Texas Instruments SN74LVCC4245ADW

Overview

SN74LVCC4245ADW from Texas Instruments is an octal dual-supply bus transceiver enabling bidirectional voltage-level translation between 5V (A port, VCCA = 4.5–5.5V) and 3.3V/5V (B port, VCCB = 2.7–5.5V) buses, with 24mA output drive at 3V, 3-state control via OE, and direction control via DIR. It supports asynchronous data exchange in industrial power electronics such as servo drive modules and string inverters.

For engineers reviewing the SN74LVCC4245ADW datasheet, SN74LVCC4245ADW pinout, SN74LVCC4245ADW application, or SN74LVCC4245ADW equivalent, key selection criteria include its VCC isolation feature, glitch-free power sequencing, Ioff partial-power-down support, and compatibility with legacy SN74LVC4245 layouts.

Technical Context

The SN74LVCC4245ADW implements a noninverting 8-bit transceiver architecture with independent A- and B-port supply rails (VCCA and VCCB), where control logic (DIR, OE) is referenced solely to VCCA. Its direction-controlled data flow enables A→B or B→A transmission without internal latching or clocking.

VCC isolation ensures both I/O ports enter high-impedance state if either VCCA or VCCB falls below 100mV or floats; Ioff circuitry prevents backflow current during partial power-down. Input thresholds for DIR/OE are VCCA-referenced, while B-port I/O levels track VCCB, enabling robust 3.3V↔5V translation.

Key Specifications

Pinout & Package

DW package: SOIC-24, 15.5mm × 10.3mm body, surface-mount, standard footprint compatible with legacy '245 devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC4245ADW and TXB0108PWR, the SN74LVCC4245ADW uniquely combines explicit DIR/OE control, 24mA drive across full VCCB range, and guaranteed VCC isolation - making it optimal for deterministic, high-noise industrial bus interfaces requiring robust power sequencing.

Availability

SN74LVCC4245ADW is available at Aetrix Electronics and suitable for PLC backplanes, servo drive power stages, string inverter communication modules, air conditioner outdoor unit controllers, and three-phase UPS systems requiring stable component supply across extended temperature and mixed-voltage operation.

Supply support for SN74LVCC4245ADW 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of experience in industrial-grade interface solutions.

The SN74LVCC4245ADW belongs to TI's LVCC logic family, designed specifically for robust voltage translation in harsh industrial environments where power sequencing reliability, ESD resilience, and mixed-voltage interoperability are critical.

FAQ

What is the maximum allowable voltage difference between VCCA and VCCB for reliable operation of the SN74LVCC4245ADW?

The SN74LVCC4245ADW supports VCCA from 4.5V to 5.5V and VCCB from 2.7V to 5.5V, permitting up to a 2.8V differential (e.g., VCCA = 5.5V, VCCB = 2.7V). This range is validated per TI's recommended operating conditions and ensures correct logic thresholds, output drive, and isolation behavior. Operation outside this window risks undefined I/O states or excessive leakage, so the SN74LVCC4245ADW must be applied within these bounds.

Does the SN74LVCC4245ADW require external pull-up or pull-down resistors on DIR or OE inputs?

No, the SN74LVCC4245ADW does not require external biasing on DIR or OE - its control inputs have defined VIH and VIL thresholds referenced to VCCA (e.g., VIH = 2.0V min at VCCA = 4.5V). However, TI recommends tying unused control inputs directly to VCCA or GND to prevent floating states that could cause erratic direction or enable behavior. The SN74LVCC4245ADW's internal structure avoids reliance on external resistors for basic functionality.

How does the VCC isolation feature behave when VCCA is powered but VCCB is disconnected in the SN74LVCC4245ADW?

When VCCB is disconnected (floating) or drops below 100mV while VCCA remains powered, the SN74LVCC4245ADW automatically forces both A-port and B-port I/Os into high-impedance state - regardless of DIR or OE logic levels. This VCC isolation prevents back-driving or contention on the B bus. The SN74LVCC4245ADW achieves this via internal sensing circuitry tied to VCCB, ensuring fail-safe behavior during partial power loss.

Can the SN74LVCC4245ADW be used for 5V-to-5V bidirectional buffering without level translation?

Yes, the SN74LVCC4245ADW supports 5V-to-5V operation by setting both VCCA and VCCB to 5V (within 4.5–5.5V range). In this configuration, it functions as a high-drive (±24mA), 3-state octal buffer with direction control - offering stronger drive and better noise immunity than standard LVC '245 devices. All timing, isolation, and Ioff features remain fully active, making the SN74LVCC4245ADW suitable for demanding 5V bus isolation tasks.

What thermal derating applies to the SN74LVCC4245ADW in a DW (SOIC-24) package at 85°C ambient?

In the DW package, the SN74LVCC4245ADW has θJA = 46°C/W. At TA = 85°C and maximum power dissipation (calculated from ICCA + ICCB ≈ 33µA typical + dynamic Cpd × f × V²), junction temperature remains well below 125°C - no derating required for continuous operation. TI specifies full performance across –40°C to +85°C ambient, and the SN74LVCC4245ADW's low quiescent current and efficient CMOS design ensure thermal safety without forced airflow or heatsinking in standard PCB layouts.