Nexperia USA Inc. 74AHCT240D,112

Overview

74AHCT240D,112 from Nexperia is an octal inverting 3-state buffer/line driver in SO20 package, operating at 4.5–5.5 V with propagation delay ≤8.5 ns (CL = 15 pF), input overvoltage tolerance up to 7.0 V, and industrial temperature range (−40 °C to +125 °C). It serves as bidirectional bus interface or level translator in mixed-voltage digital systems such as industrial PLC I/O modules.

For engineers reviewing the 74AHCT240D,112 datasheet, 74AHCT240D,112 pinout, 74AHCT240D,112 application, or 74AHCT240D,112 equivalent, key selection criteria include dual independent 4-bit 3-state control (1OE/2OE), Schmitt-trigger inputs for noise immunity, TTL-compatible input thresholds, and SO20 thermal performance at full temperature range.

Technical Context

The 74AHCT240D implements two independent 4-bit inverting buffer sections, each controlled by a dedicated active-low output enable (1OE, 2OE). Inputs accept voltages up to 7.0 V regardless of VCC, enabling use as voltage translators between 3.3 V and 5 V domains.

Each output drives up to 8 mA (sink/source) with guaranteed VOL ≤ 0.55 V and VOH ≥ 3.70 V at VCC = 4.5 V and TA = −40 °C to +125 °C. Propagation delay and enable/disable timing are fully characterized across temperature and load (CL = 15 pF and 50 pF).

Key Specifications

Pinout & Package

74AHCT240D,112 uses the SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads, JEDEC MS-013 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AHCT240N and 74LVC240APW, the 74AHCT240D,112 uniquely combines 5 V operation, input overvoltage tolerance, SO20 thermal performance, and industrial temperature range - making it the sole option for robust 5 V mixed-signal bus isolation in harsh environments.

Availability

74AHCT240D,112 is available at Aetrix Electronics and suitable for industrial automation, automotive power distribution, test equipment signal conditioning, and legacy system upgrades requiring stable component supply across extended temperature ranges.

Supply support for 74AHCT240D,112 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

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74AHCT240 belongs to Nexperia's advanced high-speed CMOS logic family, engineered for robust 5 V digital interfacing with enhanced noise immunity, wide operating temperature, and mixed-voltage translation capability.

FAQ

Is the 74AHCT240D,112 compatible with 3.3 V input signals?

Yes - its inputs accept voltages from −0.5 V to +7.0 V regardless of VCC, and VIH/VIL thresholds (2.0 V/0.8 V) are fully compatible with 3.3 V CMOS logic levels when VCC = 5.0 V. No level shifter is needed for driving from 3.3 V sources.

What is the maximum capacitive load the outputs can drive reliably?

The device is characterized up to 50 pF load capacitance, with propagation delay ≤11.9 ns and disable time ≤11.5 ns at VCC = 4.5–5.5 V and TA = −40 °C to +125 °C. For loads >50 pF, add series termination or verify timing margins using the provided CPD = 9 pF value.

Does the SO20 package require thermal pad soldering?

No - the SO20 (SOT163-1) package has no exposed thermal pad. Thermal dissipation relies on copper pour on GND/VCC pins and standard PCB trace width design; Ptot = 500 mW at Tamb ≤ 109 °C with linear derating above that point.

Can both output enable pins be tied together for single-control operation?

Yes - 1OE and 2OE may be connected to a common control signal to operate the device as a unified 8-bit inverting buffer. This configuration maintains full electrical performance but eliminates independent group control capability.