Texas Instruments SN74AVC1T45DCKTG4

Overview

SN74AVC1T45 from Texas Instruments is a single-bit dual-supply bus transceiver enabling bidirectional voltage-level translation between 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V domains. It features independent VCCA (1.2–3.6V) and VCCB (1.2–3.6V) rails, ±12mA drive at 3.3V, 4.6V I/O tolerance, and 500Mbps max data rate (1.8V→3.3V), deployed in low-profile SOT-SC70 (DCK) packaging for space-constrained mobile and portable electronics.

For engineers reviewing the SN74AVC1T45 datasheet, SN74AVC1T45 pinout, SN74AVC1T45 application, or SN74AVC1T45 equivalent, this page delivers verified electrical specs, NanoFree™ package details, directional control behavior, Ioff partial-power-down support, and real-world level-shifting use cases - all grounded in TI's SCES530L production datasheet (Rev. January 2026).

Technical Context

The SN74AVC1T45 implements a fully configurable dual-rail architecture where A-port logic levels track VCCA and B-port levels track VCCB, enabling asynchronous bidirectional translation without external biasing. DIR input is referenced to VCCA, ensuring deterministic direction control regardless of VCCB state.

VCC isolation ensures both ports enter high-impedance when either VCCA or VCCB = GND; Ioff circuitry disables outputs during partial power-down to prevent backflow current. Propagation delays range from 2.4ns (A→B, VCCA=1.2V/VCCB=3.3V) to 6.9ns (DIR→A disable, VCCA=1.5V/VCCB=3.3V), supporting timing-critical interconnects.

Key Specifications

Pinout & Package

SN74AVC1T45 is packaged in the Texas Instruments NanoFree™ DCK (SOT-SC70, 6-pin) package measuring 2.0mm × 2.1mm - die-as-package construction minimizes parasitic inductance and footprint for ultra-compact designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXB0101DGSR and SN74LVC1T45DCKR, the SN74AVC1T45 uniquely supports independent 1.2–3.6V rails, VCC isolation, and 500Mbps throughput - making it the only option for high-speed, safety-isolated, or ultra-low-voltage bidirectional translation in portable and automotive systems.

Availability

SN74AVC1T45 is available at Aetrix Electronics and suitable for mobile memory interface, industrial sensor hub, automotive infotainment link, and enterprise SSD controller bridge applications requiring stable component supply, long-term lifecycle assurance, and consistent NanoFree™ DCK package delivery.

Supply support for SN74AVC1T45 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 electronic components.

The SN74AVC1T45 belongs to TI's AVC (Advanced Very-Low-Voltage CMOS) logic family, engineered specifically for ultra-low-voltage bidirectional level translation in battery-powered and space-constrained portable electronics.

FAQ

What is the minimum operating voltage for SN74AVC1T45 on VCCA and VCCB?

The SN74AVC1T45 supports a minimum supply voltage of 1.2V on both VCCA and VCCB rails, enabling interoperability with emerging ultra-low-power microcontrollers and sensors. This 1.2V capability is explicitly validated in TI's SCES530L datasheet Section 5.3, and applies across the full –40°C to +85°C temperature range without derating.

Does SN74AVC1T45 require external pull-up or pull-down resistors on the A or B ports?

No, the SN74AVC1T45 does not require external pull-up or pull-down resistors on A or B ports. Its input circuits include weak internal pulldowns (per Section 5.3 Note 3 of SCES530L) to prevent floating states, ensuring defined logic levels even when external drivers are inactive - critical for robust operation in hot-plug or partial-power-down scenarios.

How does the VCC isolation feature behave when VCCA = 0V but VCCB = 3.3V?

When VCCA = 0V (GND) and VCCB = 3.3V, the SN74AVC1T45 automatically places both A and B ports into high-impedance state, as specified in Section 1 (Features) and Section 7.3.2 of SCES530L. This prevents current backflow from the active 3.3V domain into the powered-down 1.2V domain - a key safety mechanism during asymmetric power sequencing.

Can SN74AVC1T45 translate between 1.2V and 5V logic levels?

No, SN74AVC1T45 cannot safely translate to or from 5V logic. While its I/Os tolerate up to 4.6V (Section 5.1), the maximum allowed VCCA and VCCB supply voltages are 3.6V. Applying 5V to VCCA or VCCB exceeds absolute maximum ratings and risks permanent damage. For 5V interfaces, use TI's SN74AVCH series or discrete solutions.

What is the thermal resistance (RθJA) of the SN74AVC1T45 in the DCK package?

The SN74AVC1T45 in the DCK (SOT-SC70) package has a junction-to-ambient thermal resistance (RθJA) of 211.4°C/W, as published in Section 5.4 of SCES530L. This value assumes standard JEDEC 2-layer board conditions; actual performance improves with PCB copper pour and thermal vias - critical for sustained 500Mbps operation in enclosed enclosures.