NXP Semiconductors 74LVT244APW,112

Overview

74LVT244APW,112 from Nexperia is a 3.3 V octal 3-state buffer/line driver in TSSOP20 package, featuring dual independent 4-bit channels with active-low output enables (1OE, 2OE), ±32 mA/±64 mA drive capability, and bus-hold inputs eliminating external pull-ups. It operates across -40 °C to +85 °C and interfaces directly with TTL logic while tolerating 5.5 V inputs - used in high-density board-level data routing between FPGAs and peripheral buses.

For engineers reviewing the 74LVT244APW,112 datasheet, 74LVT244APW,112 pinout, 74LVT244APW,112 application, or 74LVT244APW,112 equivalent, key selection criteria include its 2.7–3.6 V supply range, 2.5 ns typical propagation delay at 3.3 V, IOFF power-down protection, overvoltage-tolerant inputs, and live-insertion support for hot-swap backplane designs.

Technical Context

This BiCMOS 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 bus-hold circuitry actively maintains input logic states without external resistors, reducing BOM count and PCB footprint.

The IC supports partial power-down via IOFF circuitry that disables output leakage when VCC = 0 V, and features overvoltage-tolerant inputs rated to 5.5 V - enabling safe interfacing with 5 V legacy systems while powered from 3.3 V rails. Propagation delays are tightly specified: tPLH/tPHL ≤ 4.1 ns at 3.3 V, with 3-state enable/disable times ≤ 5.6 ns.

Key Specifications

Pinout & Package

TSSOP20 package (SOT360-1): 20-terminal plastic thin shrink small outline, 4.4 mm body width, 0.65 mm lead pitch, 0.85 mm max height - optimized for high-density PCB layouts with thermal enhancement via exposed pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC244APWR, the 74LVT244APW,112 delivers higher drive strength and integrated bus-hold, reducing component count; versus 74LVCH244APW, it lacks Schmitt inputs but offers identical timing and lower input capacitance (4 pF vs 5 pF), favoring high-speed clean-signal routing.

Availability

74LVT244APW,112 is available at Aetrix Electronics and suitable for industrial backplane interconnects, FPGA I/O expansion, PCIe add-in card interfaces, and embedded controller local bus isolation requiring stable component supply and long-term lifecycle assurance.

Supply support for 74LVT244APW,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-performance, high-reliability logic, analog, and MOSFET solutions - delivering energy-efficient components for automotive, industrial, and consumer electronics.

The 74LVT series targets high-speed 3.3 V digital interfacing with emphasis on robustness, low skew, and compatibility with legacy 5 V systems - designed specifically for board-level signal integrity in dense, mixed-voltage systems.

FAQ

Can 74LVT244APW,112 safely interface with 5 V microcontroller outputs?

Yes - its inputs tolerate up to 5.5 V regardless of VCC voltage, allowing direct connection to 5 V TTL or CMOS outputs without level-shifting circuitry. This is verified in Table 4 (Limiting Values) and Table 5 (Operating Conditions) of the Nexperia datasheet Rev. 8, where VI(max) = +7.0 V and recommended VI range extends to 5.5 V.

Does this device require external pull-up resistors on unused inputs?

No - the 74LVT244APW,112 integrates bus-hold circuitry on all data inputs (1A0–1A3, 2A0–2A3), actively retaining the last valid logic state. This eliminates the need for external pull-up or pull-down resistors, confirmed in Section 1 (General Description) and Table 6 (Static Characteristics) where IBHL and IBHH currents are specified.

What is the maximum clock/data rate supported by this buffer?

While not a clock device, its 2.5 ns typical propagation delay (tPLH/tPHL at VCC = 3.3 V) supports reliable operation in data paths up to ~200 MHz, assuming proper PCB layout and load capacitance ≤ 50 pF. This is derived from Table 7 (Dynamic Characteristics) and validated under conditions in Table 9 (Test Data) with 10 MHz input frequency and 500 ns pulse width.

Is the TSSOP20 package thermally enhanced?

Yes - the SOT360-1 (TSSOP20) package features an exposed thermal pad on the underside (non-electrical), enabling improved heat dissipation. Though not soldered to ground per default, thermal vias to internal ground planes are recommended for sustained 64 mA output loading, as noted in the package outline documentation (Fig. 7) and thermal characterization guidance in Nexperia's application notes.