Nexperia USA Inc. 74LVCH244ABQ,115

Overview

74LVCH244ABQ,115 from Nexperia is an octal 3-state buffer/line driver with dual output enables (1OE, 2OE), bus-hold inputs, and overvoltage-tolerant inputs up to 5.5 V. It operates from 1.2 V to 3.6 V, supports mixed-voltage translation between 3.3 V and 5 V systems, and features IOFF partial power-down protection. Used in address/data bus interfacing for microcontrollers and FPGAs in industrial control modules.

For engineers reviewing the 74LVCH244ABQ,115 datasheet, 74LVCH244ABQ,115 pinout, 74LVCH244ABQ,115 application, or 74LVCH244ABQ,115 equivalent, key selection criteria include bus-hold functionality, 20-terminal DHVQFN package thermal performance, 3.6 V absolute max input tolerance, and -40 °C to +125 °C operating range for harsh-environment embedded designs.

Technical Context

This device implements two independent 4-bit non-inverting buffers, each controlled by a dedicated active-low output enable (1OE or 2OE). All eight inputs feature Schmitt-trigger action and bus-hold circuitry-ensuring stable logic states without external pull-ups during floating conditions.

The IOFF circuit actively disables outputs when VCC = 0 V, blocking backflow current during partial power-down. Input voltage tolerance extends to 5.5 V regardless of VCC level, enabling robust level-shifting in heterogeneous voltage domains.

Key Specifications

Pinout & Package

DHVQFN20 package (SOT764-1): 2.5 mm × 4.5 mm × 0.85 mm body, 20-terminal leadless construction with exposed thermal pad; optimized for high-density PCB layouts and improved thermal dissipation over SO20/TSSOP variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVC244ABQ,115 and SN74LVC8T245RHLR, the 74LVCH244ABQ,115 uniquely combines bus-hold, IOFF, and 5.5 V input tolerance in a 20-terminal QFN - making it optimal for unidirectional, floating-aware, mixed-voltage industrial bus interfaces where pin compatibility and reliability are prioritized over bidirectionality.

Availability

74LVCH244ABQ,115 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, FPGA I/O expansion bridges, and medical imaging data acquisition systems requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for 74LVCH244ABQ,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 logic, discrete, and MOSFET solutions with focus on efficiency, reliability, and miniaturization for automotive, industrial, and consumer markets.

The 74LVCH244ABQ,115 belongs to Nexperia's LVC/LVCH advanced logic family, engineered specifically for low-voltage, high-noise-immunity digital interfacing in space-constrained and thermally demanding applications.

FAQ

Does the 74LVCH244ABQ,115 support true bidirectional data flow?

No. It is a unidirectional octal buffer with separate input (A) and output (Y) terminals per channel. Direction is fixed: data flows only from A to Y. For bidirectional operation, a transceiver like the 74LVC8T245 is required, which uses a DIR pin to control data direction.

Can the bus-hold feature be disabled?

No - bus-hold is permanently enabled on all data inputs (1A0–1A3, 2A0–2A3) and cannot be disabled via control pins or configuration. It activates automatically when input voltage falls within the undefined region (VIH < VI < VIL), providing ~75 μA holding current at 3.0 V.

What is the recommended PCB layout for the thermal pad?

The exposed thermal pad (terminal 1 index area) must be soldered to a solid copper pour connected to GND. Use 9 thermal vias (0.3 mm diameter, spaced evenly) beneath the pad to transfer heat to inner ground planes. Avoid solder mask coverage on the pad surface to ensure reliable thermal conduction.

How does IOFF behave when VCC is ramping during power-up?

IOFF activates only when VCC drops to 0 V - it does not engage during power-up ramp. Outputs remain in high-impedance state only after VCC has fully decayed to 0 V and re-enable only after VCC exceeds the minimum functional threshold (1.2 V) and stabilization time (~100 μs).