Nexperia USA Inc. 74LVC244ADB,112

Overview

74LVC244ADB,112 from Nexperia is an octal 3-state buffer/line driver in SO20 (SOT163-1) package, designed for bidirectional bus interfacing and level translation between 1.2 V–3.6 V logic domains. It features dual independent output enables (1OE, 2OE), Schmitt-trigger inputs for noise immunity, IOFF partial power-down protection, and overvoltage-tolerant inputs up to 5.5 V - enabling reliable operation in mixed-voltage systems such as industrial I/O expansion and FPGA peripheral buffering.

For engineers reviewing the 74LVC244ADB,112 datasheet, 74LVC244ADB,112 pinout, 74LVC244ADB,112 application, or 74LVC244ADB,112 equivalent, key selection criteria include its 1.2 V–3.6 V supply range, 24 mA drive strength at 3.0 V, 5.9 ns max propagation delay, IOFF-enabled hot-swap capability, and compatibility with both 3.3 V and 5 V input sources without external level shifters.

Technical Context

This device implements two independent 4-bit non-inverting buffers, each controlled by a dedicated active-low output enable (1OE for Y0–Y3 group, 2OE for Y0–Y3 group). Its CMOS architecture supports rail-to-rail input thresholds defined per JEDEC standards (JESD8-7A/5A/C), with Schmitt-trigger hysteresis ensuring robust timing against slow-rising signals.

The IOFF circuit actively disables outputs when VCC = 0 V, blocking backflow current during partial power-down - critical for hot-plug interfaces. Input tolerance to 5.5 V allows direct connection to legacy 5 V TTL outputs while operating from a 1.8 V or 2.5 V supply, eliminating need for discrete translators in voltage-domain bridging applications.

Key Specifications

Pinout & Package

74LVC244ADB,112 uses the SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads. Pin 1 marked with index notch; standard JEDEC MS-013 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVC244APW,118, the 74LVC244ADB,112 offers superior mechanical robustness and easier hand-soldering due to SO20 lead geometry, while SN74LVC244APWR provides second-source assurance at the cost of ~1.6 ns added propagation delay - a trade-off requiring layout- and timing-aware evaluation.

Availability

74LVC244ADB,112 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, FPGA peripheral interfacing, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVC244ADB,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 - delivering energy-efficient, scalable components for automotive, industrial, and consumer markets.

The 74LVC244A series belongs to Nexperia's LVC logic family, engineered for ultra-low power consumption and robust mixed-voltage interoperability in space- and power-constrained embedded systems.

FAQ

Can 74LVC244ADB,112 operate with a 1.2 V supply and still accept 5 V inputs?

Yes. The device supports VCC as low as 1.2 V while tolerating input voltages up to 5.5 V on all A-inputs and OE pins. This is achieved through internal input clamping and level-shifting circuitry, allowing direct connection to 5 V TTL outputs without external components - verified per datasheet Table 5 and Section 1. General description.

What is the purpose of the IOFF feature, and how does it behave during power-down?

IOFF disables all outputs and blocks current flow when VCC = 0 V, preventing backfeed current from live I/O lines into a powered-down system. Measured IOFF leakage is ±10 μA maximum (Table 9), ensuring safe hot-swap and partial power-down operation - a requirement explicitly cited in Section 1 and Table 6 of the datasheet.

Does 74LVC244ADB,112 include bus hold functionality?

No. Bus hold is exclusive to the 74LVCH244A variant (not this part). The 74LVC244A lacks internal bus hold resistors on data inputs; external pull-up/down resistors are required to maintain defined logic states on floating inputs - confirmed in Section 2 Features and benefits and Table 6 notes.

How does the Schmitt-trigger input improve noise immunity compared to standard CMOS inputs?

Schmitt-trigger inputs provide hysteresis (~0.3 V typical), meaning the threshold for rising-edge detection (V_T+) is higher than for falling-edge detection (V_T−). This prevents multiple toggles caused by slow or noisy edges - especially beneficial for mechanical switch debouncing or long PCB traces, as stated in Section 1 and validated in Figure 2 functional diagram.