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Texas Instruments SN74AXC4T245BQBR
- Part No.:
- SN74AXC4T245BQBR
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
SN74AXC4T245BQBR.pdf
- Description:
- IC TRANSLATION TXRX 3.6V 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,419
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Product details
Overview
SN74AXC4T245 from Texas Instruments is a four-bit noninverting bus transceiver with dual-rail voltage translation, supporting independent VCCA and VCCB supplies from 0.65V to 3.6V, operating across –40°C to +125°C, delivering up to 380Mbps (1.8V→3.3V), and featuring VCC isolation and Ioff partial-power-down capability for use in mixed-voltage industrial communication interfaces.
For engineers reviewing the SN74AXC4T245 datasheet, SN74AXC4T245 pinout, SN74AXC4T245 application, or SN74AXC4T245 equivalent, key selection considerations include bidirectional level-shifting direction control per channel, tri-state output enable referenced to VCCA, glitch-free power sequencing, and compatibility with AVC-family translators in space-constrained embedded systems.
Technical Context
The SN74AXC4T245 implements two independent transceiver pairs (1A↔1B and 2A↔2B), each with dedicated direction-control (xDIR) and output-enable (xOE) inputs referenced solely to VCCA. Its dual-supply architecture enables asynchronous bidirectional translation between disparate voltage domains without external biasing or timing constraints.
VCC isolation disables all I/Os into high-impedance when either VCCA or VCCB drops below 100mV, while Ioff protection limits leakage current to ±8µA per port during partial power-down-critical for hot-swap and low-power retention modes in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 0.65V to 3.6V each - supports ultra-low-voltage logic (e.g., 0.8V FPGA I/O) interfacing with 3.3V peripherals |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| Max Data Rate | 380Mbps (1.8V→3.3V) - enables high-speed interconnect between modern low-voltage processors and legacy peripherals |
| VCC Isolation Threshold | <100mV on either rail - ensures automatic bus isolation during brown-out or power sequencing faults |
| Ioff Current | ±8µA max at 125°C - prevents back-drive current and maintains signal integrity during partial power-down |
| ESD Rating | ±8000V HBM, ±1000V CDM - meets industrial-grade robustness requirements without external protection |
| Propagation Delay | 4ns min (A→B, VCCA=3.3V/VCCB=3.3V) - supports tight timing budgets in synchronous data transfers |
Pinout & Package
SN74AXC4T245 is available in three 16-pin packages: PW (TSSOP, 5mm × 6.4mm), BQB (WQFN, 3.5mm × 2.5mm), and RSV (UQFN, 2.6mm × 1.8mm). All variants share identical pin functions and logic behavior.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply reference | Power rail for A-side I/Os and control inputs (xDIR/xOE); defines VIH/VIL thresholds for controls |
| VCCB | B-port supply reference | Independent power rail for B-side I/Os only; enables true dual-domain operation |
| 1A1, 1A2, 2A1, 2A2 | A-port data I/Os | Input/output pins referenced to VCCA; drive/receive signals on A-bus side |
| 1B1, 1B2, 2B1, 2B2 | B-port data I/Os | Input/output pins referenced to VCCB; interface with B-bus voltage domain |
| 1DIR, 2DIR | Direction control inputs | Determine data flow direction per transceiver pair (A→B or B→A); referenced to VCCA |
| 1OE, 2OE | Output-enable inputs | Tri-state corresponding outputs when high; referenced to VCCA; pull-up to VCCA ensures safe power-up state |
| GND | Ground reference | Common return path for both supply rails; two pins provided for low-inductance grounding |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail configurable voltage translation | Enables simultaneous up/down translation (e.g., 0.8V↔1.8V) without external level-shifters or direction arbitration logic |
| Glitch-free power supply sequencing | Allows VCCA and VCCB to be powered on/off in any order without bus contention or latch-up risk |
| VCC isolation | Automatically places all I/Os in high-impedance if either supply falls below 100mV - eliminates need for external power-fail detection |
| Ioff partial-power-down support | Prevents damaging current flow when one side is unpowered while the other remains active - essential for hot-plug and modular system designs |
| Compatible with AVC family | Shares pinout, timing, and electrical characteristics with TI's AVC-series translators - simplifies migration and second-source qualification |
Applications
| Industrial PLC Backplane Interface | Automotive ADAS Sensor Hub |
|---|---|
Use Scenario: Interfacing a 1.2V microcontroller with legacy 3.3V fieldbus peripherals (e.g., RS-485 transceivers, analog front-ends) on a programmable logic controller backplane. IC Role / Device Role / Timing Role: Bidirectional voltage translator enabling real-time command/response exchange between mismatched voltage domains while maintaining signal integrity under EMI-rich factory conditions. Use Value: Eliminates discrete resistor-based level shifters and reduces PCB area by 65% versus discrete solutions, while supporting –40°C to +125°C operation required for industrial enclosures. | Use Scenario: Connecting a 0.8V vision processor SoC to multiple 1.8V image sensors and 3.3V CAN FD controllers within an autonomous driving sensor fusion module. IC Role / Device Role / Timing Role: Four-bit transceiver providing independent direction control per lane to manage concurrent sensor readout and control signaling across three distinct voltage rails. Use Value: Glitch-free sequencing and VCC isolation prevent bus lockup during sensor hot-swap or power cycling, meeting ASIL-B functional safety prerequisites. |
| Wireless Baseband Unit | Building Automation Gateway |
Use Scenario: Bridging a 1.5V FPGA fabric to 2.5V RF front-end ICs and 3.3V Ethernet PHYs in a 5G small-cell baseband unit requiring compact, thermally efficient interconnect. IC Role / Device Role / Timing Role: High-speed level shifter supporting 380Mbps burst-mode data transfer between baseband and radio sections while minimizing propagation delay skew. Use Value: 4ns typical A→B propagation delay at 3.3V enables sub-10ns timing margins for DDR-like parallel interfaces, reducing jitter accumulation in multi-hop signal paths. | Use Scenario: Integrating a 3.3V HVAC controller MCU with 1.8V wireless SoCs (Zigbee/Thread) and 5V legacy BACnet MS/TP transceivers in a smart building edge gateway. IC Role / Device Role / Timing Role: Voltage-translating bus interface managing bidirectional command/status traffic between heterogeneous subsystems with independent power domains. Use Value: Ioff current ≤8µA at 125°C ensures zero standby power draw from unpowered modules, extending battery life in wireless sensor nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC4T245 | Narrower VCC range (1.2V–3.6V); no sub-1V operation; lower max speed (200Mbps) | Not suitable for ultra-low-voltage systems (e.g., 0.8V AI accelerators); lacks VCC isolation | Select SN74AXC4T245 when translating below 1.2V or requiring fail-safe isolation during brown-out |
| TXS0104E | Auto-direction sensing (no DIR pins); higher capacitance (12.1pF vs 2.0pF); no VCC isolation | Unidirectional auto-sensing limits use in full-duplex protocols; unsuitable for deterministic direction control | Choose SN74AXC4T245 for applications requiring explicit, per-lane direction control and guaranteed high-Z on supply loss |
Compared with SN74AVC4T245 and TXS0104E, SN74AXC4T245 uniquely supports sub-1V operation, provides hardware-enforced VCC isolation, and delivers 90% higher bandwidth than SN74AVC4T245-making it the only option for next-generation low-power, safety-critical, mixed-voltage interconnects.
Availability
SN74AXC4T245 is available at Aetrix Electronics and suitable for industrial automation, automotive ADAS subsystems, and wireless infrastructure requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN74AXC4T245 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 electronic components.
The SN74AXC4T245 belongs to TI's AXC family of advanced low-voltage translators, designed specifically for energy-efficient, mixed-signal systems where sub-1V logic interoperability, thermal resilience, and fail-safe power management are mandatory.
FAQ
What voltage ranges does the SN74AXC4T245 support on its VCCA and VCCB rails?
The SN74AXC4T245 supports independent supply voltages from 0.65V to 3.6V on both VCCA and VCCB rails. This allows translation between ultra-low-voltage domains (e.g., 0.8V AI accelerators) and standard logic levels (e.g., 3.3V peripherals). The device remains fully operational across this entire range, with validated switching performance down to 0.65V per rail, as confirmed in TI's SCES877B datasheet Section 5.3.
How does the VCC isolation feature work in the SN74AXC4T245?
The VCC isolation feature in the SN74AXC4T245 disables all I/Os and forces them into high-impedance when either VCCA or VCCB falls below 100mV. This occurs automatically without external circuitry or software intervention. It ensures bus isolation during power sequencing faults, brown-outs, or hot-swap events-critical for system reliability in industrial and automotive applications where SN74AXC4T245 is deployed.
Can the SN74AXC4T245 operate with only one supply rail powered?
Yes-the SN74AXC4T245 supports partial-power-down operation via its Ioff circuitry. When one rail (e.g., VCCB) is unpowered while VCCA remains active, leakage current is limited to ±8µA per port at 125°C. This prevents back-driving and maintains signal integrity on the powered side, making SN74AXC4T245 suitable for modular systems where subsystems power up/down independently.
What is the maximum data rate supported by the SN74AXC4T245, and under what conditions?
The SN74AXC4T245 supports up to 380Mbps when translating from 1.8V to 3.3V, as specified in the "Features" section of the official datasheet. This maximum rate is achieved under defined test conditions (TA = –40°C to +125°C, specific load and waveform parameters) and represents the upper bound for reliable operation in high-speed interconnects using SN74AXC4T245.
Are the direction-control and output-enable inputs of the SN74AXC4T245 referenced to VCCA or VCCB?
All control inputs-1DIR, 2DIR, 1OE, and 2OE-are referenced exclusively to VCCA, not VCCB. This means their VIH and VIL thresholds scale with VCCA voltage (e.g., VIH = VCCA × 0.70 for VCCA = 0.76V–1V), as detailed in Section 5.3 of the SN74AXC4T245 datasheet. This design simplifies control logic integration when VCCA powers the host controller.
SN74AXC4T245BQBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AXC
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Translation Transceiver
- Number of Elements:
- 2
- Number of Bits per Element:
- 2
- Input Type:
- -
- Output Type:
- 3-State
- 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:
- 16-WQFN (2.5x3.5)
SN74AXC4T245BQBR FAQ
1.How can I place an order for SN74AXC4T245BQBR through Aetrix?
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6.How does Aetrix verify that SN74AXC4T245BQBR is sourced from the original manufacturer or authorized distributors?
All SN74AXC4T245BQBR 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 SN74AXC4T245BQBR meets industry standards.
7.What is the process for return or replacement of SN74AXC4T245BQBR?
All SN74AXC4T245BQBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AXC4T245BQBR, 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 SN74AXC4T245BQBR part is unused and in its original packaging.
Return procedure for SN74AXC4T245BQBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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