Texas Instruments SN74LVCC4245ADBRE4

Overview

SN74LVCC4245ADBRE4 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), with 24mA drive strength at 3V, 3-state outputs controlled by DIR/OE, and robust glitch-free power sequencing. It serves in industrial motor control interfaces where mixed-voltage bus isolation and high-drive signal integrity are critical.

For engineers reviewing the SN74LVCC4245ADBRE4 datasheet, SN74LVCC4245ADBRE4 pinout, SN74LVCC4245ADBRE4 application, or SN74LVCC4245ADBRE4 equivalent, this page delivers verified electrical parameters, functional mode mapping, thermal performance data, Ioff-enabled partial-power-down behavior, and real-world implementation guidance for mixed-rail embedded systems.

Technical Context

The SN74LVCC4245ADBRE4 implements a noninverting, direction-controlled transceiver architecture with separate VCCA (5V domain) and VCCB (configurable 2.7–5.5V domain) rails. Control logic (DIR, OE) is referenced to VCCA, ensuring consistent enable/disable thresholds regardless of VCCB level.

Its VCC isolation feature forces both A and B ports into high-impedance when either VCCA or VCCB drops below 100mV or floats, preventing backfeed and latch-up. The device supports asynchronous bidirectional data flow - A→B when DIR = HIGH, B→A when DIR = LOW - with propagation delays as low as 1ns (tPLH/tPHL, CL = 50pF, VCCA = 5V, VCCB = 5V).

Key Specifications

Pinout & Package

SN74LVCC4245ADBRE4 is packaged in a 24-pin SSOP (DB) package measuring 8.2mm × 7.8mm, with gull-wing leads and 0.65mm pitch, optimized for automated SMT assembly and thermal dissipation in dense industrial PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC4245ADBR and TXB0108PWR, SN74LVCC4245ADBRE4 uniquely combines explicit DIR control, dual-rail isolation, and industrial-grade sequencing robustness - making it the only choice for safety-critical, mixed-voltage industrial bus isolation where deterministic control and fault containment are mandatory.

Availability

SN74LVCC4245ADBRE4 is available at Aetrix Electronics and suitable for servo drive power stages, three-phase UPS controllers, and air conditioner outdoor unit designs requiring stable component supply, long-term industrial lifecycle support, and guaranteed traceable sourcing.

Supply support for SN74LVCC4245ADBRE4 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 delivering high-reliability components for industrial, automotive, and communications markets.

SN74LVCC4245ADBRE4 belongs to TI's LVCC logic family, engineered specifically for robust voltage translation in harsh industrial environments - emphasizing glitch-free sequencing, VCC isolation, and extended temperature operation.

FAQ

What is the maximum supported data rate for SN74LVCC4245ADBRE4 in a 5V-to-3.3V translation configuration?

SN74LVCC4245ADBRE4 supports data rates up to ~100MHz in typical 5V-to-3.3V translation setups, based on its worst-case propagation delay of 7.4ns (tPHZ, VCCA = 5V, VCCB = 3.3V, CL = 50pF). Real-world throughput depends on trace length, load capacitance, and slew-rate constraints - design validation using the device's switching characteristics table is recommended before finalizing timing budgets for SN74LVCC4245ADBRE4.

Does SN74LVCC4245ADBRE4 require external pull-up or pull-down resistors on DIR or OE inputs?

No, SN74LVCC4245ADBRE4 does not require external biasing on DIR or OE - these inputs are CMOS with defined VIH/VIL thresholds referenced to VCCA (e.g., VIH = 2.0V min at VCCA = 4.5V). However, TI strongly recommends tying all unused inputs (including DIR/OE if fixed-function) to VCCA or GND to prevent floating states that could cause undefined operation or increased current consumption in SN74LVCC4245ADBRE4.

Can SN74LVCC4245ADBRE4 operate with VCCB = 2.7V while VCCA = 5.5V, and what impact does this have on drive strength?

Yes, SN74LVCC4245ADBRE4 is fully specified for VCCB = 2.7V and VCCA = 5.5V simultaneously. At this condition, high-level output current (IOH) is guaranteed ≥–12mA (min) and low-level output current (IOL) ≥12mA (min) - sufficient for driving standard 3.3V LVTTL loads. Full ±24mA drive is achieved at VCCB ≥ 3.0V, as confirmed in SN74LVCC4245ADBRE4's Electrical Characteristics table.

How does the VCC isolation feature behave if VCCA is powered but VCCB is disconnected (open-circuit)?

When VCCB is left floating (disconnected) while VCCA remains powered, SN74LVCC4245ADBRE4 detects VCCB < 100mV and forces both A and B ports into high-impedance - effectively isolating the buses. This prevents backfeeding from the A port into the unpowered B-side circuitry. The same behavior occurs if VCCA is floated while VCCB is active, confirming true bidirectional isolation in SN74LVCC4245ADBRE4.

Is SN74LVCC4245ADBRE4 pin-compatible with SN74LVC4245ADBR, and can they share the same PCB footprint?

Yes, SN74LVCC4245ADBRE4 and SN74LVC4245ADBR share identical 24-pin SSOP (DB) packaging, pin numbering, and mechanical dimensions (8.2mm × 7.8mm), enabling direct PCB footprint reuse. However, functional compatibility requires verifying VCCB connection: SN74LVC4245ADBR ties VCCB to VCCA internally and operates only at 3.3V, whereas SN74LVCC4245ADBRE4 requires external VCCB routing - board-level redesign is needed to support dual-rail operation in SN74LVCC4245ADBRE4.