Nexperia USA Inc. 74LVCH244ADB,112

Overview

74LVCH244ADB,112 from Nexperia is an octal 3-state buffer/line driver with dual output enables (1OE, 2OE), designed for bidirectional voltage translation between 1.2 V–3.6 V and 5.5 V-tolerant inputs in mixed-voltage systems. It features bus hold on all data inputs, Schmitt-trigger inputs for noise immunity, and IOFF partial power-down protection. Used in industrial control backplanes and FPGA I/O expansion interfaces requiring level-shifting and bus isolation.

For engineers reviewing the 74LVCH244ADB,112 datasheet, 74LVCH244ADB,112 pinout, 74LVCH244ADB,112 application, or 74LVCH244ADB,112 equivalent, key selection criteria include 3.6 V max supply, 5.5 V overvoltage-tolerant inputs, bus hold functionality, -40 °C to +125 °C operation, and SO20 (SOT163-1) package compatibility with legacy 74-series footprints.

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 range spans 0 V to 5.5 V regardless of VCC (1.2 V–3.6 V), enabling robust interfacing with 5 V TTL, 3.3 V LVTTL, and 1.8 V CMOS logic domains.

Key Specifications

Pinout & Package

74LVCH244ADB,112 uses the SO20 plastic small outline package (SOT163-1), 20-pin, 7.5 mm body width, standard 1.27 mm pitch, with gull-wing leads suitable for reflow and wave soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVC244ADB,112 and SN74LVC244APWR, the 74LVCH244ADB,112 uniquely provides integrated bus hold-reducing external component count and improving reliability in floating-input scenarios-while retaining full pin and functional compatibility with industry-standard SO20 layouts.

Availability

74LVCH244ADB,112 is available at Aetrix Electronics and suitable for industrial automation backplanes, automotive body control modules, and FPGA-based prototyping platforms requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVCH244ADB,112 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 74LVCH244A series belongs to Nexperia's advanced LVC logic family, engineered specifically for robust mixed-voltage interfacing, partial power-down resilience, and enhanced ESD survivability in harsh real-world applications.

FAQ

Can 74LVCH244ADB,112 operate with VCC = 1.2 V while accepting 5 V inputs?

Yes. The device supports VCC from 1.2 V to 3.6 V and tolerates input voltages up to 5.5 V regardless of supply level. At VCC = 1.2 V, VIH is guaranteed ≥1.08 V and VIL ≤0.12 V per datasheet Table 6, enabling reliable detection of 5 V logic edges without damage or misinterpretation.

Does the bus hold function apply to both data and control inputs?

No. Bus hold is implemented only on data inputs 1A0–1A3 and 2A0–2A3 (pins 2,4,6,8,17,15,13,11). Control inputs 1OE and 2OE (pins 1,19) lack bus hold circuitry and must be actively driven or pulled to defined logic states.

What is the maximum capacitive load this device can drive reliably?

Per datasheet Figure 6 and Table 9, the device is characterized with CL = 30 pF (VCC ≤2.7 V) and 50 pF (VCC ≥3.0 V) loads. Output drive strength remains compliant up to 50 pF; beyond that, propagation delay increases and VOH/VOL margins degrade-external buffering is recommended for >70 pF loads.

How does IOFF behave when VCC is ramped down during system shutdown?

IOFF activates when VCC falls below ~0.8 V, disabling outputs and limiting OFF-state leakage to ±20 μA (Table 6). This prevents reverse current flow from powered downstream circuits into the sinking device, protecting both the buffer and connected ICs during asymmetric power sequencing.