onsemi MC74LCX244MN2TWG

Overview

MC74LCX244MN2TWG from onsemi is a low-voltage CMOS octal non-inverting 3-state buffer with 5 V-tolerant inputs and outputs, operating from 1.65 V to 5.5 V supply. It delivers ±24 mA output drive, features 5.5 V absolute input voltage rating, and exhibits near-zero static supply current (10 µA) in all logic states. It is used for memory address driving and TTL-level bus interfacing in mixed-voltage systems.

For engineers reviewing the MC74LCX244MN2TWG datasheet, pinout, applications, or equivalent options, key selection criteria include 5 V tolerance on I/O, QFN-20 2.5×3.5 mm package compatibility, 3-state enable timing (tPZH/tPHZ ≤ 7.3 ns at 5 V), and industrial temperature range (−55 °C to +125 °C).

Technical Context

The MC74LCX244MN2TWG implements dual 4-bit non-inverting buffers with independent 3-state control via two OE inputs (1OE, 2OE). Each buffer group drives four outputs (1O0–1O3, 2O0–2O3) from corresponding inputs (1D0–1D3, 2D0–2D3), enabling bidirectional bus isolation.

Its 5 V-tolerant I/O architecture allows safe interfacing with legacy 5 V TTL logic while powered from 1.65–5.5 V supplies. The IOFF specification guarantees high-impedance outputs when VCC = 0 V, supporting live insertion and hot-swap applications without back-driving.

Key Specifications

Pinout & Package

MC74LCX244MN2TWG uses a 20-pin QFN package (Case 485CB), measuring 2.5 mm × 3.5 mm with 0.4 mm pitch and an exposed thermal pad. The package is Pb-free, halogen-free, and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC244APWR and 74ALVC244MTCX, MC74LCX244MN2TWG uniquely supports true 5 V-tolerant I/O at up to 5.5 V supply, enabling drop-in replacement in legacy 5 V bus designs without redesign, while delivering balanced ±24 mA drive and extended temperature operation.

Availability

MC74LCX244MN2TWG is available at Aetrix Electronics and suitable for memory address buffering, industrial bus transceivers, hot-swappable backplane interfaces, and automotive powertrain sensor hubs requiring stable component supply across extended temperature ranges.

Supply support for MC74LCX244MN2TWG 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient technologies for automotive, industrial, cloud, medical, and IoT applications.

The MC74LCX244MN2TWG belongs to the LCX low-voltage CMOS logic family, designed specifically for mixed-voltage system interfacing with robust 5 V tolerance, live-insertion support, and extended temperature reliability.

FAQ

What is the maximum supply voltage for MC74LCX244MN2TWG?

The absolute maximum DC supply voltage (VCC) for MC74LCX244MN2TWG is +6.5 V, but the recommended operating range is 1.65 V to 5.5 V. Operation above 5.5 V voids guaranteed performance and may impact long-term reliability. All electrical characteristics in the datasheet are validated within the 1.65–5.5 V range, and the device's 5 V-tolerant I/O remains functional up to 6.5 V input voltage regardless of VCC setting.

Does MC74LCX244MN2TWG support hot-swap applications?

Yes, MC74LCX244MN2TWG supports hot-swap applications due to its IOFF specification, which guarantees high-impedance outputs when VCC = 0 V. This prevents back-driving of powered circuitry during live insertion or withdrawal. Combined with 5 V-tolerant I/O and ESD protection (>2000 V HBM), it meets key requirements for backplane and modular system designs where cards are replaced without powering down the host system.

What is the pin pitch and thermal pad configuration of the MC74LCX244MN2TWG package?

MC74LCX244MN2TWG uses a QFN-20 package (Case 485CB) with 0.4 mm pin pitch, 2.5 mm × 3.5 mm body dimensions, and an exposed thermal pad centered on the bottom surface. The thermal pad must be soldered to a PCB copper pour for thermal dissipation and mechanical stability. Footprint recommendations specify 2.24 mm pad length and 0.25 mm solder mask opening per terminal per onsemi's Soldering and Mounting Techniques Reference Manual.

Can MC74LCX244MN2TWG drive standard TTL loads directly?

Yes, MC74LCX244MN2TWG can drive standard TTL loads directly because its outputs are LVTTL-compatible and provide ±24 mA drive strength - exceeding the ±0.4 mA sink/source requirement of standard TTL inputs. Its VOH ≥ VCC − 0.1 V and VOL ≤ 0.55 V at 24 mA ensure valid logic levels across the full 1.65–5.5 V supply range, eliminating the need for pull-up resistors or additional buffering in most TTL interface scenarios.

Is MC74LCX244MN2TWG qualified for automotive applications?

MC74LCX244MN2TWG itself is not AEC-Q100 qualified; however, the pin-compatible variant MC74LCX244DTR2G-Q (TSSOP-20) carries the −Q suffix and is AEC-Q100 qualified and PPAP capable. For automotive powertrain or chassis applications requiring formal qualification, that variant should be selected. MC74LCX244MN2TWG remains suitable for non-safety-critical automotive infotainment or body electronics where extended temperature operation (−55 °C to +125 °C) and robustness are valued but formal AEC-Q100 certification is not mandated.