STMicroelectronics 74LVXC3245MTR

Overview

74LVXC3245MTR from STMicroelectronics is an octal dual-supply bus transceiver enabling bidirectional level translation between 3.3V (A-port) and 5V (B-port) buses, with 8ns max propagation delay at VCCA=3.3V/VCCB=5.0V, ±24mA symmetrical drive strength, and 2kV ESD immunity-used in mixed-voltage industrial backplane interfaces and legacy-to-modern microcontroller interconnects.

For engineers reviewing the 74LVXC3245MTR datasheet, 74LVXC3245MTR pinout, 74LVXC3245MTR application, or 74LVXC3245MTR equivalent, key selection criteria include dual-rail voltage tolerance (2.7–3.6V / 2.7–5.5V), DIR-controlled directionality, G-enabled high-impedance isolation, and balanced tPLH/tPHL timing for synchronous data handshaking across voltage domains.

Technical Context

This IC implements asynchronous bidirectional data flow using a single DIR input to set transmission direction and an active-low G enable to place both ports in high-impedance state. It supports simultaneous A→B and B→A operation only when DIR is held static and G is asserted-no internal arbitration logic is present.

Its C2MOS process delivers low ICCA/ICCB (5µA max) while maintaining rail-to-rail I/O voltage compatibility: VIHA/VILB thresholds are defined separately per supply domain (e.g., VIHB = 3.85V min at VCCB = 5.5V), ensuring robust noise margins in mixed-supply systems.

Key Specifications

Pinout & Package

74LVXC3245MTR is housed in a 24-pin SOIC (Small Outline Integrated Circuit) package with 1.27mm pitch, 15.6mm length, and tape-and-reel packaging (MTR suffix). Pin 1 is marked by a bevelled corner; Pin 23 is NC (no connect); Pins 11–13 and 1 are ground/supply terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC4245APWR and TXB0108PWR, the 74LVXC3245MTR offers deterministic DIR-controlled timing, lowest quiescent current, and true independent dual-supply operation-making it optimal for fixed-direction, low-power, mixed-voltage industrial interfaces where timing predictability is critical.

Availability

74LVXC3245MTR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, legacy microcontroller expansion, and test equipment signal conditioning requiring stable component supply across extended temperature ranges (−55°C to +125°C).

Supply support for 74LVXC3245MTR 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 microcontrollers, power management, sensors, and analog ICs for industrial, automotive, and consumer markets.

The 74LVX series targets low-voltage, high-speed logic interfacing in mixed-supply systems, with the 74LVXC3245 specifically engineered for reliable 3.3V↔5V bidirectional data bridging in harsh environments.

FAQ

Can 74LVXC3245MTR operate with VCCA = 3.3V and VCCB = 2.7V?

Yes. The device supports VCCA from 2.7V to 3.6V and VCCB from 2.7V to 5.5V independently. At VCCA = 3.3V and VCCB = 2.7V, VIHB minimum becomes 2.0V (per Table 6), ensuring compatibility with 2.7V logic outputs on the B-port side. All DC and AC specs remain valid within this operating condition.

What happens to the outputs when G is HIGH and DIR is floating?

When G is HIGH, both A and B ports enter high-impedance (Z) state regardless of DIR state. DIR being floating does not affect output behavior in this condition. However, floating DIR may cause increased ICCtA due to input leakage; ST recommends tying DIR to VCCA or GND via a pull-up/down resistor for robust operation.

Is Pin 23 (NC) safe to connect to ground or leave unconnected?

Pin 23 is explicitly designated "Not Connected" in the datasheet and has no internal bond wire. It must remain unconnected - neither grounded nor tied to any voltage. Soldering or routing to ground risks mechanical stress on the die pad or unintended coupling through package parasitics.

Does 74LVXC3245MTR support hot insertion?

No. The device lacks hot-swap protection circuitry such as power-up sequencing control or bus-fault current limiting. Applying VCCA or VCCB while signals are driven can exceed absolute maximum ratings (e.g., VI/OA > VCCA + 0.5V), risking latch-up or permanent damage. Power supplies must be stabilized before asserting inputs.