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Texas Instruments SN74AVC2T245RSWR
- Part No.:
- SN74AVC2T245RSWR
- Manufacturer:
- Texas Instruments
- Package:
- 10-UFQFN
- Datasheet:
-
SN74AVC2T245RSWR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 10UQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74AVC2T245 from Texas Instruments is a dual-bit, dual-supply noninverting bus transceiver enabling bidirectional voltage translation between independent 1.2V–3.6V domains (VCCA and VCCB), with independent DIR1/DIR2 control per channel, tri-state outputs via OE referenced to VCCA, and 4.6V I/O tolerance - deployed in low-voltage interconnects between processors and peripherals such as UART, I²C, and GPIO banks.
For engineers reviewing the SN74AVC2T245 datasheet, SN74AVC2T245 pinout, SN74AVC2T245 application, or SN74AVC2T245 equivalent, key selection criteria include dual-rail configurability, partial-power-down support (Ioff), VCC isolation behavior, 500Mbps max data rate (1.8V→3.3V), and UQFN-10 package compatibility with high-density PCB layouts.
Technical Context
The SN74AVC2T245 implements fully asynchronous bidirectional level shifting using two independent supply rails: A-port logic levels track VCCA (1.2V–3.6V), B-port levels track VCCB (1.2V–3.6V), and all control inputs (DIR1, DIR2, OE) are referenced to VCCA. Each transceiver channel operates independently under its own DIR signal.
Functional modes are defined by OE and DIR states: OE = L enables translation (A↔B depending on DIR), OE = H forces both ports into high-impedance; VCC isolation ensures high-Z when either VCCA or VCCB = GND; Ioff limits backflow current during partial power-down. Propagation delays range from 1.7ns to 4.4ns depending on VCCA/VCCB combinations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.2V to 3.6V each - enables translation across 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains without external biasing |
| Max Data Rate | 500Mbps (1.8V→3.3V) - supports high-speed interface bridging in portable and embedded systems |
| I/O Voltage Tolerance | 4.6V - allows safe interfacing with higher-voltage legacy signals while powered from low-voltage rails |
| Ioff Current | ±5μA max - prevents damaging backflow current when one rail is unpowered, critical for hot-swap and power-gating designs |
| VCC Isolation | Active when either VCCA or VCCB = GND - guarantees both ports enter high-Z, avoiding bus contention during power sequencing |
| ESD Rating (HBM) | 5000V - exceeds JEDEC JESD22-A114A, supporting robust handling in manufacturing and field environments |
| Propagation Delay (tPLH/tPHL) | 1.7ns–4.4ns - varies with VCCA/VCCB pairing; e.g., 1.9ns typical at 1.8V→1.8V, 2.4ns at 3.3V→1.2V |
Pinout & Package
SN74AVC2T245 is packaged in a 10-pin UQFN (RSW) with 1.80mm × 1.40mm body size and 0.4mm pitch, optimized for space-constrained applications requiring thermal efficiency and low parasitic inductance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 7) | Supply for A-port logic and control inputs | Powers A1/A2 I/Os and references DIR1/DIR2/OE thresholds; must be stable before enabling operation |
| VCCB (Pin 6) | Supply for B-port logic | Powers B1/B2 I/Os; independent of VCCA - enables true dual-rail translation |
| GND (Pin 3) | Common reference | Single ground connection shared by both domains; layout requires low-inductance return path |
| A1, A2 (Pins 8, 9) | Bidirectional A-port data lines | Direction determined by DIR1/DIR2; output voltage swing follows VCCA; tolerate up to 4.6V |
| B1, B2 (Pins 5, 4) | Bidirectional B-port data lines | Direction determined by DIR1/DIR2; output voltage swing follows VCCB; tolerate up to 4.6V |
| DIR1, DIR2 (Pins 10, 1) | Per-channel direction control | Referenced to VCCA; DIR = H enables A→B flow, DIR = L enables B→A flow |
| OE (Pin 2) | Global output enable | Referenced to VCCA; OE = H forces all outputs (A1/A2/B1/B2) into high-impedance state |
Key Features
| Feature | Design Value |
|---|---|
| Independent per-channel direction control | DIR1 and DIR2 allow simultaneous A→B and B→A data flow on separate bit lanes - essential for full-duplex protocols like UART or dual-lane GPIO |
| 4.6V I/O tolerance on all ports | Enables safe connection to 5V-tolerant systems or legacy interfaces without external clamping diodes or resistors |
| VCC isolation with automatic high-Z | Guarantees bus isolation if either VCCA or VCCB collapses to GND - eliminates risk of cross-rail leakage or false logic assertion |
| Partial-power-down support (Ioff) | Restricts off-state current to ±5μA max - permits selective powering of subsystems while maintaining signal integrity on active buses |
| Configurable 1.2V–3.6V dual-rail operation | Eliminates need for discrete level shifters in mixed-voltage SoC designs, reducing BOM count and PCB area |
Applications
| Processor-to-Peripheral Interfacing | Multi-Voltage GPIO Expansion |
|---|---|
Use Scenario: Connecting a 1.8V application processor's UART TX/RX to a 3.3V sensor module. IC Role / Device Role / Timing Role: Bidirectional level translator managing real-time serial data flow with sub-5ns propagation delay and no clock dependency. Use Value: Enables direct interoperability without external voltage dividers or active buffers, preserving signal integrity at 3Mbps+ UART rates. |
Use Scenario: Expanding GPIO count on a 1.2V FPGA bank to drive 2.5V industrial I/O modules. IC Role / Device Role / Timing Role: Dual-bit translator providing isolated, direction-controlled signal routing between mismatched voltage domains. Use Value: Supports hot-plug-safe expansion with Ioff and VCC isolation, preventing damage during live insertion or power sequencing faults. |
| Low-Power Wearable Subsystem Bridging | Automotive Body Control Module Interface |
Use Scenario: Linking a 1.5V microcontroller's I²C bus to a 3.3V display driver in battery-powered wearables. IC Role / Device Role / Timing Role: Voltage translator operating in partial-power-down mode during sleep cycles, with OE-controlled shutdown. Use Value: Reduces quiescent current to <16μA total (ICCA + ICCB), extending battery life without sacrificing wake-up responsiveness. |
Use Scenario: Isolating a 3.3V infotainment MCU from 1.8V CAN transceiver logic in an automotive body control unit. IC Role / Device Role / Timing Role: Level-shifting interface with VCC isolation ensuring CAN bus remains undisturbed during MCU reset or brownout. Use Value: Prevents bus lockup or spurious frame transmission during power transitions - meets ASIL-B functional safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-bit bidirectional level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXS0102DCUR | Auto-direction sensing (no DIR pins); lower drive strength (±8mA vs ±12mA); 1.65V–3.6V VCCA/VCCB range only | Best for push-pull buses with inherent direction signaling (e.g., I²C); unsuitable where explicit DIR control is required | Select SN74AVC2T245 when deterministic direction control, wider voltage range (1.2V–3.6V), or higher drive capability is needed |
| SN74LVC2T45DCUR | Same pinout and function but lacks Ioff and VCC isolation; max VCC = 3.6V, no 4.6V I/O tolerance | Lower cost alternative where partial-power-down and rail collapse immunity are not required | Choose SN74AVC2T245 for systems requiring robustness during power sequencing, hot-swap, or mixed 5V/3.3V legacy integration |
Compared with TXS0102DCUR and SN74LVC2T45DCUR, the SN74AVC2T245 uniquely delivers guaranteed VCC isolation, 4.6V I/O tolerance, and full 1.2V–3.6V dual-rail support - making it the only option among the three qualified for safety-critical power-gated subsystems and 5V-tolerant edge interfaces.
Availability
SN74AVC2T245 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and portable consumer device designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for production ramp.
Supply support for SN74AVC2T245 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 company specializing in analog and embedded processing technologies, with leadership in interface, power management, and signal chain solutions.
The SN74AVC2T245 belongs to TI's AVC (Advanced Very-Low-Voltage CMOS) logic family, engineered specifically for ultra-low-voltage bidirectional level translation in space- and power-constrained portable, industrial, and automotive systems.
FAQ
What voltage ranges does the SN74AVC2T245 support on its A and B ports?
The SN74AVC2T245 supports independent 1.2V to 3.6V operation on both VCCA (A port) and VCCB (B port), enabling translation between any combination of 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains. This full-range flexibility is confirmed in Section 5.3 (Recommended Operating Conditions) of the official TI datasheet SCES692E.
How does the VCC isolation feature work in the SN74AVC2T245?
The SN74AVC2T245 activates VCC isolation when either VCCA or VCCB is driven to GND: both A and B ports immediately enter high-impedance state, preventing bus contention or false logic assertion. This behavior is explicitly documented in Section 7.3.3 and Table 7-1 of the SN74AVC2T245 datasheet.
Can the SN74AVC2T245 be used in partial-power-down applications?
Yes - the SN74AVC2T245 is fully specified for partial-power-down operation via its Ioff feature, which limits off-state current to ±5μA maximum when either VCCA or VCCB is unpowered. This capability is validated per JESD78 Class II latch-up testing and detailed in Sections 1, 7.3.2, and 5.5 of the datasheet.
What is the maximum data rate supported by the SN74AVC2T245?
The SN74AVC2T245 achieves up to 500Mbps when translating from 1.8V to 3.3V, with lower but still high rates for other combinations (e.g., 320Mbps for <1.8V→3.3V, 240Mbps for 1.2V translation). These values are measured typical performance figures published in Section 1 of the SN74AVC2T245 datasheet.
Does the SN74AVC2T245 require external pull-up resistors on its control pins?
Yes - to ensure reliable high-impedance state during power-up/power-down, OE must be connected to VCCA through a pull-up resistor. The minimum value depends on the driver's current-sinking capability and is specified in Section 3 (Description) of the SN74AVC2T245 datasheet; typical values range from 4.7kΩ to 10kΩ.
Is the SN74AVC2T245 pin-compatible with other dual-bit translators like the SN74LVC2T45?
Yes - the SN74AVC2T245 shares identical UQFN-10 (RSW) pinout and footprint with SN74LVC2T45 and SN74AXC2T45, enabling drop-in replacement in existing layouts. However, SN74AVC2T245 adds Ioff, VCC isolation, and 4.6V I/O tolerance not present in the LVC variant.
SN74AVC2T245RSWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVC
- Package/Case:
- 10-UFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Translation Transceiver
- Number of Elements:
- 1
- Number of Bits per Element:
- 2
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 12mA, 12mA
- Voltage - Supply:
- 1.2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-UQFN (1.8x1.4)
SN74AVC2T245RSWR FAQ
1.How can I place an order for SN74AVC2T245RSWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVC2T245RSWR 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 SN74AVC2T245RSWR reliable?
The price and inventory of SN74AVC2T245RSWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVC2T245RSWR is usually 5 days.
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Once your SN74AVC2T245RSWR 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 SN74AVC2T245RSWR?
For technical support, including SN74AVC2T245RSWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVC2T245RSWR requirements.
6.How does Aetrix verify that SN74AVC2T245RSWR is sourced from the original manufacturer or authorized distributors?
All SN74AVC2T245RSWR 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 SN74AVC2T245RSWR meets industry standards.
7.What is the process for return or replacement of SN74AVC2T245RSWR?
All SN74AVC2T245RSWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVC2T245RSWR, 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 SN74AVC2T245RSWR part is unused and in its original packaging.
Return procedure for SN74AVC2T245RSWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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