Texas Instruments SN74AVCH20T245KR

Overview

SN74AVCH20T245KR from Texas Instruments is a 20-bit dual-rail noninverting bus transceiver enabling bidirectional voltage-level translation between 1.2-V to 3.6-V domains. It features independent VCCA and VCCB rails, Ioff partial-power-down support, VCC isolation, and 4.6-V tolerant I/Os. Used in mixed-voltage FPGA-to-ASIC interconnects, memory expansion interfaces, and low-power SoC subsystem bridging.

For engineers reviewing the SN74AVCH20T245KR datasheet, SN74AVCH20T245KR pinout, SN74AVCH20T245KR application, or SN74AVCH20T245KR equivalent, key selection criteria include its 20-bit dual-directional translation capability, bus-hold inputs eliminating external resistors, guaranteed 120 Mbps at 1.5-V translation, and VFBGA (GQL) package compatibility with high-density PCB layouts.

Technical Context

The SN74AVCH20T245KR implements two independent 10-bit transceiver sections (1A↔1B and 2A↔2B), each with dedicated DIR and OE controls referenced to VCCA. Its fully configurable dual-rail architecture allows simultaneous operation across mismatched supply domains - e.g., 1.8-V A-side interfacing to 3.3-V B-side - without level-shifting components.

VCC isolation ensures both ports enter high-impedance when either VCCA or VCCB is at GND, while Ioff circuitry prevents backflow current during power sequencing. Bus-hold circuitry actively maintains valid logic states on undriven inputs, and control inputs (DIR/OE) are overvoltage-tolerant up to 4.6 V regardless of rail voltage.

Key Specifications

Pinout & Package

VFBGA-56 (GQL) package, 3.5 mm × 4.5 mm, 0.5-mm pitch, 1.2-mm max height, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH16T245DGGR and SN74LVC245APWR, the SN74AVCH20T245KR provides 20-bit capacity in a compact VFBGA, full dual-rail flexibility, and system-level safety features (VCC isolation, Ioff, bus-hold) essential for modern multi-domain embedded systems - making it the only option supporting simultaneous 1.2-V ↔ 3.3-V translation with guaranteed 380 Mbps performance.

Availability

SN74AVCH20T245KR is available at Aetrix Electronics and suitable for FPGA interconnects, memory expansion subsystems, and automotive domain controller bridging requiring stable component supply across extended temperature ranges (−40°C to 85°C).

Supply support for SN74AVCH20T245KR 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 for industrial, automotive, and personal electronics markets.

The SN74AVCH20T245KR belongs to TI's AVC family of advanced voltage-translating transceivers, designed specifically for high-speed, low-power, mixed-voltage system integration in space-constrained and thermally demanding applications.

FAQ

What voltage ranges does the SN74AVCH20T245KR support on its A and B ports?

The SN74AVCH20T245KR supports independent supply voltages from 1.2 V to 3.6 V on both VCCA (A port) and VCCB (B port), enabling translation between any combination of 1.2-V, 1.5-V, 1.8-V, 2.5-V, and 3.3-V domains. The device remains operational down to 1.2 V on either rail, and all I/Os tolerate up to 4.6 V regardless of rail voltage - a key feature confirmed in the SCES567F datasheet absolute maximum ratings table.

Does the SN74AVCH20T245KR require external pullup or pulldown resistors on its data inputs?

No, the SN74AVCH20T245KR integrates active bus-hold circuitry on all data inputs (1A1–1A10, 2A1–2A10, 1B1–1B10, 2B1–2B10), which maintains valid logic states on undriven or floating lines. This eliminates the need for external pullup or pulldown resistors, reducing BOM count and PCB area - a design advantage explicitly stated in the device description and electrical characteristics section of the SCES567F datasheet.

How does the VCC isolation feature function in the SN74AVCH20T245KR?

The VCC isolation feature in the SN74AVCH20T245KR ensures that if either VCCA or VCCB is driven to GND, both A-side and B-side outputs automatically enter a high-impedance state - regardless of DIR or OE logic levels. This behavior is hardware-enforced and prevents unintended signal contention or backdrive during power sequencing, hot-swap events, or rail failure. It is documented in the functional description and absolute maximum ratings sections of the SCES567F datasheet.

What is the maximum guaranteed data rate for SN74AVCH20T245KR when translating from 1.5 V to 3.3 V?

The SN74AVCH20T245KR guarantees a maximum data rate of 260 Mbps when translating from a 1.5-V supply domain to a 3.3-V domain. This value is explicitly listed in the "Max Data Rates" section of the SCES567F datasheet and corresponds to the worst-case timing under recommended operating conditions - ensuring reliable operation without derating in production systems.

Is the SN74AVCH20T245KR compatible with lead-free reflow processes?

Yes, the SN74AVCH20T245KR is RoHS-compliant and rated for lead-free reflow with a moisture sensitivity level (MSL) of Level-1 at 260°C peak temperature, as confirmed in TI's official packaging addendum. The VFBGA-GQL package uses NiPdAu terminal finish and is qualified for standard Pb-free soldering profiles without special prebake requirements - supporting high-yield manufacturing in modern SMT lines.