher sustained output current or operation in thermally constrained environments without derating, especially critical in dense, fanless industrial modules where junction temperature must stay below 125°C.