Texas Instruments SN74AVC32T245ZRLR

Overview

SN74AVC32T245ZRLR from Texas Instruments is a 32-bit dual-supply bus transceiver enabling bidirectional voltage translation between 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V domains. It features configurable A/B port supply rails (VCCA/VCCB), tri-state outputs with independent direction (DIR) and output-enable (OE) controls per channel group, and 4.6 V tolerant I/Os. It supports up to 380 Mbps data rate in 1.8 V → 3.3 V level-shifting mode and is used in high-density mixed-voltage interconnects for SoC-to-peripheral communication.

For engineers reviewing the SN74AVC32T245ZRLR datasheet, SN74AVC32T245ZRLR pinout, SN74AVC32T245ZRLR application, or SN74AVC32T245ZRLR equivalent, key selection criteria include dual-rail voltage flexibility (1.2–3.6 V per port), VCC isolation behavior, Ioff partial-power-down support, propagation delay consistency across supply combinations, and BGA MICROSTAR JUNIOR (96-pin) package compatibility with fine-pitch PCB routing.

Technical Context

The SN74AVC32T245ZRLR implements four independent 8-bit transceiver blocks (1–4), each with dedicated DIR and OE inputs referenced to VCCA. Control logic operates solely from VCCA, while data I/Os on A and B ports track their respective supply rails-enabling true asynchronous bidirectional translation without clock or timing coordination between domains.

VCC isolation ensures both ports enter high-impedance state if either VCCA or VCCB falls to GND, preventing backdrive current. The Ioff circuitry actively disables outputs during power-down, limiting leakage to ±5 µA when one rail is at 0 V and the other at up to 3.6 V-critical for hot-swap and partial-power-down system architectures.

Key Specifications

Pinout & Package

SN74AVC32T245ZRLR uses the BGA MICROSTAR JUNIOR package with 96 solder balls in an 8.50 mm × 3.50 mm body. Pin assignment follows a symmetrical 6×16 grid layout with dedicated VCCA/VCCB pairs per quadrant and grouped DIR/OE controls.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC16T245DGGR and TXB0304PWR, the SN74AVC32T245ZRLR uniquely delivers full 32-bit width, explicit DIR/OE control per octet, and BGA packaging optimized for high-speed, high-density mixed-voltage interconnects-making it irreplaceable in server, telecom, and ADAS applications requiring deterministic timing and scalable channel count.

Availability

SN74AVC32T245ZRLR is available at Aetrix Electronics and suitable for server memory interconnects, industrial PLC backplanes, and automotive ADAS domain controllers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.

Supply support for SN74AVC32T245ZRLR 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 over 90 years of innovation in high-reliability IC design.

The SN74AVC32T245ZRLR belongs to TI's Widebus+™ family of advanced bus interface devices, engineered specifically for low-voltage, high-speed, mixed-domain digital interconnects in enterprise computing, industrial automation, and communications infrastructure.

FAQ

What is the minimum operating voltage for SN74AVC32T245ZRLR on both VCCA and VCCB rails?

The SN74AVC32T245ZRLR supports a minimum supply voltage of 1.2 V on both VCCA and VCCB rails, enabling compatibility with ultra-low-voltage logic families such as LPDDR4 I/O and advanced SoC core domains. Operation below 1.2 V is not characterized or guaranteed per the datasheet.

Does SN74AVC32T245ZRLR support automatic direction sensing like the TXB series?

No, the SN74AVC32T245ZRLR requires explicit direction control via its four DIR inputs (1DIR–4DIR). Unlike auto-sensing translators, it provides deterministic, glitch-free direction switching synchronized to system control logic-essential for high-speed parallel buses where timing predictability is critical.

Can SN74AVC32T245ZRLR be used with VCCA = 1.8 V and VCCB = 3.3 V in both directions?

Yes, the SN74AVC32T245ZRLR fully supports bidirectional translation between VCCA = 1.8 V and VCCB = 3.3 V, delivering up to 380 Mbps in the 1.8 V → 3.3 V direction and 200 Mbps in the reverse direction, with verified VOH/VOL levels meeting both logic families' interface thresholds.

What is the thermal resistance (RθJA) of SN74AVC32T245ZRLR in its BGA MICROSTAR JUNIOR package?

The SN74AVC32T245ZRLR in the ZRL package has a junction-to-ambient thermal resistance (RθJA) of 105.8 °C/W under standard JEDEC test conditions. This value assumes a 2-layer board with 1 oz copper and no thermal vias; actual performance improves significantly with proper thermal pad design and PCB copper pour.

How does the VCC isolation feature behave if VCCA is powered but VCCB is disconnected?

If VCCB is disconnected (i.e., at GND potential) while VCCA remains powered, the VCC isolation feature forces both A and B ports into high-impedance state-preventing current backflow from the active A-side into the unpowered B-side. This behavior is guaranteed across the full operating temperature range and eliminates risk of damage during asymmetric power sequencing.