Nexperia USA Inc. 74LVC244ABQ,115

Overview

74LVC244ABQ,115 from Nexperia is an octal 3-state buffer/line driver in DHVQFN20 package (2.5 × 4.5 × 0.85 mm), designed for bidirectional bus interfacing in mixed-voltage systems. It features two independent 4-bit sections (1A/1Y and 2A/2Y), dual active-low output enables (1OE, 2OE), Schmitt-trigger inputs for noise immunity, and IOFF partial power-down protection. It operates from 1.2 V to 3.6 V and supports 5.5 V-tolerant inputs - enabling reliable level translation between 3.3 V logic and legacy 5 V peripherals in industrial control backplanes.

For engineers reviewing the 74LVC244ABQ,115 datasheet, 74LVC244ABQ,115 pinout, 74LVC244ABQ,115 application, or 74LVC244ABQ,115 equivalent, this device is selected for high-density board space constraints, low-voltage I/O compatibility, deterministic 3-state timing control, and robust ESD resilience (HBM >2000 V) in automotive body electronics and programmable logic interface designs.

Technical Context

This device implements two independent 4-bit non-inverting buffer sections, each controlled by its own active-low output enable (1OE for Y0–Y3, 2OE for Y4–Y7). All inputs include Schmitt-trigger action with hysteresis ≥0.1 V, ensuring clean signal recovery from slow-rising or noisy sources. The IOFF circuit actively disables outputs during power-down, blocking backflow current when VCC = 0 V.

It complies with JEDEC standards JESD8-7A (1.65–1.95 V), JESD8-5A (2.3–2.7 V), and JESD8-C/JESD36 (2.7–3.6 V), and guarantees operation across –40 °C to +125 °C ambient. Propagation delay is 1.5–7.5 ns (VCC = 1.2–3.6 V), with enable/disable times ≤9.5 ns and output skew ≤1.5 ns - critical for synchronous bus hold integrity in FPGA-to-ASIC interconnects.

Key Specifications

Pinout & Package

DHVQFN20 package (SOT764-1): 2.5 mm × 4.5 mm × 0.85 mm body, 0.5 mm pitch, no leads, exposed thermal pad (GND-connected per layout guidelines), 20 terminals, pin 1 index area marked on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVCH244ABQ, the LVC variant lacks bus-hold but offers identical speed, voltage tolerance, and IOFF - making it preferable where input termination is externally managed. Versus SN74LVC244APWR, the BQ package delivers superior thermal dissipation and 35% smaller footprint, critical for space-constrained automotive modules.

Availability

74LVC244ABQ,115 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, FPGA configuration interfaces, and automated test equipment requiring stable component supply across extended temperature ranges and high-volume production cycles.

Supply support for 74LVC244ABQ,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 focused on high-volume, high-reliability logic, analog, and MOSFET solutions, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.

The 74LVC series targets low-voltage, high-speed digital interfacing in space- and power-constrained applications - emphasizing robustness, mixed-voltage compatibility, and AEC-Q100 qualification readiness for automotive-grade use.

FAQ

What is the maximum input voltage the 74LVC244ABQ,115 can tolerate when powered from 1.8 V?

The device supports 5.5 V-tolerant inputs regardless of VCC level. When powered from 1.8 V, inputs may swing from 0 V to 5.5 V without damage or functional disruption - enabling direct connection to 5 V TTL outputs without external level-shifting circuitry. This is guaranteed per Table 5 (VI input voltage) and Table 4 (limiting values) in the official Nexperia datasheet Rev. 14.

Does the 74LVC244ABQ,115 include bus-hold functionality on its inputs?

No. Bus-hold (IBHL/IBHH) is exclusive to the 74LVCH244A variant. The 74LVC244ABQ lacks internal bus-hold circuitry, meaning unused inputs must be externally terminated to VCC or GND to prevent floating states and potential shoot-through current. This distinction is explicitly stated in Section 2 (Features and benefits) and Table 6 footnotes of the datasheet.

How does the IOFF feature protect the device during partial power-down?

When VCC = 0 V, the IOFF circuit disables all outputs and blocks current flow between powered and unpowered sections of the system. Measured IOFF leakage is ≤±10 μA (Table 6), preventing damaging backflow current through the device - a critical safeguard during hot-swap operations or staged power sequencing in modular industrial controllers.

What is the thermal performance difference between DHVQFN20 (SOT764-1) and TSSOP20 (SOT360-1) packages?

The DHVQFN20 package (74LVC244ABQ) has a thermal derating factor of 12.9 mW/K above 111 °C, while the TSSOP20 (74LVC244APW) derates at 10.0 mW/K above 100 °C. The QFN's exposed thermal pad enables lower junction-to-board resistance, allowing higher sustained output current in thermally constrained environments like sealed automotive enclosures.