Texas Instruments SN74LVCC4245ADBR

Overview

SN74LVCC4245ADBR 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, and robust glitch-free power sequencing. It serves as a critical interface IC in industrial motor control and power electronics where mixed-voltage bus isolation and reliable data direction control are required.

For engineers reviewing the SN74LVCC4245ADBR datasheet, SN74LVCC4245ADBR pinout, SN74LVCC4245ADBR application, or SN74LVCC4245ADBR equivalent, key selection considerations include its VCCA-referenced DIR/OE logic, Ioff partial-power-down protection, VCC isolation behavior (<100mV threshold), and compatibility with legacy SN74LVC4245 layouts in space-constrained TSSOP-24 designs.

Technical Context

The SN74LVCC4245ADBR implements asynchronous, noninverting bidirectional data transfer controlled by a single DIR input and active-low OE, with all control circuitry powered exclusively by VCCA. Its dual-rail architecture supports both A→B and B→A translation under independent supply conditions, while the VCC isolation feature forces both ports into high-impedance when either VCCA or VCCB drops below 100mV or floats.

It features Ioff circuitry that disables outputs during power-down to prevent backflow current, and its input thresholds (VIH/VIL) for DIR and OE are referenced strictly to VCCA-not VCCB-ensuring predictable control behavior even during asymmetric supply sequencing. The device meets JESD 17 latch-up immunity (>250mA) and JESD 22 ESD ratings (2000V HBM, 1000V CDM).

Key Specifications

Pinout & Package

SN74LVCC4245ADBR is packaged in a 24-pin TSSOP (PW) with 0.65mm pitch, measuring 9.7mm × 6.4mm, optimized for high-density industrial PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC4245APW and TXB0108PWR, the SN74LVCC4245ADBR uniquely delivers true dual-supply translation with guaranteed VCC isolation and industrial-grade drive strength - making it the only option among the three qualified for mixed-voltage industrial bus isolation with fail-safe power-down behavior.

Availability

SN74LVCC4245ADBR is available at Aetrix Electronics and suitable for industrial motor control, renewable energy inverters, and HVAC outdoor unit designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SN74LVCC4245ADBR 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 delivering analog and embedded processing solutions, with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74LVCC4245ADBR belongs to TI's LVCC logic family, engineered specifically for robust voltage translation in harsh industrial environments where supply sequencing faults, ESD events, and mixed-voltage interoperability must be addressed at the silicon level.

FAQ

What is the maximum allowable voltage difference between VCCA and VCCB for reliable operation of the SN74LVCC4245ADBR?

The SN74LVCC4245ADBR supports VCCA from 4.5V to 5.5V and VCCB from 2.7V to 5.5V independently. There is no specified maximum differential voltage limit between them - operation is valid whether VCCA = 5V and VCCB = 3.3V (1.7V difference) or both at 5V (0V difference). The device is designed to handle full-rail translation across this range without degradation, as confirmed in Section 5.3 Recommended Operating Conditions of the official datasheet.

Does the SN74LVCC4245ADBR support hot insertion or live board swapping?

Yes, the SN74LVCC4245ADBR supports hot insertion via its VCC isolation and Ioff features. When either VCCA or VCCB is disconnected or falls below 100mV, all I/Os enter high-impedance - preventing bus contention or back-driving. Combined with ±2µA Ioff leakage (Section 5.5), this ensures safe insertion/removal in powered backplanes. However, mechanical connector design and system-level sequencing must still comply with IEC 61000-4-2 for full hot-swap certification.

Can the DIR and OE inputs of the SN74LVCC4245ADBR be driven by a 3.3V microcontroller when VCCA is at 5V?

No - DIR and OE inputs are referenced strictly to VCCA (Section 10.3), so their VIH minimum is 2.0V at VCCA = 4.5–5.5V (Section 5.3). A 3.3V logic high meets this threshold, but the 3.3V source must be referenced to the same ground as VCCA and capable of sourcing sufficient current (±1µA max, Section 5.5). Direct connection is acceptable; no level shifter is needed as long as the 3.3V controller shares ground and meets VIH/VIL specs relative to VCCA.

What is the thermal performance of the SN74LVCC4245ADBR in its TSSOP-24 (PW) package?

In the PW (TSSOP-24) package, the SN74LVCC4245ADBR has RθJA = 100.6°C/W (Section 5.4). At 24mA drive per output and full 16-bit switching, typical power dissipation is ~20mW (Section 5.7), resulting in <2.1°C junction-to-ambient rise above ambient - well within safe limits. For continuous high-load operation, PCB copper area and airflow should still follow TI's layout guidelines in Section 11.4 to maintain reliability over temperature.

Is the SN74LVCC4245ADBR pin-compatible with the SN74LVC4245A in TSSOP-24 packages?

Yes - the SN74LVCC4245ADBR shares identical pinout, footprint, and pad layout with the SN74LVC4245APW (TSSOP-24), as explicitly stated in Section 11.1 Application Information. This allows direct PCB replacement without redesign, though SN74LVCC4245ADBR adds dual-supply translation and VCC isolation not present in the LVC variant. System validation is required to confirm timing and drive behavior under actual VCCA/VCCB conditions.