Nexperia USA Inc. 74AHC244BQ,115

Overview

74AHC244BQ,115 from Nexperia is an octal 3-state buffer/line driver in DHVQFN20 package, operating from 2.0 V to 5.5 V supply, featuring two independent output-enable inputs (1OE, 2OE), overvoltage-tolerant inputs up to 5.5 V, and Schmitt-trigger inputs for noise immunity - used in bidirectional bus interfacing and voltage-level translation between mixed-voltage subsystems in industrial control backplanes.

For engineers reviewing the 74AHC244BQ,115 datasheet, 74AHC244BQ,115 pinout, 74AHC244BQ,115 application, or 74AHC244BQ,115 equivalent, this device serves as a low-power, high-noise-immunity octal buffer with precise enable timing, dual-group 3-state control, and thermal-enhanced QFN packaging suitable for space-constrained PCB layouts requiring stable signal integrity across wide temperature ranges.

Technical Context

The 74AHC244BQ,115 implements two independent 4-bit buffer groups, each controlled by its own active-low output-enable input (1OE for Y0–Y3, 2OE for Y0'–Y3'), enabling selective bus isolation without affecting adjacent channels. Its CMOS logic family ensures rail-to-rail output swing and low static current draw.

Input overvoltage tolerance (up to 5.5 V regardless of VCC) and Schmitt-trigger action on all inputs allow robust operation in noisy environments and compatibility with 5 V signals even when powered at 3.3 V or 2.5 V - critical for mixed-supply system interconnects such as FPGA I/O expansion or microcontroller peripheral buses.

Key Specifications

Pinout & Package

DHVQFN20 (SOT764-1) package: 2.5 × 4.5 × 0.85 mm body, no leads, thermally enhanced exposed pad (GND-connected recommended), 20 terminals, pin 1 index marked on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT244BQ,115, the AHC variant offers superior noise immunity and wider input voltage flexibility, while SN74LVC244APWR trades overvoltage tolerance for lower-voltage operation and higher output current - making the 74AHC244BQ,115 optimal for mixed-supply, high-reliability industrial interfaces.

Availability

74AHC244BQ,115 is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA I/O expansion modules, and automotive body control units requiring stable component supply across extended temperature ranges and mixed-voltage signal domains.

Supply support for 74AHC244BQ,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 discrete, logic, and MOSFET devices with focus on efficiency, reliability, and miniaturization for industrial, automotive, and computing markets.

The 74AHC244BQ,115 belongs to Nexperia's advanced logic portfolio designed specifically for robust signal integrity in space-constrained, thermally demanding applications requiring precise timing control and mixed-voltage interoperability.

FAQ

Can the 74AHC244BQ,115 operate with VCC = 2.5 V while accepting 5 V inputs?

Yes. Its overvoltage-tolerant inputs function reliably up to 5.5 V regardless of VCC level, enabling safe interface with 5 V peripherals while powered from 2.5 V rails - confirmed by static characteristics tables showing VIH/VIL valid across 2.0–5.5 V VCC range and input clamp current limits up to ±20 mA.

What is the thermal performance advantage of the DHVQFN20 package over TSSOP20?

The DHVQFN20 (SOT764-1) package features an exposed thermal pad and thinner profile (0.85 mm vs. 1.0 mm), achieving ~30% lower junction-to-board thermal resistance than TSSOP20. Its derating slope is 12.9 mW/K above 111 °C, supporting higher sustained power dissipation in compact, high-density layouts.

How does the dual output-enable architecture improve system-level bus management?

Independent 1OE and 2OE inputs allow simultaneous but separate control of two 4-bit output groups - enabling time-multiplexed access to shared resources (e.g., one group for address lines, another for data), reducing arbitration logic complexity and eliminating bus contention during state transitions.

Is the exposed pad on the DHVQFN20 package electrically connected?

Terminal 10 is the functional GND pin; the exposed thermal pad (labeled GND(1)) has no mandatory electrical connection but must be either left floating or soldered to a GND plane. When soldered, it must remain at GND potential to avoid violating absolute maximum ratings - per datasheet note in Section 5.1.