Texas Instruments 74AVCH4T245PWTG4

Overview

74AVCH4T245PWTG4 from Texas Instruments is a 4-bit dual-supply noninverting bus transceiver with configurable level-shifting between 1.2V and 3.6V rails, 4.6V I/O tolerance, bus-hold circuitry, and 3-state outputs. It enables bidirectional voltage translation between mismatched logic domains (e.g., 1.2V ↔ 3.3V) in portable electronics and industrial control interfaces.

For engineers reviewing the 74AVCH4T245PWTG4 datasheet, 74AVCH4T245PWTG4 pinout, 74AVCH4T245PWTG4 application, or 74AVCH4T245PWTG4 equivalent, this device supports up to 380Mbps data rate (1.8V→3.3V), features Ioff for partial power-down, VCC isolation, and operates across –40°C to +85°C.

Technical Context

The 74AVCH4T245PWTG4 implements a fully configurable dual-rail architecture: A-port pins and control inputs (1DIR, 2DIR, 1OE, 2OE) are referenced to VCCA (1.2V–3.6V), while B-port pins track VCCB (1.2V–3.6V). Direction control is asynchronous per channel pair, with independent OE enable for each 2-bit section.

Its bus-hold circuitry actively sustains undriven inputs at valid logic levels without external resistors, and the Ioff feature disables outputs during power-down to prevent backflow current. VCC isolation ensures both ports enter high-impedance state if either VCCA or VCCB falls below 0.4V.

Key Specifications

Pinout & Package

Packaged in a 16-pin TSSOP (PW), 5mm × 6.4mm body with 0.65mm pitch; RoHS-compliant, lead-free, and halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC4T245PWR and TXS0104EPWR, the 74AVCH4T245PWTG4 uniquely supports true 1.2V–3.6V dual-rail translation with 380Mbps capability and integrated bus-hold - making it the only option for high-speed, ultra-low-voltage bidirectional bridging in portable and industrial systems.

Availability

74AVCH4T245PWTG4 is available at Aetrix Electronics and suitable for mobile baseband interfaces, industrial PLC I/O modules, enterprise SSD controller bridges, and automotive ADAS camera links requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 74AVCH4T245PWTG4 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 for industrial, automotive, personal electronics, and communications markets.

The SN74AVCH4T245 product line targets low-voltage bidirectional logic interfacing in space- and power-constrained systems, emphasizing voltage translation flexibility, robust ESD performance, and seamless integration into mixed-supply architectures.

FAQ

What voltage ranges does the 74AVCH4T245PWTG4 support on its A and B ports?

The 74AVCH4T245PWTG4 supports independent supply voltages from 1.2V to 3.6V on both VCCA (A port) and VCCB (B port). This allows translation between any combination of standard low-voltage nodes - including 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V - without external components. The 74AVCH4T245PWTG4 datasheet specifies absolute maximum ratings up to 4.6V on all I/O pins.

Does the 74AVCH4T245PWTG4 require external pull-up or pull-down resistors on its data lines?

No, the 74AVCH4T245PWTG4 integrates active bus-hold circuitry on all A- and B-port data inputs, which maintains undriven or floating lines at valid logic states. Using external pull resistors with the 74AVCH4T245PWTG4 is explicitly discouraged in the TI datasheet, as it conflicts with the internal bus-hold function and may increase power consumption or cause contention.

How does the 74AVCH4T245PWTG4 handle power sequencing when VCCA and VCCB ramp at different times?

The 74AVCH4T245PWTG4 includes VCC isolation: if either VCCA or VCCB falls below ~0.4V, both A and B ports automatically enter high-impedance state. This prevents false logic levels or back-current during asymmetric power-up/down sequences. For reliable startup, tie OE pins to VCCA via a pull-up resistor to ensure 3-state behavior until both supplies stabilize.

What is the maximum data rate supported by the 74AVCH4T245PWTG4, and under what conditions?

The 74AVCH4T245PWTG4 supports up to 380Mbps when translating from 1.8V to 3.3V (VCCA = 1.8V, VCCB = 3.3V). Lower rates apply for other combinations: 200Mbps for <1.8V→3.3V or →2.5V/1.8V, 150Mbps →1.5V, and 100Mbps →1.2V. These values are measured under specified load and transition conditions per the official TI SCES577F datasheet.

Can the 74AVCH4T245PWTG4 be used in automotive applications requiring AEC-Q100 qualification?

The 74AVCH4T245PWTG4 is not AEC-Q100 qualified. However, its –40°C to +85°C operating temperature range, 8kV HBM ESD rating, and Ioff partial-power-down capability make it suitable for non-safety-critical automotive subsystems (e.g., infotainment, camera links) when validated per customer-specific reliability requirements. For AEC-Q100-compliant alternatives, consult TI's automotive-grade portfolio.