onsemi 74LVX240MTC

Overview

74LVX240MTC from Fairchild Semiconductor is a low-voltage octal inverting buffer/line driver with dual 3-STATE outputs, designed for memory address and clock distribution in mixed-voltage systems. It operates from 2.0V to 3.6V, tolerates 5.5V inputs, and delivers ±4mA output drive at 3.3V with propagation delay as low as 4.3ns (CL = 15pF).

For engineers reviewing the 74LVX240MTC datasheet, pinout, applications, or equivalent options, key selection criteria include 3.3V-compatible 3-STATE bus driving capability, 5V-tolerant inputs for 3V/5V interfacing, simultaneous switching noise performance, and TSSOP-20 packaging for high-density PCB layouts.

Technical Context

The 74LVX240MTC implements two independent 4-bit inverting buffer groups (I0–I3/O0–O3 and I4–I7/O4–O7), each controlled by separate 3-STATE enable inputs OE1 (pins 12,14,16,18) and OE2 (pins 3,5,7,9). Its input structure supports voltage translation: 5V logic inputs are safely accepted while operating from a 3.3V supply.

It features guaranteed dynamic threshold behavior and simultaneous switching noise immunity per JEDEC standards, with AC characteristics specified across −40°C to +85°C and VCC = 2.7V or 3.3V ±0.3V. Output disable timing (tPLZ/tPHZ) and enable timing (tPZL/tPZH) are separately characterized for controlled bus turnaround.

Key Specifications

Pinout & Package

74LVX240MTC is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4mm body width, 0.65mm lead pitch, with exposed pad not present. Pin numbering follows standard dual-in-line convention with pin 1 marked by dot or bevel.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVX240MTC, the 74LVC240PW offers faster speed but lacks input inversion, while SN74LV240APWR retains inversion and adds 5V supply flexibility and higher drive-both require layout review due to differing thermal pad presence and lead coplanarity specs.

Availability

74LVX240MTC is available at Aetrix Electronics and suitable for memory address buffering, clock distribution networks, and mixed-voltage bus interfacing requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant TSSOP packaging.

Supply support for 74LVX240MTC 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

Fairchild Semiconductor was a U.S.-based designer and manufacturer of analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and communications infrastructure.

The LVX logic family-including 74LVX240MTC-was engineered for low-voltage, low-noise 3.3V system interfacing with 5V-tolerant inputs, targeting high-density PCBs in telecom, computing, and industrial control.

FAQ

What is the maximum input voltage rating for 74LVX240MTC?

The 74LVX240MTC supports DC input voltages up to 5.5V regardless of VCC level, enabling safe interfacing with 5V logic families while operating from a 3.3V supply. This 5V-tolerance is explicitly guaranteed in the Absolute Maximum Ratings and DC Electrical Characteristics tables of the Fairchild datasheet DS011609, and does not require external clamping circuitry when used within recommended operating conditions.

Does 74LVX240MTC support true 3-STATE operation on all eight outputs?

Yes, 74LVX240MTC provides full 3-STATE control via two independent active-low enable inputs: OE1 controls outputs O0–O3, and OE2 controls O4–O7. When either OE is HIGH, its associated four outputs enter high-impedance state with off-state current ≤±0.25µA (max at VCC = 3.6V), verified per DC Electrical Characteristics. This allows flexible bus partitioning without contention.

What is the typical propagation delay of 74LVX240MTC at 3.3V supply?

At VCC = 3.3V ±0.3V and CL = 15pF, the 74LVX240MTC exhibits typical propagation delays of tPLH = 4.3ns and tPHL = 6.2ns, as specified in the AC Electrical Characteristics table. These values are measured under controlled load conditions and represent average performance across process/voltage/temperature corners, supporting reliable timing closure in sub-100MHz digital interfaces.

Is 74LVX240MTC pin-compatible with other 20-pin TSSOP octal buffers?

No, 74LVX240MTC is not universally pin-compatible with other 20-pin TSSOP octal buffers. While it shares the JEDEC MO-153 footprint (MTC20), its pinout-especially the placement of dual OE inputs (pins 3,5,7,9 and 12,14,16,18) and interleaved I/O assignment-is specific to the LVX240 function. Substitution requires verification of signal mapping, power/ground pin alignment, and enable logic polarity.

What package type does 74LVX240MTC use, and what are its key mechanical dimensions?

74LVX240MTC uses a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, with 4.4mm body width and 0.65mm lead pitch. It has no exposed thermal pad. The package drawing in the Fairchild datasheet DS011609 confirms total length of 6.5mm, height of 1.2mm max, and lead thickness of 0.15mm-critical for stencil design and reflow profile validation in automated assembly.