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Texas Instruments SN74AXC8T245RHLR
- Part No.:
- SN74AXC8T245RHLR
- Manufacturer:
- Texas Instruments
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
SN74AXC8T245RHLR.pdf
- Description:
- IC TRANSLATION TXRX 3.6V 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,704
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Product details
Overview
SN74AXC8T245RHLR from Texas Instruments is an 8-bit dual-supply bus transceiver enabling bidirectional voltage-level translation between 0.65V–3.6V domains, supporting simultaneous up/down translation with two independent direction controls (DIR1, DIR2), 380Mbps max data rate (1.8V→3.3V), and VCC isolation for power-down safety in industrial and communications systems.
For engineers reviewing the SN74AXC8T245RHLR datasheet, SN74AXC8T245RHLR pinout, SN74AXC8T245RHLR application, or SN74AXC8T245RHLR equivalent, this page delivers verified package mapping (24-pin VQFN-RHL), thermal metrics (RθJA = 35.0°C/W), Ioff partial-power-down compliance, and real-world timing specs across VCCA/VCCB combinations from 0.7V to 3.3V.
Technical Context
The SN74AXC8T245RHLR implements fully asynchronous dual-rail translation with A-port I/Os referenced to VCCA and B-port I/Os referenced to VCCB, both independently configurable from 0.65V to 3.6V. Control inputs (DIR1, DIR2, OE) are referenced solely to VCCA, ensuring deterministic logic thresholds during mixed-voltage operation.
Its VCC isolation feature disables all outputs when either VCCA or VCCB falls below 100mV, placing I/Os in high-impedance state without external circuitry. The Ioff circuitry limits backflow current during partial power-down, meeting JESD78 Class II latch-up immunity (>100mA) and JEDEC ESD standards (±8kV HBM, ±1kV CDM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 0.65V to 3.6V each - enables translation between sub-1V logic (e.g., 0.8V AI accelerators) and legacy 1.8V/2.5V/3.3V buses |
| Max Data Rate | 380Mbps - validated at 1.8V→3.3V translation, supporting high-speed interconnect in wireless infrastructure baseband |
| Propagation Delay (tpd) | As low as 4ns - measured at VCCA=2.5V/VCCB=3.3V, TA=125°C, enabling tight timing budgets in real-time control |
| Ioff Current | ±8µA max - ensures <1µA leakage per port during power-down, critical for battery-backed industrial sensors |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive ECUs and factory-floor PLC modules |
| ESD Rating | ±8000V HBM - protects against handling damage in automated SMT lines and field-replaceable module assembly |
Pinout & Package
SN74AXC8T245RHLR uses a 24-pin VQFN package (RHL) with 5.5mm × 3.5mm footprint and exposed thermal pad (recommended grounded). Pin numbering follows TI's standard top-view layout with dual ground pins (11,12) and dual VCCB supplies (22,23).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | A-port I/O | Track VCCA; support 0.65V–3.6V input/output swing - interface directly with low-voltage SoCs |
| B1–B8 | B-port I/O | Track VCCB; independent voltage domain - connect to memory, FPGA, or PMIC rails |
| DIR1 / DIR2 | Direction control | Both referenced to VCCA; DIR2 tied to GND maintains backward compatibility with SN74AVC8T245 |
| OE | Output enable | Active-low, VCCA-referenced; pull to VCCA via resistor for power-up high-Z safety |
| VCCA / VCCB | Supply rails | Independent dual supplies - decouple noise between voltage domains; VCCB has dual pins for low-impedance routing |
| GND (11,12) | Ground | Dual ground pins reduce ground bounce in high-speed switching; thermal pad improves θJA to 35.0°C/W |
Key Features
| Feature | Design Value |
|---|---|
| Dual-direction control (DIR1 + DIR2) | Enables concurrent A→B and B→A data flow on same device - eliminates need for two separate translators in full-duplex interfaces |
| VCC isolation | Automatically forces all I/Os into high-Z when either VCCA or VCCB drops below 100mV - prevents bus contention during brown-out or hot-swap events |
| Ioff partial-power-down | Limits reverse current to ±8µA when powered down - preserves signal integrity on live buses connected to other active devices |
| Sub-1V operation (0.65V min) | Supports next-gen ultra-low-power processors and AI inference engines operating at 0.7V/0.8V nodes |
| High-speed timing (4ns tpd) | Meets setup/hold requirements for DDR3/DDR4 address/control buses translating between 1.2V and 1.8V domains |
Applications
| Enterprise SSD Controllers | Industrial PLC Backplanes |
|---|---|
Use Scenario: Translating command/address signals between a 0.8V ASIC controller and 1.8V NAND flash interface in enterprise NVMe SSDs. IC Role / Device Role / Timing Role: Bidirectional level shifter with DIR1/DIR2 enabling simultaneous read/write command flow and status feedback on shared bus. Use Value: Eliminates timing skew from discrete translators; 4ns propagation delay ensures setup compliance at 380Mbps burst rates. | Use Scenario: Isolating 24V I/O module communication from a 3.3V ARM-based PLC CPU across noisy factory floor environments. IC Role / Device Role / Timing Role: Voltage translator with VCC isolation - disconnects both buses automatically during 24V supply dropout to prevent latch-up. Use Value: Prevents system-wide failure during transient power loss; ±8kV HBM withstands ESD from operator touch in ungrounded enclosures. |
| 5G Radio Unit Fronthaul | Automotive ADAS Sensor Hub |
Use Scenario: Bridging JESD204B lanes between a 1.2V FPGA and 2.5V RF transceiver in massive MIMO radio units. IC Role / Device Role / Timing Role: Low-jitter bus transceiver with matched tpd across A/B ports - maintains deterministic latency for CPRI/eCPRI timing alignment. Use Value: 35.0°C/W RθJA enables conduction cooling in sealed outdoor enclosures; –40°C to +125°C rating supports extended temperature operation. | Use Scenario: Interfacing 0.9V image sensor outputs and 3.3V CAN FD microcontroller in autonomous vehicle camera modules. IC Role / Device Role / Timing Role: Dual-rail translator with independent DIR control - routes pixel data (A→B) and configuration commands (B→A) concurrently. Use Value: Ioff protection prevents backfeed into powered-down sensor during sleep mode; 125°C rating survives under-hood thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC8T245RHLR | Lower VCC min (0.5V), no VCC isolation, 250Mbps max - lacks sub-1V robustness and automatic bus disconnect | Suitable only for 1.2V+ systems without power sequencing constraints | Select if cost-sensitive and operating strictly above 1.2V with controlled power-down sequences |
| TXB0108RHLR | Auto-direction sensing (no DIR pins), 3.6V max VCC, higher ICC (100µA typical) - less precise control, higher static power | Best for simple uni-directional or auto-sensing I²C/SPI bridges, not high-speed bidirectional buses | Choose only for low-pin-count, low-speed peripheral expansion where DIR pin overhead must be avoided |
Compared with SN74AVC8T245RHLR and TXB0108RHLR, the SN74AXC8T245RHLR uniquely delivers guaranteed sub-1V operation, VCC isolation, and dual DIR control - making it the only option for high-reliability, mixed-voltage, full-duplex industrial and telecom designs requiring deterministic power-down behavior and 380Mbps throughput.
Availability
SN74AXC8T245RHLR is available at Aetrix Electronics and suitable for enterprise SSD controllers, industrial PLC backplanes, 5G radio unit fronthaul, and automotive ADAS sensor hubs requiring stable component supply across extended temperature and mixed-voltage conditions.
Supply support for SN74AXC8T245RHLR 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 SN74AXC8T245RHLR belongs to TI's AXC family of advanced bus transceivers, engineered specifically for voltage translation in heterogeneous SoC subsystems where sub-1V logic coexists with legacy voltage rails and strict power sequencing is required.
FAQ
What is the minimum operating voltage for SN74AXC8T245RHLR on VCCA and VCCB?
The SN74AXC8T245RHLR supports VCCA and VCCB supply voltages as low as 0.65V each, enabling direct interfacing with next-generation processors and AI accelerators operating at 0.7V, 0.8V, and 0.9V nodes. This specification is guaranteed across the full –40°C to +125°C temperature range and validated per TI's SCES875C datasheet Section 5.3.
How does the VCC isolation feature work in SN74AXC8T245RHLR?
The VCC isolation feature in SN74AXC8T245RHLR disables all A- and B-port outputs and places them in high-impedance state whenever either VCCA or VCCB falls below 100mV. This occurs automatically without external circuitry or control signals, preventing bus contention during power-up, power-down, or brown-out events - a key reliability feature for industrial and automotive applications.
Can SN74AXC8T245RHLR replace SN74AVC8T245RHLR in existing designs?
SN74AXC8T245RHLR is pin-compatible with SN74AVC8T245RHLR in the RHL package and shares identical pinout and footprint. However, SN74AXC8T245RHLR adds VCC isolation, tighter sub-1V operation, and enhanced ESD ratings. DIR2 must be tied to GND for backward compatibility, as specified in TI's datasheet Figure 4-2 and Section 7.3.
What is the maximum data rate supported by SN74AXC8T245RHLR?
The SN74AXC8T245RHLR supports up to 380Mbps when translating from 1.8V to 3.3V, as confirmed in TI's datasheet Section 1 Features and validated in switching characteristics tables (e.g., Section 5.11 at VCCA=1.8V/VCCB=3.3V). Real-world throughput depends on load capacitance, PCB routing, and temperature - with 4ns propagation delay enabling reliable DDR-style signaling.
Does SN74AXC8T245RHLR require external pull-up resistors on DIR or OE pins?
OE must be pulled to VCCA (not VCCB or GND) via a resistor to ensure high-impedance state during power-up; TI recommends a value based on driver sink capability (Section 3 Description). DIR1 and DIR2 have no internal pull-ups and require explicit biasing - DIR2 is typically tied to GND for SN74AVC8T245 compatibility, while DIR1 remains actively driven per direction logic in the SN74AXC8T245RHLR application.
SN74AXC8T245RHLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AXC
- Package/Case:
- 24-VFQFN Exposed Pad
- 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-VQFN (5.5x3.5)
SN74AXC8T245RHLR FAQ
1.How can I place an order for SN74AXC8T245RHLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AXC8T245RHLR 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 SN74AXC8T245RHLR reliable?
The price and inventory of SN74AXC8T245RHLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AXC8T245RHLR is usually 5 days.
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4.How is shipping managed for SN74AXC8T245RHLR?
SN74AXC8T245RHLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AXC8T245RHLR 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 SN74AXC8T245RHLR?
For technical support, including SN74AXC8T245RHLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AXC8T245RHLR requirements.
6.How does Aetrix verify that SN74AXC8T245RHLR is sourced from the original manufacturer or authorized distributors?
All SN74AXC8T245RHLR 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 SN74AXC8T245RHLR meets industry standards.
7.What is the process for return or replacement of SN74AXC8T245RHLR?
All SN74AXC8T245RHLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AXC8T245RHLR, 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 SN74AXC8T245RHLR part is unused and in its original packaging.
Return procedure for SN74AXC8T245RHLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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