STMicroelectronics 74LVX245MTR

Overview

74LVX245MTR from STMicroelectronics is a low-voltage CMOS octal bus transceiver (3-state) with 5V-tolerant inputs, operating from 2V to 3.6V supply. It provides bidirectional data flow between two 8-bit buses controlled by DIR and G inputs, delivers 4.7ns typical propagation delay at 3.3V, supports 4mA symmetrical output drive, and features power-down input protection enabling safe 0–7V input acceptance regardless of VCC. It is used in 3.3V/5V mixed-voltage system interfacing, such as FPGA-to-microcontroller data bridges.

For engineers reviewing the 74LVX245MTR datasheet, 74LVX245MTR pinout, 74LVX245MTR application, or 74LVX245MTR equivalent, key selection criteria include 5V-tolerant input compatibility, 3.3V operation with sub-5ns timing, 3-state bus isolation behavior, and SO-20 package mechanical fit for legacy 74-series board layouts.

Technical Context

The device implements asynchronous bidirectional bus communication using a single DIR control line to determine data direction (A→B or B→A), while the active-low G input enables/disables all outputs into high-impedance state. Its input structure includes clamping diodes and ESD protection, allowing 0–7V input voltage range independent of VCC - critical for level-shifting between 5V peripherals and 3.3V logic.

It uses sub-micron C2MOS technology to achieve true CMOS low quiescent current (4µA max) alongside high-speed performance. Propagation delays tPLH and tPHL are balanced (≈4.7ns typ. at 3.3V), and output skew is limited to 1.5ns max, ensuring deterministic timing across all eight channels under load.

Key Specifications

Pinout & Package

74LVX245MTR is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package, 7.6mm wide, with 1.27mm pitch, compliant with JEDEC MS-013. Pin 1 is marked by a beveled corner or dot; pin 10 is GND, pin 20 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVC245ADTR and SN74AVC8T245RHLR, the 74LVX245MTR uniquely combines 7V input tolerance, 4.7ns timing, and zero-external-component 3-state control - making it optimal for robust, fixed-direction mixed-voltage interconnects where reliability trumps marginal speed gain.

Availability

74LVX245MTR is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA-to-ASIC data bridges, and portable medical device bus isolation requiring stable component supply across extended temperature ranges (–55°C to +125°C).

Supply support for 74LVX245MTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs, with strong heritage in analog, mixed-signal, and discrete technologies.

The 74LVX series was designed specifically for low-voltage, low-noise, battery-operated 3.3V systems requiring interoperability with legacy 5V logic - emphasizing ESD robustness, power-down safety, and timing predictability.

FAQ

Can 74LVX245MTR operate with VCC = 2.5V and still meet timing specifications?

Yes. The device is fully specified from 2.0V to 3.6V. At VCC = 2.5V, tPLH/tPHL increases to ≤13.5ns (max) with CL = 15pF, and output drive remains ≥4mA. VIH/VIL thresholds scale proportionally, maintaining reliable logic interpretation across the full operating range.

What happens to inputs when VCC = 0V?

Inputs remain protected and non-latching due to built-in power-down protection circuitry. The device accepts 0–7V on all inputs regardless of VCC state, preventing backfeeding, latch-up, or damage during hot-swap or unpowered insertion - a key feature for modular system architectures.

Is the SO-20 package of 74LVX245MTR RoHS-compliant and lead-free?

Yes. Per STMicroelectronics documentation (Doc ID 12125, Rev 5), the 74LVX245MTR in SO-20 tape-and-reel packaging is RoHS-compliant and lead-free, with matte tin finish on leads and halogen-free molding compound, meeting JEDEC J-STD-020 moisture sensitivity level 3.

How does the 74LVX245MTR handle floating bus lines in high-impedance state?

All A and B bus terminals must be externally held HIGH or LOW during high-Z state - no internal pull-ups or pull-downs are provided. Uncontrolled floating lines can cause increased ICC, noise coupling, or undefined logic states; design requires external termination (e.g., 10kΩ to VCC or GND) on unused or unterminated bus segments.