Texas Instruments SN74AXC1T45DTQR

Overview

SN74AXC1T45 from Texas Instruments is a single-bit noninverting dual-supply bus transceiver enabling bidirectional voltage translation between 0.65 V and 3.6 V domains. It features independent A- and B-port supplies (VCCA, VCCB), DIR-controlled signal direction, VCC isolation, Ioff partial-power-down support, and operates across –40°C to +125°C - used in mixed-voltage processor-to-peripheral interconnects.

For engineers reviewing the SN74AXC1T45 datasheet, SN74AXC1T45 pinout, SN74AXC1T45 application, or SN74AXC1T45 equivalent, key selection criteria include configurable dual-rail operation, sub-10 ns propagation delay at 1.8V/3.3V, <10 µA quiescent current at 85°C, glitch-suppressed power sequencing, and high-impedance fail-safe behavior during supply brownout.

Technical Context

The SN74AXC1T45 implements a dual-supply level-shifting architecture where the A port tracks VCCA (0.65–3.6 V) and the B port tracks VCCB (0.65–3.6 V). Direction control is managed by the DIR input referenced to VCCA, with logic thresholds scaling with VCCA voltage.

Its VCC isolation feature disables both ports into high-impedance when either VCCA or VCCB falls below 100 mV. Glitch suppression circuitry ensures robust power-up/power-down sequencing, while Ioff protection limits leakage current during partial power-down states - critical for battery-backed or hot-pluggable systems.

Key Specifications

Pinout & Package

SN74AXC1T45 is packaged in DTQ (X2SON, 6-pin), measuring 1.0 mm × 0.8 mm - optimized for space-constrained portable and wearable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1T45DBVR and TXS0101DCKR, the SN74AXC1T45 uniquely supports sub-1 V operation, provides hardware-enforced VCC isolation, and delivers <10 ns delay at 3.3 V - making it the sole option for next-gen ultra-low-power, safety-aware, and mixed-voltage embedded interconnects.

Availability

SN74AXC1T45 is available at Aetrix Electronics and suitable for enterprise server management interfaces, industrial PLC I/O expansion, and personal electronics battery-powered subsystems requiring stable component supply across extended temperature and voltage ranges.

Supply support for SN74AXC1T45 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, embedded processing, and connectivity solutions with emphasis on reliability, precision, and energy efficiency.

The AXC family targets ultra-low-voltage, high-speed bidirectional translation for advanced node processors and heterogeneous SoCs - designed specifically for power-sensitive, thermally constrained, and mixed-domain system architectures.

FAQ

What is the minimum operating voltage for SN74AXC1T45 on the A port?

The SN74AXC1T45 supports VCCA as low as 0.65 V, enabling direct interface with sub-1 V logic such as ARM Cortex-M ultra-low-power cores or RISC-V accelerators. This specification is guaranteed across the full –40°C to +125°C temperature range and validated per TI's SCES882E datasheet Section 5.3.

Does SN74AXC1T45 require external pull-up or pull-down resistors on the A or B ports?

No - the SN74AXC1T45 does not require external biasing on A or B ports. However, unused inputs must be held at VCC or GND per TI Application Report SLVA675 to prevent floating nodes that could cause excessive ICC or metastability. The device itself contains no internal pull resistors.

How does the VCC isolation feature behave when VCCA = 0 V and VCCB = 1.8 V?

When VCCA falls below 100 mV (e.g., 0 V), the SN74AXC1T45 forces both A and B ports into high-impedance regardless of VCCB state. This prevents back-driving the 1.8 V domain and avoids contention on shared buses - a behavior confirmed in Section 7.3 of the SN74AXC1T45 datasheet and verified in functional testing at TI.

Can SN74AXC1T45 translate between 0.65 V and 3.3 V at 500 Mbps?

Yes - the SN74AXC1T45 supports up to 500 Mbps when translating from 1.8 V to 3.3 V, as stated in its Features list. At 0.65 V → 3.3 V, achievable data rate is lower due to reduced slew rate; actual timing must be validated using propagation delay tables (Section 5.6) and board-level signal integrity analysis.

Is SN74AXC1T45 pin-compatible with SN74AVC1T45?

No - SN74AXC1T45 is not pin-compatible with SN74AVC1T45. While both are single-bit translators in X2SON packages, SN74AVC1T45 uses a different pinout (e.g., DIR on Pin 2 vs. Pin 5 on SN74AXC1T45) and lacks VCC isolation and sub-0.8 V operation. PCB layout reuse is not possible without redesign.