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Texas Instruments SN74AXC8T245PWR

Name: SN74AXC8T245PWR
Brand: Texas Instruments
SKU: SN74AXC8T245PWR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74AXC8T245PWR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 24-TSSOP (0.173", 4.40mm Width)

Datasheet:: SN74AXC8T245PWR.pdf

Description:: IC TRANSLATION TXRX 3.6V 24TSSOP

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Product details

Overview

SN74AXC8T245 from Texas Instruments is an 8-bit dual-supply bus transceiver enabling bidirectional voltage-level translation between 0.65V–3.6V domains on A and B ports, supporting up to 380Mbps (1.8V→3.3V), operating from –40°C to +125°C, with VCC isolation and partial power-down (I_off) for robust system-level power management in mixed-voltage SoC interfaces.

For engineers reviewing the SN74AXC8T245 datasheet, SN74AXC8T245 pinout, SN74AXC8T245 application, or SN74AXC8T245 equivalent, key selection considerations include dual-rail supply flexibility (VCCA/VCCB), DIR1/DIR2 independent direction control, OE-referenced-to-VCCA tri-state enable, thermal performance in TSSOP-24 (R_θJA = 92°C/W), and compatibility with legacy SN74AVC8T245 designs.

Technical Context

The SN74AXC8T245 implements asynchronous bidirectional data flow using two independent supply rails (VCCA and VCCB), each configurable from 0.65V to 3.6V, with all A-port I/Os referenced to VCCA and all B-port I/Os referenced to VCCB. Direction control is managed via DIR1 and DIR2 inputs-both referenced to VCCA-enabling simultaneous up/down translation across the same device.

Its VCC isolation feature disables all outputs when either VCCA or VCCB falls below 100mV, placing I/Os in high-impedance state; the I_off circuitry limits backflow current during partial power-down, with leakage ≤ ±8µA per port at 125°C. Control logic (DIR/OE) operates exclusively from VCCA, decoupling control domain from data domain.

Key Specifications

Parameter	Value and Actual Design Meaning
VCCA / VCCB Range	0.65V to 3.6V each - enables interface between sub-1V logic (e.g., 0.8V AI accelerators) and 3.3V peripherals without external level-shifting circuitry
Max Data Rate	380Mbps (1.8V→3.3V) - supports high-speed interconnects such as LPDDR I/O, PCIe sideband, or MIPI D-PHY auxiliary channels
Operating Temp	–40°C to +125°C - qualified for automotive under-hood, industrial motor drives, and base station RF modules
I_off Current	≤ ±8µA per port at 125°C - prevents damaging back-current when one rail is powered down while the other remains active
VCC Isolation	Outputs disabled if VCCA < 100mV or VCCB < 100mV - ensures safe bus isolation during brown-out or hot-plug events
ESD Rating	HBM ±8000V, CDM ±1000V - exceeds JEDEC JESD22-A114 and JESD22-C101 for reliable handling in automated assembly
Propagation Delay	Min 4ns (A→B, VCCA=2.5V/VCCB=3.3V, 125°C) - enables timing-critical paths in real-time control loops and sensor fusion subsystems

Pinout & Package

PW package: 24-pin TSSOP (7.8mm × 6.4mm), lead pitch 0.65mm, exposed thermal pad (recommended grounded). Compatible with standard surface-mount reflow profiles (JEDEC J-STD-020).

Pin/Terminal	Circuit Role	Design Meaning
VCCA	A-port supply reference	Power rail for A1–A8 and control inputs (DIR1, DIR2, OE); defines input thresholds and output drive strength for A-side
VCCB	B-port supply reference	Power rail for B1–B8; sets output voltage levels and input thresholds for B-side I/Os
A1–A8	Data I/O (A port)	Bi-directional signals referenced to VCCA; support 0.65V–3.6V logic swing; capacitance = 5.7pF (3.3V)
B1–B8	Data I/O (B port)	Bi-directional signals referenced to VCCB; independent voltage domain; capacitance = 5.7pF (3.3V)
DIR1, DIR2	Direction control (VCCA-referenced)	Independent control of A↔B data flow direction; DIR2 tied to GND maintains backward compatibility with SN74AVC8T245
OE	Output enable (VCCA-referenced)	Pull to GND enables transceiver; pull to VCCA places all A/B I/Os in high-Z; critical for bus arbitration and power sequencing
GND (×2)	Ground return	Dual ground pins reduce impedance and improve noise immunity; recommended layout: low-inductance connection to solid ground plane

Key Features

Feature	Design Value
Dual independent supply rails	Enables simultaneous 0.65V↔1.8V and 1.2V↔3.3V translation on same device-eliminates need for multiple discrete translators in heterogeneous SoC interconnects
Multiple direction-control pins	DIR1 and DIR2 allow concurrent A→B and B→A traffic (e.g., command + status lanes), improving throughput vs. single-DIR devices
VCC isolation	Automatic high-Z output disable when either VCCA or VCCB drops below 100mV-prevents bus contention during asymmetric power sequencing
Partial power-down (I_off)	Leakage ≤ ±8µA per port at 125°C when unpowered-enables safe sleep mode in battery-powered edge nodes without isolating external circuitry
Backward compatibility mode	DIR2 tied to GND replicates SN74AVC8T245 behavior-allows drop-in replacement in legacy designs with no firmware or layout changes

Applications

Enterprise SSD Controllers	Automotive ADAS Sensor Hubs
Use Scenario: Interfacing a 0.8V AI inference engine core to a 3.3V NVMe controller PHY in a high-density enterprise SSD. IC Role / Device Role: Bidirectional voltage translator managing command/address (A→B) and status/data (B→A) traffic across mismatched voltage domains. Use Value: Eliminates discrete level shifters and associated board area; supports 380Mbps throughput required for PCIe Gen4 sideband signaling.	Use Scenario: Aggregating 1.2V camera sensor streams and 2.5V radar preprocessor outputs into a 3.3V domain MCU in a centralized ADAS domain controller. IC Role / Device Role: Dual-rail bus transceiver enabling concurrent up/down translation for multi-sensor time-synchronized data ingestion. Use Value: DIR1/DIR2 independence allows parallel sensor read/write without direction toggling latency; –40°C to +125°C rating ensures operation in under-hood environments.
Industrial PLC I/O Modules	5G Small Cell Baseband Units
Use Scenario: Connecting a 1.8V FPGA fabric to legacy 2.5V/3.3V fieldbus transceivers (RS-485, CAN FD) in modular programmable logic controllers. IC Role / Device Role: Voltage-level bridging component with VCC isolation ensuring safe hot-swap of I/O cards without disrupting backplane power. Use Value: VCC isolation prevents bus glitches during card insertion/removal; I_off protects FPGA I/Os from backfeed during partial module power-down.	Use Scenario: Level-shifting between 0.7V mmWave RFIC control lines and 1.8V baseband processor GPIOs in compact 5G small cell radio units. IC Role / Device Role: Low-voltage interface translator supporting sub-1V logic nodes required for power-constrained RF front-end control. Use Value: 0.65V minimum VCCA/VCCB enables direct interfacing with latest-generation RFICs; 4ns propagation delay meets tight timing budgets for beamforming calibration loops.

Enterprise SSD Controllers

Automotive ADAS Sensor Hubs

Use Scenario: Interfacing a 0.8V AI inference engine core to a 3.3V NVMe controller PHY in a high-density enterprise SSD.

IC Role / Device Role: Bidirectional voltage translator managing command/address (A→B) and status/data (B→A) traffic across mismatched voltage domains.

Use Value: Eliminates discrete level shifters and associated board area; supports 380Mbps throughput required for PCIe Gen4 sideband signaling.

Use Scenario: Aggregating 1.2V camera sensor streams and 2.5V radar preprocessor outputs into a 3.3V domain MCU in a centralized ADAS domain controller.

IC Role / Device Role: Dual-rail bus transceiver enabling concurrent up/down translation for multi-sensor time-synchronized data ingestion.

Use Value: DIR1/DIR2 independence allows parallel sensor read/write without direction toggling latency; –40°C to +125°C rating ensures operation in under-hood environments.

Industrial PLC I/O Modules

5G Small Cell Baseband Units

Use Scenario: Connecting a 1.8V FPGA fabric to legacy 2.5V/3.3V fieldbus transceivers (RS-485, CAN FD) in modular programmable logic controllers.

IC Role / Device Role: Voltage-level bridging component with VCC isolation ensuring safe hot-swap of I/O cards without disrupting backplane power.

Use Value: VCC isolation prevents bus glitches during card insertion/removal; I_off protects FPGA I/Os from backfeed during partial module power-down.

Use Scenario: Level-shifting between 0.7V mmWave RFIC control lines and 1.8V baseband processor GPIOs in compact 5G small cell radio units.

IC Role / Device Role: Low-voltage interface translator supporting sub-1V logic nodes required for power-constrained RF front-end control.

Use Value: 0.65V minimum VCCA/VCCB enables direct interfacing with latest-generation RFICs; 4ns propagation delay meets tight timing budgets for beamforming calibration loops.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74AVC8T245	Fixed 1.2V–3.6V V_CC range; no sub-1V support; DIR2 not implemented (single DIR only); no VCC isolation	Limited to higher-voltage systems; cannot interface with 0.7V/0.8V logic; lacks fail-safe isolation during brown-out	Select SN74AXC8T245 when translating below 1.0V or requiring VCC isolation/I_off; use SN74AVC8T245 only for cost-sensitive 1.2V+ legacy upgrades.
TXS0108E	Auto-direction sensing (no DIR pins); open-drain B-side; max 1.8V V_CCB; no VCC isolation; lower ESD (HBM ±6000V)	Suitable for push-pull A-side to open-drain B-side (e.g., I²C), but incompatible with full bidirectional push-pull buses like PCIe or DDR	Choose SN74AXC8T245 for controlled bidirectional push-pull buses with precise direction timing; TXS0108E fits only auto-sensing, open-drain scenarios.

Compared with SN74AVC8T245 and TXS0108E, the SN74AXC8T245 uniquely supports sub-1V operation, provides hardware-enforced VCC isolation, and offers independent DIR control-making it the only option for next-gen ultra-low-voltage SoC interconnects requiring deterministic direction control and robust power sequencing.

Availability

SN74AXC8T245 is available at Aetrix Electronics and suitable for enterprise SSD controllers, automotive ADAS sensor hubs, industrial PLC I/O modules, and 5G small cell baseband units requiring stable component supply across extended temperature and mixed-voltage design cycles.

Supply support for SN74AXC8T245 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 communications markets.

The SN74AXC8T245 belongs to TI's AXC family of advanced bus transceivers, designed specifically for voltage-domain bridging in heterogeneous SoCs where sub-1V logic cores interface with legacy 1.8V–3.3V peripherals-addressing power efficiency, signal integrity, and system-level reliability.

FAQ

What is the minimum operating voltage for SN74AXC8T245 on each supply rail?

The SN74AXC8T245 supports VCCA and VCCB down to 0.65V independently. This enables direct interfacing with emerging sub-1V logic families (e.g., 0.7V/0.8V AI accelerators) without intermediate regulators or translators. Operation below 0.65V is not characterized and may result in undefined behavior or failure to meet timing specifications.

How does SN74AXC8T245 handle power sequencing when VCCA and VCCB are powered up at different times?

The SN74AXC8T245 uses VCC isolation: if either VCCA or VCCB falls below 100mV, all A- and B-port outputs enter high-impedance state automatically. This prevents bus contention during asymmetric power-up/down sequences. OE must still be held inactive (high) until both supplies stabilize to ensure clean enable timing for the SN74AXC8T245.

Can SN74AXC8T245 replace SN74AVC8T245 in an existing design without modifications?

Yes-when DIR2 is tied to GND, the SN74AXC8T245 replicates SN74AVC8T245 functionality, pin-for-pin in PW (TSSOP-24) package. However, SN74AXC8T245 adds VCC isolation and I_off, which enhance robustness but require no layout change. Full benefit (e.g., sub-1V operation) requires firmware updates to leverage DIR2 and updated supply configurations.

What is the maximum data rate supported by SN74AXC8T245, and under what conditions?

The SN74AXC8T245 supports up to 380Mbps when translating from 1.8V (VCCA) to 3.3V (VCCB) at 25°C. At 125°C, the maximum verified rate drops to 275Mbps due to increased propagation delay. Rates above 380Mbps are not characterized and may violate setup/hold timing margins in real-world PCB layouts with trace capacitance and crosstalk.

Does SN74AXC8T245 require external pull-up or pull-down resistors on DIR or OE pins?

No external resistors are required on DIR1, DIR2, or OE for basic operation-the SN74AXC8T245 has internal weak pull-downs on DIR inputs and accepts direct CMOS logic levels referenced to VCCA. However, during power-up, OE should be held high (via VCCA pull-up) to ensure outputs remain in high-Z until supply stabilization, preventing bus glitches in the SN74AXC8T245.

SN74AXC8T245PWR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74AXC

Package/Case:: 24-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Logic Type:: Translation Transceiver

Number of Elements:: 1

Number of Bits per Element:: 8

Input Type:: -

Output Type:: Tri-State, Non-Inverted

Current - Output High, Low:: 12mA, 12mA

Voltage - Supply:: 0.65V ~ 3.6V

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-TSSOP

SN74AXC8T245PWR FAQ

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All SN74AXC8T245PWR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74AXC8T245PWR meets industry standards.

7.What is the process for return or replacement of SN74AXC8T245PWR?

All SN74AXC8T245PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AXC8T245PWR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SN74AXC8T245PWR part is unused and in its original packaging.

Return procedure for SN74AXC8T245PWR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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