Nexperia USA Inc. 74LVT244APW,118

Overview

74LVT244APW,118 from Nexperia is a 3.3 V octal buffer/line driver with dual 3-state outputs, designed for high-speed bus interface in 2.7–3.6 V systems. It provides ±32 mA HIGH-level and +64 mA LOW-level output drive, overvoltage-tolerant inputs up to 5.5 V, and bus-hold circuitry eliminating external pull-ups. Used in industrial control backplanes and FPGA I/O expansion where level-shifting and bus contention control are required.

For engineers reviewing the 74LVT244APW,118 datasheet, 74LVT244APW,118 pinout, 74LVT244APW,118 application, or 74LVT244APW,118 equivalent, key selection criteria include 3-state timing (tPZH ≤ 5.2 ns), IOFF power-down support, TTL-compatible input thresholds, and TSSOP20 thermal performance under sustained 64 mA sink loads.

Technical Context

This BiCMOS octal buffer implements two independent 4-bit groups, each controlled by a dedicated active-low output enable (1OE, 2OE). Its bus-hold inputs maintain valid logic states on unused pins without external resistors, reducing BOM count and layout complexity.

The device supports live insertion and extraction due to IOFF circuitry that disables output leakage when VCC = 0 V, and tolerates 5.5 V inputs while operating from a 3.3 V supply-enabling direct interfacing between 3.3 V logic and legacy 5 V buses without level shifters.

Key Specifications

Pinout & Package

TSSOP20 package (SOT360-1): 20-pin thin shrink small outline, 4.4 mm body width, 0.65 mm pitch, 0.85 mm max height - optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVT244AD,118, the 74LVT244APW,118 offers superior thermal performance in space-constrained layouts; versus SN74LVC244APWR, it delivers higher drive strength and robust 5.5 V input tolerance essential for industrial interoperability.

Availability

74LVT244APW,118 is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA I/O expansion, legacy system upgrades, and automated test equipment requiring stable component supply across extended temperature ranges (−40 °C to +85 °C).

Supply support for 74LVT244APW,118 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 standard logic and discrete components, with leadership in automotive-qualified and industrial-grade solutions.

The 74LVT series targets high-speed, low-voltage bus interface applications in industrial automation and communications infrastructure, emphasizing robustness, timing precision, and mixed-voltage interoperability.

FAQ

What is the maximum clock frequency supported by the 74LVT244APW,118?

The device does not operate on a clock; it is an asynchronous buffer. Its 2.5 ns typical propagation delay (tPLH/tPHL at VCC = 3.3 V) supports reliable data transfer on buses running up to 200 MHz, assuming proper trace length matching and termination. Maximum usable frequency depends on system-level timing margins, not internal clocking.

Can the 74LVT244APW,118 safely interface with 5 V logic outputs?

Yes - its inputs tolerate up to 5.5 V regardless of VCC level (2.7–3.6 V), allowing direct connection to 5 V TTL or CMOS outputs without level shifters. However, outputs swing only to VCC (max 3.6 V), so external pull-ups are needed if driving 5 V inputs requiring VIH ≥ 3.5 V.

Does the bus-hold feature eliminate all need for external pull resistors?

Bus-hold eliminates pull resistors on *unused data inputs* (1A0–1A3, 2A0–2A3), retaining their last valid logic state. It does not replace pull-ups on OE pins - 1OE and 2OE must be actively driven LOW to enable outputs or pulled HIGH (e.g., via 10 kΩ to VCC) to disable them.

How does the IOFF feature behave during power sequencing?

When VCC drops below ~0.8 V, IOFF circuitry activates, limiting output leakage to ±100 μA even if outputs are tied to a live 5 V bus. This prevents back-powering of the 3.3 V domain and avoids latch-up during asymmetric power-up/down sequences in multi-rail systems.