Nexperia USA Inc. 74AHCT240PW,112

Overview

74AHCT240PW,112 from Nexperia is an octal inverting 3-state buffer/line driver with dual independent output-enable controls (1OE and 2OE), operating at 4.5–5.5 V supply, delivering 8 mA sink/source drive strength, propagation delay ≤8.5 ns (CL = 15 pF), and overvoltage-tolerant inputs up to 5.5 V - used for bidirectional bus isolation and level translation in industrial control backplanes.

For engineers reviewing the 74AHCT240PW,112 datasheet, 74AHCT240PW,112 pinout, 74AHCT240PW,112 application, or 74AHCT240PW,112 equivalent, key selection criteria include dual 4-bit enable control, Schmitt-trigger input hysteresis, -40 °C to +125 °C operation, TSSOP20 thermal performance, and TTL-compatible input thresholds.

Technical Context

The 74AHCT240PW implements two independent 4-bit inverting buffer sections, each controlled by its own active-low output-enable (1OE/2OE). Each section drives four 3-state outputs (1Y0–1Y3 or 2Y0–2Y3) with rail-to-rail logic swing and high-impedance OFF-state when enabled low.

Inputs feature Schmitt-trigger action for noise immunity and accept voltages up to 5.5 V regardless of VCC, enabling mixed-voltage interfacing (e.g., 3.3 V logic driving 5 V bus). Propagation delay is balanced across all channels (tpd ≤ 8.5 ns at VCC = 5 V, CL = 15 pF).

Key Specifications

Pinout & Package

TSSOP20 package (SOT360-1): 20-pin thin shrink small outline, 4.4 mm body width, 0.65 mm pitch, exposed pad optional (non-soldered or GND-connected per design).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AHCT240PWR, the 74AHCT240PW,112 offers identical functionality and form factor but with Nexperia's enhanced ESD robustness (CDM >1000 V) and extended lifetime availability; versus 74LVC240APW, it trades speed for 5 V tolerance and industrial temperature support.

Availability

74AHCT240PW,112 is available at Aetrix Electronics and suitable for industrial automation backplanes, microcontroller GPIO expansion, automated test equipment signal routing, and legacy instrumentation interfaces requiring stable component supply across extended temperature ranges.

Supply support for 74AHCT240PW,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 high-volume, high-reliability logic, analog, and discrete components - headquartered in Nijmegen, Netherlands, with manufacturing in Asia and Europe.

The 74AHCT240 belongs to Nexperia's advanced high-speed CMOS logic family, designed specifically for robust, low-power, mixed-voltage interfacing in industrial and automotive-adjacent applications.

FAQ

What is the maximum clock frequency supported by the 74AHCT240PW,112?

The 74AHCT240PW,112 is not a clocked device but a combinational buffer. Its usable data rate depends on propagation delay and load: with tpd ≤8.5 ns and CL = 15 pF, it reliably supports asynchronous bus toggling up to ~100 MHz in point-to-point configurations. System-level timing must account for board trace delays and fanout.

Can the 74AHCT240PW,112 interface a 3.3 V microcontroller to a 5 V peripheral?

Yes - its inputs tolerate up to 5.5 V regardless of VCC, allowing direct connection of 3.3 V MCU outputs to 74AHCT240PW,112 inputs while powering VCC at 5 V. Outputs then deliver full 5 V TTL logic levels to the peripheral, eliminating external level shifters.

Is the exposed thermal pad on the TSSOP20 package required to be soldered?

No - the exposed pad (terminal 1 index area) has no electrical function. Per Nexperia SOT360-1 documentation, it may remain unsoldered or be connected to GND if thermal relief is needed; if soldered, the land must be floating or tied to GND - never left floating electrically.

How does the Schmitt-trigger input improve noise immunity in real-world applications?

Schmitt-trigger inputs provide ≥0.5 V hysteresis between rising and falling thresholds, rejecting sub-threshold noise spikes and slow-rising edges from long cables or mechanical switches. This prevents false toggling in industrial environments with EMI from motors, relays, or RF sources - confirmed in Nexperia's characterization across -40 °C to +125 °C.