Texas Instruments SN74AVCH24T245GRGR

Overview

SN74AVCH24T245 from Texas Instruments is a 24-bit dual-supply bus transceiver enabling bidirectional voltage translation between 1.2-V to 3.6-V domains, with 6 independent channel pairs, 380 Mbps max data rate (1.8V→3.3V), I_off partial-power-down support, and V_CC isolation. It serves in mixed-voltage SoC interconnects requiring level-shifting across A/B ports.

For engineers reviewing the SN74AVCH24T245 datasheet, SN74AVCH24T245 pinout, SN74AVCH24T245 application, or SN74AVCH24T245 equivalent, key selection criteria include configurable dual-rail operation, bus-hold inputs eliminating external resistors, 83-pin LFBGA package, 3.2 ns typical propagation delay (A→B, V_CCA=3.3 V, V_CCB=3.3 V), and ±100 mA latch-up immunity per JESD78 Class II.

Technical Context

The SN74AVCH24T245 implements six independent 4-bit directional channels, each with dedicated DIR and OE control referenced to V_CCA. Its fully configurable dual-rail architecture allows simultaneous operation of A-port (1.2–3.6 V) and B-port (1.2–3.6 V) at different supply voltages, enabling translation across 1.2-V, 1.5-V, 1.8-V, 2.5-V, and 3.3-V nodes without external logic.

V_CC isolation ensures both ports enter high-impedance state if either V_CCA or V_CCB is at GND. Bus-hold circuitry maintains valid logic states on undriven inputs, and I_off protection prevents backflow current during partial power-down, supporting hot-swap and low-power system states.

Key Specifications

Pinout & Package

Package: 83-pin LFBGA (RG), 10.0 mm × 4.5 mm body size, 0.5-mm pitch, bottom-side solder balls.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH16T245DGGR and TXB0304RUT, the SN74AVCH24T245 offers superior channel count, explicit DIR/OE control per group, integrated bus-hold, and broader 1.2–3.6-V dual-rail support - making it uniquely suited for complex, high-density, mixed-voltage SoC interconnects.

Availability

SN74AVCH24T245 is available at Aetrix Electronics and suitable for mobile baseband interconnects, industrial PLC backplanes, enterprise SSD controllers, and telecom line card voltage translation requiring stable component supply and long-term lifecycle assurance.

Supply support for SN74AVCH24T245 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 SN74AVCH24T245 belongs to TI's AVC family of advanced voltage-translating transceivers, engineered specifically for low-voltage, high-speed digital interconnects in portable, industrial, and communications equipment.

FAQ

What is the minimum operating voltage for SN74AVCH24T245 on both VCCA and VCCB rails?

The SN74AVCH24T245 supports a minimum supply voltage of 1.2 V on both V_CCA and V_CCB rails, as specified in the recommended operating conditions table. Operation below 1.2 V is not guaranteed and may result in undefined logic behavior or failure to meet timing specifications. The device remains functional across the full 1.2–3.6 V range on each rail independently, enabling ultra-low-power system designs.

Does SN74AVCH24T245 require external pull-up or pull-down resistors on its data lines?

No, the SN74AVCH24T245 does not require external pull-up or pull-down resistors due to integrated bus-hold circuitry on all data inputs. This feature actively maintains the last-valid logic state on undriven or floating inputs, eliminating the need for 48 discrete resistors in a full 24-bit configuration. Bus-hold current is specified up to 100 μA at 3.3 V, ensuring reliable state retention without external components.

How does the VCC isolation feature function in SN74AVCH24T245 during power sequencing?

The V_CC isolation feature in the SN74AVCH24T245 ensures that if either V_CCA or V_CCB is driven to GND (e.g., during uncontrolled power-down), all outputs on both A and B ports automatically enter a high-impedance state. This prevents bus contention and back-driving between powered and unpowered domains, making the SN74AVCH24T245 ideal for systems requiring robust power sequencing, hot-swap capability, or partial power-down modes without risk of damage or data corruption.

Can SN74AVCH24T245 translate between 1.2-V and 3.3-V logic levels bidirectionally within the same channel?

Yes, the SN74AVCH24T245 supports true bidirectional voltage translation between 1.2-V and 3.3-V logic levels within each of its six 4-bit channels. When V_CCA = 1.2 V and V_CCB = 3.3 V, data flows from A to B with level shifting from 1.2-V logic to 3.3-V logic; reversing DIR causes B-to-A flow with 3.3-V-to-1.2-V translation. The device maintains valid VOH/VOL levels and timing across this full range, validated per JEDEC standards.

What thermal performance metrics are specified for SN74AVCH24T245 in the RG (LFBGA) package?

The SN74AVCH24T245 in the RG (83-pin LFBGA) package has a junction-to-ambient thermal resistance (R_θJA) of 38.1°C/W and a junction-to-board thermal resistance (R_θJB) of 17.0°C/W, per JESD51-7 testing. These values assume standard JEDEC 2-layer board conditions. The low R_θJB confirms efficient heat transfer to the PCB, supporting continuous operation at 85°C ambient when properly routed with thermal vias and copper pour under the package.