Nexperia USA Inc. 74AHCT244APWJ

Overview

74AHCT244APWJ from Nexperia is an octal 3-state buffer/line driver with TTL-compatible inputs, dual active-low output enables (1OE, 2OE), 2.8 ns typical propagation delay at 5 V, ±25 mA output drive, and Schmitt-trigger inputs for noise immunity. It operates from 4.5 V to 5.5 V and supports mixed-mode voltage translation between 3.3 V logic and 5 V bus systems in industrial control backplanes.

For engineers reviewing the 74AHCT244APWJ datasheet, 74AHCT244APWJ pinout, 74AHCT244APWJ application, or 74AHCT244APWJ equivalent, key selection criteria include 3-state timing skew (<1 ns), IOFF-enabled partial power-down capability, -40 °C to +125 °C operation, and TSSOP20 package compatibility with high-density PCB layouts.

Technical Context

This device implements two independent 4-bit buffered groups (Group 1: 1A0–1A3 → 1Y0–1Y3; Group 2: 2A0–2A3 → 2Y0–2Y3), each controlled by its own enable input (1OE, 2OE). All inputs feature Schmitt-trigger action, enabling robust operation with slow-rising signals and reducing susceptibility to noise-induced switching.

The IOFF circuit ensures outputs are disabled and leakage current limited to ≤0.5 μA when VCC = 0 V, preventing backflow current during hot-insertion or partial system power-down. Static and dynamic characteristics are fully specified across -40 °C to +125 °C, with VOL ≤ 0.55 V and VOH ≥ 3.7 V at 8 mA load under worst-case conditions.

Key Specifications

Pinout & Package

TSSOP20 (SOT360-1) package: plastic thin shrink small outline, 20 leads, 4.4 mm body width, 0.65 mm pitch, 1.1 mm max height - optimized for automated placement and thermal performance in space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AHCT244N and 74LVC244APW, the 74AHCT244APWJ uniquely combines 5 V bus translation, extended temperature operation, and IOFF safety-making it the sole option for industrial hot-swap-capable 5 V backplanes requiring TTL-level interoperability.

Availability

74AHCT244APWJ is available at Aetrix Electronics and suitable for industrial PLC backplanes, motor control interface boards, automated test equipment signal routing, and legacy system bus extenders requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHCT244APWJ 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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, reliability, and miniaturization for industrial and automotive markets.

The 74AHCT series targets high-speed, low-power 5 V logic interfacing with TTL compatibility and robust ESD/latch-up performance-designed specifically for industrial control, instrumentation, and legacy system upgrades.

FAQ

Does the 74AHCT244APWJ support hot-swap insertion into a live 5 V backplane?

Yes. Its IOFF circuitry disables outputs and limits power-off leakage to ≤0.5 μA when VCC = 0 V, preventing damaging backflow current during hot-plug events. This is verified per JESD78 Class II latch-up testing and confirmed in the datasheet's partial power-down section.

Can this device translate 3.3 V microcontroller outputs to drive a 5 V TTL bus?

Yes. Its TTL-compatible inputs accept VIH ≥ 2.0 V and VIL ≤ 0.8 V, allowing direct connection from 3.3 V CMOS outputs. The 5 V VCC supply ensures VOH ≥ 3.7 V and VOL ≤ 0.55 V at 8 mA, meeting TTL voltage thresholds reliably.

What is the maximum capacitive load this buffer can drive while maintaining timing specs?

It maintains tpd ≤ 7.4 ns (max) and skew ≤ 1 ns up to CL = 50 pF, as tested per Figure 5 and Table 7. For loads exceeding 50 pF, propagation delay increases linearly-designers should verify timing margins using the 4.4 ns (typ) tpd value at CL = 50 pF.

Is the TSSOP20 package RoHS-compliant and lead-free?

Yes. The 74AHCT244APWJ in SOT360-1 (TSSOP20) packaging meets RoHS Directive 2011/65/EU and is lead-free, halogen-free, and compliant with Nexperia's environmental policy. Full compliance documentation is available in the product's official material declaration.