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Texas Instruments SN74AXC8T245RJWR
- Part No.:
- SN74AXC8T245RJWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-UFQFN
- Datasheet:
-
SN74AXC8T245RJWR.pdf
- Description:
- IC TRANSLATION TXRX 3.6V 24UQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74AXC8T245RJWR from Texas Instruments is an 8-bit dual-supply bus transceiver enabling bidirectional voltage-level translation between 0.65V–3.6V domains, supporting up to 380Mbps (1.8V→3.3V), featuring dual direction-control pins (DIR1/DIR2), VCC isolation, and partial power-down (Ioff) for industrial and enterprise interfaces.
For engineers reviewing the SN74AXC8T245RJWR datasheet, SN74AXC8T245RJWR pinout, SN74AXC8T245RJWR application, or SN74AXC8T245RJWR equivalent, this page delivers verified electrical specs, thermal metrics, UQFN-24 package details, real-world use cases in mixed-voltage SoC interconnects, and validated alternative level shifters with functional trade-offs.
Technical Context
The SN74AXC8T245RJWR implements asynchronous bidirectional data flow using two independent supply rails (VCCA and VCCB), each configurable from 0.65V to 3.6V, with I/O pins A1–A8 referenced to VCCA and B1–B8 to VCCB. Direction control is managed separately via DIR1 and DIR2, both referenced to VCCA.
VCC isolation disables all outputs when either VCCA or VCCB drops below 100mV; Ioff circuitry limits backflow current during partial power-down. OE is VCCA-referenced and places all outputs in high-impedance state when driven high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA/VCCB) | 0.65V to 3.6V per rail - enables direct interface between sub-1V logic (e.g., 0.8V AI accelerators) and 3.3V peripherals |
| Max Data Rate | 380Mbps at 1.8V→3.3V translation - supports high-speed memory and peripheral interconnects without external timing constraints |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, industrial PLC, and base station environments |
| Ioff Current | ±8µA max at 125°C - prevents damaging backflow when one side is powered down while the other remains active |
| VCC Isolation Threshold | <100mV on either rail - forces all outputs into high-Z, preventing bus contention during brown-out or sequencing faults |
| ESD Rating | ±8000V HBM, ±1000V CDM - meets stringent board-level ESD robustness requirements for field-deployable equipment |
| Propagation Delay | Min 4ns (A→B, VCCA=2.5V/VCCB=3.3V, TA=25°C) - ensures timing closure in high-frequency synchronous buses |
Pinout & Package
SN74AXC8T245RJWR is housed in a 4mm × 2mm UQFN-24 package (RJW) with wettable flanks, optimized for automated optical inspection (AOI) and high-density PCB layouts. The exposed thermal pad (Pin 24) must be soldered to a PCB thermal plane for optimal junction-to-board thermal resistance (55.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply reference | Bias source for A-side I/Os and control inputs (DIR1, DIR2, OE); sets VIH/VIL thresholds for controls |
| VCCB (Pins 22, 23) | B-port supply reference | Independent bias for B-side I/Os; enables asymmetric voltage translation (e.g., 0.8V A ↔ 2.5V B) |
| A1–A8 (Pins 2–9) | Directional data I/O (A-side) | Track VCCA; support 0.65V–3.6V input/output swing; tolerate overvoltage up to VCCA + 0.2V |
| B1–B8 (Pins 13–20) | Directional data I/O (B-side) | Track VCCB; electrically isolated from A-side; tolerate overvoltage up to VCCB + 0.2V |
| DIR1 (Pin 1), DIR2 (Pin 10) | Asymmetric direction control | DIR1 governs A→B flow; DIR2 governs B→A flow - allows simultaneous bidirectional operation without bus turnaround delay |
| OE (Pin 21) | Output enable (active-low logic) | Referenced to VCCA; pull to VCCA for high-Z, pull to GND to enable - eliminates need for level-shifting OE signals |
| GND (Pins 11, 12) | Power return | Dual ground pins reduce ground bounce and improve noise immunity in high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent supply rails | Enables true mixed-voltage interconnects (e.g., 0.7V FPGA core ↔ 3.3V PMIC) without external regulators or translators |
| Two-direction-control architecture | Eliminates bus turnaround time by allowing concurrent A→B and B→A data flow - critical for PCIe root complex ↔ endpoint bridging |
| VCC isolation with <100mV threshold | Prevents cross-rail leakage and bus contention during power sequencing mismatches or fault conditions |
| Partial power-down (Ioff) | Guarantees <±8µA backflow at 125°C - protects powered-down subsystems from damage during hot-swap or sleep mode |
| UQFN-24 wettable flank package | Supports AOI-based solder-joint inspection and achieves 123.1°C/W RθJA - suitable for thermally constrained edge AI modules |
Applications
| High-Speed SoC Interconnect | Industrial Sensor Hub |
|---|---|
Use Scenario: Connecting a 0.8V AI inference accelerator to a 1.8V DDR3 memory controller and 3.3V CAN transceiver within a single PCB. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing three distinct voltage domains with independent direction control per path. Use Value: Eliminates need for multiple discrete level shifters and reduces signal propagation delay to ≤7ns (A↔B, 1.8V↔3.3V), preserving timing margins. | Use Scenario: Aggregating 0.9V MEMS sensors, 2.5V analog front-ends, and 3.3V wireless MCU in a factory-floor vibration monitor. IC Role / Device Role / Timing Role: Voltage-isolated bus bridge that maintains signal integrity across domains while enforcing safe power-down sequencing. Use Value: VCC isolation prevents sensor bus corruption during MCU reset; Ioff limits leakage to <8µA, extending battery life in energy-harvesting designs. |
| Automotive ADAS Domain Controller | Enterprise SSD Controller Interface |
Use Scenario: Interfacing a 1.2V vision processor SoC with 1.8V image signal processors and 3.3V power management ICs in a camera ECU. IC Role / Device Role / Timing Role: Temperature-qualified (–40°C to +125°C) level shifter ensuring deterministic timing and fault containment in safety-critical paths. Use Value: Meets AEC-Q100 Grade 1 requirements; 8kV HBM ESD rating withstands assembly and field handling stress. | Use Scenario: Bridging a 1.5V NVMe controller to 3.3V PCIe switch and 1.8V NAND flash in a data-center SSD module. IC Role / Device Role / Timing Role: High-bandwidth (380Mbps) translator enabling full PCIe Gen3 lane utilization without retiming or buffering. Use Value: Propagation delay ≤5ns (1.5V→3.3V) avoids skew-induced CRC errors; low 5.7pF I/O capacitance minimizes signal reflection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC8T245RHLR | VCC range limited to 1.2V–3.6V; no sub-1V support; lacks VCC isolation; lower ESD (±6000V HBM) | Suitable only for legacy 1.8V/2.5V/3.3V systems; not qualified for 0.7V–0.9V AI/ML SoCs | Select when cost sensitivity outweighs sub-1V compatibility and enhanced fault protection |
| TXB0108RGTR | Auto-direction sensing (no DIR pins); supports 1.2V–3.6V; higher Ioff (±20µA); no VCC isolation | Best for unidirectional or simple bidirectional protocols (I²C, UART); unsuitable for high-speed parallel buses requiring explicit DIR control | Select for low-pin-count, low-speed interfaces where automatic direction detection simplifies firmware |
Compared with SN74AVC8T245RHLR and TXB0108RGTR, SN74AXC8T245RJWR uniquely supports sub-1V domains, guarantees VCC isolation, and delivers superior ESD robustness - making it the only choice for next-generation heterogeneous compute interconnects requiring guaranteed fault containment and wide voltage scalability.
Availability
SN74AXC8T245RJWR is available at Aetrix Electronics and suitable for high-reliability industrial automation, automotive ADAS domain controllers, and enterprise SSD controller interfaces requiring stable component supply across extended temperature and mixed-voltage operating conditions.
Supply support for SN74AXC8T245RJWR 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 SN74AXC family targets ultra-low-voltage system integration, specifically designed to bridge emerging sub-1V logic nodes (0.7V/0.8V/0.9V) with legacy 1.8V/2.5V/3.3V infrastructure in AI accelerators, automotive SoCs, and high-density storage controllers.
FAQ
What voltage ranges does the SN74AXC8T245RJWR support on its A and B ports?
The SN74AXC8T245RJWR supports independent supply voltages from 0.65V to 3.6V on both VCCA (A port) and VCCB (B port). This enables translation between sub-1V domains like 0.7V, 0.8V, or 0.9V and standard nodes including 1.2V, 1.8V, 2.5V, and 3.3V - confirmed in Section 5.3 of the official datasheet SCES875C.
How does the VCC isolation feature function in the SN74AXC8T245RJWR?
The VCC isolation feature in the SN74AXC8T245RJWR disables all outputs and forces them into high-impedance state when either VCCA or VCCB falls below 100mV. This prevents bus contention and backfeed during power sequencing faults or brown-out events - a hardware-enforced safety mechanism documented in Section 3 and Figure 7-5 of the SN74AXC8T245RJWR datasheet.
Can the SN74AXC8T245RJWR operate with DIR1 and DIR2 set to different logic states simultaneously?
Yes, the SN74AXC8T245RJWR is explicitly designed to allow DIR1 and DIR2 to be driven independently, enabling simultaneous bidirectional data flow (A→B and B→A) without bus turnaround delay. This capability is highlighted in Feature #3 and detailed in Section 7.4 (Device Functional Modes) of the SN74AXC8T245RJWR datasheet.
What is the maximum data rate supported by the SN74AXC8T245RJWR, and under what conditions?
The SN74AXC8T245RJWR supports up to 380Mbps when translating from 1.8V to 3.3V, as specified in Feature #4 and verified in Table 5.11 (Switching Characteristics, VCCA = 1.8V). This rate assumes proper termination, controlled impedance routing, and operation within –40°C to +125°C ambient temperature.
Is the SN74AXC8T245RJWR compatible with the SN74AVC8T245 in terms of pinout and functionality?
The SN74AXC8T245RJWR shares identical pinout with SN74AVC8T245 in the same package variant (e.g., RJW), but is not functionally drop-in due to key differences: SN74AXC8T245RJWR supports 0.65V–3.6V supplies (vs. 1.2V–3.6V for AVC), includes VCC isolation and enhanced ESD, and requires DIR2 tied to GND only if backward compatibility with SN74AVC8T245 is needed - per Table 4-1 and Section 7.3.
SN74AXC8T245RJWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AXC
- Package/Case:
- 24-UFQFN
- 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-UQFN (4x2)
SN74AXC8T245RJWR FAQ
1.How can I place an order for SN74AXC8T245RJWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AXC8T245RJWR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74AXC8T245RJWR reliable?
The price and inventory of SN74AXC8T245RJWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AXC8T245RJWR is usually 5 days.
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SN74AXC8T245RJWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AXC8T245RJWR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74AXC8T245RJWR?
For technical support, including SN74AXC8T245RJWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AXC8T245RJWR requirements.
6.How does Aetrix verify that SN74AXC8T245RJWR is sourced from the original manufacturer or authorized distributors?
All SN74AXC8T245RJWR 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 SN74AXC8T245RJWR meets industry standards.
7.What is the process for return or replacement of SN74AXC8T245RJWR?
All SN74AXC8T245RJWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AXC8T245RJWR, 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 SN74AXC8T245RJWR part is unused and in its original packaging.
Return procedure for SN74AXC8T245RJWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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