Nexperia USA Inc. 74LVC2244ABQ,115

Overview

74LVC2244ABQ,115 from Nexperia is an octal 3-state buffer/line driver with dual independent output enables (1OE, 2OE), integrated 30 Ω series termination resistors on all outputs, 5 V tolerant I/O, and operation from 1.2 V to 3.6 V supply. It functions as two 4-bit or one 8-bit buffer in mixed-voltage systems, supports partial power-down via IOFF, and features Schmitt-trigger inputs for noise immunity. Used in high-speed bus interfacing and level translation between 3.3 V and 5 V domains.

For engineers reviewing the 74LVC2244ABQ,115 datasheet, 74LVC2244ABQ,115 pinout, 74LVC2244ABQ,115 application, or 74LVC2244ABQ,115 equivalent, key selection criteria include 30 Ω on-die series termination for signal integrity, dual OE control for flexible bus partitioning, IOFF-enabled partial power-down, 5 V tolerance without external clamping, and DHVQFN20 thermal-enhanced packaging for compact high-density PCB layouts.

Technical Context

This device implements two independent 4-bit non-inverting buffers, each controlled by its own active-low output enable (1OE for Y0–Y3, 2OE for Y0'–Y3'). All eight outputs are 3-state capable and feature built-in 30 Ω series resistors to dampen reflections on transmission lines-eliminating need for discrete termination. Inputs incorporate Schmitt-trigger action, enabling robust operation with slow-rising signals and reducing susceptibility to noise.

The IOFF circuit ensures that when VCC = 0 V, all outputs enter high-impedance state and leakage current remains below ±20 μA even with 5.5 V applied at I/O pins-critical for hot-swap and multi-rail power sequencing. The device complies with JEDEC standards JESD8-7A, JESD8-5A, and JESD8-C/JESD36 across its full 1.2 V–3.6 V supply range and operates from −40 °C to +125 °C.

Key Specifications

Pinout & Package

DHVQFN20 (SOT764-1) package: 2.5 mm × 4.5 mm × 0.85 mm body, 20-terminal no-lead quad flat design with exposed thermal pad (non-soldered or floating GND connection per datasheet). Optimized for thermal dissipation and high-density routing in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC8T245RHLR and 74LVC244APW,118, the 74LVC2244ABQ,115 uniquely combines on-die 30 Ω termination, true 5 V I/O tolerance at sub-3.6 V supply, and DHVQFN20 thermal efficiency-making it optimal for space-constrained, high-reliability industrial bus interfaces where signal integrity and power sequencing robustness are critical.

Availability

74LVC2244ABQ,115 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive infotainment displays, and high-density FPGA I/O expansion requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for 74LVC2244ABQ,115 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, and energy-efficient components including logic, discrete, and MOSFET devices, serving automotive, industrial, and consumer markets.

The 74LVC2244A belongs to Nexperia's LVC (Low-Voltage CMOS) logic family, engineered for low-power, high-speed, mixed-voltage system interfacing with emphasis on robustness, signal integrity, and extended temperature operation.

FAQ

What is the function of the thermal pad (pin 1) in the DHVQFN20 package?

Pin 1 is an exposed thermal pad with no electrical function. Per Nexperia's datasheet, it has no mandatory solder requirement; if soldered, it must remain electrically floating or be connected to GND. Its primary role is passive heat conduction from the die to the PCB, improving thermal resistance by ~20 °C/W compared to non-thermal QFN variants.

Can 74LVC2244ABQ,115 drive a 50 Ω transmission line directly?

No-it provides 30 Ω series source termination, not 50 Ω. For optimal matching to a 50 Ω line, a 20 Ω external series resistor should be added at the driver output. The integrated 30 Ω resistor targets common PCB trace impedances (e.g., 60–70 Ω microstrip), reducing overshoot by ~40% versus no termination in typical 8–12 cm routing scenarios.

How does IOFF behave when VCC is ramped down during system power-off?

IOFF activates automatically as VCC falls below ~0.8 V, forcing all outputs into high-impedance state before supply collapse. Measured IOFF leakage stays ≤±20 μA even with 5.5 V applied to I/O pins at VCC = 0 V-preventing reverse current flow into powered-down rails and avoiding latch-up in multi-supply systems.

Is the Schmitt-trigger input threshold fixed or VCC-dependent?

Schmitt-trigger hysteresis is internally generated and independent of VCC, but the switching thresholds (VIL and VIH) scale with supply voltage per JEDEC JESD8-7A/5A/C. For example, at VCC = 1.8 V, VIH ≈ 1.17 V and VIL ≈ 0.63 V; at VCC = 3.3 V, VIH ≈ 2.0 V and VIL ≈ 0.8 V-ensuring consistent noise margin across operating voltages.