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Texas Instruments SN74AXC4T245RSVR
- Part No.:
- SN74AXC4T245RSVR
- Manufacturer:
- Texas Instruments
- Package:
- 16-UFQFN
- Datasheet:
-
SN74AXC4T245RSVR.pdf
- Description:
- IC TRANSLATION TXRX 3.6V 16UQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74AXC4T245 from Texas Instruments is a four-bit noninverting bus transceiver with dual configurable voltage rails (VCCA and VCCB), supporting 0.65V–3.6V operation per port, ±8000V HBM ESD rating, –40°C to +125°C temperature range, and up to 380Mbps data rate in 1.8V-to-3.3V translation. It enables bidirectional level shifting in mixed-voltage SoC interconnects, such as between low-voltage processors and legacy 3.3V peripherals.
For engineers reviewing the SN74AXC4T245 datasheet, SN74AXC4T245 pinout, SN74AXC4T245 application, or SN74AXC4T245 equivalent, this page delivers verified electrical parameters, real-world use cases for industrial and communications systems, validated pin functions across UQFN-16 packaging, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The SN74AXC4T245 implements two independent transceiver pairs (1A↔1B and 2A↔2B), each controlled by dedicated direction (xDIR) and output-enable (xOE) inputs referenced to VCCA. Its fully dual-rail architecture allows simultaneous up-translation (e.g., 0.8V A-port → 3.3V B-port) and down-translation (e.g., 3.3V B-port → 0.8V A-port) within the same device.
VCC isolation disables all I/Os into high-impedance when either VCCA or VCCB falls below 100mV; Ioff protection limits leakage to ±8µA during partial power-down; and glitch-free power sequencing permits arbitrary VCCA/VCCB ramp order without bus contention or latch-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA / VCCB) | 0.65V to 3.6V - supports direct interface between sub-1V logic and 3.3V buses without external biasing. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial control, and base station environments. |
| ESD Rating (HBM) | ±8000V - exceeds JEDEC JS-001 Class 3A, enabling robust handling in automated assembly lines. |
| Max Data Rate | 380Mbps - verified at 1.8V→3.3V translation, sufficient for high-speed SPI, eMMC, or parallel sensor interfaces. |
| Ioff Current | ±8µA max - prevents back-drive current during power sequencing, critical for hot-swap and multi-rail power domains. |
| VCC Isolation Threshold | <100mV - forces automatic high-Z on both ports if either supply collapses, preventing bus contention during brownout. |
| Propagation Delay (min/max) | 0.5ns / 185ns - delay asymmetry (e.g., 4ns A→B vs. 4ns B→A at 3.3V) enables timing-critical bidirectional protocols. |
Pinout & Package
SN74AXC4T245 is packaged in a 2.6mm × 1.8mm UQFN-16 (RSV) with wettable flanks, optimized for space-constrained PCB layouts and automated optical inspection. Thermal resistance RθJA = 130.1°C/W enables operation at full speed without forced air in ambient temperatures up to 85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA | A-port supply reference | Bias source for all A-side I/Os and control inputs (xDIR/xOE); sets VIH/VIL thresholds for control pins. |
| VCCB | B-port supply reference | Bias source for all B-side I/Os only; independent of VCCA, enabling true dual-voltage operation. |
| 1A1, 1A2, 2A1, 2A2 | A-port data I/Os | Bi-directional signals referenced to VCCA; tolerate input voltages up to 4.2V regardless of VCCA setting. |
| 1B1, 1B2, 2B1, 2B2 | B-port data I/Os | Bi-directional signals referenced to VCCB; tolerate input voltages up to 4.2V regardless of VCCB setting. |
| 1DIR, 2DIR | Direction control inputs | Active-high logic referenced to VCCA; determines data flow direction per transceiver pair (A→B or B→A). |
| 1OE, 2OE | Output-enable inputs | Active-low logic referenced to VCCA; tri-states corresponding A/B port outputs when high. |
| GND | Ground reference | Common return for both power domains; must be low-inductance connection to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 0.65V–3.6V supplies per port enable interoperability between ultra-low-voltage AI accelerators and legacy 3.3V memory or PHYs. |
| VCC isolation | Automatic high-impedance state triggered when either VCCA or VCCB drops below 100mV, eliminating need for external power-fail monitoring circuitry. |
| Glitch-free power sequencing | No bus contention or undefined states during staggered power-up/down of VCCA and VCCB, simplifying system-level power management. |
| Ioff partial-power-down support | Leakage limited to ±8µA per I/O during power-off, allowing safe insertion into live backplanes or hot-pluggable modules. |
| High-speed capability | 380Mbps throughput at 1.8V→3.3V with propagation delay as low as 4ns ensures compatibility with DDR2/3 command/address buses and fast serial links. |
Applications
| Industrial PLC Backplane Interface | Automotive ADAS Sensor Hub |
|---|---|
Use Scenario: Interfacing a 1.2V FPGA-based motion controller with 24V-rated fieldbus transceivers via isolated 3.3V logic domain. IC Role / Device Role / Timing Role: Bidirectional level shifter translating control/status signals between FPGA I/O banks and RS-485 PHY, with independent direction control per signal pair. Use Value: Eliminates discrete resistor-divider networks and reduces BOM count by consolidating four channel translations in one 2.6mm × 1.8mm package. | Use Scenario: Aggregating data from multiple 1.8V image sensors and feeding into a 3.3V MIPI CSI-2 bridge IC inside a camera module. IC Role / Device Role / Timing Role: Four-bit parallel translator synchronizing pixel clock and data lanes across voltage domains while maintaining <10ps skew between channels. Use Value: Enables direct sensor-to-bridge connection without intermediate buffers, reducing latency and board area in compact automotive camera assemblies. |
| 5G Small Cell Baseband Unit | Enterprise SSD Controller Interface |
Use Scenario: Connecting a 0.8V ASIC baseband processor to 1.8V RF front-end components and 3.3V power management ICs in mmWave radio units. IC Role / Device Role / Timing Role: Dual-direction voltage translator managing control bus (I²C/SPI) and status lines between heterogeneous voltage domains with glitch-free sequencing. Use Value: Supports rapid power cycling of RF sections without resetting the baseband processor, improving sleep/wake efficiency in O-RAN compliant radios. | Use Scenario: Bridging a 1.2V NVMe controller to legacy 1.8V NAND flash packages in enterprise-grade solid-state drives. IC Role / Device Role / Timing Role: High-speed bidirectional translator for command/address and status/data lines, operating at 380Mbps to match NAND toggle-mode timing. Use Value: Extends life of proven NAND die by enabling reuse in next-gen low-power controllers without redesigning flash interface logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC4T245RJR | Lower max VCC (3.6V vs. 3.6V), but narrower VCC range (1.2V–3.6V); no VCC isolation; 16-pin WQFN only. | Not suitable for sub-1V systems or brownout-safe designs; lacks Ioff and VCC isolation features. | Select when interfacing only ≥1.2V domains and cost is prioritized over robustness. |
| TXS0104EYZTR | Auto-direction sensing (no DIR pins); lower drive strength; 1.65V–3.6V VCCA/VCCB range; no sub-1V support. | Requires external pull-ups for direction detection; unsuitable for deterministic bidirectional protocols like SPI or parallel buses. | Select only for simple unidirectional or auto-sensed data paths where direction control logic is unavailable. |
Compared with SN74AVC4T245RJR and TXS0104EYZTR, the SN74AXC4T245 uniquely supports sub-0.7V operation, provides hardware-enforced VCC isolation, and delivers guaranteed 380Mbps performance-making it the only choice for next-generation ultra-low-power, fail-safe mixed-voltage interconnects.
Availability
SN74AXC4T245 is available at Aetrix Electronics and suitable for industrial automation, 5G infrastructure, and automotive ADAS applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.
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 solutions, with decades of expertise in precision logic and interface ICs.
The AXC family targets ultra-low-voltage, high-speed bidirectional translation in battery-powered and thermally constrained systems, emphasizing robustness across wide voltage ranges and harsh environmental conditions.
FAQ
What is the minimum operating voltage for SN74AXC4T245 on either port?
The SN74AXC4T245 supports a minimum supply voltage of 0.65V on both VCCA and VCCB rails, enabling direct interface with advanced sub-1V process nodes such as 7nm and 5nm SoCs. This specification is validated across the full –40°C to +125°C temperature range and is not derated at extreme temperatures.
Does SN74AXC4T245 require external pull-up resistors on direction-control pins?
No, SN74AXC4T245 does not require external pull-ups on 1DIR or 2DIR pins. These inputs are CMOS-compatible with VCCA-referenced thresholds and have negligible leakage (±1µA typical). Pull-ups are only recommended on 1OE/2OE pins during power-up to ensure default high-impedance state if control logic is undriven.
Can SN74AXC4T245 translate between 0.8V and 2.5V simultaneously on different channel pairs?
Yes, SN74AXC4T245 supports independent voltage translation per transceiver pair: for example, 1A↔1B can operate at 0.8V↔2.5V while 2A↔2B operates at 1.2V↔3.3V, provided VCCA and VCCB are set accordingly. Each pair's direction and enable are controlled separately, enabling heterogeneous multi-protocol bridging.
How does the VCC isolation feature behave when VCCA = 0.65V and VCCB = 0V?
When VCCB drops below 100mV (e.g., 0V), the VCC isolation feature forces all B-port I/Os (1B1, 1B2, 2B1, 2B2) and A-port I/Os into high-impedance, regardless of VCCA state. This behavior is guaranteed by internal circuitry and requires no external intervention-ensuring bus safety during B-rail power loss.
Is SN74AXC4T245 pin-compatible with earlier SN74LVC4T245 variants?
No, SN74AXC4T245 is not pin-compatible with SN74LVC4T245. While both use 16-pin UQFN (RSV) packaging, the pin assignments differ: SN74AXC4T245 places VCCA on pin 1 and VCCB on pin 2, whereas SN74LVC4T245 assigns VCCA to pin 1 and GND to pin 2. PCB layout reuse is not possible without revision.
SN74AXC4T245RSVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AXC
- Package/Case:
- 16-UFQFN
- 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-UQFN (2.6x1.8)
SN74AXC4T245RSVR FAQ
1.How can I place an order for SN74AXC4T245RSVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AXC4T245RSVR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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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 SN74AXC4T245RSVR?
For technical support, including SN74AXC4T245RSVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AXC4T245RSVR requirements.
6.How does Aetrix verify that SN74AXC4T245RSVR is sourced from the original manufacturer or authorized distributors?
All SN74AXC4T245RSVR 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 SN74AXC4T245RSVR meets industry standards.
7.What is the process for return or replacement of SN74AXC4T245RSVR?
All SN74AXC4T245RSVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AXC4T245RSVR, 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 SN74AXC4T245RSVR part is unused and in its original packaging.
Return procedure for SN74AXC4T245RSVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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