NXP Semiconductors 74AHCT244PW,112

Overview

74AHCT244PW,112 from Nexperia is an octal 3-state buffer/line driver with TTL-compatible inputs and dual independent output-enable controls (1OE, 2OE), operating from 4.5 V to 5.5 V supply. It provides eight bidirectional data paths split into two groups of four, supports mixed-voltage translation via overvoltage-tolerant inputs up to 5.5 V, and delivers 8 mA output drive at 5 V in industrial temperature range (−40 °C to +125 °C). It is used in bus interface isolation and address/data buffering in microcontroller peripheral expansion.

For engineers reviewing the 74AHCT244PW,112 datasheet, 74AHCT244PW,112 pinout, 74AHCT244PW,112 application, or 74AHCT244PW,112 equivalent, this page delivers verified electrical parameters, TSSOP20 package layout, real-world use cases in industrial control and embedded I/O expansion, and validated alternative parts with functional and timing differences.

Technical Context

The device implements two independent 4-bit non-inverting buffers, each controlled by a dedicated active-low output-enable input (1OE for Y0–Y3, 2OE for Y0'–Y3'). Inputs feature Schmitt-trigger action for noise immunity, and all inputs tolerate up to 5.5 V regardless of VCC, enabling level-shifting between 3.3 V logic domains and 5 V buses.

Propagation delay is specified at 3.5 ns (typ) to 9.5 ns (max) for signal path An→Yn and 3.5 ns to 13.0 ns for enable-to-output transitions under 5 V/50 pF load, with disable time ≤14.5 ns max. Static DC characteristics include VIH = 2.0 V min and VIL = 0.8 V max at VCC = 5 V, confirming true TTL input compatibility.

Key Specifications

Pinout & Package

TSSOP20 package (SOT360-1): 20-pin thin shrink small outline, 4.4 mm body width, 0.65 mm pitch, exposed thermal pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT244PW,112, the SO20 variant trades board space for thermal margin and assembly flexibility, while the TI SN74AHCT244PWR offers automotive qualification at minor timing cost-making the Nexperia TSSOP20 optimal for high-density industrial control designs demanding tight timing and low profile.

Availability

74AHCT244PW,112 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller address bus buffering, legacy peripheral interface, and test equipment signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHCT244PW,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, analog, and MOSFET solutions for industrial, automotive, and consumer markets.

The 74AHCT244 series belongs to Nexperia's advanced logic portfolio, engineered specifically for robust 5 V TTL interoperability, low-power operation, and extended temperature reliability in harsh embedded environments.

FAQ

What is the maximum clock frequency supported by the 74AHCT244PW,112?

The 74AHCT244PW,112 is not a clocked device-it has no internal clock and operates asynchronously. Its usable data rate depends on propagation delay (≤9.5 ns max) and load capacitance. With 50 pF load and 5 V supply, it reliably handles digital signals up to ~50 MHz (based on 10 ns period margin), provided setup/hold times of driven devices are met.

Can 74AHCT244PW,112 be used with a 3.3 V supply?

No. The 74AHCT244 variant requires VCC = 4.5 V to 5.5 V for guaranteed TTL input compatibility and correct VOH/VOL levels. For 3.3 V operation, use the pin-compatible 74AHC244PW,112, which accepts CMOS-level inputs (VIH = 3.85 V min at VCC = 5.5 V) but lacks TTL threshold compliance.

Is the thermal pad on the TSSOP20 package electrically connected?

No. The exposed thermal pad (pin 1 index area) in SOT360-1 has no electrical function. Nexperia specifies it may remain floating or be connected to GND-but if soldered, it must not be tied to any voltage other than GND, and no electrical requirement exists for soldering it.

How does the Schmitt-trigger input improve system reliability?

Schmitt-trigger inputs provide hysteresis (~0.5 V typical), meaning the rising and falling input thresholds differ. This prevents multiple output transitions due to slow-rising or noisy signals-critical for reliable operation on long PCB traces, unshielded cables, or in electrically noisy factory environments where edge jitter could otherwise cause metastability or false triggering.